WO2013114491A1 - Antenna device and portable wireless device - Google Patents

Antenna device and portable wireless device Download PDF

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Publication number
WO2013114491A1
WO2013114491A1 PCT/JP2012/007027 JP2012007027W WO2013114491A1 WO 2013114491 A1 WO2013114491 A1 WO 2013114491A1 JP 2012007027 W JP2012007027 W JP 2012007027W WO 2013114491 A1 WO2013114491 A1 WO 2013114491A1
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WO
WIPO (PCT)
Prior art keywords
antenna
reader
writer
loop
opening area
Prior art date
Application number
PCT/JP2012/007027
Other languages
French (fr)
Japanese (ja)
Inventor
健司 柳
石森　貴之
智 針谷
Original Assignee
パナソニック株式会社
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by パナソニック株式会社 filed Critical パナソニック株式会社
Publication of WO2013114491A1 publication Critical patent/WO2013114491A1/en

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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q1/00—Details of, or arrangements associated with, antennas
    • H01Q1/12—Supports; Mounting means
    • H01Q1/22—Supports; Mounting means by structural association with other equipment or articles
    • H01Q1/2208—Supports; Mounting means by structural association with other equipment or articles associated with components used in interrogation type services, i.e. in systems for information exchange between an interrogator/reader and a tag/transponder, e.g. in Radio Frequency Identification [RFID] systems
    • H01Q1/2225—Supports; Mounting means by structural association with other equipment or articles associated with components used in interrogation type services, i.e. in systems for information exchange between an interrogator/reader and a tag/transponder, e.g. in Radio Frequency Identification [RFID] systems used in active tags, i.e. provided with its own power source or in passive tags, i.e. deriving power from RF signal
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06K—GRAPHICAL DATA READING; PRESENTATION OF DATA; RECORD CARRIERS; HANDLING RECORD CARRIERS
    • G06K19/00—Record carriers for use with machines and with at least a part designed to carry digital markings
    • G06K19/06—Record carriers for use with machines and with at least a part designed to carry digital markings characterised by the kind of the digital marking, e.g. shape, nature, code
    • G06K19/067—Record carriers with conductive marks, printed circuits or semiconductor circuit elements, e.g. credit or identity cards also with resonating or responding marks without active components
    • G06K19/07—Record carriers with conductive marks, printed circuits or semiconductor circuit elements, e.g. credit or identity cards also with resonating or responding marks without active components with integrated circuit chips
    • G06K19/077—Constructional details, e.g. mounting of circuits in the carrier
    • G06K19/07749—Constructional details, e.g. mounting of circuits in the carrier the record carrier being capable of non-contact communication, e.g. constructional details of the antenna of a non-contact smart card
    • G06K19/07773—Antenna details
    • G06K19/07777—Antenna details the antenna being of the inductive type
    • G06K19/07779—Antenna details the antenna being of the inductive type the inductive antenna being a coil
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q21/00—Antenna arrays or systems
    • H01Q21/29—Combinations of different interacting antenna units for giving a desired directional characteristic
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q7/00—Loop antennas with a substantially uniform current distribution around the loop and having a directional radiation pattern in a plane perpendicular to the plane of the loop

Definitions

  • the present invention relates to an antenna device and a portable wireless device used for communication with an antenna of a counter device that is a communication partner.
  • FIG. 5A is a diagram showing a positional relationship between an antenna 130 mounted on a conventional mobile device and an antenna 160 mounted on a reader / writer facing the antenna 130.
  • FIG. 5B is an explanatory diagram when a conventional mobile device and a reader / writer are close to each other.
  • FIG. 5C is an explanatory diagram when the conventional mobile device and the reader / writer are separated from each other. 5 to 7, the conventional mobile device is simply referred to as “mobile device”.
  • the antenna 130 mounted on the mobile device is arranged on the rear side of the mobile device housing.
  • An antenna 160 mounted on a reader / writer serving as a communication partner of the mobile device is disposed on the surface of the reader / writer housing.
  • the antenna 130 mounted on the mobile device is more stable than the antenna 160 mounted on the reader / writer, whether it is an antenna having a large opening area or an antenna having a small opening area. It is necessary to ensure the communication performance.
  • the antenna 130 mounted on the mobile device needs to be able to perform stable communication even if the distance from the antenna 160 mounted on the reader / writer is short.
  • the antenna 130 mounted on the mobile device needs to secure a communication distance with respect to the antenna 160 mounted on the reader / writer.
  • Patent Document 2 an antenna device in which a plurality of antenna elements corresponding to each frequency band is formed when performing communication in different frequency bands is known (see, for example, Patent Document 2).
  • Japanese Unexamined Patent Publication No. 2004-213582 Japanese Unexamined Patent Publication No. 2010-213195 Japanese Unexamined Patent Publication No. 2009-153023
  • the conventional antenna device has the following problems.
  • a reader / writer opposed to a portable wireless device that is a mobile device has a loop antenna of various shapes such as a large loop antenna having a large opening area and a small loop antenna.
  • a loop antenna of various shapes such as a large loop antenna having a large opening area and a small loop antenna.
  • Exists In order to realize stable communication between the portable wireless device and each reader / writer, it is necessary to eliminate the communication impossible area (see the dotted line frame p in FIG. 4) while securing the communication distance.
  • the antenna device has the following problems.
  • FIG. 6A is a diagram showing a positional relationship between the antenna 130 mounted on the mobile device and the antenna 160 mounted on the reader / writer facing the mobile device when the opening areas of the antenna units are different.
  • FIG. 6B is an explanatory diagram when the mobile device having a small opening area and the reader / writer are separated from each other.
  • FIG. 6C is a diagram showing a positional relationship between the antenna 130 mounted on the mobile device and the antenna 160 mounted on the reader / writer facing the antenna 130 when the opening areas of the antenna units are different.
  • an antenna 130 mounted on a mobile device having an antenna portion 130a having a small opening area and an antenna 160 mounted on a reader / writer having an antenna portion 160a having a large opening area.
  • the communication is not stable.
  • Communication the electromagnetic coupling between the antenna portions 130a and 160a forming the loop antenna is weak, and communication is not stable.
  • FIG. 7A is a diagram illustrating a positional relationship between antennas having a large opening area of an antenna unit and an antenna 160 mounted on a reader / writer facing the antenna 130 mounted on the mobile device.
  • FIG. 7B is a diagram showing a positional relationship when the longitudinal directions of the antenna 130 mounted on the mobile device and the antenna 160 mounted on the reader / writer facing the antenna 130 are vertical.
  • FIG. 7C is a top view of the antenna 130 mounted on the mobile device and the antenna 160 mounted on the reader / writer.
  • Patent Document 3 since the signal for each function is detected and the antenna condition is switched using a switch, it is difficult to switch the antenna condition when using the same function.
  • the present invention has been made to solve the above-described conventional problems, and provides an external communication device having loop antennas of various shapes with a single antenna, and an antenna device and a portable wireless device that ensure stable communication performance.
  • the purpose is to do.
  • the present invention is an antenna device, comprising: a first antenna having a large opening area; and a second antenna having a smaller opening area than the first antenna, wherein the first antenna and the second antenna Are connected as one antenna.
  • This configuration can ensure stable communication performance with an external communication device having loop antennas of various shapes with one antenna.
  • the first antenna and the second antenna are connected as one antenna, it is possible to ensure stable communication performance with an external communication device having loop antennas of various shapes with one antenna. Can do. Further, since the antenna has only two contact points and can be formed with a single-sided substrate, it can be reduced in size and thickness. Furthermore, unnecessary parts can be reduced without adding circuit parts such as switches.
  • the figure which shows the structure of the RFID system containing the portable information terminal in this embodiment (A) A plan view showing the shape of the loop antenna mounted on the portable information terminal, (B) a perspective view showing the shape of the loop antenna mounted on the portable information terminal, and (C) the loop antenna mounted on the reader / writer.
  • Plan view showing shape The figure which shows the positional relationship of the antenna mounted in the reader / writer facing the antenna mounted in the portable information terminal, (A) An explanatory diagram when the distance between the portable information terminal and the reader / writer is long, (B) Mobile information Explanatory drawing when the distance between the terminal and reader / writer is short A graph showing a distance between an antenna mounted on a portable information terminal and an antenna mounted on a reader / writer, and a change in received voltage at the antenna mounted on the portable information terminal (A) The figure which shows the positional relationship with the antenna mounted in the reader / writer facing the antenna mounted in the conventional mobile device, (B) The explanatory view when the conventional mobile device and the reader / writer are close, (C) Explanatory drawing when the conventional mobile device and the reader / writer are separated (A) The figure which shows the positional relationship with the antenna mounted in the reader / writer facing the antenna mounted in the mobile device in case the opening area of an antenna part differs, (B) Each mobile device with a small opening area Explanatory drawing when
  • the antenna device of this embodiment is mounted on a portable information terminal as a portable wireless device (mobile device) in an RFID system.
  • FIG. 1 is a diagram showing a configuration of an RFID system 1 including a portable information terminal 10 in the present embodiment.
  • the RFID system 1 includes a portable information terminal 10 as a portable radio device and a reader / writer 50 as an external communication device.
  • the portable information terminal 10 includes an RFID antenna unit 11, an RFID radio unit 12, an RFID control unit 13, a memory 14, an interface (IF) unit 15, a central control unit 16, an information storage unit 17, a display unit 18, an input unit 19, and a radio.
  • the configuration includes the communication unit 20.
  • the RFID antenna unit 11 includes a loop antenna 31 which is an antenna element and a resonance circuit capacitor 32, and performs data communication (transmission / reception) with the reader / writer 50 in a non-contact manner.
  • the RFID wireless unit 12 performs processing related to transmission / reception of analog signals transmitted / received to / from the reader / writer 50 via the loop antenna 31 such as detection, modulation / demodulation, clock extraction, and the like.
  • the RFID control unit 13 processes data transmitted to and received from the reader / writer 50 and controls the operation of the RFID wireless unit 12 in an integrated manner.
  • the RFID control unit 13 is connected to a memory 14 that stores information related to RFID.
  • the memory 14 is configured using, for example, a flash memory, and stores various data transmitted to and received from the reader / writer 50.
  • the interface unit 15 is a functional module for connecting the RFID control unit 13 to the central control unit 16, the information storage unit 17, the display unit 18, the input unit 19, and the wireless communication unit 20. Data written in the memory 14 is transferred to the central control unit 16, the information storage unit 17, the display unit 18, the input unit 19, and the wireless communication unit 20 via the interface unit 15.
  • the central control unit 16 is configured using a CPU (Central Processing Unit), a ROM (Read Only Memory), a RAM (Random Access Memory), and the like, and the CPU executes various programs stored in the ROM, so that the portable information Various processes related to the operation of the terminal 10 are performed.
  • an information storage unit 17 Connected to the central control unit 16 is an information storage unit 17 that stores various types of information such as applications and content data that can be used in the portable information terminal 10.
  • the display unit 18 is configured using an LCD (Liquid Crystal Display) or the like, and outputs an RFID function state, various processing results, content data reproduction results, and the like to the LCD screen.
  • LCD Liquid Crystal Display
  • the input unit 19 is configured by using a button, a numeric keypad, a switch, a jog dial, a touch panel arranged on the LCD screen, and the like, and accepts an operation instruction to the portable information terminal 10 or a user operation of data input.
  • the wireless communication unit 20 has a wireless communication function for performing wireless communication with an external base station (not shown) via the antenna 21. These units are driven by being supplied with power from a battery (not shown).
  • the reader / writer 50 includes an RFID antenna unit 51, an RFID radio unit 52, a control unit 53, a memory 54, and an interface (IF) unit 55.
  • the RFID antenna unit 51 includes a loop antenna 61 that is an antenna element and a resonance circuit capacitor 62, and performs data communication (transmission / reception) with the portable information terminal 10 in a non-contact manner.
  • the RFID radio unit 52 performs processing related to transmission / reception of analog signals transmitted / received to / from the portable information terminal 10 via the loop antenna 61, such as detection, modulation / demodulation, clock extraction, and the like.
  • the control unit 53 processes data transmitted to and received from the portable information terminal 10 and controls the operation of the RFID wireless unit 52 in an integrated manner.
  • the control unit 53 is connected to a memory 54 that stores information related to RFID.
  • the memory 54 is configured using, for example, a flash memory, and stores various data transmitted to and received from the portable information terminal 10, for example, identification information of the portable information terminal 10, reading error information, and the like.
  • the interface unit 55 connects the reader / writer 50 to a data processing device (not shown) in the rear stage (left arrow side) of FIG. 1, and for example, processes data transmitted / received to / from the portable information terminal 10. Output to the device.
  • FIG. 2A is a plan view showing the shape of the loop antenna 31 mounted on the portable information terminal 10, and shows the shape of the loop antenna 31 mounted on the portable information terminal 10 formed on the substrate 42.
  • the substrate 42 is made of a material such as FPC (Flexible Printed Circuits) or FR-4.
  • the loop antenna 31 includes an antenna portion 31a having a large opening area that is wound a plurality of times along the peripheral edge of the substrate 42, an antenna portion 31b having a small opening area that is wound a plurality of times at a substantially central portion of the substrate 42, and a jumper wire 31c. It is a double loop antenna consisting of Here, the antenna units 31a and 31b are wound so as to have an arbitrary number of wires (for example, two wires). Moreover, the antenna part 31b is formed inside the antenna part 31a.
  • Both end portions of the loop antenna 31 are connected to a hot-side contact 31d (first contact) and a GND-side contact 31e (second contact) formed on the substrate 42, respectively.
  • the loop antenna 31 is integrated with a wiring pattern like a one-stroke drawing.
  • the loop antenna 31 shown in FIG. 2A is an example in which the jumper wire 31c is used to align the contact point 31e with the contact point 31d.
  • the contact point 31e is disposed inside the loop of the loop antenna 31 so that the jumper wire 31c is unnecessary. May be.
  • the shape of the loop antenna 31 is a rectangle represented by the ratio of dimensions a, b, and c in FIG. 2A, but other ratios of rectangle, circle, and other shapes are used. It may be comprised using, and it is not limited to the shape shown to FIG.
  • FIG. 2 (B) is a perspective view schematically showing the shape of the loop antenna 31 formed as the double loop antenna shown in FIG. 2 (A) for easy understanding.
  • the shape of the loop antenna schematically shown in FIG. 2B is used.
  • FIG. 2C is a plan view showing the shape of the loop antenna 61 mounted on the reader / writer 50.
  • the loop antenna 61 includes an antenna portion 61a wound along the peripheral edge of the substrate 65, and contacts 61b and 61c to which both ends of the antenna portion 61a are connected.
  • the surface of the substrate 42 on which the loop antenna 31 is formed is disposed on the back side of the casing of the portable information terminal 10.
  • the surface of the substrate 65 on which the loop antenna 61 is formed is disposed on the surface side of the housing of the reader / writer 50.
  • FIG. 3 is a diagram showing a positional relationship between the loop antenna 31 mounted on the portable information terminal 10 and the loop antenna 61 mounted on the reader / writer 50 facing the loop antenna 31.
  • FIG. 3A is an explanatory diagram when the distance between the portable information terminal 10 and the reader / writer 50 is long.
  • FIG. 3B is an explanatory diagram when the distance between the portable information terminal 10 and the reader / writer 50 is short.
  • the loop antenna 31 has an opening area that is almost the same size as the opening areas of the antenna portions 61a and 61f mounted on the reader / writer 50.
  • Wireless communication with the reader / writer 50 is performed using the units 31a and 31b.
  • the loop antenna 31 uses the antenna unit 31a having an opening area substantially the same as the opening area of the antenna unit 61a. Wireless communication with the reader / writer 50. Furthermore, when the opening area of the antenna portion 61f mounted on the reader / writer 50 is small, the loop antenna 31 uses the antenna portion 31b having an opening area approximately the same as the opening area of the antenna portion 61f. 50 to communicate wirelessly.
  • the loop antenna 31 has an opening area that is substantially the same as the opening area of the antenna portions 61a and 61f mounted on the reader / writer 50.
  • the reader / writer 50 is wirelessly communicated using the antenna units 31a and 31b having the.
  • the loop antenna 31 uses the antenna unit 31a having an opening area substantially the same as the opening area of the antenna unit 61a. Wireless communication with the reader / writer 50. Further, when the antenna 61f mounted on the reader / writer 50 has a small opening area, the loop antenna 31 uses the antenna unit 31b having an opening area substantially the same as the opening area of the antenna 61f. 50 to communicate wirelessly.
  • stable communication can be performed between the antenna portions 31a and 61a having a large opening area.
  • stable communication can be performed between the antenna portions 31b and 61f having a small opening area.
  • FIG. 4 is a graph showing the distance between the loop antenna 31 mounted on the portable information terminal 10 and the loop antenna 61 mounted on the reader / writer 50 and the change in received voltage at the loop antenna 31 mounted on the portable information terminal 10. .
  • the horizontal axis in FIG. 4 indicates the distance between the loop antenna 31 mounted on the portable information terminal 10 and the loop antenna 61 mounted on the reader / writer 50.
  • the vertical axis in FIG. 4 indicates the magnitude of the reception voltage of the loop antenna 31.
  • the received voltage of the loop antenna 31 decreases continuously and gradually as the distance increases.
  • the conventional loop antenna as shown by the symbol n, there is an incommunicable region (dotted line frame p) in which the reception voltage decreases midway, and the reception voltage of this conventional loop antenna is It changes discontinuously.
  • the RFID system 1 of this embodiment it is possible to ensure stable communication performance with a reader / writer having loop antennas of various shapes with one antenna. Further, by arranging the antenna portion having a small opening area inside the antenna portion having a large opening area, the area of the antenna portion can be reduced. In addition, since only two contact points between the antenna and the substrate are required, the antenna device and the portable wireless device are suitable for miniaturization. In addition, since the antenna device can be formed using a single-sided substrate, the thickness can be reduced. Furthermore, unnecessary parts can be reduced without adding circuit parts such as switches.
  • the antenna portion 31a of the portable information terminal 10 is wound along the peripheral portion of the substrate 42, and the antenna portion 31b is wound around the substantially central portion of the substrate 42, various shapes mounted on the reader / writer 50 are provided. It can correspond to the loop antenna of.
  • the antenna units 31a and 31b of the portable information terminal 10 are wound a plurality of times so as to have an arbitrary number of wires (here, two wires), electromagnetic coupling with the antenna units 61a and 61f of the reader / writer 50 is performed. Can be strengthened.
  • one side of the substrate 42 on which the loop antenna 31 is formed is disposed on the back side of the casing of the portable information terminal 10.
  • the portable information terminal 10 can communicate with the reader / writer 50 with strong electromagnetic coupling.
  • the loop antenna wound a plurality of times so that each of the antenna portions 31a and 31b has an arbitrary number of wires is shown.
  • it may be a loop antenna (helical antenna) wound a plurality of times so as to have an arbitrary number of lines separated by a predetermined pitch.
  • the double loop antenna including the first loop antenna and the second loop antenna is mounted on the portable information terminal 10 side.
  • the double loop antenna is mounted on the reader / writer side or both. May be.
  • substrate as one antenna.
  • three or more antennas may be connected as one antenna.
  • a first antenna, a second antenna, and a third antenna may be provided at a position (concentric position) spreading in a ring shape from the center of the substrate, and these may be connected to form one antenna.
  • two antenna parts (second and third antennas) wound adjacent to each other are provided inside the antenna part (first antenna) wound along the peripheral edge of the substrate, and these are connected. And it is good also as one antenna.
  • the antenna is formed by providing the wiring pattern on the single-sided board, but a multilayer board may be used. Furthermore, a loop antenna may be formed with a wire without using a substrate. Moreover, you may form an antenna with the material which has electroconductivity other than a wire.
  • the portable wireless device is mounted on a portable information terminal.
  • the portable wireless device can be mounted on various devices such as an electronic tag.
  • the present invention is an antenna device used for communication with an opposing antenna, and is useful as an antenna device and a portable wireless device that ensure stable communication performance with an external communication device having loop antennas of various shapes with one antenna. is there.

Abstract

A loop antenna (31) comprises a large aperture antenna section (31a) wound along the periphery of a substrate (42), a small aperture antenna section (31b) wound in the center of the substrate (42), and a jumper wire (31c). The large aperture antenna section (31a) is used to carry out stable communication with a loop antenna (61) mounted in a reader-writer and having a large aperture antenna section (61a). The small aperture antenna section (31b) is used to carry out stable communication with a loop antenna (61) mounted in a reader-writer and having a small aperture antenna section (61f).

Description

アンテナ装置及び携帯無線機Antenna device and portable radio
　本発明は、通信相手となる対向機のアンテナとの通信に用いられるアンテナ装置及び携帯無線機に関する。 The present invention relates to an antenna device and a portable wireless device used for communication with an antenna of a counter device that is a communication partner.
　現在、ＲＦＩＤ（Radio Frequency Identification）用のアンテナには、多くの形状を有するものが市場に出回っており、それぞれにおいて安定した通信性能が求められる。特に、移動機にＦｅｌｉＣａ（登録商標）機能を搭載するためには、通信相手となる規定の対向リーダライタ（ＲＷ）、規定の通信距離及び通信性能を確保する必要がある。 Currently, there are many antennas for RFID (Radio Frequency Identification) on the market, and each requires stable communication performance. In particular, in order to mount the FeliCa (registered trademark) function in a mobile device, it is necessary to ensure a specified counter reader / writer (RW) as a communication partner, a specified communication distance, and communication performance.
　図５（Ａ）は従来の移動機に搭載されているアンテナ１３０と対向するリーダライタに搭載されているアンテナ１６０との位置関係を示す図である。図５（Ｂ）は、従来の移動機とリーダライタとが近い場合の説明図である。図５（Ｃ）は、従来の移動機とリーダライタとが離れている場合の説明図である。なお、図５～図７の説明において、従来の移動機を、単に「移動機」という。一般的に、移動機に搭載されているアンテナ１３０は、移動機の筐体背面側に配置される。移動機の通信相手となるリーダライタに搭載されているアンテナ１６０は、リーダライタの筐体表面側に配置される。 FIG. 5A is a diagram showing a positional relationship between an antenna 130 mounted on a conventional mobile device and an antenna 160 mounted on a reader / writer facing the antenna 130. FIG. 5B is an explanatory diagram when a conventional mobile device and a reader / writer are close to each other. FIG. 5C is an explanatory diagram when the conventional mobile device and the reader / writer are separated from each other. 5 to 7, the conventional mobile device is simply referred to as “mobile device”. In general, the antenna 130 mounted on the mobile device is arranged on the rear side of the mobile device housing. An antenna 160 mounted on a reader / writer serving as a communication partner of the mobile device is disposed on the surface of the reader / writer housing.
　図５（Ａ）に示すように、移動機に搭載されているアンテナ１３０は、リーダライタに搭載されているアンテナ１６０に対し、開口面積の大きいアンテナ又は開口面積の小さいアンテナのいずれにおいても、安定した通信性能を確保する必要がある。 As shown in FIG. 5A, the antenna 130 mounted on the mobile device is more stable than the antenna 160 mounted on the reader / writer, whether it is an antenna having a large opening area or an antenna having a small opening area. It is necessary to ensure the communication performance.
　また、図５（Ｂ）に示すように、移動機に搭載されているアンテナ１３０は、リーダライタに搭載されているアンテナ１６０との距離が近くても安定した通信を行える必要がある。 Further, as shown in FIG. 5B, the antenna 130 mounted on the mobile device needs to be able to perform stable communication even if the distance from the antenna 160 mounted on the reader / writer is short.
　更に、図５（Ｃ）に示すように、移動機に搭載されているアンテナ１３０は、リーダライタに搭載されているアンテナ１６０に対し、通信距離を確保する必要がある。 Furthermore, as shown in FIG. 5C, the antenna 130 mounted on the mobile device needs to secure a communication distance with respect to the antenna 160 mounted on the reader / writer.
　この種の先行技術として、異なる通信規格のＩＣ（近傍型と近接型）に対し、それぞれアンテナ素子を接続する際、１つのタグの中に、複数のＩＣとそれぞれに対応した複数のアンテナ素子を形成するＲＦＩＤシステムが知られている（例えば、特許文献１参照）。 As a prior art of this type, when connecting antenna elements to ICs of different communication standards (neighboring type and proximity type), a plurality of antenna elements corresponding to each of a plurality of ICs are provided in one tag. An RFID system to be formed is known (see, for example, Patent Document 1).
　また、異なる周波数帯域で通信を行う際、各周波数帯域に対応した複数のアンテナ素子が形成されたアンテナ装置が知られている（例えば、特許文献２参照）。 Also, an antenna device in which a plurality of antenna elements corresponding to each frequency band is formed when performing communication in different frequency bands is known (see, for example, Patent Document 2).
　また、異なる機能（カード機能とリーダライタ機能）を有するＲＦＩＤシステムに用いられ、１つのアンテナに中間タップ及びスイッチを設け、それぞれの機能に対してアンテナを最適化するアンテナ装置が知られている（例えば、特許文献３参照）。 Further, there is known an antenna device that is used in an RFID system having different functions (card function and reader / writer function), and that is provided with an intermediate tap and a switch for one antenna and optimizes the antenna for each function ( For example, see Patent Document 3).
日本国特開２００４－２１３５８２号公報Japanese Unexamined Patent Publication No. 2004-213582 日本国特開２０１０－２１３１９５号公報Japanese Unexamined Patent Publication No. 2010-213195 日本国特開２００９－１５３０２３号公報Japanese Unexamined Patent Publication No. 2009-153023
　しかしながら、上記従来のアンテナ装置には、次のような問題があった。ＲＦＩＤシステムでは、移動機である携帯無線機と対向するリーダライタとにおいては、開口面積の大きい大型のループアンテナを有するもの、小型のループアンテナを有するもの等、さまざまな形状のループアンテナを有するものが存在する。携帯無線機と各リーダライタとの間で安定した通信を実現させるためには、通信距離を確保しながら、通信不可領域（図４の点線枠ｐ参照）を無くす必要があるが、上記従来のアンテナ装置には次のような問題があった。 However, the conventional antenna device has the following problems. In an RFID system, a reader / writer opposed to a portable wireless device that is a mobile device has a loop antenna of various shapes such as a large loop antenna having a large opening area and a small loop antenna. Exists. In order to realize stable communication between the portable wireless device and each reader / writer, it is necessary to eliminate the communication impossible area (see the dotted line frame p in FIG. 4) while securing the communication distance. The antenna device has the following problems.
　図６（Ａ）は、アンテナ部の開口面積が異なる場合の移動機に搭載されているアンテナ１３０と対向するリーダライタに搭載されているアンテナ１６０との位置関係を示す図である。図６（Ｂ）は、それぞれ開口面積の小さい移動機とリーダライタとが離れている場合の説明図である。図６（Ｃ）は、アンテナ部の開口面積が異なる場合の移動機に搭載されているアンテナ１３０と対向するリーダライタに搭載されているアンテナ１６０との位置関係を示す図である。 FIG. 6A is a diagram showing a positional relationship between the antenna 130 mounted on the mobile device and the antenna 160 mounted on the reader / writer facing the mobile device when the opening areas of the antenna units are different. FIG. 6B is an explanatory diagram when the mobile device having a small opening area and the reader / writer are separated from each other. FIG. 6C is a diagram showing a positional relationship between the antenna 130 mounted on the mobile device and the antenna 160 mounted on the reader / writer facing the antenna 130 when the opening areas of the antenna units are different.
　図６（Ａ）に示すように、開口面積の小さいアンテナ部１３０ａを有する移動機に搭載されているアンテナ１３０と、開口面積の大きいアンテナ部１６０ａを有するリーダライタに搭載されているアンテナ１６０とが通信する場合、ループアンテナを形成する各アンテナ部１３０ａ，１６０ａ間の電磁結合が弱いため、通信が安定しない。 As shown in FIG. 6A, an antenna 130 mounted on a mobile device having an antenna portion 130a having a small opening area and an antenna 160 mounted on a reader / writer having an antenna portion 160a having a large opening area. When communicating, since the electromagnetic coupling between the antenna portions 130a and 160a forming the loop antenna is weak, the communication is not stable.
　また、図６（Ｂ）に示すように、アンテナ部の開口面積が小さいもの同士の、移動機に搭載されているアンテナ１３０とリーダライタに搭載されているアンテナ１６０とが通信する場合、移動機とリーダライタとの通信距離が短くなり、通信性能が制限される。 In addition, as shown in FIG. 6B, when the antenna 130 mounted on the mobile device and the antenna 160 mounted on the reader / writer communicate with each other having a small opening area of the antenna portion. Communication distance between the reader / writer and the communication performance is limited.
　また、図６（Ｃ）に示すように、開口面積の大きいアンテナ部１３０ａを有する移動機に搭載されているアンテナ１３０と開口面積の小さいアンテナ部１６０ａを有するリーダライタに搭載されているアンテナ１６０とが通信する場合、ループアンテナを形成する各アンテナ部１３０ａ，１６０ａ間の電磁結合が弱いため、通信が安定しない。 Further, as shown in FIG. 6C, an antenna 130 mounted on a mobile device having an antenna portion 130a having a large opening area and an antenna 160 mounted on a reader / writer having an antenna portion 160a having a small opening area. Communication, the electromagnetic coupling between the antenna portions 130a and 160a forming the loop antenna is weak, and communication is not stable.
　また、アンテナ部の開口面積が大きいもの同士の、移動機に搭載されているアンテナ１３０とリーダライタに搭載されているアンテナ１６０が通信を行う場合においても、次のような問題があった。図７（Ａ）は、アンテナ部の開口面積が大きいもの同士の、移動機に搭載されているアンテナ１３０と対向するリーダライタに搭載されているアンテナ１６０との位置関係を示す図である。図７（Ｂ）は移動機に搭載されているアンテナ１３０と対向するリーダライタに搭載されているアンテナ１６０との各長手方向が垂直である場合の位置関係を示す図である。図７（Ｃ）は、移動機に搭載されているアンテナ１３０とリーダライタに搭載されているアンテナ１６０との上面図である。 In addition, when the antenna 130 mounted on the mobile device and the antenna 160 mounted on the reader / writer communicate with each other having a large opening area of the antenna portion, the following problems exist. FIG. 7A is a diagram illustrating a positional relationship between antennas having a large opening area of an antenna unit and an antenna 160 mounted on a reader / writer facing the antenna 130 mounted on the mobile device. FIG. 7B is a diagram showing a positional relationship when the longitudinal directions of the antenna 130 mounted on the mobile device and the antenna 160 mounted on the reader / writer facing the antenna 130 are vertical. FIG. 7C is a top view of the antenna 130 mounted on the mobile device and the antenna 160 mounted on the reader / writer.
　図７（Ａ）に示すように、２つのアンテナ部（ループアンテナ）１３０ａ，１６０ａの長手方向が平行である場合、各ループアンテナ間の電磁結合が強く、所望の通信性能が確保される。 As shown in FIG. 7A, when the longitudinal directions of the two antenna portions (loop antennas) 130a and 160a are parallel, the electromagnetic coupling between the loop antennas is strong, and desired communication performance is ensured.
　一方、図７（Ｂ）及び図７（Ｃ）に示すように、２つのアンテナ部（ループアンテナ）１３０ａ，１６０ａの長手方向が互いに垂直である場合、重なる部分１８０の面積が小さくなるので、各ループアンテナ間の電磁結合が弱くなり、所望の通信性能を得ることが困難になる。 On the other hand, as shown in FIGS. 7B and 7C, when the longitudinal directions of the two antenna portions (loop antennas) 130a and 160a are perpendicular to each other, the area of the overlapping portion 180 is reduced. The electromagnetic coupling between the loop antennas becomes weak, making it difficult to obtain desired communication performance.
　また、特許文献１，２で示したように、異なるＲＦＩＤシステム又は周波数帯域に対し、それぞれのアンテナ素子を形成して１つのアンテナ装置に組み込む場合、複数のアンテナ素子が必要となるので、小型化・薄型化が困難となる。 In addition, as shown in Patent Documents 1 and 2, when each antenna element is formed for different RFID systems or frequency bands and incorporated in one antenna device, a plurality of antenna elements are required.・ Thinning becomes difficult.
　また、特許文献３で示したように、機能毎の信号を検出し、スイッチを用いてアンテナ条件を切り替えるため、同一の機能を用いる場合にアンテナ条件を切り替えることは困難となる。 Also, as shown in Patent Document 3, since the signal for each function is detected and the antenna condition is switched using a switch, it is difficult to switch the antenna condition when using the same function.
　本発明は、上記従来の問題を解決するためになされたものであり、１つのアンテナでさまざまな形状のループアンテナを有する外部通信装置と安定した通信性能を確保するアンテナ装置及び携帯無線機を提供することを目的とする。 The present invention has been made to solve the above-described conventional problems, and provides an external communication device having loop antennas of various shapes with a single antenna, and an antenna device and a portable wireless device that ensure stable communication performance. The purpose is to do.
　本発明は、アンテナ装置であって、開口面積の大きい第１のアンテナと、前記第１のアンテナより開口面積の小さい第２のアンテナと、を備え、前記第１のアンテナ及び前記第２のアンテナが１つのアンテナとして接続されている。 The present invention is an antenna device, comprising: a first antenna having a large opening area; and a second antenna having a smaller opening area than the first antenna, wherein the first antenna and the second antenna Are connected as one antenna.
　この構成により、１つのアンテナでさまざまな形状のループアンテナを有する外部通信装置と安定した通信性能を確保することができる。 This configuration can ensure stable communication performance with an external communication device having loop antennas of various shapes with one antenna.
　本発明によれば、第１のアンテナおよび第２のアンテナが１つのアンテナとして接続されているので、１つのアンテナでさまざまな形状のループアンテナを有する外部通信装置と安定した通信性能を確保することができる。
　また、アンテナの接点が２個で済み、しかも、片面基板で形成可能であるので、小型化・薄型化を図ることができる。さらに、スイッチなどの回路部品を追加することなく、不要な部品を減らすことができる。 According to the present invention, since the first antenna and the second antenna are connected as one antenna, it is possible to ensure stable communication performance with an external communication device having loop antennas of various shapes with one antenna. Can do.
Further, since the antenna has only two contact points and can be formed with a single-sided substrate, it can be reduced in size and thickness. Furthermore, unnecessary parts can be reduced without adding circuit parts such as switches.
本実施形態における携帯情報端末を含むＲＦＩＤシステムの構成を示す図The figure which shows the structure of the RFID system containing the portable information terminal in this embodiment （Ａ）携帯情報端末に搭載されたループアンテナの形状を示す平面図、（Ｂ）携帯情報端末に搭載されたループアンテナの形状を示す斜視図、（Ｃ）リーダライタに搭載されたループアンテナの形状を示す平面図(A) A plan view showing the shape of the loop antenna mounted on the portable information terminal, (B) a perspective view showing the shape of the loop antenna mounted on the portable information terminal, and (C) the loop antenna mounted on the reader / writer. Plan view showing shape 携帯情報端末に搭載のアンテナと対向するリーダライタに搭載のアンテナとの位置関係を示す図、（Ａ）携帯情報端末とリーダライタとの距離が離れている場合の説明図、（Ｂ）携帯情報端末とリーダライタとの距離が近い場合の説明図The figure which shows the positional relationship of the antenna mounted in the reader / writer facing the antenna mounted in the portable information terminal, (A) An explanatory diagram when the distance between the portable information terminal and the reader / writer is long, (B) Mobile information Explanatory drawing when the distance between the terminal and reader / writer is short 携帯情報端末に搭載のアンテナとリーダライタに搭載のアンテナとの距離と、携帯情報端末に搭載のアンテナにおける受信電圧の変化とを示すグラフA graph showing a distance between an antenna mounted on a portable information terminal and an antenna mounted on a reader / writer, and a change in received voltage at the antenna mounted on the portable information terminal （Ａ）従来の移動機に搭載されているアンテナと対向するリーダライタに搭載されているアンテナとの位置関係を示す図、（Ｂ）従来の移動機とリーダライタとが近い場合の説明図、（Ｃ）従来の移動機とリーダライタとが離れている場合の説明図(A) The figure which shows the positional relationship with the antenna mounted in the reader / writer facing the antenna mounted in the conventional mobile device, (B) The explanatory view when the conventional mobile device and the reader / writer are close, (C) Explanatory drawing when the conventional mobile device and the reader / writer are separated （Ａ）アンテナ部の開口面積が異なる場合の移動機に搭載されているアンテナと対向するリーダライタに搭載されているアンテナとの位置関係を示す図、（Ｂ）それぞれ開口面積の小さい移動機とリーダライタとが通信する場合の説明図、（Ｃ）アンテナ部の開口面積が異なる場合の移動機に搭載されているアンテナと対向するリーダライタに搭載されているアンテナとの位置関係を示す図(A) The figure which shows the positional relationship with the antenna mounted in the reader / writer facing the antenna mounted in the mobile device in case the opening area of an antenna part differs, (B) Each mobile device with a small opening area Explanatory drawing when communicating with a reader / writer, (C) a diagram showing the positional relationship between the antenna mounted on the mobile device and the antenna mounted on the opposite reader / writer when the opening area of the antenna section is different （Ａ）アンテナ部の開口面積が大きいもの同士の、移動機に搭載されているアンテナと対向するリーダライタに搭載されているアンテナとの各長手方向が平行である場合の位置関係を示す図、（Ｂ）移動機に搭載されているアンテナと対向するリーダライタに搭載されているアンテナとの各長手方向が垂直である場合の位置関係を示す図、（Ｃ）移動機に搭載されているアンテナとリーダライタに搭載されているアンテナとの上面図(A) The figure which shows the positional relationship when each longitudinal direction of the antenna mounted in the reader / writer facing the antenna mounted in the mobile device and the antenna mounted on the mobile device are parallel to each other with a large opening area of the antenna unit. (B) The figure which shows the positional relationship in case each longitudinal direction is perpendicular | vertical with the antenna mounted in the reader / writer facing the antenna mounted in the mobile device, (C) The antenna mounted in the mobile device And top view of antenna mounted on reader / writer
　以下、本発明に係るアンテナ装置及び携帯無線機の実施形態について、図面を参照して説明する。本実施形態のアンテナ装置は、ＲＦＩＤシステムにおける携帯無線機（移動機）としての携帯情報端末に搭載される。 Hereinafter, embodiments of an antenna device and a portable wireless device according to the present invention will be described with reference to the drawings. The antenna device of this embodiment is mounted on a portable information terminal as a portable wireless device (mobile device) in an RFID system.
　図１は、本実施形態における携帯情報端末１０を含むＲＦＩＤシステム１の構成を示す図である。ＲＦＩＤシステム１は、携帯無線機としての携帯情報端末１０、及び外部通信装置としてのリーダライタ５０を含む構成である。 FIG. 1 is a diagram showing a configuration of an RFID system 1 including a portable information terminal 10 in the present embodiment. The RFID system 1 includes a portable information terminal 10 as a portable radio device and a reader / writer 50 as an external communication device.
（携帯情報端末１０）
　携帯情報端末１０は、ＲＦＩＤアンテナ部１１、ＲＦＩＤ無線部１２、ＲＦＩＤ制御部１３、メモリ１４、インタフェース（ＩＦ）部１５、中央制御部１６、情報格納部１７、表示部１８、入力部１９及び無線通信部２０を含む構成である。 (Portable information terminal 10)
The portable information terminal 10 includes an RFID antenna unit 11, an RFID radio unit 12, an RFID control unit 13, a memory 14, an interface (IF) unit 15, a central control unit 16, an information storage unit 17, a display unit 18, an input unit 19, and a radio. The configuration includes the communication unit 20.
　ＲＦＩＤアンテナ部１１は、アンテナ素子であるループアンテナ３１及び共振回路用コンデンサ３２を含む構成であり、リーダライタ５０との間で非接触にてデータ通信（送受信）を行う。 The RFID antenna unit 11 includes a loop antenna 31 which is an antenna element and a resonance circuit capacitor 32, and performs data communication (transmission / reception) with the reader / writer 50 in a non-contact manner.
　ＲＦＩＤ無線部１２は、検波、変復調、クロック抽出等、ループアンテナ３１を介してリーダライタ５０との間で送受信されるアナログ信号の送受信に関する処理を行う。 The RFID wireless unit 12 performs processing related to transmission / reception of analog signals transmitted / received to / from the reader / writer 50 via the loop antenna 31 such as detection, modulation / demodulation, clock extraction, and the like.
　ＲＦＩＤ制御部１３は、リーダライタ５０との間で送受信されるデータを処理し、ＲＦＩＤ無線部１２の動作を統括的に制御する。ＲＦＩＤ制御部１３には、ＲＦＩＤに関する情報を記憶するメモリ１４が接続される。 The RFID control unit 13 processes data transmitted to and received from the reader / writer 50 and controls the operation of the RFID wireless unit 12 in an integrated manner. The RFID control unit 13 is connected to a memory 14 that stores information related to RFID.
　メモリ１４は、例えばフラッシュメモリ等を用いて構成され、リーダライタ５０との間で送受信される各種のデータを格納する。 The memory 14 is configured using, for example, a flash memory, and stores various data transmitted to and received from the reader / writer 50.
　インタフェース部１５は、ＲＦＩＤ制御部１３を中央制御部１６、情報格納部１７、表示部１８、入力部１９、無線通信部２０と接続するための機能モジュールである。メモリ１４に書き込まれたデータは、インタフェース部１５を介して、中央制御部１６、情報格納部１７、表示部１８、入力部１９、無線通信部２０に転送される。 The interface unit 15 is a functional module for connecting the RFID control unit 13 to the central control unit 16, the information storage unit 17, the display unit 18, the input unit 19, and the wireless communication unit 20. Data written in the memory 14 is transferred to the central control unit 16, the information storage unit 17, the display unit 18, the input unit 19, and the wireless communication unit 20 via the interface unit 15.
　中央制御部１６は、ＣＰＵ（Central Processing Unit）、ＲＯＭ（Read Only Memory）、ＲＡＭ（Random Access Memory）等を用いて構成され、ＣＰＵがＲＯＭに格納された各種プログラムを実行することにより、携帯情報端末１０の動作に関する各種の処理を行う。中央制御部１６には、携帯情報端末１０にて利用可能なアプリケーション及びコンテンツデータ等の各種情報を格納する情報格納部１７が接続される。 The central control unit 16 is configured using a CPU (Central Processing Unit), a ROM (Read Only Memory), a RAM (Random Access Memory), and the like, and the CPU executes various programs stored in the ROM, so that the portable information Various processes related to the operation of the terminal 10 are performed. Connected to the central control unit 16 is an information storage unit 17 that stores various types of information such as applications and content data that can be used in the portable information terminal 10.
　表示部１８は、ＬＣＤ（Liquid Crystal Display）等を用いて構成され、ＲＦＩＤ機能の状態、各種の処理結果、コンテンツデータの再生結果等をＬＣＤ画面に出力する。 The display unit 18 is configured using an LCD (Liquid Crystal Display) or the like, and outputs an RFID function state, various processing results, content data reproduction results, and the like to the LCD screen.
　入力部１９は、ボタン、テンキー、スイッチ、ジョグダイヤル、ＬＣＤ画面に配置されたタッチパネル等を用いて構成され、携帯情報端末１０への操作指示又はデータ入力のユーザ操作を受け付ける。 The input unit 19 is configured by using a button, a numeric keypad, a switch, a jog dial, a touch panel arranged on the LCD screen, and the like, and accepts an operation instruction to the portable information terminal 10 or a user operation of data input.
　無線通信部２０は、アンテナ２１を介して外部の基地局（不図示）と無線通信を行うための無線通信機能を有する。これらの各部はバッテリ（不図示）から給電されて駆動する。 The wireless communication unit 20 has a wireless communication function for performing wireless communication with an external base station (not shown) via the antenna 21. These units are driven by being supplied with power from a battery (not shown).
（リーダライタ５０）
　リーダライタ５０は、ＲＦＩＤアンテナ部５１、ＲＦＩＤ無線部５２、制御部５３、メモリ５４及びインタフェース（ＩＦ）部５５を含む構成である。 (Reader / Writer 50)
The reader / writer 50 includes an RFID antenna unit 51, an RFID radio unit 52, a control unit 53, a memory 54, and an interface (IF) unit 55.
　ＲＦＩＤアンテナ部５１は、アンテナ素子であるループアンテナ６１及び共振回路用コンデンサ６２を含む構成であり、携帯情報端末１０との間で非接触にてデータ通信（送受信）を行う。 The RFID antenna unit 51 includes a loop antenna 61 that is an antenna element and a resonance circuit capacitor 62, and performs data communication (transmission / reception) with the portable information terminal 10 in a non-contact manner.
　ＲＦＩＤ無線部５２は、検波、変復調、クロック抽出等、ループアンテナ６１を介して携帯情報端末１０との間で送受信されるアナログ信号の送受信に関する処理を行う。 The RFID radio unit 52 performs processing related to transmission / reception of analog signals transmitted / received to / from the portable information terminal 10 via the loop antenna 61, such as detection, modulation / demodulation, clock extraction, and the like.
　制御部５３は、携帯情報端末１０との間で送受信されるデータを処理し、ＲＦＩＤ無線部５２の動作を統括的に制御する。制御部５３には、ＲＦＩＤに関する情報を記憶するメモリ５４が接続される。 The control unit 53 processes data transmitted to and received from the portable information terminal 10 and controls the operation of the RFID wireless unit 52 in an integrated manner. The control unit 53 is connected to a memory 54 that stores information related to RFID.
　メモリ５４は、例えばフラッシュメモリ等を用いて構成され、携帯情報端末１０との間で送受信される各種のデータ、例えば携帯情報端末１０の識別情報、及び読み取りエラー情報等を格納する。 The memory 54 is configured using, for example, a flash memory, and stores various data transmitted to and received from the portable information terminal 10, for example, identification information of the portable information terminal 10, reading error information, and the like.
　インタフェース部５５は、リーダライタ５０を図１の後段（左端の矢印側）のデータ処理装置（不図示）と接続するものであり、例えば携帯情報端末１０との間で送受信されたデータをデータ処理装置に出力する。 The interface unit 55 connects the reader / writer 50 to a data processing device (not shown) in the rear stage (left arrow side) of FIG. 1, and for example, processes data transmitted / received to / from the portable information terminal 10. Output to the device.
　図２（Ａ）は、携帯情報端末１０に搭載されたループアンテナ３１の形状を示す平面図であり、基板４２に形成された携帯情報端末１０に搭載のループアンテナ３１の形状を示す。基板４２はＦＰＣ（Flexible Printed Circuits）、ＦＲ－４等の材質を用いて構成されている。 FIG. 2A is a plan view showing the shape of the loop antenna 31 mounted on the portable information terminal 10, and shows the shape of the loop antenna 31 mounted on the portable information terminal 10 formed on the substrate 42. The substrate 42 is made of a material such as FPC (Flexible Printed Circuits) or FR-4.
　ループアンテナ３１は、基板４２の周縁部に沿って複数回巻かれた開口面積の大きいアンテナ部３１ａ、基板４２の略中央部に複数回巻かれた開口面積の小さいアンテナ部３１ｂ、及びジャンパ線３１ｃからなるダブルループアンテナである。ここでは、アンテナ部３１ａ，３１ｂは、それぞれ任意の線数（例えば２線）になるように巻かれている。また、アンテナ部３１ｂは、アンテナ部３１ａの内側に形成される。 The loop antenna 31 includes an antenna portion 31a having a large opening area that is wound a plurality of times along the peripheral edge of the substrate 42, an antenna portion 31b having a small opening area that is wound a plurality of times at a substantially central portion of the substrate 42, and a jumper wire 31c. It is a double loop antenna consisting of Here, the antenna units 31a and 31b are wound so as to have an arbitrary number of wires (for example, two wires). Moreover, the antenna part 31b is formed inside the antenna part 31a.
　ループアンテナ３１の両端部は、それぞれ基板４２に形成されたホット側の接点３１ｄ（第１接点）、ＧＮＤ側の接点３１ｅ（第２接点）に接続される。 Both end portions of the loop antenna 31 are connected to a hot-side contact 31d (first contact) and a GND-side contact 31e (second contact) formed on the substrate 42, respectively.
　このように、アンテナ部３１ａの一端とアンテナ部３１ｂの一端が接続され、アンテナ部３１ａの他端が接点３１ｄに接続され、アンテナ部３１ｂの他端がジャンパ線３１ｃを介して接点３１ｅに接続される。これにより、ループアンテナ３１は、一筆書きのような配線パターンで一体化される。図２（Ａ）に示すループアンテナ３１は接点３１ｅを接点３１ｄと並べるためにジャンパ線３１ｃを用いた一例であるが、接点３１ｅはループアンテナ３１のループ内部に配置し、ジャンパ線３１ｃを不要にしても良い。 Thus, one end of the antenna unit 31a and one end of the antenna unit 31b are connected, the other end of the antenna unit 31a is connected to the contact 31d, and the other end of the antenna unit 31b is connected to the contact 31e via the jumper wire 31c. The Thereby, the loop antenna 31 is integrated with a wiring pattern like a one-stroke drawing. The loop antenna 31 shown in FIG. 2A is an example in which the jumper wire 31c is used to align the contact point 31e with the contact point 31d. However, the contact point 31e is disposed inside the loop of the loop antenna 31 so that the jumper wire 31c is unnecessary. May be.
　本実施形態では、ループアンテナ３１の形状は、図２（Ａ）の寸法ａ、ｂ、ｃの比率で表されるような矩形となっているが、他の比率の矩形、円形、その他の形状を用いて構成されてもよく、図２（Ａ）に示す形状に限定されない。 In the present embodiment, the shape of the loop antenna 31 is a rectangle represented by the ratio of dimensions a, b, and c in FIG. 2A, but other ratios of rectangle, circle, and other shapes are used. It may be comprised using, and it is not limited to the shape shown to FIG.
　図２（Ｂ）は、図２（Ａ）で示されるダブルループアンテナとして形成されたループアンテナ３１の形状を、分かり易く説明するために、模式的に表す斜視図である。以下の説明では、図２（Ｂ）のように模式的に表されたループアンテナの形状を用いることとする。 FIG. 2 (B) is a perspective view schematically showing the shape of the loop antenna 31 formed as the double loop antenna shown in FIG. 2 (A) for easy understanding. In the following description, the shape of the loop antenna schematically shown in FIG. 2B is used.
　図２（Ｃ）は、リーダライタ５０に搭載のループアンテナ６１の形状を示す平面図である。ループアンテナ６１は、基板６５の周縁部に沿って巻かれたアンテナ部６１ａ、アンテナ部６１ａの両端がそれぞれ接続される接点６１ｂ、６１ｃからなる。 FIG. 2C is a plan view showing the shape of the loop antenna 61 mounted on the reader / writer 50. The loop antenna 61 includes an antenna portion 61a wound along the peripheral edge of the substrate 65, and contacts 61b and 61c to which both ends of the antenna portion 61a are connected.
　ここで、ループアンテナ３１が形成された基板４２の面は、携帯情報端末１０の筐体の背面側に配置される。一方、ループアンテナ６１が形成された基板６５の面は、リーダライタ５０の筐体の表面側に配置される。 Here, the surface of the substrate 42 on which the loop antenna 31 is formed is disposed on the back side of the casing of the portable information terminal 10. On the other hand, the surface of the substrate 65 on which the loop antenna 61 is formed is disposed on the surface side of the housing of the reader / writer 50.
（ＲＦＩＤシステム１の動作）
　次に、ＲＦＩＤシステム１の動作について説明する。 (Operation of RFID system 1)
Next, the operation of the RFID system 1 will be described.
　ＲＦＩＤシステム１におけるデータの送受信に関する動作は周知技術であるので、周知技術に関する説明は省略し、本実施形態に関する各ループアンテナ３１，６１間の電磁結合の強弱に関する動作について説明する。 Since the operation related to data transmission / reception in the RFID system 1 is a well-known technique, the description related to the well-known technique is omitted, and the operation related to the strength of electromagnetic coupling between the loop antennas 31 and 61 related to this embodiment will be described.
　図３は、携帯情報端末１０に搭載のループアンテナ３１と対向するリーダライタ５０に搭載のループアンテナ６１との位置関係を示す図である。図３（Ａ）は、携帯情報端末１０とリーダライタ５０との距離が離れている場合の説明図である。図３（Ｂ）は、携帯情報端末１０とリーダライタ５０との距離が近い場合の説明図である。 FIG. 3 is a diagram showing a positional relationship between the loop antenna 31 mounted on the portable information terminal 10 and the loop antenna 61 mounted on the reader / writer 50 facing the loop antenna 31. FIG. 3A is an explanatory diagram when the distance between the portable information terminal 10 and the reader / writer 50 is long. FIG. 3B is an explanatory diagram when the distance between the portable information terminal 10 and the reader / writer 50 is short.
　図３（Ａ）に示すように、両者間の距離が比較的長い場合、ループアンテナ３１は、リーダライタ５０に搭載のアンテナ部６１ａ，６１ｆの開口面積とほぼ同じ大きさの開口面積を有するアンテナ部３１ａ，３１ｂを用いて、リーダライタ５０と無線通信する。 As shown in FIG. 3A, when the distance between the two is relatively long, the loop antenna 31 has an opening area that is almost the same size as the opening areas of the antenna portions 61a and 61f mounted on the reader / writer 50. Wireless communication with the reader / writer 50 is performed using the units 31a and 31b.
　より具体的には、ループアンテナ３１は、リーダライタ５０に搭載のアンテナ部６１ａの開口面積が大きい場合には、アンテナ部６１ａの開口面積とほぼ同じ大きさの開口面積を有するアンテナ部３１ａを用いて、リーダライタ５０と無線通信する。
　更に、ループアンテナ３１は、リーダライタ５０に搭載のアンテナ部６１ｆの開口面積が小さい場合には、アンテナ部６１ｆの開口面積とほぼ同じ大きさの開口面積を有するアンテナ部３１ｂを用いて、リーダライタ５０と無線通信する。 More specifically, when the opening area of the antenna unit 61a mounted on the reader / writer 50 is large, the loop antenna 31 uses the antenna unit 31a having an opening area substantially the same as the opening area of the antenna unit 61a. Wireless communication with the reader / writer 50.
Furthermore, when the opening area of the antenna portion 61f mounted on the reader / writer 50 is small, the loop antenna 31 uses the antenna portion 31b having an opening area approximately the same as the opening area of the antenna portion 61f. 50 to communicate wirelessly.
　これらの場合、各ループアンテナ３１，６１間の電磁結合が強いため、携帯情報端末１０とリーダライタ５０との間の通信距離を確保することができる。 In these cases, since the electromagnetic coupling between the loop antennas 31 and 61 is strong, the communication distance between the portable information terminal 10 and the reader / writer 50 can be secured.
　また、図３（Ｂ）に示すように、両者間の距離が比較的短い場合でも、ループアンテナ３１は、リーダライタ５０に搭載のアンテナ部６１ａ，６１ｆの開口面積とほぼ同じ大きさの開口面積を有するアンテナ部３１ａ，３１ｂを用いて、リーダライタ５０と無線通信する。 Further, as shown in FIG. 3B, even when the distance between the two is relatively short, the loop antenna 31 has an opening area that is substantially the same as the opening area of the antenna portions 61a and 61f mounted on the reader / writer 50. The reader / writer 50 is wirelessly communicated using the antenna units 31a and 31b having the.
　より具体的には、ループアンテナ３１は、リーダライタ５０に搭載のアンテナ部６１ａの開口面積が大きい場合には、アンテナ部６１ａの開口面積とほぼ同じ大きさの開口面積を有するアンテナ部３１ａを用いて、リーダライタ５０と無線通信する。
　更に、ループアンテナ３１は、リーダライタ５０に搭載のアンテナ部６１ｆの開口面積が小さい場合には、アンテナ部６１ｆの開口面積とほぼ同じ大きさの開口面積を有するアンテナ部３１ｂを用いて、リーダライタ５０と無線通信する。 More specifically, when the opening area of the antenna unit 61a mounted on the reader / writer 50 is large, the loop antenna 31 uses the antenna unit 31a having an opening area substantially the same as the opening area of the antenna unit 61a. Wireless communication with the reader / writer 50.
Further, when the antenna 61f mounted on the reader / writer 50 has a small opening area, the loop antenna 31 uses the antenna unit 31b having an opening area substantially the same as the opening area of the antenna 61f. 50 to communicate wirelessly.
　このように、開口面積の大きいアンテナ部３１ａ、６１ａ同士で、安定した通信を行うことができる。また、開口面積の小さいアンテナ部３１ｂ、６１ｆ同士でも、安定した通信を行うことができる。 Thus, stable communication can be performed between the antenna portions 31a and 61a having a large opening area. In addition, stable communication can be performed between the antenna portions 31b and 61f having a small opening area.
　図４は、携帯情報端末１０に搭載のループアンテナ３１とリーダライタ５０に搭載のループアンテナ６１との距離と、携帯情報端末１０に搭載のループアンテナ３１における受信電圧の変化とを示すグラフである。図４の横軸は、携帯情報端末１０に搭載のループアンテナ３１とリーダライタ５０に搭載のループアンテナ６１との間の距離を示す。図４の縦軸は、ループアンテナ３１の受信電圧の大きさを示す。 FIG. 4 is a graph showing the distance between the loop antenna 31 mounted on the portable information terminal 10 and the loop antenna 61 mounted on the reader / writer 50 and the change in received voltage at the loop antenna 31 mounted on the portable information terminal 10. . The horizontal axis in FIG. 4 indicates the distance between the loop antenna 31 mounted on the portable information terminal 10 and the loop antenna 61 mounted on the reader / writer 50. The vertical axis in FIG. 4 indicates the magnitude of the reception voltage of the loop antenna 31.
　ダブルループアンテナを構成する本実施形態のループアンテナ３１を用いた場合、符号ｍに示すように、ループアンテナ３１の受信電圧は、距離が長くなるほど、連続的になだらかに下がる。一方、従来のループアンテナを用いた場合、符号ｎに示すように、途中で受信電圧が下がる通信不能領域（点線枠ｐ）が存在し、この従来のループアンテナの受信電圧は、距離に対して不連続に変化する。 When the loop antenna 31 of the present embodiment that constitutes a double loop antenna is used, as indicated by the symbol m, the received voltage of the loop antenna 31 decreases continuously and gradually as the distance increases. On the other hand, when the conventional loop antenna is used, as shown by the symbol n, there is an incommunicable region (dotted line frame p) in which the reception voltage decreases midway, and the reception voltage of this conventional loop antenna is It changes discontinuously.
　本実施形態のＲＦＩＤシステム１によれば、１つのアンテナでさまざまな形状のループアンテナを有するリーダライタと安定した通信性能を確保することができる。また、開口面積の小さいアンテナ部を開口面積の大きいアンテナ部の内側に配置することで、アンテナ部の面積を小さくすることができる。また、アンテナと基板との接点が２ヶ所で済むので、アンテナ装置及び携帯無線機の小型化に適する。また、片面基板でアンテナ装置が形成可能であるので、薄型化が可能である。更に、スイッチなどの回路部品を追加することなく、不要な部品を減らすことができる。 According to the RFID system 1 of this embodiment, it is possible to ensure stable communication performance with a reader / writer having loop antennas of various shapes with one antenna. Further, by arranging the antenna portion having a small opening area inside the antenna portion having a large opening area, the area of the antenna portion can be reduced. In addition, since only two contact points between the antenna and the substrate are required, the antenna device and the portable wireless device are suitable for miniaturization. In addition, since the antenna device can be formed using a single-sided substrate, the thickness can be reduced. Furthermore, unnecessary parts can be reduced without adding circuit parts such as switches.
　また、携帯情報端末１０のアンテナ部３１ａは基板４２の周縁部に沿って巻かれており、アンテナ部３１ｂは基板４２の略中央部に巻かれているため、リーダライタ５０に搭載されたさまざま形状のループアンテナに対応することができる。 In addition, since the antenna portion 31a of the portable information terminal 10 is wound along the peripheral portion of the substrate 42, and the antenna portion 31b is wound around the substantially central portion of the substrate 42, various shapes mounted on the reader / writer 50 are provided. It can correspond to the loop antenna of.
　また、携帯情報端末１０のアンテナ部３１ａ，３１ｂは、それぞれ任意の線数（ここでは２線）になるように複数回巻かれているので、リーダライタ５０のアンテナ部６１ａ，６１ｆとの電磁結合を強くすることができる。 Further, since the antenna units 31a and 31b of the portable information terminal 10 are wound a plurality of times so as to have an arbitrary number of wires (here, two wires), electromagnetic coupling with the antenna units 61a and 61f of the reader / writer 50 is performed. Can be strengthened.
　また、ループアンテナ３１が形成された基板４２の片面は、携帯情報端末１０の筐体の背面側に配置されている。携帯情報端末１０の筐体背面をリーダライタ５０の筐体表面に近づけて通信を行う際、電磁結合を強い状態で、携帯情報端末１０はリーダライタ５０と通信することができる。 Further, one side of the substrate 42 on which the loop antenna 31 is formed is disposed on the back side of the casing of the portable information terminal 10. When communicating with the back of the casing of the portable information terminal 10 close to the casing surface of the reader / writer 50, the portable information terminal 10 can communicate with the reader / writer 50 with strong electromagnetic coupling.
　以上、図面を参照しながら各種の実施形態について説明したが、本発明はかかる例に限定されないことは言うまでもない。当業者であれば、特許請求の範囲に記載された範疇内において、各種の変更例または修正例に想到し得ることは明らかであり、それらについても当然に本発明の技術的範囲に属するものと了解される。 Although various embodiments have been described above with reference to the drawings, it goes without saying that the present invention is not limited to such examples. It will be apparent to those skilled in the art that various changes and modifications can be made within the scope of the claims, and these are naturally within the technical scope of the present invention. Understood.
　例えば、上記実施形態では、各アンテナ部３１ａ，３１ｂが任意の線数になるように複数回巻かれたループアンテナ（スパイラルアンテナ）を示したが、１本の線数に巻かれたループアンテナであってもよい。更には、所定のピッチだけ離して任意の線数になるように複数回巻かれたループアンテナ（ヘリカルアンテナ）であってもよい。 For example, in the above embodiment, the loop antenna (spiral antenna) wound a plurality of times so that each of the antenna portions 31a and 31b has an arbitrary number of wires is shown. There may be. Further, it may be a loop antenna (helical antenna) wound a plurality of times so as to have an arbitrary number of lines separated by a predetermined pitch.
　また、上記実施形態では、携帯情報端末１０側に、第１のループアンテナと第２のループアンテナからなるダブルループアンテナを搭載する場合を示したが、リーダライタ側もしくは双方にダブルループアンテナを搭載してもよい。 In the above embodiment, the case where the double loop antenna including the first loop antenna and the second loop antenna is mounted on the portable information terminal 10 side is shown. However, the double loop antenna is mounted on the reader / writer side or both. May be.
　また、上記実施形態では、開口面積の大きいループアンテナ（アンテナ部）の内側に開口面積の小さいループアンテナ（アンテナ部）を形成する場合を示したが、これらを隣接するように形成するようにしてもよい。 In the above-described embodiment, the case where the loop antenna (antenna part) having a small opening area is formed inside the loop antenna (antenna part) having a large opening area has been described. Also good.
　また、上記実施形態では、基板の周縁部に沿って巻かれたアンテナ部（第１のアンテナ）と基板の中央部に巻かれたアンテナ部（第２のアンテナ）を１つのアンテナとして接続する場合を示したが、３つ以上のアンテナを１つのアンテナとして接続してもよい。 Moreover, in the said embodiment, when connecting the antenna part (1st antenna) wound along the peripheral part of a board | substrate and the antenna part (2nd antenna) wound in the center part of a board | substrate as one antenna. However, three or more antennas may be connected as one antenna.
　例えば、基板の中心からリング状に広がった位置（同心上の位置）に、第１のアンテナ、第２のアンテナ、第３のアンテナを設け、これらを接続して１つのアンテナとしてもよい。また、基板の周縁部に沿って巻かれたアンテナ部（第１のアンテナ）の内側に、隣接するように巻かれた２つのアンテナ部（第２、第３のアンテナ）を設け、これらを接続して１つのアンテナとしてもよい。 For example, a first antenna, a second antenna, and a third antenna may be provided at a position (concentric position) spreading in a ring shape from the center of the substrate, and these may be connected to form one antenna. Also, two antenna parts (second and third antennas) wound adjacent to each other are provided inside the antenna part (first antenna) wound along the peripheral edge of the substrate, and these are connected. And it is good also as one antenna.
　また、上記実施形態では、片面基板に配線パターンを設けることでアンテナを形成していたが、多層基板でもよい。さらに基板を用いることなく、線材でループアンテナを形成してもよい。また、線材の他、導電性を有する材質でアンテナを形成してもよい。 In the above embodiment, the antenna is formed by providing the wiring pattern on the single-sided board, but a multilayer board may be used. Furthermore, a loop antenna may be formed with a wire without using a substrate. Moreover, you may form an antenna with the material which has electroconductivity other than a wire.
　また、上記実施形態では、携帯無線機として、携帯情報端末に搭載された場合を示したが、電子タグなど種々のものに搭載可能である。 In the above embodiment, the case where the portable wireless device is mounted on a portable information terminal has been described. However, the portable wireless device can be mounted on various devices such as an electronic tag.
　なお、本出願は、２０１２年１月３０日出願の日本特許出願（特願２０１２－０１６７０１）に基づくものであり、その内容はここに参照として取り込まれる。 Note that this application is based on a Japanese patent application filed on January 30, 2012 (Japanese Patent Application No. 2012-016701), the contents of which are incorporated herein by reference.
　本発明は、対向するアンテナとの通信に用いられるアンテナ装置であり、１つのアンテナでさまざまな形状のループアンテナを有する外部通信装置と安定した通信性能を確保するアンテナ装置及び携帯無線機として有用である。 INDUSTRIAL APPLICABILITY The present invention is an antenna device used for communication with an opposing antenna, and is useful as an antenna device and a portable wireless device that ensure stable communication performance with an external communication device having loop antennas of various shapes with one antenna. is there.
　１　ＲＦＩＤシステム
　１０　携帯情報端末
　１１、５１　ＲＦＩＤアンテナ部
　１２、５２　ＲＦＩＤ無線部
　１３　ＲＦＩＤ制御部
　１４、５４　メモリ
　１５、５５　インタフェース部
　１６　中央制御部
　１７　情報格納部
　１８　表示部
　１９　入力部
　２０　無線通信部
　２１　アンテナ
　３１、６１　ループアンテナ
　３１ａ、３１ｂ、６１ａ、６１ｆ　アンテナ部
　３１ｃ　ジャンパ線
　５０　リーダライタ
　５３　制御部 DESCRIPTION OF SYMBOLS 1 RFID system 10 Portable information terminal 11, 51 RFID antenna part 12, 52 RFID radio part 13 RFID control part 14, 54 Memory 15, 55 Interface part 16 Central control part 17 Information storage part 18 Display part 19 Input part 20 Wireless communication part 21 Antenna 31, 61 Loop antenna 31a, 31b, 61a, 61f Antenna part 31c Jumper wire 50 Reader / writer 53 Control part

Claims (7)

  1. 　開口面積の大きい第１のアンテナと、
    　前記第１のアンテナより開口面積の小さい第２のアンテナと、を備え、
    　前記第１のアンテナ及び前記第２のアンテナが１つのアンテナとして接続されたアンテナ装置。     A first antenna having a large opening area;
    A second antenna having a smaller opening area than the first antenna,
    An antenna device in which the first antenna and the second antenna are connected as one antenna.
  2. 　請求項１に記載のアンテナ装置であって、
    　前記第２のアンテナは、前記第１のアンテナの内側に配置されたアンテナ装置。     The antenna device according to claim 1,
    The second antenna is an antenna device arranged inside the first antenna.
  3. 　請求項２に記載のアンテナ装置であって、
    　前記第１のアンテナの一端と前記第２のアンテナの一端が接続され、前記第１のアンテナの他端が第１接点に接続され、前記第２のアンテナの他端が第２接点に接続されたアンテナ装置。     The antenna device according to claim 2, wherein
    One end of the first antenna and one end of the second antenna are connected, the other end of the first antenna is connected to a first contact, and the other end of the second antenna is connected to a second contact. Antenna device.
  4. 　請求項３に記載のアンテナ装置であって、
    　前記第１のアンテナ、前記第２のアンテナ、前記第１接点及び前記第２接点が基板に形成されたアンテナ装置。     The antenna device according to claim 3, wherein
    An antenna device in which the first antenna, the second antenna, the first contact, and the second contact are formed on a substrate.
  5. 　請求項４に記載のアンテナ装置であって、
    　前記第１のアンテナは、前記基板の周縁部に沿って巻かれたループアンテナであり、
    　前記第２のアンテナは、前記基板の中央部に巻かれたループアンテナであるアンテナ装置。     The antenna device according to claim 4, wherein
    The first antenna is a loop antenna wound along a peripheral edge of the substrate;
    The antenna device, wherein the second antenna is a loop antenna wound around a central portion of the substrate.
  6. 　請求項５に記載のアンテナ装置であって、
    　前記第１のアンテナ及び前記第２のアンテナは、それぞれ所定の線数になるように複数回巻かれたループアンテナであるアンテナ装置。     The antenna device according to claim 5, wherein
    The antenna device, wherein the first antenna and the second antenna are loop antennas each of which is wound a plurality of times so as to have a predetermined number of wires.
  7. 　請求項１～６のうちいずれか一項に記載のアンテナ装置が搭載され、対向する外部通信装置のアンテナと電磁結合する携帯無線機。 A portable wireless device equipped with the antenna device according to any one of claims 1 to 6 and electromagnetically coupled to an antenna of an opposing external communication device.
PCT/JP2012/007027 2012-01-30 2012-11-01 Antenna device and portable wireless device WO2013114491A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2012016701A JP2015080003A (en) 2012-01-30 2012-01-30 Antenna arrangement and portable radio apparatus
JP2012-016701 2012-01-30

Publications (1)

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WO2014097783A1 (en) * 2012-12-21 2014-06-26 デクセリアルズ株式会社 Wireless communication system, antenna module and electronic device
JP6100945B1 (en) * 2016-03-30 2017-03-22 株式会社バンダイ Toy system and toy

Citations (3)

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JPH08293724A (en) * 1995-04-22 1996-11-05 Sony Chem Corp Composite loop antenna
JPH10209737A (en) * 1996-11-22 1998-08-07 Teruya:Kk Loop antenna and authentication device
JP2001313515A (en) * 2000-02-21 2001-11-09 Tamura Electric Works Ltd Antenna system and contactless ic card reader/writer

Patent Citations (3)

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Publication number Priority date Publication date Assignee Title
JPH08293724A (en) * 1995-04-22 1996-11-05 Sony Chem Corp Composite loop antenna
JPH10209737A (en) * 1996-11-22 1998-08-07 Teruya:Kk Loop antenna and authentication device
JP2001313515A (en) * 2000-02-21 2001-11-09 Tamura Electric Works Ltd Antenna system and contactless ic card reader/writer

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2014097783A1 (en) * 2012-12-21 2014-06-26 デクセリアルズ株式会社 Wireless communication system, antenna module and electronic device
US9496598B2 (en) 2012-12-21 2016-11-15 Dexerials Corporation Wireless communication system, antenna module and electronic device
JP6100945B1 (en) * 2016-03-30 2017-03-22 株式会社バンダイ Toy system and toy
JP2017183950A (en) * 2016-03-30 2017-10-05 株式会社バンダイ Toy system and toy

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