CA2219099A1 - Antenna array in an rfid system - Google Patents

Antenna array in an rfid system

Info

Publication number
CA2219099A1
CA2219099A1 CA002219099A CA2219099A CA2219099A1 CA 2219099 A1 CA2219099 A1 CA 2219099A1 CA 002219099 A CA002219099 A CA 002219099A CA 2219099 A CA2219099 A CA 2219099A CA 2219099 A1 CA2219099 A1 CA 2219099A1
Authority
CA
Canada
Prior art keywords
antenna
receive
planar
antenna array
center
Prior art date
Legal status (The legal status 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 status listed.)
Granted
Application number
CA002219099A
Other languages
French (fr)
Other versions
CA2219099C (en
Inventor
R. Anthony Shober
Eric Sweetman
You-Sun Wu
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Nokia of America Corp
Original Assignee
Lucent Technologies Inc
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 Lucent Technologies Inc filed Critical Lucent Technologies Inc
Publication of CA2219099A1 publication Critical patent/CA2219099A1/en
Application granted granted Critical
Publication of CA2219099C publication Critical patent/CA2219099C/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

Links

Classifications

    • 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
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q21/00—Antenna arrays or systems
    • H01Q21/06—Arrays of individually energised antenna units similarly polarised and spaced apart
    • H01Q21/08—Arrays of individually energised antenna units similarly polarised and spaced apart the units being spaced along or adjacent to a rectilinear path
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q9/00—Electrically-short antennas having dimensions not more than twice the operating wavelength and consisting of conductive active radiating elements
    • H01Q9/04—Resonant antennas
    • H01Q9/16—Resonant antennas with feed intermediate between the extremities of the antenna, e.g. centre-fed dipole
    • H01Q9/18—Vertical disposition of the antenna

Abstract

In accordance with the present invention, a general antenna system is disclosed suitable for applications in which an RFID Tag passes by an Interrogator.
We then disclose a specific antenna design that uses a single planar antenna fortransmit and a multi-element planar antenna array for receive. The multi-elementplanar antenna array is spaced such that each of the planar elements is four inches apart, center-to-center, thus defining a narrow 30° receive beamwidth in the horizontal plane. The vertical receive bandwidth is much greater than 30°, facilitating the Interrogator receiving signals at a variety of elevations. Furthermore, a multi-way microstrip combiner is used to sum the signals received from each of the planar antenna. To block interference from the transmit antenna and to improve receivesensitivity, this multi-way microstrip combiner is shielded using, in one embodiment, copper tape along its edges. In a specific embodiment, a four element receive antenna design is disclosed.
CA002219099A 1996-12-31 1997-10-23 Antenna array in an rfid system Expired - Fee Related CA2219099C (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US775,217 1996-12-31
US08/775,217 US6184841B1 (en) 1996-12-31 1996-12-31 Antenna array in an RFID system

Publications (2)

Publication Number Publication Date
CA2219099A1 true CA2219099A1 (en) 1998-06-30
CA2219099C CA2219099C (en) 2002-04-16

Family

ID=25103689

Family Applications (1)

Application Number Title Priority Date Filing Date
CA002219099A Expired - Fee Related CA2219099C (en) 1996-12-31 1997-10-23 Antenna array in an rfid system

Country Status (3)

Country Link
US (1) US6184841B1 (en)
JP (1) JP3561133B2 (en)
CA (1) CA2219099C (en)

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CA2219099C (en) 2002-04-16
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US6184841B1 (en) 2001-02-06

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