CA2536386C - Security tag with three dimensional antenna array made from flat stock and fabrication method thereof - Google Patents

Security tag with three dimensional antenna array made from flat stock and fabrication method thereof Download PDF

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Publication number
CA2536386C
CA2536386C CA2536386A CA2536386A CA2536386C CA 2536386 C CA2536386 C CA 2536386C CA 2536386 A CA2536386 A CA 2536386A CA 2536386 A CA2536386 A CA 2536386A CA 2536386 C CA2536386 C CA 2536386C
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CA
Canada
Prior art keywords
antenna
web material
frequencies
dipole
antenna configuration
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.)
Expired - Fee Related
Application number
CA2536386A
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French (fr)
Other versions
CA2536386A1 (en
Inventor
Gary T. Mazoki
Anthony F. Piccoli
Thomas J. Clare
Eric Eckstein
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.)
Checkpoint Systems Inc
Original Assignee
Checkpoint Systems Inc
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Filing date
Publication date
Application filed by Checkpoint Systems Inc filed Critical Checkpoint Systems Inc
Publication of CA2536386A1 publication Critical patent/CA2536386A1/en
Application granted granted Critical
Publication of CA2536386C publication Critical patent/CA2536386C/en
Expired - Fee Related legal-status Critical Current
Anticipated expiration legal-status Critical

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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
    • 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
    • G06K19/07786—Antenna details the antenna being of the HF type, such as a dipole
    • 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
    • H01Q1/24—Supports; Mounting means by structural association with other equipment or articles with receiving set
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q21/00—Antenna arrays or systems
    • H01Q21/24—Combinations of antenna units polarised in different directions for transmitting or receiving circularly and elliptically polarised waves or waves linearly polarised in any direction
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q21/00—Antenna arrays or systems
    • H01Q21/24—Combinations of antenna units polarised in different directions for transmitting or receiving circularly and elliptically polarised waves or waves linearly polarised in any direction
    • H01Q21/26—Turnstile or like antennas comprising arrangements of three or more elongated elements disposed radially and symmetrically in a horizontal plane about a common centre
    • 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
    • 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
    • H01Q9/28—Conical, cylindrical, cage, strip, gauze, or like elements having an extended radiating surface; Elements comprising two conical surfaces having collinear axes and adjacent apices and fed by two-conductor transmission lines
    • H01Q9/285—Planar dipole

Abstract

A three-dimensional dipole antenna system or an RFID tag that optimizes detection for a given available volume in which to situate the RFID tag

Description

SECURITY TAG WITH THREE DIMENSIONAL ANTENNA ARRAY MADE FROM FLAT STOCK AND
FABRICATION METHOD THEREOF

SPECIFICATION
BACKGROUND OF THE INVENTION
1. FIELD OF INVENTION
This invention relates to security tags and, more particularly, to an ultra-high frequency (LIHF) dipole antenna system for a radio frequency identification (RFID) tag that optimizes detection for a given available volume in which to situate the RFID tag.
2. DESCRIPTION OF RELATED ART
Low cost tags manufactured by continuous feed processes are normally formed from tag stock and are therefore two-dimensional. The performance of two-dimensional tags is generally a strong function of the orientation of the tag's antenna relative to the antenna o f the tag interrogator and reader.
One approach used for reducing the sensitivity of tags to their orientation with respect to the interrogator/reader include increasing the effective area of the tag antenna so that greater energy is extracted from the incident electromagnetic field. Another approach, used with dipole antennas, is to orient two or more antennas at angles to each other within the plane of the tag stock. However, both of the aforementioned approaches results in a larger tag, adding manufacturing expense and reducing marketability.
To accommodate the use of two dipole antennae in RFID tags, one company, Matrics, Inc. of Rockville, Maryland, has developed an RFID system IC (e.g., on Matrics Tag X1020) that provides for a plurality of RF inputs along with a ground terminal.
However, especially where UHF frequencies (e.g., 850 MHz-950 MHz) and microwave frequencies (e.g., 2.3 Ghz- 2.6 Ghz) are used in communicating with RFU) tags, there remains a need for a UHF(or microwave) dipole antenna system that optimizes detection for a given volume in which the RFID tag is positioned.

BRIEF SUMMARY OF THE INVENTION
An antenna configuration for use in a security tag (e.g., an RFID security tag) that optimizes the receipt of a signal issued from an interrogator or reader. The antenna configuration comprises: a first dipole and a second dipole arranged in a non-parallel nor collinear I

configuration to form a plane (e.g., a web material) comprising the first and second dipoles; and a third dipole being positioned out of the plane.
A method of fabricating a three-dimensional antenna for a security tag (e.g., an RFID
security tag) for optimizing the receipt of a signal issued from an interrogator or reader. The method comprises the steps of: (a) providing a web material (e.g., substrate, flat stock, paper, plastic, etc.); (b) forming a first dipole and a second dipole on the web material and wherein the first dipole and the second dipole are formed to be non-parallel nor collinear with respect to each other; (c) forming a third dipole on the web material;(d) cutting the web material to free a portion of the third dipole from the web material; and (e) displacing the free portion out of the web material.

BRIEF DESCRIPTION OF SEVERAL VIEWS OF THE DRAWINGS
The invention will be described in conjunction with the following drawings in which like reference numerals designate like elements and wherein:
Fig. 1 is a functional diagram of the security tag with three-dimensional antenna;
Fig. 1A are reference Cartesian coordinate axes;
Fig. 2A depicts a part of a substrate containing the RFID integrated circuit and the antenna stubs for the three-dimensional antenna as part of the substrate during manufacture of the tag;
Fig. 2B shows how two of the antenna stubs are lifted out of the substrate to form the dipole antenna is the third (z) axis;
Fig. 2C are reference Cartesian coordinate axes;
Fig. 3 is a plan view diagram of tag stock with multiple elements laid out in two-dimensions;
Fig. 4 is an isometric view diagram of a tag inlay with antenna elements folded so as to be in three-dimensions;
Fig. 4A are reference Cartesian coordinate axes for the second embodiment; and Fig. 5 is an isometric view diagram of a folded tag installed in a back shell of a hard tag housing.

DETAILED DESCRIPTION OF THE INVENTION
It will be appreciated by those skilled in the art that changes could be made to the embodiments described above without departing from the broad inventive concept thereof. It is understood, therefore, that this invention is not limited to the particular embodiments disclosed, but it is intended to cover modifications within the spirit and scope of the present invention as defined by the appended claims.

There is shown at 20 in Fig. 1 an RFID security tag comprising a three-dimensional antenna. The RFID security tag 20 comprises three dipole antennae coupled to an RFID
integrated circuit (IC) 22. A dipole antenna in the x-axis (see Fig. IA for axes orientation) comprises antenna stubs X1 and X2. A dipole antenna in the y-axis comprises antenna stubs Yl and Y2. Finally, a third dipole antenna in the z-axis comprises antenna stubs Z1 and Z2. This RFID security tag 20 can be packaged in an enclosure, e.g., a ball-shaped enclosure, a cubic box-shaped enclosure, etc. The RFID security tag 20 is ideal for placement in shipping pallets, for example, or incorporation into packing or packaging materials. The presence of a dipole in all three dimensions optimizes detection, by the RFID tag 20, of a signal issued from an interrogator or reader (not shown) for a given volume in which the tag 20 is present, especially for signals in the UHF frequency range (e.g., 850 MHz-950 MHz) and in the microwave range (e.g., 2.3 Ghz- 2.6 Ghz). Thus, the three-dimensional antenna forms an improvement over a two-dimensional antenna and operates better than a straight or wavy single dipole antenna.
A very economical method to produce the z-axis dipole is to use security tag flat stock processes for creating all of the dipoles. In particular, as shown in Figs. 2A-2B, all three dipoles are fabricated on a flat sheet of web material (Fig 2A) and electrically coupled to the RFID IC
22. At a subsequent stage, the web material connecting one of the dipoles is cut (see lines C in Fig. 2A), allowing the free end (FE) of each dipole stub to be folded out of the x-y plane (Fig.
2B) and perpendicular to the other two dipoles (see Fig. 2C for axes orientation).
The dipole antennae of the RFID tag 20 of the present invention can be produced using conventional processes using etching, printing (e.g., copper or silver inks, flexographic printing), die cutting, laser cutting, etc. The web material 24 may comprise any flat stock or substrate including paper or plastic, etc. In the preferred embodiment, the thickness of the web material 24 could be in the range of 25 to 90 microns; the antenna stubs X1-Z2 or elements 122/124 (see Figs. 3-5 and corresponding text), e.g., metal trace, could be in the range of 7 to 60 microns or more. However, it is known to those skilled in the art that the thickness of the web material 24 and the antenna stubs X l -Z2/elements 122/124 are not restricted in any way to those ranges and those ranges do not limit the scope of the invention in any way. In fact, it is within the broadest scope of the present invention to include antenna stubs/elements that are embedded in the web material 24, including where the antenna stubs/elements are flush with the surface of the web material 24. The RFID IC 22 can be electrically coupled to the antenna stubs using wire bonding, flip chip processes, contact cementing, etc. Coupling the stubstelements to the RED IC 22 can be accomplished using rectifiers and even multiplexers to provide the signals received from the various dipoles to the RFID IC 22. Thus, it is within the broadest scope of the present invention to include any process whereby the stubs of all of the dipoles are formed on or in the substrate and then electrically coupled to the RFID IC 22. Moreover, it is also within the broadest scope of the present invention to include the security tag manufacturing processes disclosed in U.S.
Patent no. 7,384,496 entitled Security Tags, Apparatus and Methods for Making the Same, filed on February 23, 2004 or disclosed in U.S. Patent no.
6,988,666 entitled Security Tag and Process for Making the Same, filed September 5, 2002.
Both of which are owned by the same Assignee, namely Checkpoint Systems, Inc., as the present application. The antenna stubs (X1-Z2) may include tuning stubs that can be trimmed and holding bars for impedance matching that can be modified to properly tune (e.g., in-line tuning of the dipoles while they reside on/in the substrate) the three dipoles before the z-axis stubs ZI and Z2 are lifted out of the x-y plane.
It should be understood that although the preferred embodiment includes a third dipole (stubs Z1/Z2) that is orthogonally oriented with respect to said first and second dipoles, it is within the broadest scope of the present invention to include a third dipole having stubs that are positioned out of the x-y plane formed by the first and second dipoles but are not necessarily orthogonal to that plane. Thus, the angles 01 and 02 shown in Fig. 2B may be between 0 and 90 with respect to a horizontal reference line in the x-y plane. Moreover, it is also within the broadest scope of the invention wherein the angles 0, and 02 are not equal.
Referring to Fig. 3, there is shown (i.e., a plan view) another embodiment 120 of a two-dimensional antenna array having multiple dipole elements formed on tag stock 24 for use with electronic article surveillance (EAS) and RFID type tags. In particular, two folded dipole elements are shown in this embodiment 120, an outer element 122 around the perimeter of the cut tag stock 24 and an inner element 124 within the area of the outer element 122 (the RFID IC
22 is not shown). The inner element 124 comprises dipole stubs 124A and 124B.
Preferably, the inner 124 and outer elements 122 are formed on the non-conductive tag stock substrate 24 by any of several tag manufacturing process (all of which were previously described above for the tag 20 and all of which are applicable to embodiment 120) that result in an electrically conductive trace which form the antenna stubs. Such processes include, but are limited to, die cutting, conductive ink printing, etching of a conductive foil and additive plating.
The substrate is preferably a polymeric material but could be another substantially non-conductive material such as paper.
Referring to Fig. 4, the embodiment 120 of Fig. 3 is shown folded into a three-dimensional antenna array. The three-dimensional antenna array is formed from the two-dimensional antenna array by cutting the substrate 24 (which is in the x-y plane; see Fig. 4A) around the periphery of the inner element 124 using die cutting or a similar process, and folding the inner element 122 into an upright position, the plan of which is at an angle to the x-y plane of the outer element 122. Fig. 5 shows the inner element 124 of the antenna of Fig. 4 at a substantially perpendicular angle with respect to the outer element 122, installed within the back shell 126 of a hard tag (e.g., a reusable security tag) housing, including a portion of a lock housing 10. Unlike the preferred embodiment 20, the second embodiment 120 is formed by having both dipole stubs 124A and 124B on the same side of the flat stock 24.
It should be noted that although the inner element 124 of the second embodiment 120 is orthogonally oriented with respect to the outer element 122, it is within the broadest scope of the present invention to include an inner element 124 having stubs 124A/124B that are positioned out of the x-y plane formed by the outer element 122 but are not necessarily orthogonal to that plane. Thus, the angles 0A and 0B shown in Fig. 4 may be between 0 and 90 with respect to a horizontal reference line in the x-y plane. Moreover, it is also within the broadest scope of the invention wherein the angles 0A and 0B are not equal.
The three-dimensional antenna array as shown in Figs. 1-5 is not limited to the specific implementation of the depicted embodiments. For example, the inner 124 and outer 122 elements need not be folded dipoles but could be other antenna configurations such as loops, and the array could be a combination of various antenna element configurations such as loops and dipoles. Further, the elements of the two-dimensional antenna need not be formed within each other but could be adjacent to each other. Also, the number of elements may be more than two and the elements maybe oriented at arbitrary angles with respect to each other and still be within the spirit of the invention.
As would be clear to those skilled in the art, by extending the antenna array into a third dimension, the performance of the antenna array is improved relative to the size of the tag stock consumed to form the antenna array. By maintaining the same area as a two-dimensional antenna array, the performance of the antenna array is increased without increasing the cost of the tag.
Alternatively, the antenna area may be reduced to achieve the same performance as a two-dimensional antenna array but in a less expensive tag.
While the invention has been described in detail and with reference to specific examples thereof, it will be apparent to one skilled in the art that various changes and modifications can be made therein without departing from the spirit and scope thereof.

Claims (24)

1. An antenna configuration for use in a security tag that optimizes the receipt of a signal issued from an interrogator or reader, said antenna configuration comprising:
a first dipole and a second dipole arranged in a non-parallel nor collinear configuration to form a plane comprising said first and second dipoles; and a third dipole being positioned out of said plane.
2. The antenna configuration of Claim 1 wherein said first, second and third dipoles are tuned to RF frequencies.
3. The antenna configuration of Claim 2 wherein said RF frequencies are UHF
frequencies in the frequency band of approximately 850 MHz-950 MHz.
4. The antenna configuration of Claim 2 wherein said RF frequencies are microwave frequencies in the frequency band of approximately 2.3 Ghz-2.6GHz.
5. The antenna configuration of Claim 1 wherein said third dipole comprises a first antenna stub and a second antenna stub and wherein said plane comprises a first side and a second side and wherein said first and second side are opposite each other, said first antenna stub being positioned out of said plane on said first side and said second antenna stub being positioned out of said plane on said second side.
6. The antenna configuration of Claim 5 wherein said first antenna stub and said second antenna stub are positioned orthogonally to said first and second sides, respectively.
7. The antenna configuration of Claim 6 wherein said first, second and third dipoles are tuned to RF frequencies.
8. The antenna configuration of Claim 7 wherein said RF frequencies are UHF
frequencies in the frequency band of approximately 850 MHz-950 MHz.
9. The antenna configuration of Claim 7 wherein said RF frequencies are microwave frequencies in the frequency band of approximately 2.3 Ghz-2.6GHz.
10. The antenna configuration Claim 1 wherein said first, second and third dipoles are formed as part of a web material and wherein said plane comprises said web material, said first and second dipoles being part of said web material and wherein said third dipole projects away from said web material.
11. The antenna configuration of Claim 10 wherein said third dipole comprises a first antenna stub and a second antenna stub and wherein said web material comprises a first side and a second side and wherein said first and second side are opposite each other, said first antenna stub being positioned out of said web material on said first side and said second antenna stub being positioned out of said web material on said second side.
12. The antenna configuration of Claim 11 wherein said first antenna stub and said second antenna stub are positioned orthogonally to said first and second sides, respectively.
13. The antenna configuration of Claim 11 wherein said first, second and third dipoles are tuned to RF frequencies.
14. The antenna configuration of Claim 13 wherein said RF frequencies are UHF
frequencies in the frequency band of approximately 850 MHz-950 MHz.
15. The antenna configuration of Claim 13 wherein said RF frequencies are microwave frequencies in the frequency band of approximately 2.3 Ghz-2.6GHz.
16. The antenna configuration of Claim 12 wherein said first, second and third dipoles are tuned to RF frequencies.
17. The antenna configuration of Claim 16 wherein said RF frequencies are UHF
frequencies in the frequency band of approximately 850 MHz-950 MHz.
18. The antenna configuration of Claim 16 wherein said RF frequencies are microwave frequencies in the frequency band of approximately 2.3 Ghz-2.6GHz.
19. A method of fabricating a three-dimensional antenna for a security tag for optimizing the receipt of a signal issued from an interrogator or reader, said method comprising the steps of:
(a) providing a web material;
(b) forming a first dipole and a second dipole on said web material, said first dipole and said second dipole formed to be non-parallel nor collinear with respect to each other;
(c) forming a third dipole on said web material;
(d) cutting said web material to free a portion of said third dipole from said web material; and (e) displacing said free portion out of said web material.
20. The method of Claim 19 wherein said step of forming said third dipole on said web material comprises creating a first antenna stub and a second antenna stub and wherein said step of cutting said material comprises cutting said web material to free a first portion of said first antenna stub and to free a second portion of said second antenna stub.
21. The method of Claim 20 wherein said web material has a first side and a second side, said first and second sides being opposite each other, and wherein step of displacing said free portion out of said web material comprises displacing said first and second portions away from said first side or away from said second side.
22. The method of Claim 20 wherein said web material has a first side and a second side, said first and second sides being opposite each other, and wherein step of displacing said free portion out of said web material comprises displacing said first portion away from said first side and said second portion away from said second side.
23. The method of Claim 21 wherein said step of displacing said first and second portions away from said first side or away from said second side comprises displacing said first and second portions orthogonally away from said first side or from said second side.
24. The method of Claim 22 wherein said step of displacing said first portion away from said first side and said second portion away from said second side comprises displacing said first and second portions orthogonally away from said first and second sides respectively.
CA2536386A 2003-08-22 2004-08-11 Security tag with three dimensional antenna array made from flat stock and fabrication method thereof Expired - Fee Related CA2536386C (en)

Applications Claiming Priority (5)

Application Number Priority Date Filing Date Title
US49709903P 2003-08-22 2003-08-22
US60/497,099 2003-08-22
US10/914,432 US7042413B2 (en) 2003-08-22 2004-08-09 Security tag with three dimensional antenna array made from flat stock
US10/914,432 2004-08-09
PCT/US2004/026053 WO2005022690A1 (en) 2003-08-22 2004-08-11 Security tag with three dimensional antenna array made from flat stock and fabrication method thereof

Publications (2)

Publication Number Publication Date
CA2536386A1 CA2536386A1 (en) 2005-03-10
CA2536386C true CA2536386C (en) 2010-10-19

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US (1) US7042413B2 (en)
EP (1) EP1656714B1 (en)
JP (1) JP4173904B2 (en)
KR (1) KR20060103425A (en)
CN (1) CN1839516B (en)
AT (1) ATE415000T1 (en)
AU (1) AU2004302771B2 (en)
CA (1) CA2536386C (en)
DE (1) DE602004017877D1 (en)
ES (1) ES2317048T3 (en)
TW (1) TWI244236B (en)
WO (1) WO2005022690A1 (en)

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