JP4174801B2 - Identification tag reader / writer antenna - Google Patents

Identification tag reader / writer antenna Download PDF

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Publication number
JP4174801B2
JP4174801B2 JP2004007967A JP2004007967A JP4174801B2 JP 4174801 B2 JP4174801 B2 JP 4174801B2 JP 2004007967 A JP2004007967 A JP 2004007967A JP 2004007967 A JP2004007967 A JP 2004007967A JP 4174801 B2 JP4174801 B2 JP 4174801B2
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Prior art keywords
resonance circuit
reader
writer
identification tag
auxiliary electrode
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Expired - Fee Related
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JP2004007967A
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JP2005204038A (en
Inventor
英樹 小林
詩朗 杉村
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株式会社エフ・イー・シー
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Description

  The present invention relates to a reader / writer antenna for an identification tag capable of changing a carrier frequency of a radio wave for information transmission from a reader / writer.

  Non-contact type identification tags (so-called IC cards, RFID tags such as IC tags, hereinafter the same) are used to transmit necessary information to and from the reader / writer via radio waves for information transmission from the reader / writer. Can be communicated to.

Therefore, in order to increase the communication distance (information transmission distance) between the reader / writer and the IC chip in the identification tag, a resonance circuit that resonates with the frequency of the information transmission radio wave used (hereinafter referred to as the carrier frequency). It is known that radio waves are relayed through the network (for example, Patent Document 1). That is, the identification tag incorporates a resonance circuit (booster antenna) that electromagnetically couples with the chip antenna of the IC chip, and this resonance circuit is electromagnetically coupled to the excitation coil on the reader / writer side, thereby providing a necessary and sufficient information transmission distance. Can be realized. The resonance circuit in the identification tag is formed in a loop pattern that uses almost the entire area of the identification tag to resonate with the carrier frequency of the radio wave from the reader / writer, and the excitation coil on the reader / writer side also resonates with the carrier frequency. Shall.
JP 2003-187195 A

  According to such a conventional technique, the resonance frequency in the identification tag or the chip antenna resonance frequency of the IC chip varies depending on the material of the base material of the identification tag, so that the intended information transmission distance may not be realized. There was a problem. In such a case, it is conceivable to change the carrier frequency of the radio wave transmitted from the reader / writer side, but in that case, the resonance frequency of the excitation coil on the reader / writer side must also be readjusted. It becomes extremely complicated.

  Accordingly, an object of the present invention is to provide an antenna for a reader / writer of an identification tag that can easily cope with a change in carrier frequency by combining an exciting coil, a resonance circuit, and an auxiliary electrode in view of the problems of the prior art. There is to do.

  The configuration of the present invention for achieving such an object includes an exciting coil connected to a reader / writer, a resonance circuit electromagnetically coupled to the exciting coil, and an auxiliary electrode grounded via a variable capacitor. The gist is to capacitively couple the resonant circuit.

  The excitation coil can be formed in a two-dimensional spiral pattern with one end open, and the stray capacitance between the spiral patterns can be used as a resonance capacitor. The resonance circuit has a one-turn configuration in which both ends are opposed to each other through a gap. It can be formed in a loop pattern, and the gap can be a resonance capacitor. The auxiliary electrode can be formed close to the resonance circuit, and the distance from the resonance circuit can be a coupling capacitor.

  Further, the exciting coil, the resonance circuit, and the auxiliary electrode may be formed as an integrated multilayer printed board, or a ground layer may be added to one side.

  According to the configuration of the invention, the resonance circuit electromagnetically coupled to the exciting coil resonates with the carrier frequency of the radio wave from the reader / writer and operates as a radio wave radiating element. On the other hand, since the auxiliary electrode grounded through the variable capacitor is capacitively coupled to the resonance circuit, the resonance frequency of the resonance circuit can be changed by changing the capacitance of the variable capacitor. That is, when the capacity of the variable capacitor is increased, the resonance frequency of the resonance circuit is decreased, and when the former is decreased, the latter can be increased. The variable capacitor is preferably an element or circuit that can electrically change the capacitance in conjunction with a change in the carrier frequency of the radio wave from the reader / writer, such as a varicap element.

  By forming the exciting coil in a spiral pattern with one end open, the stray capacitance between the spiral patterns can resonate with the carrier frequency as a resonance capacitor. However, the resonance frequency of the excitation coil is preferably set to the maximum value of the carrier frequency, and its Q is set to be sufficiently smaller than that of the resonance circuit that is electromagnetically coupled to the excitation coil.

  A sufficiently large Q can be easily realized by forming the resonance circuit in a one-turn loop pattern in which both ends face each other through a gap. This is because the resistance value of the one-turn loop pattern can be sufficiently reduced by increasing the conductor width.

  By forming the auxiliary electrode close to the resonance circuit, the distance from the resonance circuit can be used as a coupling capacitor. The auxiliary electrode is preferably formed on the same substrate as the resonant circuit.

  The exciting coil, the resonance circuit, and the auxiliary electrode are formed on separate substrates, and can be combined into a very compact structure by forming an integral multilayer printed board. The exciting coil substrate can be a ceramic substrate, for example, and the necessary stray capacity for resonance can be easily secured. The resonant circuit and auxiliary electrode substrate can be a flexible substrate made of a polyimide film, for example. Thus, it is possible to stably adhere to the exciting coil substrate.

  The ground layer reduces the body effect on the exciting coil, the resonance circuit, and the auxiliary electrode, and improves the stability of the overall operation.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  The reader / writer antenna of the identification tag includes an exciting coil 11, a resonance circuit 12, and an auxiliary electrode 13 (FIGS. 1 and 2). 2A to 2C are plan views of the substrate 21 for the exciting coil 11, the resonance circuit 12, the substrate 22 for the auxiliary electrode 13, and the substrate 23 for the ground layer 14, respectively.

  The exciting coil 11 is formed on the substrate 21 as a circular plural-turn two-dimensional spiral pattern. One end on the inner side of the exciting coil 11 is an open end, and one end on the outer side is drawn out to a through hole 21 a at one end of the substrate 21. In addition, another through hole 21b that is paired with the through hole 21a is formed at the other end of the substrate 21.

  The resonance circuit 12 is formed as a circular one-turn loop pattern on a substrate 22 having the same shape and size as the substrate 21. The resonant circuit 12 is formed with a sufficiently large width w, and both ends thereof are opposed to each other with a gap g interposed therebetween.

  The auxiliary electrode 13 is formed as a substantially arc-shaped pattern concentric with the resonance circuit 12 on the substrate 22 for the resonance circuit 12 in the vicinity of the outer periphery of the resonance circuit 12. A space d is formed between the auxiliary electrode 13 and the resonance circuit 12, and the auxiliary electrode 13 is drawn out to the through hole 22a. The through hole 22a corresponds to the through hole 21b on the substrate 21.

  A ground layer 14 formed on a substrate 23 having the same shape and size as the substrates 21 and 22 is added to the exciting coil 11, the resonance circuit 12, and the auxiliary electrode 13. The ground layer 14 is formed as a ground pattern covering almost the entire surface of the substrate 23. A pair of through holes 23a and 23b corresponding to the through holes 21a and the through holes 21b and 22a are formed at both ends of the substrate 23, respectively. Yes. The through holes 23a and 23b are each provided with a land 23c.

  The substrate 21 for the exciting coil 11 is, for example, a rigid ceramic substrate, and the other substrates 22, 23 are, for example, flexible polyimide film substrates. The substrates 21, 22, and 23 are integrally laminated with the substrates 23 and 22 disposed on both sides of the substrate 21. Therefore, the excitation coil 11, the resonance circuit 12, and the auxiliary electrode 13 are integrated with each other to add the ground layer 14. It is a multilayer printed board. At this time, it is assumed that the exciting coil 11 and the resonance circuit 12 overlap each other at substantially the same position (FIG. 3). Further, the through hole 21a that pulls out one end of the exciting coil 11 is electrically connected to the through hole 23a of the substrate 23, and the through hole 22a that pulls out the auxiliary electrode 13 passes through the through hole 21b of the substrate 21 to the through hole 23b. Electrically connected. That is, the lands 23c and 23c attached to the through holes 23a and 23b can be used as the external terminal T1 for the exciting coil 11 and the external terminal T2 for the auxiliary electrode 13, respectively.

  The exciting coil 11 is connected to the main body RW1 of the reader / writer RW via the external terminal T1 and the coupling capacitor Co (FIG. 4). The auxiliary electrode 13 is grounded via a variable capacitor Cv connected to the external terminal T2. In FIG. 4, in the exciting coil 11, the stray capacitance Cs between the spiral patterns on the substrate 21 is a resonance capacitor, and resonates substantially at the maximum value of the carrier frequency from the main body RW1. The resonance circuit 12 has a resonance capacitor Cg formed by a gap g at both ends, and is electromagnetically coupled to the exciting coil 11 via a mutual inductance M. Further, the distance d between the exciting coil 11 and the auxiliary electrode 13 forms a coupling capacitor Cd for capacitively coupling the two.

  The main body RW1 of the reader / writer RW includes both a power amplifying unit that outputs radio waves for information transmission from the reader / writer RW and an information input unit that reads information transmitted from the IC chip P1 in the identification tag P. Shall be included. However, the information input unit can read information from the IC chip P1 when the IC chip P1 is operated by the radio wave from the reader / writer RW and the radio wave from the reader / writer RW is load-modulated. It is assumed that the IC chip P1 is operated by being positioned substantially on the center line of the resonance circuit 12 (FIG. 1).

  The resonance circuit 12 has an outer diameter of 3.0 mm, an inner diameter of 1.0 mm, a width w = 1.0 mm, a gap g = 0.05 mm, and a four-turn spiral of a size that overlaps the excitation coil 11 within the width w of the resonance circuit 12. FIG. 5 shows an example of change data of the standing wave ratio SWR viewed from the main body RW1 side of the reader / writer RW when the variable capacitor Cv is changed from 0.5 to 3 pF as a pattern. However, in FIG. 5, curves (1) to (5) sequentially show the case where the variable capacitor Cv is changed from the minimum value to the maximum value. That is, the variable capacitor Cv = 0.5-3 pF can be smoothly changed to the resonance frequency F = 2440-2460 MHz as the whole antenna. At this time, the resonance frequency F1 of the exciting coil 11 is approximately 2470 MHz.

  Therefore, the reader / writer RW changes the carrier frequency of the radio wave from the main body RW1 and changes the capacitance of the variable capacitor Cv in conjunction with it to match the resonance frequency F of the resonance circuit 12 with the carrier frequency. The performance of the resonant circuit 12 as a radiating element can be maintained at the maximum. That is, the reader / writer RW can change the resonance frequency of a chip antenna on the IC chip P1 or a resonance circuit (booster antenna) (not shown) in the identification tag P depending on the material of the base material on which the identification tag P is formed. The information transmission distance for the identification tag P can be maintained at the maximum. This is because the reader / writer RW can find the carrier frequency that provides the best response from the IC chip P1, and can automatically realize information transmission using radio waves of the carrier frequency.

Other embodiments

  The exciting coil 11 and the resonance circuit 12 may be replaced with another arbitrary two-dimensional shape such as a polygon or an ellipse instead of a circle. Further, the shape and size of the exciting coil 11 and the resonance circuit 12 and the relative positional relationship between them can be arbitrarily changed as long as a predetermined electromagnetic coupling can be realized between them.

  Further, the substrate 21 for the excitation coil 11, the resonance circuit 12, the substrate 22 for the auxiliary electrode 13, and the substrate 23 for the ground layer 14 can be stacked in different order (FIGS. 6A and 6B). ). However, FIG. 6A shows the stacking order of FIG. Further, in the stacking order of FIG. 6B, the substrate 22 can be omitted by setting one of the substrates 21 and 23 as a double-sided printed circuit board (FIGS. 6C and 6D). In the stacking order of FIG. 6A, the substrate 21 can be omitted (not shown). 6A to 6D, the ground layer 14 may be disposed on the upper surface instead of the lower surface of the multilayer printed board including the exciting coil 11, the resonance circuit 12, and the auxiliary electrode 13. The ground layer 14 may be omitted.

  Each conductor pattern including the exciting coil 11, the resonance circuit 12, and the auxiliary electrode 13 can be formed by any method for printed wiring boards such as printing and etching.

Whole structure exploded perspective view Main part configuration diagram Overall configuration skeleton diagram Equivalent electrical circuit diagram Characteristic data diagram Cross-sectional explanatory drawing showing another embodiment

Explanation of symbols

P ... Identification tag RW ... Reader / writer g ... Gap d ... Spacing Cg, Cd ... Capacitor Cs ... Stray capacity Cv ... Variable capacitor 11 ... Excitation coil 12 ... Resonant circuit 13 ... Auxiliary electrode 14 ... Ground layer

Patent Applicant FCE Co., Ltd.
Attorney Tadaaki Matsuda, Attorney

Claims (6)

  1. An excitation coil connected to the reader / writer, a resonance circuit electromagnetically coupled to the excitation coil, and an auxiliary electrode grounded through a variable capacitor, the auxiliary electrode being capacitively coupled to the resonance circuit An identification tag reader / writer antenna.
  2. 2. The identification tag reader / writer antenna according to claim 1, wherein the exciting coil is formed in a two-dimensional spiral pattern with one end open, and a stray capacitance between the spiral patterns is used as a resonance capacitor.
  3.   3. The reader / writer for an identification tag according to claim 1, wherein the resonance circuit is formed in a one-turn loop pattern in which both ends are opposed to each other through a gap, and the gap is used as a resonance capacitor. Antenna.
  4. 4. The reader / writer for an identification tag according to claim 1, wherein the auxiliary electrode is formed close to the resonance circuit, and a coupling capacitor is provided between the auxiliary electrode and the resonance circuit. Antenna.
  5.   5. The reader / writer antenna for an identification tag according to claim 1, wherein the exciting coil, the resonance circuit, and the auxiliary electrode are formed as an integrated multilayer printed board.
  6.   6. The identification tag reader / writer antenna according to claim 5, wherein a ground layer is added to one side.
JP2004007967A 2004-01-15 2004-01-15 Identification tag reader / writer antenna Expired - Fee Related JP4174801B2 (en)

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JP2004007967A JP4174801B2 (en) 2004-01-15 2004-01-15 Identification tag reader / writer antenna

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JP4174801B2 true JP4174801B2 (en) 2008-11-05

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