JP4423311B2 - Wireless tag reading / writing device, communication method of the wireless tag reading / writing device, and wireless tag according to the communication method - Google Patents

Description

  The present invention relates to a wireless tag reading / writing device that transmits / receives a signal to / from a wireless tag, a communication method of the wireless tag reading / writing device, and a wireless tag using the communication method, and more particularly, emitted from the wireless tag during communication. The present invention relates to a wireless tag reading / writing device for reducing radio waves, a communication method for the wireless tag reading / writing device, and a wireless tag according to the communication method.

  Conventional wireless tag communication has been performed by electromagnetically coupling the entire antenna of the wireless tag and the antenna of the wireless tag reading / writing device of the inspection apparatus. However, when communication is performed in a state in which a magnetic field is generated and radio waves are emitted during communication and the wireless tags are densely packed, the radio waves received by the wireless tag reader / writer are generated from the wireless tag to be communicated or are close to it. There was a problem that it was not possible to determine whether the tag was generated from the wireless tag. This problem occurs remarkably when a radio wave antenna having a long communicable distance is used.

For example, Japanese Patent Application Laid-Open No. 2003-263611 (hereinafter referred to as Patent Document 1) is an example of a related art related to this. In Patent Document 1, an antenna coil of a reader / writer and an antenna coil of a wireless tag are electromagnetically coupled, and the reader / writer receives an impedance signal that changes according to a change in impedance due to electromagnetic coupling of the antenna of the wireless tag. A technique for determining whether the wireless tag is in a readable / writable state from the impedance signal is described.
JP 2003-263611 A

  However, in the prior art as described in Patent Document 1, no consideration is given to radio waves radiated from the wireless tag, and there is no awareness of the problem of reading and writing a specific wireless tag among the wireless tags in a dense state. . For this reason, in the prior art, there has been a problem that leakage of radio waves in reading and writing information of the wireless tag cannot be reduced.

  In addition, in the inspection of the wireless tag in the manufacturing process of the wireless tag, measures such as providing a shielded version of the radio wave around the wireless tag to be inspected at the time of the inspection have been taken, but the leakage of the radio wave is effectively shielded. It is difficult to do and the work efficiency is not good.

  The present invention has been made in view of the above-described problems. A wireless tag reading / writing device that suppresses emission of unnecessary radio waves when reading and writing a wireless tag, a communication method of the wireless tag reading / writing device, and the An object is to provide a wireless tag according to a communication method.

In order to achieve this object, the present invention relates to a communication antenna, which is an antenna arranged in a non-contact manner, so as to be electromagnetically coupled to a wireless tag antenna that is an antenna of a wireless tag that communicates; A terminal antenna that is disposed in a non-contact manner, is end-terminated, and converts remaining power in the wireless tag and surplus power applied to the wireless tag into thermal energy; and transmits power to the wireless tag And a reader / writer for performing signal processing of signals transmitted and received, and a wireless tag reading and writing device for transmitting and receiving information to and from a wireless tag.

In addition, the present invention electromagnetically couples a communication antenna, which is an antenna for transmitting and receiving electromagnetic waves of a wireless tag reader / writer that communicates with a wireless tag, to a wireless tag antenna that is an antenna of a wireless tag for communication; The terminal antenna, which is an antenna, is electromagnetically coupled to the wireless tag antenna; the wireless tag reading / writing device transmits power to the wireless tag and transmits / receives information to / from the wireless tag ; the terminal antenna includes the remaining power in the wireless tag and the wireless tag The present invention provides a method for communicating with an RFID tag, characterized in that surplus power applied to the device is converted into thermal energy.

Furthermore, the present invention is an antenna that is disposed so as to be in non-contact opposition to a part or all of a closed plane or an open plane formed by a radio tag antenna that is an antenna of a radio tag to communicate and to be electromagnetically coupled to the radio tag antenna. A communication antenna; an antenna that is disposed so as to be in contact with a part or all of a closed plane or an open plane formed by the RFID tag antenna in a non-contact manner and electromagnetically coupled to the RFID tag antenna, and whose end is terminated. and terminating the antenna; and the reader-writer performs signal processing of signals transmitted and received with important electric power to the radio tag; including, a radio tag for communicating with the wireless tag reading writing device, a wireless tag antenna, in a wireless tag the excess power applied to the power and wireless tag residual transferred to end antenna, thermal energy and power of the power and the surplus of termination antenna residual It is converted to provide a wireless tag according to claim.

  According to the present invention, the remaining power in the wireless tag and the surplus power applied to the wireless tag are transferred to the terminal antenna that is electromagnetically coupled, and are converted into heat at the terminal. Therefore, according to the wireless tag reading / writing device and the wireless tag communication method of the present embodiment, there is an effect that unnecessary radio wave radiation can be suppressed when reading and writing the wireless tag.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. Note that in the present invention, the wireless tag reading / writing device includes a device that reads information from a wireless tag, a device that writes information to the wireless tag, or a device that reads and writes information. The wireless tag means a storage medium capable of wireless communication, and usually includes an antenna and an IC chip. The wireless tag may further have a calculation function, and is desirably a portable size, but may be a minute one. The wireless tag is sometimes referred to as RFID (Radio Frequency Identification).

<Outline of Embodiment>
First, an outline of the mechanism of the wireless tag reading / writing device of this embodiment will be described. The wireless tag read / write device according to the present embodiment includes a terminal antenna that is an antenna whose end is terminated, and electromagnetically couples the terminal antenna to the antenna of the wireless tag that communicates.

  With this configuration, the remaining power and surplus power are transferred to this terminal antenna and converted into thermal energy at the terminal part.

  Embodiments for realizing this mechanism will be sequentially described below.

  Next, an outline of the present embodiment will be described. FIG. 9 is a diagram showing an outline of the configuration of the wireless tag reading / writing device of the present embodiment.

  The wireless tag 910 includes a memory 911 that is a storage device, a wireless tag control unit 912 that reads and writes data from and to the memory 911, and a power generation unit 915 that supplies power by rectifying and stabilizing the received modulated electromagnetic wave. A modulation unit 913 that modulates data transmitted from the wireless tag control unit 912 and transmits the modulated data to the wireless tag antenna 916, and a demodulation unit 914 that demodulates the received modulated electromagnetic wave and transmits the modulated electromagnetic wave to the wireless tag control unit 912. .

  The wireless tag read / write device 920 according to the present embodiment includes a communication antenna 921a that is an antenna for transmitting and receiving signals to and from the wireless tag and electromagnetic waves, a termination antenna 921b that is terminated at the end, and a reader / writer 920a that performs signal processing. Including.

  The reader / writer 920a communicates with the wireless tag 910 and a reader / writer control unit 926 that controls hardware to be connected, a modulation unit 922 that modulates data transmitted from the reader / writer control unit 926, and amplifies the modulated signal Then, a transmission amplifier 923 that transmits to the communication antenna 921a, a reception amplifier 924 that amplifies the received modulated electromagnetic wave, a demodulator 925 that demodulates the received modulated signal, and a host device such as a personal computer are connected to exchange data. And an interface 930 for performing. The reader / writer control unit 926 includes a CPU 927 and a ROM 928 and a RAM 929 for storing data.

  Even if the communication antenna 921a and the terminal antenna 921b are a stationary type or a handy type wireless tag reading / writing device housed in and integrated with the wireless tag reading / writing device 920, the wireless tag reading / writing device 920 may be used. And may be housed in a separate housing.

  Next, an outline of the wireless tag reading / writing device of the present embodiment will be described. The wireless tag reading / writing device of the present embodiment is configured to be electromagnetically coupled to a wireless tag antenna that is an antenna of a wireless tag that communicates, and to be electromagnetically coupled to a wireless antenna. And a reader / writer that performs signal processing; and a termination antenna that is an antenna that is disposed in a non-contact manner and has an end that is terminated.

  Further, the wireless tag communication method of the present embodiment electromagnetically couples a communication antenna that is an antenna for transmitting and receiving electromagnetic waves of a wireless tag reading and writing device that communicates with a wireless tag with a wireless tag antenna that is an antenna of the wireless tag that communicates; A terminal antenna, which is an antenna whose end is terminated, is electromagnetically coupled to a wireless tag antenna; the wireless tag reader / writer device transmits and receives information to and from the wireless tag.

  Furthermore, the wireless tag according to the embodiment of the present invention is in contact with a part or all of a closed plane or an open plane formed by a wireless tag antenna that is an antenna of a wireless tag for communication, and is electromagnetically coupled to the wireless tag antenna. A communication antenna, which is an antenna arranged so as to be opposed; a part of or all of a closed plane or an open plane formed by the RFID tag antenna, facing non-contact, and arranged to be electromagnetically coupled to the RFID tag antenna; A wireless tag that communicates with a wireless tag reader / writer, wherein the wireless tag antenna has a remaining power in the wireless tag, including: a terminated antenna that is a terminated antenna; and a reader / writer that performs signal processing. And surplus power is transferred to the terminal antenna. This will be described in detail below.

<Embodiment 1>
Hereinafter, as the first embodiment, the wireless tag reading / writing device includes a terminal antenna as a separate member from the communication antenna, and the terminal antenna is electromagnetically coupled to the antenna of the wireless tag to transfer the remaining power and surplus power to the terminal antenna. An example of conversion into heat energy will be described.

  FIG. 1A is a diagram showing an outline of the wireless tag reading / writing device according to the first embodiment of the present invention. FIG. 1A shows a state in which the wireless tag reading / writing device of the embodiment is viewed from the side.

  As shown in FIG. 1A, the RFID tag reading / writing device of the present embodiment is not partially or entirely of a closed plane or an open plane 109 formed by an RFID tag antenna 102 that is an antenna of an RFID tag 101 for communication. A communication antenna 103 which is an antenna disposed so as to oppose contact and electromagnetically couple with the RFID tag antenna 102; and a part or all of a closed plane or an open plane 109 formed by the RFID tag antenna 102 in a non-contact manner. A terminal antenna 105 which is disposed so as to be electromagnetically coupled to the RFID tag antenna 102 and whose end portion 106 is terminated; and a reader / writer 104 which performs signal processing.

  The communication antenna 103 may form a closed plane or an open plane. The terminal antenna 105 may form a closed plane or an open plane.

  FIG. 1B shows an example of the open plane 107 formed by the communication tag antenna 103. Thus, the open plane formed by the communication tag antenna 103 refers to the plane to which the open figure formed by the communication tag antenna 103 belongs. The open plane is used in the above meaning.

  In addition, the communication tag antenna 103 may form a closed figure.

  FIG. 1C shows an example of the open plane 108 formed by the terminal antenna 105. The terminal antenna 105 may form a closed figure.

  FIG. 1D shows an example of a closed plane 109 formed by the antenna 102 of the RFID tag to be inspected. As described above, the closed plane formed by the antenna 102 of the RFID tag to be inspected refers to the plane to which the closed figure formed by the antenna 102 of the RFID tag to be inspected belongs. The closed plane is used in the above meaning.

  Note that a plane in which the antenna 102 of the wireless tag 102 to be inspected is opened may be formed.

  Next, an arrangement example of the wireless tag reading / writing device of the present embodiment will be described. In FIG. 1A, the communication antenna 103 and the terminal antenna 105 are both disposed below the wireless tag 101 for communication. Furthermore, the following arrangement is also possible.

  FIG. 2A shows an example in which the communication antenna 103 and the terminal antenna 105 are both disposed above the wireless tag 101 that communicates. FIG. 2B illustrates an example in which the communication antenna 103 is disposed above the wireless tag 101 and the terminal antenna 105 is disposed below the wireless tag 101. FIG. 2C illustrates an example in which the communication antenna 103 is disposed below the wireless tag 101 and the terminal antenna 105 is disposed above the wireless tag 101.

  Here, a mechanism for suppressing the emission of unnecessary radio waves by the wireless tag reading / writing device of the first embodiment will be described. The wireless tag inspection method according to the first embodiment is a part of a closed plane or an open plane formed by the communication tag antenna 103 connected to the reader / writer 104 on a part of a closed plane or an open plane formed by the antenna 102 of the RFID tag to be inspected. The parts are arranged to face each other in a non-contact manner. At the same time, the communication tag antenna is electromagnetically coupled to the antenna of the wireless tag. Further, a part of the closed plane or open plane formed by the antenna of the RFID tag to be inspected is opposed to a part of the closed plane or open plane formed by the terminal antenna terminated at the end in a non-contact manner. To arrange. At the same time, the terminal antenna is electromagnetically coupled to the antenna of the wireless tag. Then, information is read from and / or written to the wireless tag with which the wireless tag reading / writing device communicates.

  When a current flows from the reader / writer 104 to the communication tag antenna, electromagnetic coupling is generated with the wireless tag antenna 102 of the wireless tag 101, power is transmitted to the wireless tag antenna 102, and the IC chip of the wireless tag operates. A signal from the IC chip is transmitted to the wireless tag antenna 102, transmitted to the electromagnetically coupled communication tag antenna 103, and then transmitted to the reader / writer 104.

  Almost 50% of the power applied to the communication tag antenna is energy for operating the wireless tag, and the remainder of the applied power is moved to the terminal antenna 105 by electromagnetic coupling, and is converted into heat at the terminal 106. Even when remaining power and surplus power are applied to the communication tag antenna, heat is converted into heat at the terminal 106 through the terminal antenna 105.

  FIG. 3 is a view of the wireless tag reading / writing device according to the first embodiment of the present invention as viewed from above, and particularly shows an inspection process in the manufacturing process of the wireless tag. The wireless tags 201 and 208 are moved close to each other in the direction of the arrow in the inspection process. Reference numeral 202 denotes an antenna that circulates around the IC chip 203 of the wireless tag 201. Although the antenna is a folded dipole antenna in this figure, the effect of the present invention can be obtained regardless of the type of antenna. Reference numeral 205 denotes a communication tag antenna, which is connected to the reader / writer 204. Reference numeral 206 denotes a terminal antenna having a terminal 207 at the end thereof.

  Here, the power applied to the communication tag antenna 205 by the reader / writer 204 moves to the antenna 202 of the wireless tag that is electromagnetically coupled to operate the wireless tag. The remaining power in the wireless tag and the surplus power applied to the wireless tag are transferred to the terminal antenna 206 that is electromagnetically coupled, and are converted into heat at the terminal 207.

  With the configuration as described above, according to the wireless tag reading / writing device and the wireless tag communication method of the present embodiment, the emission of radio waves to the space can be suppressed, and the reader / writer can only receive signals from the wireless tag 201 currently inspected. Can be received.

<Embodiment 2>
Hereinafter, as Embodiment 2, the wireless tag reading / writing device includes an end member as an integral member that is electrically connected to the communication antenna, and the terminal antenna is electromagnetically coupled to the antenna of the wireless tag, thereby remaining power and surplus. An example in which electric power is transferred to a terminal antenna and converted into thermal energy will be described.

  FIG. 4A is a diagram showing an outline of a wireless tag reading / writing device according to the second embodiment of the present invention. FIG. 4A illustrates the wireless tag reading / writing device according to the embodiment as viewed from the side.

  This embodiment is characterized in that the communication tag antenna 303 and the terminal antenna 305 are electrically connected, and other configurations and mechanisms are the same as those in the first embodiment. Reference numeral 301 denotes a wireless tag, which has an antenna 302. The reader / writer 304 is connected to the communication tag antenna 303. The end of the termination antenna 305 has a termination 306. 4A, the communication tag antenna 303 and the terminal antenna 305 are disposed below the wireless tag 301, but may be disposed above the wireless tag as illustrated in FIG. 4B.

  FIG. 5 is a view of the wireless tag reading / writing device according to the second embodiment of the present invention as viewed from above, and represents, for example, an inspection process in the manufacturing process of the wireless tag. The wireless tag 401 includes a wireless tag antenna 402 and an IC chip 403. The communication tag antenna 405 is disposed in contact with the wireless tag so as to go around the IC chip 403 and is connected to the reader / writer 404. The terminal antenna 406 is electrically connected to the communication tag antenna 405, is disposed so as to be laminated with a part of the wireless tag in a non-contact manner with the wireless tag 401, and has a terminal 407 that is terminated at the end.

  With the above configuration, according to the wireless tag reading / writing device and the wireless tag communication method of the present embodiment, the emission of radio waves to the space can be suppressed. In the inspection process, the wireless tag 408 is conveyed in the direction of the arrow in the vicinity of the wireless tag 401 under inspection, but the reader / writer can receive only the signal from the wireless tag 401 currently being inspected. .

<Embodiment 3>
Hereinafter, as Embodiment 3, the RFID tag reading / writing device includes a terminal antenna as a separate member from the communication antenna, the terminal antenna is disposed in contact with the communication antenna in two layers, and further, the communication antenna and the terminal antenna are arranged. An example will be described in which residual power and surplus power are transferred to a terminal antenna and converted into thermal energy by electromagnetically coupling to the antenna of the wireless tag.

  FIG. 6A is a diagram showing an outline of a wireless tag reading / writing device according to the third embodiment of the present invention. FIG. 6A shows the wireless tag reading / writing device according to the embodiment as viewed from the side.

  In the wireless tag read / write device according to the third embodiment, the closed plane or the open plane formed by the communication tag antenna 503 and the closed plane or the open plane formed by the terminal antenna 505 are arranged in contact with each other in two layers. .

  In FIG. 6A, the communication tag antenna 503 and the termination antenna 505 are disposed below the wireless tag 501, but may be disposed above the wireless tag as shown in FIG. 6B.

  A part or all of the closed plane or open plane formed by the communication tag antenna 503 connected to the reader / writer 504 is not contacted with a part or all of the closed plane or open plane formed by the antenna 502 of the wireless tag 501 to be inspected. The communication tag antenna 503 is electromagnetically coupled to the antenna 502 of the wireless tag.

  A part of the closed plane or the open plane formed by the antenna 502 of the wireless tag is arranged so as to face a non-contact portion of the closed plane or the open plane formed by the terminal antenna 505 whose end is terminated. The terminal antenna 505 is electromagnetically coupled to the antenna of the wireless tag. Other configurations and mechanisms are the same as those in the first embodiment.

  The wireless tag 501 has an antenna 502. The communication tag antenna 503 is connected to the reader / writer 504. The end of the termination antenna 505 has a termination 506. In FIG. 5, the communication tag antenna 503 and the termination antenna 505 are both located below the wireless tag 501, but either one or both may be located above the wireless tag.

  FIG. 7 is a perspective view of a wireless tag reading / writing device according to the third embodiment of the present invention. In FIG. 7, the intervals between the wireless tag 601, the communication tag antenna 602, and the termination antenna 604 are set large for easy viewing, but it is desirable that the intervals be narrower. The communication tag antenna 602 is connected to the reader / writer 603, and the end of the termination antenna 604 has a termination 605.

  FIG. 8 is a diagram showing an inspection method when the wireless tags 601 to be inspected are arranged on the sheet 601a. The wireless tag reading / writing device 606 inspects the wireless tag 601 by moving in the direction of the arrow X and sequentially communicating with the wireless tag 601. When one horizontal row is inspected, the sheet 601a moves in the direction of the arrow Y and inspects the next row. Thus, by moving the wireless tag reading / writing device 606, it is possible to inspect the wireless tag more efficiently.

<Effect of this embodiment>
In the present embodiment, the closed plane or open plane formed by the communication tag antenna 602 and the closed plane or open plane formed by the terminal antenna 604 are arranged in contact with each other in two layers and communicate with each other. Therefore, almost all radio waves radiated into the space are converted into heat by the terminal end 605 of the terminal antenna.

  Since it is configured as described above, according to the wireless tag inspection method of the present embodiment, radiation of radio waves to the space is almost suppressed, and the reader / writer can receive only the signal from the wireless tag 601 currently inspected. it can.

<Possibility in the embodiment of the present invention>
Note that the present invention is not limited to the above-described embodiment as it is, and can be embodied by modifying the constituent elements without departing from the scope of the invention in the implementation stage. In addition, various inventions can be formed by appropriately combining a plurality of components disclosed in the embodiment. For example, some components may be deleted from all the components shown in the embodiment. Furthermore, constituent elements over different embodiments may be appropriately combined.

It is a figure showing the outline | summary of the radio | wireless tag reading / writing apparatus of 1st Embodiment. It is the figure which showed the positional relationship of a communication antenna and a termination | terminus antenna. It is the figure which looked at the radio | wireless tag reading / writing apparatus of Embodiment 1 from upper direction. It is a figure showing the outline | summary of the radio | wireless tag reading / writing apparatus of 2nd Embodiment. It is the figure which looked at the radio | wireless tag reading / writing apparatus of 2nd Embodiment from upper direction. It is a figure showing the outline | summary of the radio | wireless tag reading / writing apparatus of 3rd Embodiment. It is a perspective view of the radio | wireless tag reading / writing apparatus of 3rd Embodiment. It is the figure which showed the inspection method when the radio | wireless tag 601 to test | inspect is arranged on the sheet | seat 601a. It is the figure which showed the outline | summary of the structure of the wireless tag reading / writing apparatus of this embodiment.

Explanation of symbols

101: wireless tag,
102: RFID tag antenna,
103: a communication antenna,
104: Reader / writer,
105: Terminal antenna 205: Communication antenna,
206: terminal antenna,
405: a communication antenna,
406: a terminal antenna,
602: a communication antenna,
604: Terminal antenna.

Claims (10)

A communication antenna which is an antenna arranged in a non-contact manner so as to be electromagnetically coupled to a radio tag antenna which is an antenna of a radio tag to communicate;
An antenna that is disposed in a non-contact manner so as to be electromagnetically coupled to the wireless tag antenna, has an end that is terminated, and converts the remaining power in the wireless tag and surplus power applied to the wireless tag into thermal energy. With a terminal antenna;
A reader / writer that transmits power to the wireless tag and performs signal processing of signals to be transmitted and received;
A wireless tag read / write device that transmits and receives information to and from the wireless tag. A communication antenna which is an antenna arranged to be in contact with a part of or all of a closed plane or an open plane formed by a wireless tag antenna which is an antenna of a wireless tag to communicate, and to be electromagnetically coupled to the wireless tag antenna; ;
The radio tag antenna faces some or all the non-contact closing plane or opening plane forming the disposed such that wireless tag antenna and electromagnetically coupled, the end portion is terminated, remaining in the wireless tag A terminal antenna that is an antenna for converting the power of the power and surplus power applied to the wireless tag into thermal energy;
A reader / writer that transmits power to the wireless tag and performs signal processing of signals to be transmitted and received;
A wireless tag read / write device that transmits and receives information to and from the wireless tag.   The wireless tag reading / writing device according to claim 1, wherein the communication antenna forms a closed plane or an open plane.   4. The RFID tag reading / writing device according to claim 1, wherein the terminal antenna forms a closed plane or an open plane.   The RFID tag reading / writing device according to any one of claims 1 to 4, wherein the communication antenna and the terminal antenna are disposed so as to be opposed to each other in two layers. One or both of the communication antenna and the terminal antenna are
The RFID tag reading / writing device according to any one of claims 1 to 5, wherein the RFID tag reading / writing device is disposed above or below a closed plane or an open plane formed by the RFID tag antenna. Electromagnetically coupling a communication antenna that is an antenna for transmitting and receiving electromagnetic waves of a wireless tag reading and writing device that communicates with a wireless tag to a wireless tag antenna that is an antenna of a wireless tag that communicates;
Electromagnetically coupling a terminal antenna, which is an antenna whose end is terminated, to the RFID tag antenna;
A wireless tag reader / writer device transmits power to the wireless tag and transmits / receives information to / from the wireless tag;
The terminal antenna converts residual power in the wireless tag and surplus power applied to the wireless tag into thermal energy;
A wireless tag communication method. The communication antenna is electromagnetically coupled to the RFID tag antenna in a non-contact manner facing part or all of a closed plane or an open plane formed by the RFID tag antenna;
The terminal antenna is electromagnetically coupled to the RFID tag antenna in a non-contact manner facing part or all of a closed plane or an open plane formed by the RFID tag antenna;
The wireless tag communication method according to claim 7. The communication antenna is electromagnetically coupled to the RFID tag antenna in a non-contact manner facing part or all of a closed plane or an open plane formed by the RFID tag antenna;
The terminal antenna is electromagnetically coupled to the RFID tag antenna so as to face two layers in a non-contact manner with a part or all of a closed plane or an open plane formed by the RFID tag antenna;
The wireless tag communication method according to claim 7 or 8, wherein A communication antenna which is an antenna arranged to be in contact with a part of or all of a closed plane or an open plane formed by a wireless tag antenna which is an antenna of a wireless tag to communicate, and to be electromagnetically coupled to the wireless tag antenna; ;
A termination antenna that is a contactlessly opposed part or all of a closed plane or an open plane formed by the RFID tag antenna, and that is disposed so as to be electromagnetically coupled to the RFID tag antenna, and whose end is terminated. ;
A reader / writer that transmits power to the wireless tag and performs signal processing of signals to be transmitted and received;
A wireless tag that communicates with a wireless tag reader / writer,
The wireless tag antenna transfers residual power in the wireless tag and surplus power applied to the wireless tag to the terminal antenna, and the terminal antenna converts the residual power and surplus power into thermal energy. A wireless tag characterized by:

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