WO2011048905A1 - Transmitting/receiving device and wireless tag reader - Google Patents

Transmitting/receiving device and wireless tag reader Download PDF

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Publication number
WO2011048905A1
WO2011048905A1 PCT/JP2010/066288 JP2010066288W WO2011048905A1 WO 2011048905 A1 WO2011048905 A1 WO 2011048905A1 JP 2010066288 W JP2010066288 W JP 2010066288W WO 2011048905 A1 WO2011048905 A1 WO 2011048905A1
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Prior art keywords
circuit
transmission
reception
radiating element
feeding
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PCT/JP2010/066288
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French (fr)
Japanese (ja)
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家木勉
酒井賢
加藤登
白木浩司
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株式会社村田製作所
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Publication of WO2011048905A1 publication Critical patent/WO2011048905A1/en

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    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06K—GRAPHICAL DATA READING; PRESENTATION OF DATA; RECORD CARRIERS; HANDLING RECORD CARRIERS
    • G06K7/00—Methods or arrangements for sensing record carriers, e.g. for reading patterns
    • G06K7/10—Methods or arrangements for sensing record carriers, e.g. for reading patterns by electromagnetic radiation, e.g. optical sensing; by corpuscular radiation
    • G06K7/10009—Methods or arrangements for sensing record carriers, e.g. for reading patterns by electromagnetic radiation, e.g. optical sensing; by corpuscular radiation sensing by radiation using wavelengths larger than 0.1 mm, e.g. radio-waves or microwaves
    • G06K7/10316—Methods or arrangements for sensing record carriers, e.g. for reading patterns by electromagnetic radiation, e.g. optical sensing; by corpuscular radiation sensing by radiation using wavelengths larger than 0.1 mm, e.g. radio-waves or microwaves using at least one antenna particularly designed for interrogating the wireless record carriers
    • G06K7/10346—Methods or arrangements for sensing record carriers, e.g. for reading patterns by electromagnetic radiation, e.g. optical sensing; by corpuscular radiation sensing by radiation using wavelengths larger than 0.1 mm, e.g. radio-waves or microwaves using at least one antenna particularly designed for interrogating the wireless record carriers the antenna being of the far field type, e.g. HF types or dipoles
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06K—GRAPHICAL DATA READING; PRESENTATION OF DATA; RECORD CARRIERS; HANDLING RECORD CARRIERS
    • G06K7/00—Methods or arrangements for sensing record carriers, e.g. for reading patterns
    • G06K7/10—Methods or arrangements for sensing record carriers, e.g. for reading patterns by electromagnetic radiation, e.g. optical sensing; by corpuscular radiation
    • G06K7/10009—Methods or arrangements for sensing record carriers, e.g. for reading patterns by electromagnetic radiation, e.g. optical sensing; by corpuscular radiation sensing by radiation using wavelengths larger than 0.1 mm, e.g. radio-waves or microwaves
    • G06K7/10316—Methods or arrangements for sensing record carriers, e.g. for reading patterns by electromagnetic radiation, e.g. optical sensing; by corpuscular radiation sensing by radiation using wavelengths larger than 0.1 mm, e.g. radio-waves or microwaves using at least one antenna particularly designed for interrogating the wireless record carriers
    • 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
    • H01Q1/2216—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 interrogator/reader equipment
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q1/00—Details of, or arrangements associated with, antennas
    • H01Q1/52—Means for reducing coupling between antennas; Means for reducing coupling between an antenna and another structure
    • 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
    • H01Q21/28—Combinations of substantially independent non-interacting antenna units or systems
    • 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
    • H01Q9/0407—Substantially flat resonant element parallel to ground plane, e.g. patch antenna
    • 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
    • H01Q9/0407—Substantially flat resonant element parallel to ground plane, e.g. patch antenna
    • H01Q9/0428—Substantially flat resonant element parallel to ground plane, e.g. patch antenna radiating a circular polarised wave
    • H01Q9/0435—Substantially flat resonant element parallel to ground plane, e.g. patch antenna radiating a circular polarised wave using two feed points

Definitions

  • the present invention relates to a transmission / reception device, and more particularly to a wireless tag reader used in an RFID (Radio Frequency Identification) system.
  • RFID Radio Frequency Identification
  • Patent Document 1 and Patent Document 2 are disclosed regarding a wireless tag reader.
  • Patent Document 1 discloses a configuration in which a circulator is provided and an antenna is shared for transmission and reception.
  • FIG. 1 is an overall schematic diagram of the wireless tag communication system disclosed in Patent Document 1.
  • the wireless tag communication system S includes an interrogator 100 and a wireless tag T as a responder corresponding thereto.
  • the wireless tag T includes a wireless tag circuit element To including an antenna 51 and an IC circuit unit 52.
  • the interrogator 100 transmits / receives signals to / from the antenna 51 of the RFID circuit element To by wireless communication, and the IC circuit section 52 of the RFID circuit element To via the antenna 1.
  • a high-frequency circuit 2 for accessing (reading or writing), a signal processing circuit 3 for processing a signal read from the RFID circuit element To, and a control circuit 4 are provided.
  • Patent Document 2 shows a configuration in which different antennas (transmission antenna and reception antenna) are used for transmission and reception.
  • an object of the present invention is to provide a transmission / reception device that is isolated without using a circulator and is miniaturized as a whole, and a wireless tag reader having the same.
  • the transmitting / receiving apparatus of the present invention A transmitting / receiving radiating element having a feeding point; and a feeding circuit coupled to the feeding point of the radiating element;
  • the radiating element transmits a transmission signal in a first polarization direction to a communication partner, and receives a reception signal from the communication partner in a second polarization direction orthogonal or substantially orthogonal to the first polarization direction. Configure to receive.
  • the shape of the radiating element is, for example, a line symmetry.
  • the feeding point of the radiating element and the feeding circuit are coupled by, for example, electromagnetic coupling.
  • a matching circuit connected to the feeding circuit, an antenna device is configured by the radiating element, the feeding circuit and the matching circuit, and a frequency band in which a gain of the antenna device is obtained is determined by the matching circuit Good.
  • the antenna device may be configured by the radiating element and the feeding circuit, and a frequency band in which a gain of the antenna device is obtained may be determined by the feeding circuit.
  • the feed points are, for example, a balanced feed point for transmission and a balanced feed point for reception, and the balanced feed point for transmission and the balanced feed point for reception are arranged in an orthogonal relationship or a substantially orthogonal relationship. May be.
  • the wireless tag reading device of the present invention includes the transmission / reception device having the above-described configuration
  • the communication partner of the transmission / reception apparatus is a wireless tag including an integrated circuit for recording information and an antenna for transmitting information recorded in the integrated circuit or receiving information recorded in the integrated circuit, Transmission signal generating means for generating the transmission signal; Received signal processing means for obtaining information of the wireless tag from the received signal; Have
  • the polarization direction can be easily or almost orthogonal between transmission and reception.
  • the transmission / reception apparatus can be further downsized.
  • the feeding point is a balanced feeding point for transmission and a balanced feeding point for reception, and the balanced feeding point for transmission and the balanced feeding point for reception are arranged in an orthogonal relationship or a substantially orthogonal relationship with each other.
  • the polarization direction can be made orthogonal or almost orthogonal between transmission and reception.
  • FIG. 1 is an overall schematic diagram of a wireless tag communication system of Patent Document 1.
  • FIG. 1 is a block diagram of a wireless tag reader 101 according to a first embodiment. It is a figure which shows the shape of the radiation element 11, and the position of a feeding point. It is a figure which shows the three planar shapes of the radiation element 11 which concern on 2nd Embodiment.
  • FIGS. 5A and 5B are block diagrams of two wireless tag readers 102 and 103 according to the third embodiment. It is a block diagram of the wireless tag system which concerns on 4th Embodiment.
  • FIG. 2 is a block diagram of the wireless tag reader 101 according to the first embodiment.
  • the wireless tag reader 101 includes a baseband circuit 14, a transmission / reception circuit 13, a transmission power supply circuit 12T, a reception power supply circuit 12R, and a radiation element 11.
  • the transmission / reception circuit 13 includes a transmission circuit 13T and a reception circuit 13R.
  • the transmission circuit 13T amplifies the transmission signal output from the baseband circuit 14 and supplies the transmission signal to the transmission power supply circuit 12T.
  • the reception circuit 13R outputs a reception signal to the baseband circuit 14 via the reception power feeding circuit 12R.
  • the transmission power supply circuit 12T also serves as a matching circuit for the transmission circuit 13T and the radiation element 11.
  • the reception power supply circuit 12R also serves as a matching circuit for the reception circuit 13R and the radiation element 11.
  • the transmission power supply circuit 12T includes inductors L11 and L12 and capacitors C11 and C12.
  • the inductors L11 and L12 are arranged for electromagnetic coupling with the radiating element 11.
  • the reception power supply circuit 12R is configured by inductors L21 and L22 and capacitors C21 and C22, and the inductors L21 and L22 are arranged for electromagnetic coupling with the radiating element 11.
  • two capacitors (C11, C12) (C21, C22) and two inductors (L11, L12) (L21, L22) are provided to form balanced power supply circuits.
  • FIG. 3 is a diagram showing the shape of the radiating element 11 and the position of the feeding point.
  • an opening A is provided at the center of the rectangular radiating element 11, and positions where the opening A is sandwiched in the vertical direction are determined as transmission feed points FPt and FPt. Further, the positions where the opening A is sandwiched in the horizontal direction are defined as the receiving power supply points FPr and FPr.
  • the inductors L11 and L12 are electromagnetically coupled to the transmission feed points FPt and FPt, and the inductors L21 and L22 are electromagnetically coupled to the reception feed points FPr and FPr.
  • the transmission wave is excited in the radial direction from the transmission feed points FPt and FPt and away from each other, as indicated by the dashed arrows.
  • the received wave is excited in the radial direction and away from the reception feed points FPr and FPr. In this way, it acts as a balanced feeding patch antenna. Therefore, the transmission signal is transmitted in the vertical direction (first polarization direction), and the reception signal is received in the horizontal direction (second polarization direction orthogonal to the first polarization direction). That is, since the transmission signal and the reception signal are in an orthogonal relationship, isolation is ensured from each other.
  • the dimensions (that is, the lengths of the two sides) of the radiating element are different between the excitation direction of the transmission wave and the excitation direction of the reception wave. This is because the dimension of the excitation direction of the transmission wave is made shorter than the dimension of the excitation direction of the reception wave in accordance with the fact that the transmission frequency is higher than the reception frequency.
  • the gain as a transmission antenna and the gain as a reception antenna can be made uniform.
  • an opening A is provided at an intermediate position between two feeding points that perform balanced feeding, but even if this opening A is not present, that is, even if the conductor surface is continuous, it has an effect on the excitation of the radiating element. Not give. Therefore, the opening A may not be provided.
  • isolation can be ensured without using a circulator, so that the transmitter / receiver can be downsized.
  • the polarization direction can be easily orthogonalized between transmission and reception. Furthermore, if the balanced feeding point for transmission and the balanced feeding point for reception are arranged in an orthogonal relationship with each other, the polarization directions can be easily orthogonalized between transmission and reception.
  • the two inductors of the transmission power supply circuit 12T also functioning as a matching circuit shown in FIG. 2 are coupled with the winding direction reversed. For this reason, the magnetic fields generated by the two inductors are canceled out, the electrode length for obtaining a desired inductance value is lengthened, and as a result, the Q value is lowered. That is, since the sharpness of the resonance characteristic becomes loose, it is possible to widen the band near the resonance frequency.
  • the two inductors are coupled with the winding direction reversed. For this reason, the received signal can be widened in the vicinity of the resonance frequency.
  • the transmitting circuit 13T, the receiving circuit 13R, and the radiating element 11 are Match each one. Therefore, it is sufficient if the size is sufficient to obtain a predetermined gain, and the overall size can be reduced.
  • FIG. 4 is a diagram showing three planar shapes of the radiating element 11 according to the second embodiment.
  • a transmission signal is transmitted in the first polarization direction, and reception is performed in the second polarization direction orthogonal to the first polarization direction. If the signal can be received, the radiating element can take various shapes.
  • the transmission elements FPt and FPt and the reception feed point are set so that the radiating element 11 has an elliptical shape and the excitation directions of the transmission wave and the reception wave are the short axis direction and the long axis direction of the ellipse.
  • FPr and FPr are defined.
  • the radiating element 11 has a rhombus shape, and the transmission feed points FPt, FPt, FPt and reception feeding points FPr and FPr are defined.
  • FIG. 4A the transmission elements FPt and FPt and the reception feed point are set so that the radiating element 11 has an elliptical shape and the excitation directions of the transmission wave and the reception wave are the short axis direction and the long axis direction of the ellipse.
  • FPr and FPr are defined.
  • the radiating element 11 has a rhombus shape, and the transmission feed points FPt, FPt, FPt and reception feeding points FPr and FPr are
  • the radiating element 11 has a cross shape, and the transmission feed points FPt and FPt are such that the excitation directions of the transmission wave and the reception wave are the first axis direction and the second axis direction of the cross. And reception feed points FPr and FPr.
  • FIG. 4 (A) and 4 (B) act as a balanced feeding patch antenna.
  • the radiating element in FIG. 4C substantially functions as a dipole antenna.
  • each opening A may not be provided in FIGS. 4A, 4B, and 4C.
  • FIGS. 5A and 5B are block diagrams of two wireless tag readers 102 and 103 according to the third embodiment.
  • the third embodiment is an example in which unbalanced power feeding is performed.
  • 5A includes a baseband circuit 14, a transmission / reception circuit 16, a transmission power supply circuit 15T, a reception power supply circuit 15R, and a radiating element 11.
  • the transmission / reception circuit 16 includes a transmission circuit 16T and a reception circuit 16R.
  • the transmission circuit 16T amplifies the transmission signal output from the baseband circuit 14 in an unbalanced manner, and supplies the unbalanced transmission signal to the transmission power supply circuit 15T.
  • the reception circuit 16R inputs the reception signal unbalanced via the reception power supply circuit 15R and outputs it to the baseband circuit 14.
  • the transmission power supply circuit 15T includes a capacitor C11 and two inductors L11 and L12.
  • the transmission power supply circuit 15T supplies unbalanced power to the radiating element 11 by electromagnetic coupling between the inductors L11 and L12 and the radiating element 11.
  • the receiving power supply circuit 15R is composed of a capacitor C21 and two inductors L21 and L22, and supplies unbalanced power to the radiating element 11 by electromagnetic coupling between the inductors L21 and L22 and the radiating element 11.
  • the positional relationship of the feeding point with respect to the radiating element 11 is the same as that shown in the first and second embodiments.
  • the transmission power supply circuit 17T includes a capacitor C11 and an inductor L11, and supplies unbalanced power to the radiation element 11 by electromagnetic coupling between the inductor L11 and the radiation element 11.
  • the reception power supply circuit 17R is composed of a capacitor C21 and an inductor L21, and performs unbalanced power supply to the radiating element 11 by electromagnetic coupling between the inductor L21 and the radiating element 11.
  • the feeding point on the radiating element 11 by the inductor L11 is one of the two feeding points FPt and FPt in the example shown in FIG.
  • the feeding point on the radiation element 11 by the inductor L21 is one of the two feeding points FPr and FPr in the example shown in FIG.
  • the center of the radiating element 11 is grounded without providing the opening A at the center of the radiating element 11.
  • FIG. 6 is a configuration diagram of a wireless tag system according to the fourth embodiment.
  • This wireless tag system includes a wireless tag reader 101 and a wireless tag 201.
  • the wireless tag reader 101 is the same as that shown in the first embodiment.
  • the wireless tag 201 includes a baseband circuit 24, a transmission / reception circuit 23, a transmission / reception power supply circuit 22, and a radiation element 21.
  • the wireless tag reader 101 transmits a preamble radio wave, a radio wave modulated with a command bit string, and an unmodulated radio wave in this order.
  • the wireless tag 201 accumulates energy necessary for initial operation in the preamble part, demodulates and interprets the subsequent command bit string, and returns (transmits) information by putting a response on the reflected wave in the unmodulated carrier part. .
  • the wireless tag reader 101 reads the response from the wireless tag 201, demodulates and interprets it, and performs necessary processing.
  • the transmission power feeding circuit is configured to perform both the matching between the radiating element and the transmission circuit and the power feeding to the radiating element.
  • the power feeding circuit and the matching circuit may be provided separately. . That is, a feeding circuit for a transmission signal that is electromagnetically coupled to the radiating element may be provided, and a matching circuit may be provided between the feeding circuit and the transmission circuit.
  • a power supply circuit for a reception signal that is electromagnetically coupled to the radiating element may be provided, and a matching circuit may be provided between the power supply circuit and the reception circuit.
  • the matching circuit can take various configurations.
  • the matching circuit may be configured by including an inductor and a capacitor, or the matching circuit may be configured by one or a plurality of inductors.
  • the example in which the polarization direction of the transmission signal and the polarization direction of the reception signal are orthogonal to each other has been shown.
  • it is not necessarily orthogonal (90 °). That is, the polarization direction of the transmission signal and the polarization direction of the reception signal may be substantially orthogonal.

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Abstract

A wireless tag reader (101) is provided with a base band circuit (14), a transmitting/receiving circuit (13), a transmission feed circuit (12T), a reception feed circuit (12R), and a radiation element (11). A transmitting circuit (13T) power-amplifies transmitting signals outputted from the base band circuit (14) and supplies the transmitting signals to the transmission feed circuit (12T). A receiving circuit (13R) outputs receiving signals to the base band circuit (14) via the reception feed circuit (12R). For instance, the rectangular radiation element (11) has an opening in the center portion thereof, and the positions that sandwich the opening in the longitudinal direction are specified as transmission feed points (FPt, FPt). The positions that sandwich the opening in the lateral direction are specified as reception feed points (FPr, FPr). Inductors (L11, L12) are coupled to the transmission feed points (FPt, FPt) by electromagnetic field coupling, and inductors (L21, L22) are coupled to the reception feed points (FPr, FPr) by electromagnetic field coupling.

Description

送受信装置及び無線タグ読み取り装置Transceiver and RFID tag reader
　この発明は、送受信装置、特に、ＲＦＩＤ（Radio Frequency Identification）システムに用いられる無線タグ読み取り装置に関するものである。 The present invention relates to a transmission / reception device, and more particularly to a wireless tag reader used in an RFID (Radio Frequency Identification) system.
　無線タグ読み取り装置に関して特許文献１，特許文献２が開示されている。
　特許文献１には、サーキュレータを備えて、送信と受信とでアンテナを共用するようにした構成が示されている。 Patent Document 1 and Patent Document 2 are disclosed regarding a wireless tag reader.
Patent Document 1 discloses a configuration in which a circulator is provided and an antenna is shared for transmission and reception.
　図１は特許文献１の無線タグ通信システムの全体概略図である。図１において、無線タグ通信システムＳは、質問器１００と、これに対応する応答器としての無線タグＴとから構成される。無線タグＴは、アンテナ５１とＩＣ回路部５２とを備えた無線タグ回路素子Ｔoを有している。質問器１００は、無線タグ回路素子Ｔoの上記アンテナ５１との間で無線通信により信号の授受を行う送受兼用のアンテナ１と、このアンテナ１を介し上記無線タグ回路素子ＴoのＩＣ回路部５２へアクセスする（読み取り又は書き込みを行う）ための高周波回路２と、無線タグ回路素子Ｔoから読み出された信号を処理するための信号処理回路３と、制御回路４とを有する。 FIG. 1 is an overall schematic diagram of the wireless tag communication system disclosed in Patent Document 1. In FIG. 1, the wireless tag communication system S includes an interrogator 100 and a wireless tag T as a responder corresponding thereto. The wireless tag T includes a wireless tag circuit element To including an antenna 51 and an IC circuit unit 52. The interrogator 100 transmits / receives signals to / from the antenna 51 of the RFID circuit element To by wireless communication, and the IC circuit section 52 of the RFID circuit element To via the antenna 1. A high-frequency circuit 2 for accessing (reading or writing), a signal processing circuit 3 for processing a signal read from the RFID circuit element To, and a control circuit 4 are provided.
　特許文献２には、送信と受信とで別のアンテナ（送信アンテナと受信アンテナ）を用いる構成が示されている。 Patent Document 2 shows a configuration in which different antennas (transmission antenna and reception antenna) are used for transmission and reception.
特開２００７－２２８２５４号公報JP 2007-228254 A 特開２００６－２３８２８２号公報JP 2006-238282 A
　しかし、特許文献１のようにサーキュレータを用いると、送受信装置が大型になってしまう。一方、特許文献２のように送信アンテナと受信アンテナとを個別に設けると、複数のアンテナ間のアイソレーションを保つために一定の間隔が必要となり、送受信装置が大型になってしまう。 However, when a circulator is used as in Patent Document 1, the transmission / reception device becomes large. On the other hand, when the transmitting antenna and the receiving antenna are individually provided as in Patent Document 2, a certain interval is required to maintain isolation between the plurality of antennas, and the transmission / reception apparatus becomes large.
　そこで、この発明の目的は、サーキュレータを用いることなくアイソレーションを確保し、且つ全体に小型化した送受信装置、及びそれを備えた無線タグ読み取り装置を提供することにある。 Accordingly, an object of the present invention is to provide a transmission / reception device that is isolated without using a circulator and is miniaturized as a whole, and a wireless tag reader having the same.
　この発明の送受信装置は、
　給電点を有する送受兼用の放射素子と、放射素子の給電点に結合する給電回路と、を有し、
　前記放射素子は、通信相手に対して第１の偏波方向で送信信号を送信し、第１の偏波方向とは直交またはほぼ直交する第２の偏波方向で前記通信相手から受信信号を受信するように構成する。 The transmitting / receiving apparatus of the present invention
A transmitting / receiving radiating element having a feeding point; and a feeding circuit coupled to the feeding point of the radiating element;
The radiating element transmits a transmission signal in a first polarization direction to a communication partner, and receives a reception signal from the communication partner in a second polarization direction orthogonal or substantially orthogonal to the first polarization direction. Configure to receive.
　前記放射素子の形状は例えば線対称形である。 The shape of the radiating element is, for example, a line symmetry.
　前記放射素子の給電点と前記給電回路とは、例えば電磁界結合によって結合されている。 The feeding point of the radiating element and the feeding circuit are coupled by, for example, electromagnetic coupling.
　前記給電回路に接続された整合回路を備え、前記放射素子、前記給電回路及び前記整合回路によりアンテナ装置が構成され、前記アンテナ装置の利得の得られる周波数帯域が前記整合回路により定められていてもよい。 A matching circuit connected to the feeding circuit, an antenna device is configured by the radiating element, the feeding circuit and the matching circuit, and a frequency band in which a gain of the antenna device is obtained is determined by the matching circuit Good.
　前記放射素子及び前記給電回路によりアンテナ装置が構成され、前記アンテナ装置の利得の得られる周波数帯域が前記給電回路により定められていてもよい。 The antenna device may be configured by the radiating element and the feeding circuit, and a frequency band in which a gain of the antenna device is obtained may be determined by the feeding circuit.
　前記給電点は、例えば送信用の平衡給電点及び受信用の平衡給電点であり、前記送信用の平衡給電点と前記受信用の平衡給電点は、互いに直交関係またはほぼ直交関係で配置されていてもよい。 The feed points are, for example, a balanced feed point for transmission and a balanced feed point for reception, and the balanced feed point for transmission and the balanced feed point for reception are arranged in an orthogonal relationship or a substantially orthogonal relationship. May be.
　この発明の無線タグ読み取り装置は、前記構成の送受信装置を備え、
　前記送受装置の通信相手は、情報を記録する集積回路及び前記集積回路に記録された情報を送信又は前記集積回路へ記録する情報を受信するアンテナを備えた無線タグであり、
　前記送信信号を生成する送信信号生成手段と、
　前記受信信号から、前記無線タグの情報を取得する受信信号処理手段と、
を有する。 The wireless tag reading device of the present invention includes the transmission / reception device having the above-described configuration,
The communication partner of the transmission / reception apparatus is a wireless tag including an integrated circuit for recording information and an antenna for transmitting information recorded in the integrated circuit or receiving information recorded in the integrated circuit,
Transmission signal generating means for generating the transmission signal;
Received signal processing means for obtaining information of the wireless tag from the received signal;
Have
　１つのアンテナであってもサーキュレータを用いる必要がなく、アイソレーションがとれるので、送受信装置を小型化できる。 Even with a single antenna, it is not necessary to use a circulator and isolation can be obtained, so that the transmission / reception apparatus can be downsized.
　放射素子の形状は線対称形にすることにより、送信と受信とで偏波方向を容易に直交またはほぼ直交させることができる。 By making the shape of the radiating element line-symmetric, the polarization direction can be easily or almost orthogonal between transmission and reception.
　給電回路に接続された整合回路でアンテナ装置の利得の得られる周波数帯域を定めることにより、または、給電回路によりアンテナ装置の利得の得られる周波数帯域を定めることにより、放射板の大きさ・形状などによって、送受信信号が変化しないので、送受信装置をさらに小型化することができる。 By determining the frequency band where the gain of the antenna device can be obtained with a matching circuit connected to the feeder circuit, or by determining the frequency band where the gain of the antenna device can be obtained with the feeder circuit, the size and shape of the radiation plate, etc. Therefore, since the transmission / reception signal does not change, the transmission / reception apparatus can be further downsized.
　前記給電点は、送信用の平衡給電点及び受信用の平衡給電点であり、前記送信用の平衡給電点と前記受信用の平衡給電点は、互いに直交関係またはほぼ直交関係で配置すれば、送信と受信とで偏波方向を容易に直交またはほぼ直交させることができる。 The feeding point is a balanced feeding point for transmission and a balanced feeding point for reception, and the balanced feeding point for transmission and the balanced feeding point for reception are arranged in an orthogonal relationship or a substantially orthogonal relationship with each other. The polarization direction can be made orthogonal or almost orthogonal between transmission and reception.
特許文献１の無線タグ通信システムの全体概略図である。1 is an overall schematic diagram of a wireless tag communication system of Patent Document 1. FIG. 第１の実施形態に係る無線タグ読み取り装置１０１のブロック図である。1 is a block diagram of a wireless tag reader 101 according to a first embodiment. 放射素子１１の形状と給電点の位置を示す図である。It is a figure which shows the shape of the radiation element 11, and the position of a feeding point. 第２の実施形態に係る放射素子１１の三つの平面形状を示す図である。It is a figure which shows the three planar shapes of the radiation element 11 which concern on 2nd Embodiment. 図５（Ａ）、図５（Ｂ）は第３の実施形態に係る二つの無線タグ読み取り装置１０２，１０３のブロック図である。FIGS. 5A and 5B are block diagrams of two wireless tag readers 102 and 103 according to the third embodiment. 第４の実施形態に係る無線タグシステムの構成図である。It is a block diagram of the wireless tag system which concerns on 4th Embodiment.
《第１の実施形態》
　図２は第１の実施形態に係る無線タグ読み取り装置１０１のブロック図である。
　無線タグ読み取り装置１０１は、ベースバンド回路１４、送受信回路１３、送信給電回路１２Ｔ、受信給電回路１２Ｒ、及び放射素子１１を備えている。 << First Embodiment >>
FIG. 2 is a block diagram of the wireless tag reader 101 according to the first embodiment.
The wireless tag reader 101 includes a baseband circuit 14, a transmission / reception circuit 13, a transmission power supply circuit 12T, a reception power supply circuit 12R, and a radiation element 11.
　送受信回路１３は送信回路１３Ｔ及び受信回路１３Ｒを備えている。送信回路１３Ｔは、ベースバンド回路１４から出力される送信信号を電力増幅し、送信給電回路１２Ｔに対して送信信号を供給する。受信回路１３Ｒは、受信給電回路１２Ｒを介して受信信号をベースバンド回路１４へ出力する。 The transmission / reception circuit 13 includes a transmission circuit 13T and a reception circuit 13R. The transmission circuit 13T amplifies the transmission signal output from the baseband circuit 14 and supplies the transmission signal to the transmission power supply circuit 12T. The reception circuit 13R outputs a reception signal to the baseband circuit 14 via the reception power feeding circuit 12R.
　この例では、送信給電回路１２Ｔは、送信回路１３Ｔと放射素子１１との整合回路を兼ねている。同様に、受信給電回路１２Ｒは、受信回路１３Ｒと放射素子１１との整合回路を兼ねている。送信給電回路１２ＴはインダクタＬ１１，Ｌ１２とキャパシタＣ１１，Ｃ１２とで構成され、インダクタＬ１１，Ｌ１２は放射素子１１との電磁界結合のために配置されている。同様に、受信給電回路１２ＲはインダクタＬ２１，Ｌ２２とキャパシタＣ２１，Ｃ２２とで構成され、インダクタＬ２１，Ｌ２２は放射素子１１との電磁界結合のために配置されている。この例では、二つのキャパシタ（Ｃ１１，Ｃ１２）（Ｃ２１，Ｃ２２）と二つのインダクタ（Ｌ１１，Ｌ１２）（Ｌ２１，Ｌ２２）を備えてそれぞれ平衡給電回路が構成されている。 In this example, the transmission power supply circuit 12T also serves as a matching circuit for the transmission circuit 13T and the radiation element 11. Similarly, the reception power supply circuit 12R also serves as a matching circuit for the reception circuit 13R and the radiation element 11. The transmission power supply circuit 12T includes inductors L11 and L12 and capacitors C11 and C12. The inductors L11 and L12 are arranged for electromagnetic coupling with the radiating element 11. Similarly, the reception power supply circuit 12R is configured by inductors L21 and L22 and capacitors C21 and C22, and the inductors L21 and L22 are arranged for electromagnetic coupling with the radiating element 11. In this example, two capacitors (C11, C12) (C21, C22) and two inductors (L11, L12) (L21, L22) are provided to form balanced power supply circuits.
　図３は、前記放射素子１１の形状と給電点の位置を示す図である。
　この例では、矩形状の放射素子１１の中央部に開口Ａを有し、その開口Ａを縦方向に挟む位置を送信給電点ＦＰｔ，ＦＰｔに定めている。また、開口Ａを横方向に挟む位置を受信給電点ＦＰｒ，ＦＰｒに定めている。前記送信給電点ＦＰｔ，ＦＰｔに前記インダクタＬ１１，Ｌ１２が電磁界結合し、前記受信給電点ＦＰｒ，ＦＰｒに前記インダクタＬ２１，Ｌ２２が電磁界結合する。 FIG. 3 is a diagram showing the shape of the radiating element 11 and the position of the feeding point.
In this example, an opening A is provided at the center of the rectangular radiating element 11, and positions where the opening A is sandwiched in the vertical direction are determined as transmission feed points FPt and FPt. Further, the positions where the opening A is sandwiched in the horizontal direction are defined as the receiving power supply points FPr and FPr. The inductors L11 and L12 are electromagnetically coupled to the transmission feed points FPt and FPt, and the inductors L21 and L22 are electromagnetically coupled to the reception feed points FPr and FPr.
　そのため、破線の矢印で示すように、送信波は送信給電点ＦＰｔ，ＦＰｔからラジアル方向で且つ互いに離れる方向に励振される。同様に、受信波は受信給電点ＦＰｒ，ＦＰｒからラジアル方向で且つ互いに離れる方向に励振される。このようにして平衡給電のパッチアンテナとして作用する。したがって、送信信号は縦方向（第１の偏波方向）で送信され、受信信号は横方向（第１の偏波方向とは直交する第２の偏波方向）で受信される。すなわち送信信号と受信信号は直交関係にあるので、互いにアイソレーションが確保される。 Therefore, the transmission wave is excited in the radial direction from the transmission feed points FPt and FPt and away from each other, as indicated by the dashed arrows. Similarly, the received wave is excited in the radial direction and away from the reception feed points FPr and FPr. In this way, it acts as a balanced feeding patch antenna. Therefore, the transmission signal is transmitted in the vertical direction (first polarization direction), and the reception signal is received in the horizontal direction (second polarization direction orthogonal to the first polarization direction). That is, since the transmission signal and the reception signal are in an orthogonal relationship, isolation is ensured from each other.
　図３の例では、送信波の励振方向と受信波の励振方向とで放射素子の寸法（すなわち二辺の長さ）が異なっている。これは、送信周波数が受信周波数より高いことに合わせて、送信波の励振方向の寸法を受信波の励振方向の寸法より短くしているためである。このような寸法比をもたせることによって、送信アンテナとしての利得と受信アンテナとしての利得を揃えることができる。 In the example of FIG. 3, the dimensions (that is, the lengths of the two sides) of the radiating element are different between the excitation direction of the transmission wave and the excitation direction of the reception wave. This is because the dimension of the excitation direction of the transmission wave is made shorter than the dimension of the excitation direction of the reception wave in accordance with the fact that the transmission frequency is higher than the reception frequency. By providing such a dimensional ratio, the gain as a transmission antenna and the gain as a reception antenna can be made uniform.
　なお、平衡給電を行う二つの給電点の中間位置に開口Ａを設けているが、この開口Ａが無くても、すなわち導体面が連続して在っても、放射素子の励振に対して影響を与えない。そのため、開口Ａは無くてもよい。 Note that an opening A is provided at an intermediate position between two feeding points that perform balanced feeding, but even if this opening A is not present, that is, even if the conductor surface is continuous, it has an effect on the excitation of the radiating element. Not give. Therefore, the opening A may not be provided.
　このように、１つのアンテナであってもサーキュレータを用いることなくアイソレーションが確保できるので、送受信装置を小型化できる。 As described above, even with a single antenna, isolation can be ensured without using a circulator, so that the transmitter / receiver can be downsized.
　また、このように放射素子の形状を線対称形にすることにより、送信と受信とで偏波方向を容易に直交させることができる。
　さらに、送信用の平衡給電点及び受信用の平衡給電点を互いに直交関係で配置すれば、送信と受信とで偏波方向を容易に直交させることができる。 Further, by making the shape of the radiating element line-symmetric in this way, the polarization direction can be easily orthogonalized between transmission and reception.
Furthermore, if the balanced feeding point for transmission and the balanced feeding point for reception are arranged in an orthogonal relationship with each other, the polarization directions can be easily orthogonalized between transmission and reception.
　図２に示した、整合回路を兼ねる送信給電回路１２Ｔの二つのインダクタは巻回方向を逆方向にして結合させている。このため、二つのインダクタで発生する磁界が相殺され、所望のインダクタンス値を得るための電極長が長くなり、その結果、Ｑ値が低くなる。すなわち共振特性の急峻性が緩くなるので共振周波数付近で広帯域化できる。受信給電回路１２Ｒについても同様に、二つのインダクタは巻回方向を逆方向にして結合させている。そのため、受信信号についても共振周波数付近で広帯域化できる。 The two inductors of the transmission power supply circuit 12T also functioning as a matching circuit shown in FIG. 2 are coupled with the winding direction reversed. For this reason, the magnetic fields generated by the two inductors are canceled out, the electrode length for obtaining a desired inductance value is lengthened, and as a result, the Q value is lowered. That is, since the sharpness of the resonance characteristic becomes loose, it is possible to widen the band near the resonance frequency. Similarly, in the reception power feeding circuit 12R, the two inductors are coupled with the winding direction reversed. For this reason, the received signal can be widened in the vicinity of the resonance frequency.
　このようにして、放射素子１１自体の共振周波数が使用周波数より高くても、すなわち放射素子の電気長が使用周波数に見合うほど長くなくても、送信回路１３Ｔ及び受信回路１３Ｒと放射素子１１とはそれぞれ整合する。そのため、所定の利得を得るに充分な大きさであればよく、全体に小型化できる。 In this way, even if the resonance frequency of the radiating element 11 itself is higher than the use frequency, that is, even if the electrical length of the radiating element is not long enough to match the use frequency, the transmitting circuit 13T, the receiving circuit 13R, and the radiating element 11 are Match each one. Therefore, it is sufficient if the size is sufficient to obtain a predetermined gain, and the overall size can be reduced.
《第２の実施形態》
　図４は第２の実施形態に係る放射素子１１の三つの平面形状を示す図である。
　第１の実施形態では矩形状の放射素子を用いる例を示したが、第１の偏波方向で送信信号を送信し、第１の偏波方向とは直交する第２の偏波方向で受信信号を受信できれば、放射素子は種々の形状を採ることができる。 << Second Embodiment >>
FIG. 4 is a diagram showing three planar shapes of the radiating element 11 according to the second embodiment.
In the first embodiment, an example in which a rectangular radiation element is used has been described. However, a transmission signal is transmitted in the first polarization direction, and reception is performed in the second polarization direction orthogonal to the first polarization direction. If the signal can be received, the radiating element can take various shapes.
　図４（Ａ）の例では、放射素子１１を楕円形とし、送信波と受信波の励振方向が楕円の短軸方向と長軸方向になるように、送信給電点ＦＰｔ，ＦＰｔ及び受信給電点ＦＰｒ，ＦＰｒを定めている。図４（Ｂ）の例では、放射素子１１を菱形とし、送信波と受信波の励振方向が菱形の第１の対角辺と第２の対角辺になるように、送信給電点ＦＰｔ，ＦＰｔ及び受信給電点ＦＰｒ，ＦＰｒを定めている。図４（Ｃ）の例では、放射素子１１を十字形とし、送信波と受信波の励振方向が十字の第１の軸方向と第２の軸方向になるように、送信給電点ＦＰｔ，ＦＰｔ及び受信給電点ＦＰｒ，ＦＰｒを定めている。 In the example of FIG. 4A, the transmission elements FPt and FPt and the reception feed point are set so that the radiating element 11 has an elliptical shape and the excitation directions of the transmission wave and the reception wave are the short axis direction and the long axis direction of the ellipse. FPr and FPr are defined. In the example of FIG. 4B, the radiating element 11 has a rhombus shape, and the transmission feed points FPt, FPt, FPt and reception feeding points FPr and FPr are defined. In the example of FIG. 4C, the radiating element 11 has a cross shape, and the transmission feed points FPt and FPt are such that the excitation directions of the transmission wave and the reception wave are the first axis direction and the second axis direction of the cross. And reception feed points FPr and FPr.
　図４（Ａ）、図４（Ｂ）の放射素子は、平衡給電のパッチアンテナとして作用する。図４（Ｃ）の放射素子は、略ダイポールアンテナとして作用する。 4 (A) and 4 (B) act as a balanced feeding patch antenna. The radiating element in FIG. 4C substantially functions as a dipole antenna.
　なお、第１の実施形態で述べたとおり、図４（Ａ）、図４（Ｂ）、図４（Ｃ）において、それぞれの開口Ａは無くてもよい。 In addition, as described in the first embodiment, each opening A may not be provided in FIGS. 4A, 4B, and 4C.
《第３の実施形態》
　図５（Ａ）、図５（Ｂ）は第３の実施形態に係る二つの無線タグ読み取り装置１０２，１０３のブロック図である。第３の実施形態では、不平衡給電を行う例である。 << Third Embodiment >>
FIGS. 5A and 5B are block diagrams of two wireless tag readers 102 and 103 according to the third embodiment. The third embodiment is an example in which unbalanced power feeding is performed.
　図５（Ａ）の無線タグ読み取り装置１０２は、ベースバンド回路１４、送受信回路１６、送信給電回路１５Ｔ、受信給電回路１５Ｒ、及び放射素子１１を備えている。 5A includes a baseband circuit 14, a transmission / reception circuit 16, a transmission power supply circuit 15T, a reception power supply circuit 15R, and a radiating element 11. The wireless tag reader 102 shown in FIG.
　送受信回路１６は送信回路１６Ｔ及び受信回路１６Ｒを備えている。送信回路１６Ｔは、ベースバンド回路１４から出力される送信信号を不平衡で電力増幅し、送信給電回路１５Ｔに対して不平衡の送信信号を供給する。受信回路１６Ｒは、受信給電回路１５Ｒを介して受信信号を不平衡で入力し、ベースバンド回路１４へ出力する。 The transmission / reception circuit 16 includes a transmission circuit 16T and a reception circuit 16R. The transmission circuit 16T amplifies the transmission signal output from the baseband circuit 14 in an unbalanced manner, and supplies the unbalanced transmission signal to the transmission power supply circuit 15T. The reception circuit 16R inputs the reception signal unbalanced via the reception power supply circuit 15R and outputs it to the baseband circuit 14.
　送信給電回路１５ＴはキャパシタＣ１１と二つのインダクタＬ１１，Ｌ１２から構成されていて、インダクタＬ１１，Ｌ１２と放射素子１１との電磁界結合により、放射素子１１に対して不平衡給電する。 The transmission power supply circuit 15T includes a capacitor C11 and two inductors L11 and L12. The transmission power supply circuit 15T supplies unbalanced power to the radiating element 11 by electromagnetic coupling between the inductors L11 and L12 and the radiating element 11.
　受信給電回路１５ＲはキャパシタＣ２１と二つのインダクタＬ２１，Ｌ２２から構成されていて、インダクタＬ２１，Ｌ２２と放射素子１１との電磁界結合により、放射素子１１に対して不平衡給電する。 The receiving power supply circuit 15R is composed of a capacitor C21 and two inductors L21 and L22, and supplies unbalanced power to the radiating element 11 by electromagnetic coupling between the inductors L21 and L22 and the radiating element 11.
　放射素子１１に対する給電点の位置関係は、第１・第２の実施形態で示したものと同様である。 The positional relationship of the feeding point with respect to the radiating element 11 is the same as that shown in the first and second embodiments.
　図５（Ｂ）の無線タグ読み取り装置１０３と図５（Ａ）の無線タグ読み取り装置１０２とは、放射素子１１に対する結合の仕方が異なる。
　無線タグ読み取り装置１０３において、送信給電回路１７ＴはキャパシタＣ１１とインダクタＬ１１から構成されていて、インダクタＬ１１と放射素子１１との電磁界結合により、放射素子１１に対して不平衡給電する。 The RFID tag reading device 103 in FIG. 5B and the RFID tag reading device 102 in FIG.
In the wireless tag reader 103, the transmission power supply circuit 17T includes a capacitor C11 and an inductor L11, and supplies unbalanced power to the radiation element 11 by electromagnetic coupling between the inductor L11 and the radiation element 11.
　受信給電回路１７ＲはキャパシタＣ２１とインダクタＬ２１から構成されていて、インダクタＬ２１と放射素子１１との電磁界結合により、放射素子１１に対して不平衡給電する。インダクタＬ１１による放射素子１１上の給電点は、図３に示した例で二つの給電点ＦＰｔ，ＦＰｔのうち一方である。同様に、インダクタＬ２１による放射素子１１上の給電点は、図３に示した例で二つの給電点ＦＰｒ，ＦＰｒのうち一方である。そして、放射素子１１の中央には開口Ａを設けることなく、放射素子１１の中央を接地する。 The reception power supply circuit 17R is composed of a capacitor C21 and an inductor L21, and performs unbalanced power supply to the radiating element 11 by electromagnetic coupling between the inductor L21 and the radiating element 11. The feeding point on the radiating element 11 by the inductor L11 is one of the two feeding points FPt and FPt in the example shown in FIG. Similarly, the feeding point on the radiation element 11 by the inductor L21 is one of the two feeding points FPr and FPr in the example shown in FIG. The center of the radiating element 11 is grounded without providing the opening A at the center of the radiating element 11.
《第４の実施形態》
　図６は第４の実施形態に係る無線タグシステムの構成図である。この無線タグシステムは無線タグ読み取り装置１０１と無線タグ２０１とで構成されている。無線タグ読み取り装置１０１は第１の実施形態で示したものである。無線タグ２０１は、ベースバンド回路２４、送受信回路２３、送受信給電回路２２及び放射素子２１を備えている。 << Fourth Embodiment >>
FIG. 6 is a configuration diagram of a wireless tag system according to the fourth embodiment. This wireless tag system includes a wireless tag reader 101 and a wireless tag 201. The wireless tag reader 101 is the same as that shown in the first embodiment. The wireless tag 201 includes a baseband circuit 24, a transmission / reception circuit 23, a transmission / reception power supply circuit 22, and a radiation element 21.
　無線タグ読み取り装置１０１は、プリアンブルの電波、コマンドビット列で変調した電波、無変調の電波を、この順に送信する。無線タグ２０１は、前記プリアンブル部分で初期動作に必要なだけのエネルギーを蓄積し、続くコマンドビット列を復調し解釈し、無変調のキャリア部分で反射波に返答を乗せて情報を返す（送信する）。無線タグ読み取り装置１０１は、無線タグ２０１からの返答を読み取り、復調し解釈し、必要な処理を行う。 The wireless tag reader 101 transmits a preamble radio wave, a radio wave modulated with a command bit string, and an unmodulated radio wave in this order. The wireless tag 201 accumulates energy necessary for initial operation in the preamble part, demodulates and interprets the subsequent command bit string, and returns (transmits) information by putting a response on the reflected wave in the unmodulated carrier part. . The wireless tag reader 101 reads the response from the wireless tag 201, demodulates and interprets it, and performs necessary processing.
　なお、以上に示した各実施形態では、送信給電回路は、放射素子と送信回路との間の整合及び放射素子に対する給電を兼ねるようにしたが、給電回路と整合回路とを別に設けてもよい。すなわち、放射素子に対して電磁界結合する送信信号用の給電回路を設け、その給電回路と送信回路との間に整合回路を設けてもよい。同様に、放射素子に電磁界結合する受信信号用の給電回路を設け、その給電回路と受信回路との間に整合回路を設けてもよい。 In each of the embodiments described above, the transmission power feeding circuit is configured to perform both the matching between the radiating element and the transmission circuit and the power feeding to the radiating element. However, the power feeding circuit and the matching circuit may be provided separately. . That is, a feeding circuit for a transmission signal that is electromagnetically coupled to the radiating element may be provided, and a matching circuit may be provided between the feeding circuit and the transmission circuit. Similarly, a power supply circuit for a reception signal that is electromagnetically coupled to the radiating element may be provided, and a matching circuit may be provided between the power supply circuit and the reception circuit.
　また、前記整合回路は種々の構成を採ることができる。例えば、インダクタとキャパシタを備えて整合回路を構成してもよく、１つ又は複数のインダクタで整合回路を構成してもよい。 Further, the matching circuit can take various configurations. For example, the matching circuit may be configured by including an inductor and a capacitor, or the matching circuit may be configured by one or a plurality of inductors.
　また、以上に示した各実施形態では送信信号の偏波方向と受信信号の偏波方向とが直交関係である例を示したが、受信系と送信系とのアイソレーションが確保できる程度であれば、必ずしも直交（９０°）でなくてもよい。すなわち、送信信号の偏波方向と受信信号の偏波方向とはほぼ直交関係であってもよい。 In each of the above-described embodiments, the example in which the polarization direction of the transmission signal and the polarization direction of the reception signal are orthogonal to each other has been shown. However, as long as the isolation between the reception system and the transmission system can be ensured. For example, it is not necessarily orthogonal (90 °). That is, the polarization direction of the transmission signal and the polarization direction of the reception signal may be substantially orthogonal.
Ａ…開口
ＦＰｒ，ＦＰｒ…受信給電点
ＦＰｔ，ＦＰｔ…送信給電点
１１…放射素子
１２Ｒ…受信給電回路
１２Ｔ…送信給電回路
１３…送受信回路
１３Ｒ…受信回路
１３Ｔ…送信回路
１４…ベースバンド回路
１５Ｒ…受信給電回路
１５Ｔ…送信給電回路
１６…送受信回路
１６Ｒ…受信回路
１６Ｔ…送信回路
１７Ｒ…受信給電回路
１７Ｔ…送信給電回路
２１…放射素子
２２…送受信給電回路
２３…送受信回路
２４…ベースバンド回路
１０１，１０２，１０３…無線タグ読み取り装置
２０１…無線タグ A ... opening FPr, FPr ... reception feed point FPt, FPt ... transmission feed point 11 ... radiation element 12R ... reception feed circuit 12T ... transmission feed circuit 13 ... transmission / reception circuit 13R ... reception circuit 13T ... transmission circuit 14 ... baseband circuit 15R ... Reception power supply circuit 15T ... Transmission power supply circuit 16 ... Transmission / reception circuit 16R ... Reception circuit 16T ... Transmission circuit 17R ... Reception power supply circuit 17T ... Transmission power supply circuit 21 ... Radiation element 22 ... Transmission / reception power supply circuit 23 ... Transmission / reception circuit 24 ... Baseband circuit 101, 102, 103 ... RFID tag reading device 201 ... RFID tag

Claims (7)

  1. 　給電点を有する送受兼用の放射素子と、放射素子の給電点に結合する給電回路と、を有し、
    　前記放射素子は、通信相手に対して第１の偏波方向で送信信号を送信し、第１の偏波方向とは直交またはほぼ直交する第２の偏波方向で前記通信相手から受信信号を受信する、送受信装置。     A transmitting / receiving radiating element having a feeding point; and a feeding circuit coupled to the feeding point of the radiating element;
    The radiating element transmits a transmission signal in a first polarization direction to a communication partner, and receives a reception signal from the communication partner in a second polarization direction orthogonal or substantially orthogonal to the first polarization direction. A receiving / transmitting device.
  2. 　前記放射素子の形状は線対称形である、請求項１に記載の送受信装置。 The transmission / reception apparatus according to claim 1, wherein the shape of the radiating element is line symmetrical.
  3. 　前記放射素子の給電点と前記給電回路とは電磁界結合によって結合されている、請求項１又は２に記載の送受信装置。 The transmission / reception apparatus according to claim 1 or 2, wherein a feeding point of the radiating element and the feeding circuit are coupled by electromagnetic coupling.
  4. 　前記給電回路に接続された整合回路を備え、前記放射素子、前記給電回路及び前記整合回路によりアンテナ装置が構成され、前記アンテナ装置の利得の得られる周波数帯域が前記整合回路により定められている、請求項１乃至３の何れかに記載の送受信装置。 A matching circuit connected to the feeder circuit, an antenna device is configured by the radiating element, the feeder circuit and the matching circuit, and a frequency band in which gain of the antenna device is obtained is determined by the matching circuit; The transmission / reception apparatus according to claim 1.
  5. 　前記放射素子及び前記給電回路によりアンテナ装置が構成され、前記アンテナ装置の利得の得られる周波数帯域が前記給電回路により定められている、請求項１乃至３の何れかに記載の送受信装置。 The transmission / reception device according to any one of claims 1 to 3, wherein an antenna device is configured by the radiating element and the feeding circuit, and a frequency band in which a gain of the antenna device is obtained is determined by the feeding circuit.
  6. 　前記給電点は、送信用の平衡給電点及び受信用の平衡給電点であり、
    　前記送信用の平衡給電点と前記受信用の平衡給電点は、互いに直交関係またはほぼ直交関係で配置された、請求項１乃至５の何れかに記載の送受信装置。     The feeding points are a balanced feeding point for transmission and a balanced feeding point for reception,
    6. The transmission / reception apparatus according to claim 1, wherein the transmission balanced feeding point and the receiving balanced feeding point are arranged in an orthogonal relationship or a substantially orthogonal relationship.
  7. 　請求項１乃至６の何れかに記載の送受信装置を備え、
    　前記送受信装置の通信相手は、情報を記録する集積回路及び前記集積回路に記録された情報を送信又は前記集積回路へ記録する情報を受信するアンテナを備えた無線タグであり、
    　前記送信信号を生成する送信信号生成手段と、
    　前記受信信号から、前記無線タグの情報を取得する受信信号処理手段と、
    を有する無線タグ読み取り装置。     A transmission / reception device according to any one of claims 1 to 6,
    The communication partner of the transmission / reception device is a wireless tag including an integrated circuit for recording information and an antenna for transmitting information recorded in the integrated circuit or receiving information recorded in the integrated circuit,
    Transmission signal generating means for generating the transmission signal;
    Received signal processing means for obtaining information of the wireless tag from the received signal;
    A wireless tag reading device having:
PCT/JP2010/066288 2009-10-21 2010-09-21 Transmitting/receiving device and wireless tag reader WO2011048905A1 (en)

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JP2009242364 2009-10-21
JP2009-242364 2009-10-21

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Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH07162227A (en) * 1993-12-07 1995-06-23 Matsushita Electric Ind Co Ltd Polarized wave common-use antenna system
JPH0884021A (en) * 1994-09-14 1996-03-26 Toshiba Corp Antenna shared between polarized waves
JP2006238282A (en) * 2005-02-28 2006-09-07 Matsushita Electric Ind Co Ltd Antenna unit, transmitter/receiver, wireless tag reading apparatus, and wireless tag read system
JP2008011565A (en) * 1997-03-24 2008-01-17 Telefon Ab L M Ericsson Integrated transmit/receive antenna with arbitrary utilization of antenna aperture
JP2009027233A (en) * 2007-07-17 2009-02-05 Murata Mfg Co Ltd Wireless ic device, and electronic equipment

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH07162227A (en) * 1993-12-07 1995-06-23 Matsushita Electric Ind Co Ltd Polarized wave common-use antenna system
JPH0884021A (en) * 1994-09-14 1996-03-26 Toshiba Corp Antenna shared between polarized waves
JP2008011565A (en) * 1997-03-24 2008-01-17 Telefon Ab L M Ericsson Integrated transmit/receive antenna with arbitrary utilization of antenna aperture
JP2006238282A (en) * 2005-02-28 2006-09-07 Matsushita Electric Ind Co Ltd Antenna unit, transmitter/receiver, wireless tag reading apparatus, and wireless tag read system
JP2009027233A (en) * 2007-07-17 2009-02-05 Murata Mfg Co Ltd Wireless ic device, and electronic equipment

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