+

WO2006035598A1 - Dispositif de communication d’étiquette radio - Google Patents

Dispositif de communication d’étiquette radio Download PDF

Info

Publication number
WO2006035598A1
WO2006035598A1 PCT/JP2005/016898 JP2005016898W WO2006035598A1 WO 2006035598 A1 WO2006035598 A1 WO 2006035598A1 JP 2005016898 W JP2005016898 W JP 2005016898W WO 2006035598 A1 WO2006035598 A1 WO 2006035598A1
Authority
WO
WIPO (PCT)
Prior art keywords
antenna
transmission
polarization
reception
wireless tag
Prior art date
Application number
PCT/JP2005/016898
Other languages
English (en)
Japanese (ja)
Inventor
Katsuyuki Kuramoto
Original Assignee
Brother Kogyo Kabushiki Kaisha
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Brother Kogyo Kabushiki Kaisha filed Critical Brother Kogyo Kabushiki Kaisha
Publication of WO2006035598A1 publication Critical patent/WO2006035598A1/fr

Links

Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q1/00—Details of, or arrangements associated with, antennas
    • H01Q1/12—Supports; Mounting means
    • H01Q1/22—Supports; Mounting means by structural association with other equipment or articles
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q21/00—Antenna arrays or systems
    • H01Q21/24—Combinations of antenna units polarised in different directions for transmitting or receiving circularly and elliptically polarised waves or waves linearly polarised in any direction
    • H01Q21/245—Combinations of antenna units polarised in different directions for transmitting or receiving circularly and elliptically polarised waves or waves linearly polarised in any direction provided with means for varying the polarisation 
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q21/00—Antenna arrays or systems
    • H01Q21/24—Combinations of antenna units polarised in different directions for transmitting or receiving circularly and elliptically polarised waves or waves linearly polarised in any direction
    • H01Q21/26—Turnstile or like antennas comprising arrangements of three or more elongated elements disposed radially and symmetrically in a horizontal plane about a common centre
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q3/00—Arrangements for changing or varying the orientation or the shape of the directional pattern of the waves radiated from an antenna or antenna system
    • H01Q3/26—Arrangements for changing or varying the orientation or the shape of the directional pattern of the waves radiated from an antenna or antenna system varying the relative phase or relative amplitude of energisation between two or more active radiating elements; varying the distribution of energy across a radiating aperture
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/10—Polarisation diversity; Directional diversity

Definitions

  • the present invention relates to an improvement in a wireless tag communication device that performs communication with a wireless tag capable of wirelessly writing and reading information.
  • An RFID (Radio Frequency Identification) system is known in which information is read out in a non-contact manner from a small-sized wireless tag (responder) in which predetermined information is stored by a predetermined wireless tag communication device (interrogator). ing.
  • This RFID system can read information stored in a wireless tag by communication with the wireless tag communication device even when the wireless tag is dirty or placed at an invisible position. Therefore, practical use is expected in various fields such as product management and inspection processes.
  • the wireless tag communication device transmits a predetermined transmission signal to the wireless tag.
  • the wireless tag is transmitted by transmitting the (carrier wave) through the transmitting antenna and receiving the return signal (reflected wave) returned from the wireless tag that has received the transmitted signal through the receiving antenna (there is also a mode common to the transmitting antenna).
  • the communication sensitivity was significantly reduced. That is, when the plane of polarization of the receiving antenna provided in the RFID tag communication apparatus (the plane on which the electric field component vibrates) is perpendicular to the plane of polarization of the reflected wave from the RFID tag, the reflected wave is almost Power that cannot be received.
  • an array antenna device described in Patent Document 1 has been proposed.
  • received signals received by a plurality of vertically polarized antennas and horizontally polarized antennas are converted into digital signals, the phase is adjusted by multiplying the weight setting values, and the multiplied values are added to the plurality of polarization signals.
  • Patent Document 1 Japanese Patent Laid-Open No. 9 153721
  • the conventional technique is premised on being incorporated in a radar device or the like, and in RF ID communication for which a wireless tag whose communication sensitivity varies significantly due to a relative positional relationship is a communication target, Since the polarization plane of the array antenna does not necessarily have a suitable angle with respect to the polarization plane of the reflected wave of the tag force, it was not possible to eliminate the fear that the communication sensitivity would decrease. For this reason, there has been a demand for the development of a wireless tag communication device that realizes highly sensitive communication regardless of the relative positional relationship with the wireless tag! /.
  • the present invention has been made in the background of the above circumstances, and an object of the present invention is to provide a wireless tag communication device that realizes highly sensitive communication regardless of the relative positional relationship with the wireless tag. There is to serve.
  • the gist of the present invention is that a transmission signal is transmitted to a predetermined wireless tag, and a reply is returned from the wireless tag according to the transmission signal.
  • a wireless tag communication device that receives a signal and communicates information with the wireless tag, comprising a plurality of antenna elements arranged in a predetermined relative positional relationship, and a polarization plane of the transmission signal And a transmission antenna capable of controlling directivity, and a transmission control unit for controlling the polarization plane and directivity of the transmission signal transmitted based on the transmission antenna power.
  • the transmission antenna includes a plurality of antenna elements arranged in a predetermined relative positional relationship, and can control the polarization plane and directivity of the transmission signal, and transmit from the transmission antenna.
  • a transmission control unit that controls the polarization plane and directivity of the transmitted signal, so that the wireless tag to be communicated can be placed in any relative position.
  • the polarization plane and directivity of the transmission signal can be matched. That is, it is possible to provide a wireless tag communication device that realizes highly sensitive communication regardless of the relative positional relationship with the wireless tag.
  • the antenna comprises a plurality of antenna elements arranged in a predetermined relative positional relationship, and is received by controlling the polarization plane and directivity so as to be suitable for a return signal from the wireless tag.
  • a reception control unit that controls the polarization plane and directivity of the reception antenna by adaptive array processing. In this way, it is possible to receive with the optimum polarization plane and directivity for the return signal of the RFID tag that is the object of communication.
  • the transmission control unit controls the transmission signal transmitted from the transmission antenna to be any one of vertical polarization, horizontal polarization, and circular polarization. In this way, it is possible to reduce the sensitivity fluctuation due to the polarization plane of the transmission signal with respect to the wireless tag regardless of the relative position of the wireless tag to be communicated.
  • a reception quality determination unit that determines whether or not a reception signal received by the reception antenna has a predetermined quality
  • the transmission control unit firstly transmits the transmission signal.
  • the directivity of the transmission signal transmitted by the antenna is set to a wide angle and the determination of the reception quality determination unit is negative
  • the polarization plane and directivity of the transmission signal are determined based on the result of adaptive processing of the reception signal. It switches so that it may control. In this way, the transmission signal can be transmitted with a polarization plane and directivity suitable for the wireless tag that is the communication target.
  • the transmission control unit firstly transmits the transmission signal. If the transmission signal transmitted by the antenna is the first polarization, and the determination of the reception quality determination unit is negative, the transmission signal transmitted by the transmission antenna is the second polarization. To switch to. In this way, better communication can be realized with the wireless tag that is the communication target.
  • the first polarization is one of horizontal polarization and vertical polarization
  • the second polarization is the first of horizontal polarization and vertical polarization. It is different from the polarization of 1.
  • the transmission control unit can switch the transmission signal transmitted from the transmission antenna from horizontal polarization to vertical polarization, or from vertical polarization to horizontal polarization. Can achieve highly sensitive communication with the wireless tag that is the target of communication.
  • the transmission control unit firstly transmits the transmission signal.
  • the transmission signal transmitted by the antenna is circularly polarized and the determination of the reception quality determination unit is negative, the polarization plane and directivity of the transmission signal are controlled based on the result of adaptive processing of the reception signal. It switches so as to. In this way, the processing time required for the communication can be shortened.
  • the antenna element is a linearly polarized wave antenna, and includes a plurality of antenna element sets each including a pair of linearly polarized antenna antennas arranged so as to be orthogonal to each other. .
  • a practical antenna capable of controlling the polarization plane and directivity can be configured.
  • the plurality of antenna element sets are arranged in a single plane so that one linearly polarized antenna included in each of the antenna element sets is aligned along a straight line. It is a thing. In this way, a practical antenna that can control the polarization plane and directivity can be configured.
  • the plurality of antenna element sets include a linear polarization antenna included in each of the antenna element sets and a corresponding linear polarization antenna included in another antenna element set. They are arranged in parallel and in the same plane. In this way, a practical antenna capable of controlling the plane of polarization and directivity can be configured.
  • the plurality of antenna element sets have a predetermined number of first antenna element set group forces such that one linearly polarized antenna included in each of the antenna element sets is aligned along a straight line.
  • a predetermined number of second antenna element set groups are arranged such that one linearly polarized antenna included in each of the antenna element sets is aligned along a straight line and They are arranged in the same second plane orthogonal to the first plane. In this way, it is possible to configure a practical antenna capable of suitably controlling directivity within the polarization plane and a wide angle range.
  • the antenna element is a linearly polarized antenna, and a predetermined number of first straight lines are used.
  • a linearly polarized antenna group is arranged along each of a pair of straight lines that intersect each other in the first plane, and a predetermined number of second linearly polarized antenna groups are connected to the first plane. They are arranged so as to be parallel to each other in a second plane perpendicular to each other and to be perpendicular to the first plane.
  • the antenna element is a linearly polarized antenna, and a predetermined number of first linearly polarized antenna groups are arranged along a predetermined first straight line.
  • a predetermined number of second linearly polarized antenna groups are arranged and arranged along each of the second straight line and the third straight line that intersect each other in a plane orthogonal to the first straight line.
  • the directivity can be suitably controlled over a wide angle range in the plane including the polarization plane and the first straight line and the second straight line, and the directivity can be controlled even in the plane including the third straight line.
  • An antenna can be configured.
  • the antenna element is a linear dipole antenna.
  • a practical antenna capable of controlling the polarization plane and directivity can be configured.
  • the plurality of antenna elements are antenna elements shared for transmission and reception shared by the transmission antenna and the reception antenna.
  • the antenna configuration of the wireless tag communication device can be made as small as possible.
  • FIG. 1 is a diagram for explaining a communication system using a wireless tag communication device according to an embodiment of the present invention.
  • FIG. 2 is a diagram for explaining a configuration of a wireless tag communication device according to an embodiment of the present invention.
  • FIG. 3 is a diagram illustrating an antenna element set configured by combining a plurality of antenna elements in the wireless tag communication device of FIG. 2.
  • FIG. 4 is a diagram illustrating a transmission / reception shared antenna provided in the RFID tag communication apparatus of FIG. 2.
  • FIG. 5 is a diagram for explaining the configuration of a high-frequency transmitting / receiving unit provided in the wireless tag communication device of FIG. is there.
  • FIG. 6 is a diagram illustrating a configuration of a transmission weight multiplying unit provided in the wireless tag communication device of FIG. 2.
  • FIG. 7 is a diagram exemplifying transmission complex weight setting values to be multiplied in the transmission weight multiplication unit in FIG. 6.
  • FIG. 8 is a diagram illustrating a configuration of a reception wait adaptive control unit provided in the wireless tag communication device in FIG. 2.
  • FIG. 9 is a diagram illustrating the configuration of a wireless tag that is a communication target of the wireless tag communication device in FIG. 2.
  • FIG. 10 is a flowchart for explaining RFID communication control with the wireless tag in FIG. 9 by the wireless tag communication device in FIG.
  • FIG. 11 is a flowchart explaining transmission weight setting control which is a part of the control of FIG.
  • FIG. 12 is a flowchart for explaining AAA processing control which is a part of the control of FIG.
  • FIG. 13 is a flowchart illustrating transmission weight setting control executed as an alternative to FIG. 11 in the RFID communication control shown in FIG.
  • FIG. 14 is a diagram showing an antenna provided in the RFID tag communication apparatus shown in FIG. 2 as an alternative to the antenna shown in FIG.
  • FIG. 15 is a diagram showing still another antenna provided in the RFID tag communication apparatus shown in FIG. 2 as an alternative to the antenna shown in FIG.
  • FIG. 16 is a view showing a modification of the antenna of FIG.
  • FIG. 17 is a diagram showing still another antenna provided in the RFID tag communication apparatus shown in FIG. 2 as an alternative to the antenna shown in FIG.
  • FIG. 18 is a diagram showing still another antenna provided in the RFID tag communication apparatus shown in FIG. 2 as an alternative to the antenna shown in FIG.
  • FIG. 1 is a diagram illustrating a communication system 10 using a wireless tag communication device 12 according to an embodiment of the present invention.
  • the communication system 10 is a so-called wireless tag communication device 12 of the present embodiment and a so-called single or multiple (single in FIG. 1) wireless tags 14 that are communication targets of the wireless tag communication device 12.
  • An RFID (Radio Frequency IDentification) system wherein the RFID tag communication device 12 functions as an interrogator of the RFID system, and the RFID tag 14 functions as a responder. That is, when the interrogation wave F (transmission signal) is transmitted from the radio tag communication device 12 toward the radio tag 14, the radio tag 14 that has received the interrogation wave F receives the interrogation wave F by a predetermined information signal (data). When the interrogation wave F is modulated and sent back as a response wave F (reply signal) to the RFID tag communication device 12, information communication is performed between the RFID tag communication device 12 and the RFID tag 14. Is called.
  • FIG. 2 is a diagram illustrating the configuration of the wireless tag communication device 12.
  • the wireless tag communication device 12 of the present embodiment performs information communication with the wireless tag 14 in order to read and write information to the wireless tag 14 and the like.
  • a DSP (Digital Signal Processor) 16 that performs digital signal processing such as outputting a transmission signal as a digital signal and demodulating a return signal from the wireless tag 14, and its DSP 16
  • a plurality for receiving reply signals returned from the wireless tag 14 according to the transmission signal are received.
  • the antenna elements 18a to 18f are supplied to the corresponding antenna element 18 by converting the transmission signal output by the DSP 16 into an analog signal, etc.
  • a plurality of (six in FIG. 2) high-frequency transmitting / receiving units 20a to 20f supplied to the second memory unit 26 by converting the received signal received by the antenna element 18 into a digital signal, etc. Is simply referred to as a high frequency transmitter / receiver 20), a frequency converted signal output unit 22 for supplying a predetermined frequency converted signal to the high frequency transmitter / receiver 20, and a transmission signal AM-modulated by the DSP 16.
  • a second memory unit 26 which is a storage device that causes the DSP 16 to output the received signals in response to the DSP 16 command.
  • the DSP 16 is a so-called microcomputer system that includes a CPU, a ROM, a RAM, and the like and performs signal processing according to a program stored in the ROM in advance while using a temporary storage function of the RAM.
  • Transmission bit string generation unit 28 that generates a command bit string corresponding to the transmission signal
  • FSK encoding unit 30 that encodes the digital signal output from the transmission bit string generation unit 28 using the FSK method
  • the AM modulation unit 32 that modulates the signal encoded by 0 by the AM method and supplies the signal to the first memory unit 24, and the signal read from the first memory unit 24 is multiplied by a predetermined transmission weight to A transmission weight multiplier 34 to be supplied to a plurality of high-frequency transceivers 20, a transmission weight controller 36 for controlling a transmission weight to be multiplied in the transmission weight multiplier 34, and the memory unit 2 6.
  • a reception weight multiplication unit 38 that multiplies each reception signal read from 6 by a predetermined reception weight, and controls the reception weight that is multiplied in the reception weight multiplication unit 38 and, if necessary, the transmission weight control unit 36
  • a reception weight adaptive control unit 40 that supplies a reception weight that has converged to the signal, a reference signal generation unit 42 that supplies a predetermined reference signal to the reception weight adaptive control unit 40, and the reception weight multiplication described above.
  • the AM demodulator 44 detects the AM demodulated wave by demodulating the received signal multiplied by the predetermined reception weight by the AM unit 38, and decodes the AM demodulated wave demodulated by the AM demodulator 44 using the FSK method
  • the FSK decoding unit 46, the response bit string interpretation unit 48 that interprets the decoded signal decoded by the FSK decoding unit 46 and reads the information signal related to the modulation of the wireless tag 14, and the AM output from the AM demodulation unit 44
  • a reception signal strength detection unit 50 that detects reception signal strength based on the demodulated wave is functionally provided.
  • the reception signal strength detection unit 50 functions as a reception quality determination unit that determines whether or not a reception signal received by an antenna 54 described later has a predetermined quality. For example, the reception signal strength is greater than or equal to a predetermined value. If it is, it is determined that the received signal has a predetermined quality.
  • FIG. 3 is a diagram illustrating an antenna element set 52 configured by combining the antenna elements 18.
  • the antenna element 18 is, for example, a linearly polarized antenna that efficiently receives radio waves having a predetermined plane of polarization, and is preferably a linear dipole antenna.
  • the antenna elements 18a and 18b which are a pair of antenna elements 18, are arranged as an antenna element set 52a that is combined in a cross shape so as to be orthogonal to each other. Yes.
  • the antenna element 18a arranged in the horizontal direction transmits horizontal polarization
  • the antenna element 18b arranged in the vertical direction transmits vertical polarization.
  • the antenna element 18a efficiently receives horizontal polarization
  • the antenna element 18b efficiently receives vertical polarization.
  • FIG. 4 is a diagram illustrating a transmission / reception shared antenna 54 provided in the RFID tag communication apparatus 12.
  • the antenna element set 52a force from the antenna elements 18a and 18b arranged so as to be orthogonal to each other.
  • the antenna elements 18c and 18d Antenna element set 52b, and antenna element set 52c is composed of antenna elements 18e and 18f. These antenna element sets 52a, 52b, and 52c (hereinafter simply referred to as antenna element set 52 unless otherwise distinguished).
  • One of the linearly polarized antennas included in each of them that is, the antenna elements 18a, 18c, 18e arranged in the horizontal direction are arranged along the straight line and in the same plane, so that the transmission Transmitting antenna capable of controlling polarization plane and directivity of signal And an antenna 54 that functions as a receiving antenna that can receive signals by controlling the plane of polarization and directivity so as to be suitable for the return signal from the wireless tag 14.
  • FIG. 5 is a diagram for explaining the configuration of the high-frequency transmitting / receiving unit 20.
  • the high frequency transmitter / receiver 20 converts the digital signal supplied from the DSP 16 into an analog signal, and the signal converted into the analog signal by the DZA converter 56 into the analog signal.
  • the up-converter 58 that up-converts by multiplying the frequency-converted signal supplied from the frequency-converted signal output unit 22 and the transmission signal BP that passes only the signal in the predetermined frequency band among the signals output from the up-converter 58 F (Band Pass Filter) 60 and a transmission signal output from the transmission signal BPF60 are supplied to the corresponding antenna element 18, and a reception signal received by the antenna element 18 is supplied to the down converter 64.
  • Downconverter 64 that downconverts by multiplying the signals
  • received signal BPF66 that passes only signals in the specified frequency band among the signals output from downconverter 64
  • An AZD conversion unit 68 that converts a signal into a digital signal and supplies the signal to the DSP 16 is provided. Transmission of a transmission signal by the corresponding antenna element 18 and reception of a return signal from the wireless tag 14 corresponding to the transmission signal are performed via such a high-frequency transmission / reception unit 20.
  • FIG. 6 is a diagram for explaining the configuration of the transmission weight multiplying unit 34. As shown in FIG. 6, the transmission weight multiplication unit 34 multiplies the signal read from the memory unit 24 by the transmission weight W to obtain the horizontally polarized antenna output TXD as the high frequency transmission / reception unit 20a.
  • Multiplier 70a to be supplied to the product and the transmission weight W multiplied by the horizontal polarization antenna output TXD
  • Multiplier 70c to be supplied to the high frequency transmitter / receiver 20c and a transmission weight W
  • HI TXH2 is calculated and supplied to the high frequency transmitter / receiver 20e as the horizontally polarized antenna output TXD.
  • Multiplication unit 70e and transmission weight W are multiplied to obtain the vertically polarized antenna output TXD.
  • Multiplication unit 70b supplied to high-frequency transmission / reception unit 20b and transmission weight W are multiplied by vertical offset.
  • the high-frequency transmitter / receiver is multiplied by the transmission weight W as the vertically polarized antenna output TXD.
  • the horizontally polarized antenna outputs TXD, TXD, TXD are respectively transmitted from the antenna elements 18a, 18c, 18e.
  • FIG. 7 is a diagram illustrating transmission complex weight setting values multiplied by the transmission weight multiplication unit 34.
  • the transmission weight control unit 36 transmits the transmission signal transmitted from the antenna 54 to vertical polarization, horizontal polarization, +45 degree polarization, 45 degree direction deviation. Transmit weights W, W, W, W for wave or circular polarization
  • a predetermined transmission weight is read in accordance with the signal mode and supplied to the transmission weight multiplication unit 34.
  • the received AAA weights W 1, W 2, W 3, W 4, W 5, and W converged in the received wait adaptive control unit 40 are stored.
  • the transmission weight can be set based on the converged reception AAA weight.
  • the first polarization and the second polarization may be any combination of the vertical polarization, the horizontal polarization, the +45 degree polarization, the 45 degree polarization, and the circular polarization.
  • the wireless tag 14 can be reliably detected by switching in the order of vertical polarization, polarization in the +45 degree direction, horizontal polarization, and polarization in the 45 degree direction.
  • the transmission weight control unit 36 functions as a transmission control unit that controls the polarization plane and directivity of the transmission signal transmitted from the antenna 54 serving as a transmission antenna.
  • FIG. 8 is a diagram for explaining the configuration of the reception weight multiplying unit 38. As shown in FIG. 8, the reception weight multiplication unit 38 multiplies the horizontal polarization antenna input RXD from the antenna element 18a read from the memory unit 26 by the reception weight W.
  • Multiplying section 72e that multiplies H2 by reception weight W, and vertical offset from antenna element 18b.
  • RXH2 Multiplier 72b which multiplies reception weight W by wave antenna input RXD, and antenna
  • a synthesizing unit 74 that synthesizes the received signal multiplied by the signal and supplies the synthesized signal to the AM demodulating unit 44.
  • the reception weights W 1, W 2, W 3, W 4, W 4, and 5 W multiplied by the reception weight multiplication unit 38 are supplied from the reference signal generation unit 42.
  • the reception wait adaptive control unit 40 obtains it by AAA (Adaptive Array Antenna) processing. That is, the reception weight adaptive control unit 40 functions as a reception control unit that controls the polarization plane and directivity of the antenna 54 as a reception antenna by adaptive array processing.
  • AAA Adaptive Array Antenna
  • the transmission weight control unit 36 first sets the directivity of the transmission signal transmitted by the antenna 54 to a wide angle. For example, among the three antenna element sets 52 provided in the antenna 54, the antenna element 18d of the antenna element set 52b disposed in the center is controlled to transmit a transmission signal that is vertically polarized. At this time, the transmission signal is not transmitted from the antenna element 18c and the remaining two antenna element sets 52a and 52c.
  • a reply signal returned from the wireless tag 14 is received according to the transmission signal transmitted by this transmission operation and the determination of the reception quality determination unit regarding the received signal is denied, that is, the received signal strength detection
  • the received signal intensity detected by the unit 50 is less than a predetermined value
  • the polarization plane of the transmission signal transmitted by the antenna 54 is switched.
  • control is performed so as to transmit a transmission signal that is horizontally polarized from the antenna element 18c of the antenna element set 52b disposed in the center.
  • transmission signals are not transmitted from the antenna element 18d and the remaining two antenna element sets 52a and 52c.
  • the reception wait adaptive control unit 40 Based on the result of adaptive processing, switching is performed so as to control the polarization plane and directivity of the transmission signal. For example, in the first transmission and the second transmission, the reception is performed.
  • the AAA convergence weight with the higher received signal strength detected by the received signal strength detector 50 is set as the transmission weight, and the three antenna element sets 52a, 52b, 52c provided in the antenna 54 are used. Control to transmit a transmission signal having a predetermined polarization plane and directivity.
  • FIG. 9 is a diagram for explaining the configuration of the wireless tag 14. As shown in FIG. 9, the wireless tag 14 processes an antenna unit 76 for transmitting / receiving a signal to / from the wireless tag communication device 12 and a signal received by the antenna unit 76. And an IC circuit part 78.
  • the IC circuit unit 78 includes a rectification unit 80 that rectifies the interrogation wave F received by the antenna unit 76, a power supply unit 82 that accumulates the energy of the interrogation wave F rectified by the rectification unit 80, and A clock extraction unit 84 that extracts a clock signal from a carrier wave received by the antenna unit 76 and supplies the clock signal to the control unit 90; a memory unit 86 that functions as an information storage unit that can store a predetermined information signal; and the antenna A modulation / demodulation unit 88 connected to the unit 76 for modulating and demodulating a signal, and a control unit for controlling the operation of the wireless tag 14 via the rectification unit 80, the clock extraction unit 84, the modulation / demodulation unit 88, etc.
  • the control unit 90 performs control to store the predetermined information in the memory unit 86 by performing communication with the RFID tag communication device 12, and the modulation / demodulation of the interrogation wave F received by the antenna unit 76. Based on the information signal stored in the memory unit 86, the unit 88 performs basic control such as control to reflect and return the response wave F as a response wave F from the antenna unit 76.
  • FIG. 10 is a flowchart for explaining RFID (Radio Frequency Identification) communication control with the wireless tag 14 by the wireless tag communication device 12, and is repeatedly executed at a predetermined cycle.
  • RFID Radio Frequency Identification
  • step a command bit string corresponding to a transmission signal to the wireless tag 14 is obtained.
  • the command bit string is generated and encoded by the FSK method (which is not limited to the FSK method, which may be pulse width modulation).
  • S2 corresponding to the operation of the AM modulation unit 32
  • the signal generated and encoded in S1 is modulated in AM format.
  • S3 the signal modulated in S2 is the first memory section 24. Is written to.
  • SA corresponding to the operation of the transmission weight control unit 36
  • transmission weight setting control shown in FIG. 11 is performed.
  • S4 it is determined whether or not normal decoding has been performed in SB7 shown in FIG. If the determination of S4 is negative, the routine is terminated when the determination of the force S4 for executing the processing below SA again is affirmed.
  • SA1 it is determined whether or not it is the first process. If the determination of SA1 is affirmative, after the transmission weight for setting the transmission signal as a non-directional vertical polarization is set in SA2, the control is returned to the control shown in FIG. If the determination is negative, in SA3, it is determined whether or not the second process is power. If the determination at SA3 is affirmative, after the transmission weight for setting the transmission signal as a horizontally polarized wave having a relatively wide directivity is set at SA4, the control returns to the control shown in FIG. If the determination of the force SA3 is negative, it is determined in SA5 whether or not it is the third processing.
  • the AAA convergence weight in the case where the received signal strength detected by the received signal strength detector 50 in the first processing and the second processing is greater. 10 is set as the transmission weight, the control returns to the control shown in FIG. 10. However, if the determination of SA5 is negative, the process ends with an error.
  • a reception signal is read from the second memory unit 26 in SB1.
  • SB2 a predetermined reception weight is multiplied by the reception weight multiplying unit 38 to the reception signal read out in SB1, and a composite output Y is calculated.
  • SB3 the difference between the error signal, that is, the combined output Y calculated in SB2 and the reference signal output from the reference signal generation unit 42 is obtained.
  • SB4 the error signal obtained in SB3 is substituted into a predetermined gradual equation for updating the weight, and the set value of the reception weight is updated.
  • SB5 it is determined whether the weight has converged.
  • SB5 If the determination of SB5 is denied, the processing below SB1 is executed again, but if the determination of SB5 is affirmed, SB6 corresponding to the operation of the AM demodulating unit 44 changes to SB2.
  • the combined signal output is demodulated by AM method. So Then, in SB7 corresponding to the operation of the FSK decoding unit 46, after the received signal multiplied by the converged weight is decoded by the FSK method, the control is returned to the control shown in FIG.
  • the transmission antenna includes a plurality of antenna elements 18 arranged in a predetermined relative positional relationship, and can control the polarization plane and directivity of the transmission signal.
  • Antenna 54 that functions as a transmission weight control unit 36 (SA) that functions as a transmission control unit that controls the polarization plane and directivity of the transmission signal transmitted from the antenna 54.
  • SA transmission weight control unit 36
  • the plane of polarization and directivity of the transmission signal can be matched to the wireless tag 14. That is, it is possible to provide the wireless tag communication device 12 that realizes highly sensitive communication regardless of the relative positional relationship with the wireless tag 14.
  • a receiving antenna that includes a plurality of antenna elements 18 arranged in a predetermined relative positional relationship, and can receive signals with a polarization plane and directivity controlled so as to be suitable for a return signal from the wireless tag 14
  • Communication antenna 54 and a reception wait adaptive control unit 40 (SB) that functions as a reception control unit that controls the polarization plane and directivity of the antenna 54 by adaptive array processing. It can be received with the optimal polarization plane and directivity for the return signal of the target wireless tag 14.
  • the transmission weight control unit 36 controls the transmission signal transmitted from the antenna 54 so as to have any power of vertical polarization, horizontal polarization, and circular polarization. Regardless of the relative position of the wireless tag 14 that is the communication target, it is possible to reduce the sensitivity fluctuation due to the polarization plane of the transmission signal with respect to the wireless tag 14.
  • the transmission weight control unit 36 includes a reception signal strength detection unit 50 that functions as a reception quality determination unit that determines whether or not a reception signal received by the antenna 54 has a predetermined quality.
  • a reception signal strength detection unit 50 that functions as a reception quality determination unit that determines whether or not a reception signal received by the antenna 54 has a predetermined quality.
  • the transmission weight control unit 36 first sets the transmission signal transmitted from the antenna 54 to a vertical polarization that is a first polarization, and receives the received signal detected by the received signal strength detection unit 50. When it is determined that the intensity is less than the predetermined value, the transmission signal transmitted by the antenna 54 is switched to the horizontal polarization that is the second polarization. Higher sensitivity communication with tag 14 can be realized.
  • the antenna element 18 is a linearly polarized antenna, and includes a plurality of antenna element sets 52 each having a pair of linearly polarized antenna forces arranged so as to be orthogonal to each other.
  • a practical antenna 54 capable of controlling the wavefront and directivity can be configured.
  • the antenna element 18 is a linear dipole antenna
  • a practical antenna 54 capable of controlling the plane of polarization and directivity can be configured.
  • the plurality of sets of antenna element sets 52 are arranged in the same plane so that one linearly polarized antenna included in each of the antenna element sets 52 is aligned along a straight line. Therefore, a practical antenna 54 capable of controlling the polarization plane and directivity can be configured.
  • the plurality of antenna elements 18 are antenna elements that are shared for transmission and reception in the antenna 54 that functions as a transmission antenna and a reception antenna, the antenna configuration of the RFID tag communication apparatus 12 is possible. It can be as simple as possible.
  • FIG. 13 is a flowchart illustrating transmission weight setting control executed as an alternative to the control shown in FIG. 11 in the RFID communication control shown in FIG. 10 described above.
  • SA7 it is determined whether or not it is the first process. To be judged. If the determination of SA7 is affirmed, after the transmission weight for setting the transmission signal to circular polarization is set in SA8, the control returns to the control shown in FIG. 10, but the determination of SA7 is denied. In this case, in SA9, it is determined whether or not it is the second processing. If the determination of SA9 is affirmative, the determination of force SA10 to be returned to the control shown in FIG. 10 is denied after the AAA convergence weight in the previous received signal processing is set as the transmission weight in SA10. If so, it is terminated with an error.
  • the transmission weight control unit 36 first sets the transmission signal transmitted by the antenna 54 to circular polarization, and the received signal strength detection unit 50 When it is determined that the detected received signal strength is less than a predetermined value, the polarization plane and directivity of the transmitted signal are controlled based on the result of adaptive processing of the received signal by the received adaptive adaptive control unit 40. Therefore, the processing time required for the communication can be shortened.
  • FIG. 14 is a diagram showing an antenna 92 provided in the wireless tag communication device 12 as an alternative to the antenna 54 shown in FIG. 4 described above.
  • the antenna element set 52a in which a pair of the antenna elements 18a and 18b are combined in an X shape so as to be orthogonal to each other
  • the antenna element set 52b is combined in an X shape so that 18c and 18d are orthogonal to each other
  • the antenna element set 52c is combined in an X shape so that the antenna elements 18e and 18f are orthogonal to each other.
  • the linearly polarized antennas included in each of the three antenna element sets 52 are parallel to the corresponding linearly polarized antennas included in the other antenna element sets 52 and are in the same plane.
  • the antenna 92 configured in this manner differs from the antenna 54 arranged in a cross shape as shown in FIG. 4 described above in terms of the weights to be multiplied by the transmission signal and the reception signal. Control the polarization plane and directivity in the same way can do.
  • the plurality of antenna element sets 52 include the linearly polarized antennas included in the antenna element sets 52 in the other antenna element sets 52, respectively. Therefore, a practical antenna 92 capable of controlling the plane of polarization and the directivity can be configured.
  • the antenna 92 is disposed in parallel with the corresponding linearly polarized antenna.
  • FIG. 15 is a diagram showing still another antenna 94 provided in the RFID tag communication apparatus 12 as an alternative to the antenna 54 shown in FIG. 4 described above.
  • the antenna 94 provided in the RFID tag communication apparatus 12 of the present embodiment is composed of six antenna element sets 52a to 52f, and two of the six antenna sets are antennas.
  • the element sets 52b and 52e share one antenna element 18.
  • three first antenna element set groups that is, antenna element sets 52a to 52c are arranged so that one linearly polarized antenna included in each of the antenna element sets 52 is in a straight line (y axis in FIG. 15). Are arranged in the same first plane (in the yz plane in FIG.
  • FIG. 17 is a modified example of the antenna 94 shown in FIG. 16. Of the six antenna element sets 52a to 52f, two antenna element sets 52c and 52f share one antenna element 18. It is an aspect. As described above, according to the fourth embodiment, it is possible to configure a practical antenna 94 capable of suitably controlling directivity in the polarization plane and a wide angle range.
  • FIG. 17 is a diagram showing still another antenna 96 provided in the RFID tag communication apparatus 12 as an alternative to the antenna 54 shown in FIG. 4 described above.
  • the antenna 96 provided in the RFID tag communication apparatus 12 of the present embodiment is composed of nine antenna elements 18a to 18i each of which is a linear dipole antenna.
  • Book first die Pole antenna groups that is, antenna elements 18a to 18f, are arranged in a first plane (xy plane in FIG. 17) so as to be aligned along a pair of straight lines that intersect each other.
  • the antenna elements 18a to 18c are arranged so as to be arranged along a straight line
  • the antenna elements 18d to 18f are arranged so as to be arranged along another straight line that intersects the straight line. ing.
  • three second dipole antenna groups ie, antenna elements 18g to 18i are parallel to each other in the second plane (yz plane in FIG. 17) orthogonal to the first plane and perpendicular to the first plane. It is arranged to form.
  • the practical antenna 96 capable of controlling the plane of polarization and directivity can be configured.
  • the direction in the plane of polarization parallel to the first plane can be configured.
  • the sex control range can be expanded.
  • FIG. 18 is a diagram showing still another antenna 98 provided in the RFID tag communication apparatus 12 as an alternative to the antenna 54 shown in FIG. 4 described above.
  • the antenna 98 provided in the RFID tag communication apparatus 12 of the present embodiment is composed of 12 antenna element sets 52a to 521, and the antenna 94 in FIG. It is an extended version. That is, the antenna element sets 52g to 521 are arranged on the third straight line (z-axis in FIG. 18) in addition to the first straight line (y-axis in FIG. 18) and the second straight line (X-axis in FIG. 18). Is done.
  • 52h is shared with the antenna element set 52b on the first straight line
  • 52k is shared with the antenna element set 52e on the third straight line.
  • the antenna element sets 52 g and 52j, 52i and 521 share one antenna element 18, respectively.
  • the directivity can be suitably controlled over a wide angle range in the plane including the polarization plane and the first straight line and the second straight line, and the directivity can also be achieved in the plane including the third straight line.
  • a practical antenna 98 capable of controlling the frequency can be configured.
  • a pair of antenna elements 18 are arranged in a cross shape, or as shown in FIG.
  • the antenna is arranged in a predetermined relative positional relationship. It is sufficient that the antenna has a plurality of antenna element forces and can control the plane of polarization and the directivity.
  • An antenna composed of a polarized antenna element may be provided in the RFID tag communication apparatus of this embodiment.
  • the configuration using the antenna element 18 that is a linear dipole antenna has been described.
  • an antenna element that may include a planar antenna such as a notch antenna may be used.
  • the embodiment is not particularly limited.
  • the transmission weight multiplication unit 34, the transmission weight control unit 36, the reception weight multiplication unit 38, the reception weight adaptive control unit 40, and the like are provided as control functions of the DSP 16.
  • the force that was provided may be provided as a separate control device from the DSP 16.
  • the processing by these control units may be based on digital signal processing or analog signal processing.
  • the reception signal strength detection unit 50 is included as a reception quality determination unit.
  • the decoding quality of the reception signal by the FSK decoding unit 46 is within a predetermined range.
  • An error determination unit or the like that determines whether or not the power is a reception quality determination unit may be provided.

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Radio Transmission System (AREA)
  • Variable-Direction Aerials And Aerial Arrays (AREA)
  • Near-Field Transmission Systems (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

L'invention concerne un dispositif de communication d’étiquette radio pouvant assurer une communication de haute sensibilité ne dépendant pas de la relation de position relative avec l’étiquette radio. Le dispositif de communication d’étiquette radio comprend une antenne (54) constituée d’une multitude d’éléments d’antenne (18) disposée selon une relation de position relative prédéterminée et pouvant contrôler le plan de polarisation et la directivité du signal d’émission et une unité de commande de poids d’émission (36) pour commander le plan de polarisation et la directivité du signal d’émission émis par l’antenne (54). En accord, quelle que soit la position relative de l’étiquette radio (14) en tant qu’objet de communication, il est possible d’adapter à l’étiquette radio (14) le plan de polarisation et la directivité du signal d’émission. Autrement dit, il est possible de proposer un dispositif de communication d’étiquette radio (12) pouvant assurer une communication de haute sensibilité ne dépendant pas de la relation de position relative avec l’étiquette radio (14).
PCT/JP2005/016898 2004-09-29 2005-09-14 Dispositif de communication d’étiquette radio WO2006035598A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2004-283526 2004-09-29
JP2004283526A JP2006101080A (ja) 2004-09-29 2004-09-29 無線タグ通信装置

Publications (1)

Publication Number Publication Date
WO2006035598A1 true WO2006035598A1 (fr) 2006-04-06

Family

ID=36118750

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/JP2005/016898 WO2006035598A1 (fr) 2004-09-29 2005-09-14 Dispositif de communication d’étiquette radio

Country Status (2)

Country Link
JP (1) JP2006101080A (fr)
WO (1) WO2006035598A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2014178783A (ja) * 2013-03-13 2014-09-25 Ricoh Co Ltd 通信装置及び通信システム

Families Citing this family (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7460077B2 (en) * 2006-12-21 2008-12-02 Raytheon Company Polarization control system and method for an antenna array
JP2008271443A (ja) * 2007-04-24 2008-11-06 Brother Ind Ltd 無線送信装置及び無線通信装置
JP2012094931A (ja) * 2009-02-18 2012-05-17 Panasonic Corp テレビ受信装置
EP2670061B1 (fr) * 2011-01-06 2015-09-16 Thomson Licensing Terminal central pour la transmission de signaux dans un environnement domestique
JP5708391B2 (ja) * 2011-09-10 2015-04-30 株式会社デンソーウェーブ 無線タグリーダおよび監視システム
US9000894B2 (en) * 2012-07-31 2015-04-07 Symbol Technologies, Inc. Method and apparatus for improving reception of an RFID tag response
FR3013907B1 (fr) * 2013-11-27 2016-01-01 Michelin & Cie Systeme de lecture dynamique de donnees de transpondeurs
WO2016001951A1 (fr) 2014-07-02 2016-01-07 ソフトバンク株式会社 Dispositif de contrôle de transmission, et programme
JP6243830B2 (ja) * 2014-12-03 2017-12-06 日本電信電話株式会社 情報端末及び無線通信方法

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH088641A (ja) * 1994-02-02 1996-01-12 Hughes Aircraft Co 固定された双極子および回転カップを有する走査カップ双極子アンテナ
JPH0998019A (ja) * 1995-09-30 1997-04-08 Nippon Dengiyou Kosaku Kk 偏波共用アンテナ
JPH09153721A (ja) * 1995-11-30 1997-06-10 Nec Corp アレイアンテナ装置
JPH1075196A (ja) * 1996-08-30 1998-03-17 Sharp Corp 移動体識別装置及びダイバーシティ方法
JP2000124733A (ja) * 1998-10-16 2000-04-28 Ntt Mobil Communication Network Inc 基地局アンテナ装置
JP2002026790A (ja) * 2000-07-03 2002-01-25 Matsushita Electric Ind Co Ltd 無線通信装置及び無線通信方法
WO2002051034A1 (fr) * 2000-12-21 2002-06-27 Matsushita Electric Industrial Co., Ltd. Dispositif a station de base
JP2004507850A (ja) * 2000-08-25 2004-03-11 アールエフ・コード・インコーポレーテッド 多重信号組み合わせを用いた識別装置検出

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP3122267B2 (ja) * 1992-12-24 2001-01-09 株式会社日立国際電気 ダイバーシチ通信方式
JP3039637B2 (ja) * 1998-07-10 2000-05-08 日本電気株式会社 無線基地局装置とその送信電力制御方式
JP2001244860A (ja) * 2000-03-01 2001-09-07 Hitachi Kokusai Electric Inc 受信機
JP3926561B2 (ja) * 2000-12-28 2007-06-06 株式会社エヌ・ティ・ティ・ドコモ 移動通信システム
JP3888424B2 (ja) * 2001-06-01 2007-03-07 日本電気株式会社 適応アンテナ受信装置
JP3886445B2 (ja) * 2002-11-28 2007-02-28 Ｎｅｃインフロンティア株式会社 無線ｌａｎアクセスポイント、及びその動作方法

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH088641A (ja) * 1994-02-02 1996-01-12 Hughes Aircraft Co 固定された双極子および回転カップを有する走査カップ双極子アンテナ
JPH0998019A (ja) * 1995-09-30 1997-04-08 Nippon Dengiyou Kosaku Kk 偏波共用アンテナ
JPH09153721A (ja) * 1995-11-30 1997-06-10 Nec Corp アレイアンテナ装置
JPH1075196A (ja) * 1996-08-30 1998-03-17 Sharp Corp 移動体識別装置及びダイバーシティ方法
JP2000124733A (ja) * 1998-10-16 2000-04-28 Ntt Mobil Communication Network Inc 基地局アンテナ装置
JP2002026790A (ja) * 2000-07-03 2002-01-25 Matsushita Electric Ind Co Ltd 無線通信装置及び無線通信方法
JP2004507850A (ja) * 2000-08-25 2004-03-11 アールエフ・コード・インコーポレーテッド 多重信号組み合わせを用いた識別装置検出
WO2002051034A1 (fr) * 2000-12-21 2002-06-27 Matsushita Electric Industrial Co., Ltd. Dispositif a station de base

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2014178783A (ja) * 2013-03-13 2014-09-25 Ricoh Co Ltd 通信装置及び通信システム

Also Published As

Publication number Publication date
JP2006101080A (ja) 2006-04-13

Similar Documents

Publication Publication Date Title
CN101038618B (zh) 一种rfid阅读器智能天线系统
US6717516B2 (en) Hybrid bluetooth/RFID based real time location tracking
JP4293027B2 (ja) 無線タグ通信装置
WO2006064647A1 (fr) Dispositif radio et dispositif de communication de balise radio
WO2006013677A1 (fr) Appareil de réception radio
WO2006035598A1 (fr) Dispositif de communication d’étiquette radio
WO2006103834A1 (fr) Appareil de communication d’étiquette sans fil
JP2008045954A (ja) 方向検出装置
WO2005104142A1 (fr) Dispositif de communication radio par marqueurs
JP2006041929A (ja) 無線受信装置
JP2002353852A (ja) 無線通信装置および無線通信システム
JP2008048077A (ja) 無線通信装置
JP4982966B2 (ja) 無線タグ検出システム
JP4770128B2 (ja) 無線タグ通信装置
JP5137128B2 (ja) Ｒｆｉｄリーダライタ
WO2005076497A1 (fr) Appareil de communication par etiquette sans fil
JP2006050477A (ja) 無線タグ通信装置
WO2008018253A1 (fr) Dispositif de détection de la direction
JP4534655B2 (ja) 無線受信装置
JP2006352788A (ja) 無線タグ通信装置
JP5316509B2 (ja) Ｉｃタグ用リーダ及び／又はライタ
JP4403905B2 (ja) 無線通信装置
WO2008018254A1 (fr) Dispositif de communication sans fil
JP4670556B2 (ja) 通信装置および方法
JPH11266176A (ja) 受動型トランスポンダ装置およびその動作方法

Legal Events

Date Code Title Description
AK Designated states

Kind code of ref document: A1

Designated state(s): AE AG AL AM AT AU AZ BA BB BG BR BW BY BZ CA CH CN CO CR CU CZ DE DK DM DZ EC EE EG ES FI GB GD GE GH GM HR HU ID IL IN IS KE KG KM KP KR KZ LC LK LR LS LT LU LV MA MD MG MK MN MW MX MZ NA NG NI NO NZ OM PG PH PL PT RO RU SC SD SE SG SK SL SM SY TJ TM TN TR TT TZ UA UG US UZ VC VN YU ZA ZM ZW

AL Designated countries for regional patents

Kind code of ref document: A1

Designated state(s): BW GH GM KE LS MW MZ NA SD SL SZ TZ UG ZM ZW AM AZ BY KG KZ MD RU TJ TM AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HU IE IS IT LT LU LV MC NL PL PT RO SE SI SK TR BF BJ CF CG CI CM GA GN GQ GW ML MR NE SN TD TG

121 Ep: the epo has been informed by wipo that ep was designated in this application
NENP Non-entry into the national phase

Ref country code: DE

122 Ep: pct application non-entry in european phase
点击 这是indexloc提供的php浏览器服务，不要输入任何密码和下载