WO2006008816A1 - 非接触型端末及びリーダライタ装置 - Google Patents
非接触型端末及びリーダライタ装置 Download PDFInfo
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- WO2006008816A1 WO2006008816A1 PCT/JP2004/010414 JP2004010414W WO2006008816A1 WO 2006008816 A1 WO2006008816 A1 WO 2006008816A1 JP 2004010414 W JP2004010414 W JP 2004010414W WO 2006008816 A1 WO2006008816 A1 WO 2006008816A1
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- antenna element
- radio wave
- power
- frequency
- antenna
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Classifications
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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
- G06K7/0008—General problems related to the reading of electronic memory record carriers, independent of its reading method, e.g. power transfer
Definitions
- Non-contact type terminal and reader / writer device
- the present invention when receiving a radio wave transmitted from a reader / writer device, rectifies the received signal, charges power, and operates using the power, a contactless terminal, and a contactless terminal.
- the present invention relates to a reader / writer device that transmits and receives radio waves.
- the detector rectifies the radio wave and stores the power in a capacitor, etc., to secure driving power.
- the RF-ID tag subsequently uses the power stored in the capacitor to transmit and receive radio waves to and from the reader / writer device.
- RF-ID tag power For example, when mounted on an IC card or the like, depending on the orientation of the IC card with respect to the reader / writer device, radio wave reception sensitivity may deteriorate.
- a Schottky barrier diode By connecting via a Schottky barrier diode, a circular polarization plane is formed to eliminate the angle dependence (for example, see Patent Document 1).
- the frequency of the radio wave assigned to the RF-ID tag varies from country to country, and design changes such as changing the antenna length are required when shipping the RF-ID tag.
- RF—An antenna that is not an ID tag antenna can be operated at a desired frequency according to the device to be communicated.
- a variable capacitor is installed at the connection point of the radiation plate, and the variable capacitor is operated manually. Then, an antenna device capable of adjusting the radiation resistance value of the radiation plate is disclosed in Patent Document 2 below.
- Patent Document 1 Japanese Patent Laid-Open No. 5-282505 (paragraph numbers [0011] to [0015], FIG. 1)
- Patent Document 2 Japanese Patent Laid-Open No. 2000-124728 (paragraph numbers [0013] to [0017], FIG. 1)
- the conventional non-contact type terminal is configured as described above, it is suitable for a reader / writer device. Even if the direction of the signal changes, it is possible to prevent the radio wave reception sensitivity from deteriorating.
- the frequency of radio waves transmitted to and received from the reader / writer device is limited to a specific frequency, and there is a problem that requires a design change such as changing the length of the antenna in order to support other frequencies. .
- the frequency can be changed by manually operating the variable capacitor, but the technology for automatically changing the frequency is provided.
- the present invention has been made to solve the above-described problems, and an object of the present invention is to obtain a non-contact type terminal capable of supporting a plurality of frequencies when transmitting / receiving radio waves to / from a reader / writer device. To do.
- Another object of the present invention is to provide a reader / writer device that can initialize a non-contact type terminal.
- a non-contact type terminal detects a radio wave received by a plurality of antenna elements and measures the power of each radio wave, and a power measurement unit that measures the power of each radio wave.
- the antenna elements are selected by the antenna element selection means by comparing the power with each other and selecting the antenna element that receives the radio wave having the maximum power from the plurality of antenna elements.
- An antenna element is used to transmit and receive radio waves with the reader / writer device.
- FIG. 1 is a configuration diagram showing a system including a non-contact terminal and a reader / writer device according to Embodiment 1 of the present invention.
- FIG. 2 is a configuration diagram showing a contactless terminal according to Embodiment 1 of the present invention.
- FIG. 3 is a block diagram showing a reader / writer device according to Embodiment 1 of the present invention.
- FIG. 4 is a configuration diagram showing a contactless terminal according to Embodiment 4 of the present invention.
- FIG. 5 is a configuration diagram showing a contactless terminal according to Embodiment 5 of the present invention.
- FIG. 6 is a configuration diagram showing a contactless terminal according to Embodiment 6 of the present invention.
- FIG. 7 is a configuration diagram showing a contactless terminal according to Embodiment 7 of the present invention.
- FIG. 8 is a configuration diagram showing a non-contact type terminal according to Embodiment 8 of the present invention.
- FIG. 1 is a block diagram showing a system comprising a contactless terminal and a reader / writer device according to Embodiment 1 of the present invention.
- FIG. 2 is a block diagram showing a contactless terminal according to Embodiment 1 of the present invention
- FIG. 3 is a block diagram showing a reader / writer device according to Embodiment 1 of the present invention.
- the contactless terminal 1 corresponds to, for example, an RF-ID tag attached to a product or the like.
- the received signal is rectified to generate power. Charge and operate using that power.
- the reader / writer device 2 transmits / receives radio waves to / from the contactless terminal 1 and reads / writes data stored in the memory of the contactless terminal 1.
- the antenna element 11 of the non-contact type terminal 1 is a microstrip antenna whose frequency to be excited is fl.
- the antenna element 12 of the contactless terminal 1 is a microstrip antenna whose frequency to be excited is f2.
- the antenna element 13 of the contactless terminal 1 is a microstrip antenna whose frequency to be excited is f3.
- the antenna elements 11 and 13 are shown as being microstrip antennas, but other types of antennas are not limited thereto.
- the switching switch 14 of the non-contact type terminal 1 connects any one of the antenna elements 11 to 13 with the detector 15 under the instruction of the antenna element selector 19.
- the detector 15 of the contactless terminal 1 detects the radio wave received by the antenna elements 11-13.
- the rectifier 16 of the non-contact type terminal 1 rectifies the radio wave detected by the detector 15 for driving. Is generated and stored in the power storage unit 17.
- the rectifier 16 rectifies the radio wave detected by the detector 15, but the rectifier 16 rectifies the radio wave received by the antenna elements 11 and 13, and the detector 15 becomes the rectifier 16.
- the radio wave rectified by may be detected.
- the detector 15 may incorporate the rectifying unit 16.
- the power storage unit 17 of the non-contact type terminal 1 is composed of, for example, a capacitor and stores power.
- the power measurement unit 18 of the contactless terminal 1 operates using the power stored in the power storage unit 17 as a drive source, measures the power of the radio wave detected by the detector 15, and stores the measurement result in the internal memory. To store.
- the detector 15 and the power measuring unit 18 constitute power measuring means.
- the antenna element selection unit 19 of the non-contact type terminal 1 operates using the power stored in the power storage unit 17 as a drive source, and issues a switching command for instructing to sequentially switch the connection target of the detector 15. Output to selector switch 14. Also, the power of each radio wave stored in the internal memory of the power measuring unit 18 is compared with each other, and the antenna element receiving the radio wave with the maximum power is selected from the antenna elements 11 and 13. . For example, if the antenna element receiving the radio wave with the maximum power is the antenna element 12, a setting command for instructing to set the connection target of the detector 15 to the antenna element 12 is output to the switching switch 14.
- the switching element 14 and the antenna element selector 19 constitute antenna element selecting means.
- the transmission / reception processing unit 20 of the non-contact type terminal 1 operates using the power stored in the power storage unit 17 as a drive source, and uses the antenna element selected by the antenna element selection unit 19 to perform the reader / writer In addition to transmitting / receiving radio waves to / from the device 2 , the radio waves are modulated and demodulated.
- the transmission / reception processing unit 20 constitutes transmission / reception means.
- the memory 21 of the non-contact type terminal 1 stores, for example, a product identification code and a test result.
- the IC 30 is mounted with a switching switch 14, a detector 15, a rectifier 16, a power storage unit 17, a power measurement unit 18, an antenna element selection unit 19, a transmission / reception processing unit 20, a memory 21, and the like.
- the transmission processing unit 32 of the reader / writer device 2 detects the non-contact type terminal 1 existing in the vicinity under the instruction of the terminal detection unit 34, the transmission processing unit 32 is used for detection of power greater than the reference level S from the antenna 31. Radiates radio waves.
- a signal level radio wave is radiated from the antenna 31.
- the reception processing unit 33 of the reader / writer device 2 performs reception processing of response radio waves to the detection radio waves transmitted from the non-contact type terminal 1. In addition, reception processing of signal radio waves transmitted from contactless terminal 1 is performed.
- the terminal detection unit 34 of the reader / writer device 2 receives the response radio wave transmitted from the non-contact type terminal 1, and the reception processing unit 33 When receiving processing is performed, the presence of the contactless terminal 1 is detected.
- the antenna 31, the transmission processing unit 32, and the terminal detection unit 34 constitute detection radio wave transmission means.
- the antenna 31, the reception processing unit 33, and the terminal detection unit 34 constitute detection means.
- the communication control unit 35 of the reader / writer device 2 instructs the transmission processing unit 32 to transmit a signal radio wave having a power level of reference level S to the non-contact type terminal 1 whose presence is detected by the terminal detection unit 34.
- the reception processing unit 33 is instructed to perform reception processing of signal radio waves transmitted from the non-contact type terminal 1.
- the transmission processing unit 32, the reception processing unit 33, and the communication control unit 35 constitute signal radio wave transmission / reception means.
- the memory 36 of the reader / writer device 2 stores data to be written to the contactless terminal 1 and data acquired from the contactless terminal 1.
- the reader / writer device 2 radiates detection radio waves having a power higher than the reference level S from the antenna 31 at regular intervals in order to detect the non-contact type terminal 1 existing in its own communication area.
- the transmission processing unit 32 of the reader / writer device 2 performs, for example, a certain amount under the instruction of the terminal detection unit 34. Every time, antenna 31 emits radio waves for detection that have higher power than reference level S.
- the reason why the power of the detection radio wave is larger than the reference level S is to enable the detection radio wave to be received by any of the antenna elements 11 and 13 having different excitation frequencies. That is, when the power of the detection radio wave is large, the detection radio wave can be received even if the frequency of the detection radio wave is slightly different from the frequency of the antenna element.
- the rectification unit 16 of the non-contact terminal 1 rectifies the detection radio wave to generate driving power, and the power is generated. Stored in the power storage unit 17.
- the power measurement unit 18 of the contactless terminal 1 operates using the power stored in the power storage unit 17 as a drive source, and the detection radio wave detected by the detector 15 (received by the antenna element 11). Power of the detected radio wave) and the measurement result is stored in the internal memory.
- the antenna element selection unit 19 of the non-contact type terminal 1 operates using the power stored in the power storage unit 17 as a drive source, and the power measurement unit 18 uses the power of the detection radio wave received by the antenna element 11.
- a switching command instructing to switch the connection target of the detector 15 to the antenna element 12 is output to the switching switch 14.
- the detector 15 of the non-contact type terminal 1 detects the detection radio wave received by the antenna element 12.
- the power measurement unit 18 of the non-contact terminal 1 measures the power of the detection radio wave detected by the detector 15 (the detection radio wave received by the antenna element 12) and stores the measurement result in the internal memory. To do.
- the antenna element selection unit 19 of the contactless terminal 1 sets the connection target of the detector 15 to the antenna element 13.
- a switch command instructing switching is output to switch 14.
- the detector 15 of the non-contact type terminal 1 detects the detection received by the antenna element 13. Detect radio waves for use.
- the power measurement unit 18 of the contactless terminal 1 measures the power of the detection radio wave detected by the detector 15 (the detection radio wave received by the antenna element 13) and stores the measurement result in the internal memory. To do.
- the antenna element selection unit 19 of the contactless terminal 1 is stored in the internal memory of the power measurement unit 18. Compare the power of each radio wave with each other.
- the power of the detection radio wave received by the antenna element 11, the power of the detection radio wave received by the antenna element 12, and the power of the detection radio wave received by the antenna element 13 are compared with each other.
- the antenna element selection unit 19 of the non-contact terminal 1 selects an antenna element receiving the radio wave having the maximum power from the antenna elements 11-13.
- a setting command for instructing to set the connection target of the detector 15 to the antenna element 12 is output to the switching switch 14.
- the switching switch 14 of the non-contact type terminal 1 is connected to the antenna element selector 19 from the detector 1 for example.
- connection target of the detector 15 When receiving a setting command instructing to set the connection target of 5 to the antenna element 12, the connection target of the detector 15 is set to the antenna element 12.
- the transmission / reception processing unit 20 of the non-contact type terminal 1 operates using the power stored in the power storage unit 17 as a drive source, and the switching switch 14 sets the connection target of the detector 15 to the antenna element 12. If it is determined, a response radio wave to the detection radio wave is radiated from the antenna element 12.
- the response radio wave includes, for example, HD information for identifying the contactless terminal 1.
- the reception processing unit 33 of the reader / writer device 2 performs a reception process such as demodulating the response radio wave, thereby performing a non-contact type Get ro information to identify terminal 1.
- the terminal detection unit 34 of the reader / writer device 2 receives the response radio wave transmitted from the non-contact type terminal 1 after the detection radio wave is radiated from the antenna 31, and the reception processing unit 33 performs the reception process. When implemented, the presence of the contactless terminal 1 is detected. Further, the terminal detection unit 34 specifies the non-contact type terminal 1 from the information acquired by the reception processing unit 33 and stores the ro information in the memory 36.
- the communication control unit 35 of the reader / writer device 2 instructs the transmission processing unit 32 to transmit signal radio waves to the non-contact type terminal 1. To do.
- the signal radio wave includes a transmission request signal for requesting transmission of data stored in the memory 21 of the non-contact type terminal 1 or the data stored in the memory 21 of the non-contact type terminal 1.
- a rewrite request signal for requesting rewrite is included, or a case where a write request signal for requesting writing of new data in the memory 21 of the non-contact type terminal 1 is included.
- a storage request signal that instructs the power storage unit 17 of the contactless terminal 1 to store power.
- the transmission processing unit 32 of the reader / writer device 2 When the transmission processing unit 32 of the reader / writer device 2 receives a signal radio wave transmission command from the communication control unit 35, it emits a signal radio wave having a reference level S from the antenna 31.
- the reason why the power of the signal radio wave is at the reference level S is that the connection target of the detector 15 is
- the detector 15 of the non-contact terminal 1 detects the signal radio wave.
- the rectifier 16 of the non-contact terminal 1 When the detector 15 detects the signal radio wave including the accumulation request signal, the rectifier 16 of the non-contact terminal 1 generates the driving power by rectifying the signal radio wave, and uses the power as power. Accumulate in accumulation unit 17.
- the transmission / reception processing unit 20 of the contactless terminal 1 operates using the power stored in the power storage unit 17 as a drive source, and the detector 15 detects the signal radio wave including the transmission request signal. If there is, the data stored in the memory 21 is acquired, and the signal radio wave including the data is radiated from the antenna element 12.
- the transmission / reception processing unit 20 of the contactless terminal 1 stores the signal in the memory 21 according to the rewrite request signal. Rewrite the data.
- the transmission / reception processing unit 20 of the contactless terminal 1 stores new data in the memory 21 according to the write request signal. To do.
- the reception processing unit 33 of the reader / writer apparatus 2 performs a reception process such as demodulating the signal radio wave.
- the second communication control unit 35 stores the data contained in the signal radio wave in the memory 36.
- the power measuring unit 18 that measures the radio waves received by the antenna elements 11 and 13, and each radio wave measured by the power measuring unit 18.
- the antenna element selector 19 selects the antenna element that receives the radio wave with the maximum power from the antenna elements 11 and 13 and selects them by the antenna element selector 19. Since the antenna element is used to transmit and receive radio waves to and from the reader / writer device 2, when transmitting and receiving radio waves to and from the reader / writer device 2, it is possible to cope with a plurality of frequencies.
- the reader / writer device 2 radiates the detection radio wave from the antenna 31 when detecting the non-contact type terminal 1 existing in its own communication area.
- the frequency used by the writer device 2 is always the same (for example, the contactless terminal 1 is used only in Japan and may not be used in other countries).
- the antenna element is selected only once during the initialization process of the non-contact type terminal 1, and thereafter, the antenna element is used in a fixed manner.
- the reader / writer device 2 is configured to emit a detection radio wave during initialization processing when shipping the non-contact type terminal 1.
- Devices other than the reader / writer device 2 may emit detection radio waves.
- the antenna element selection unit 19 of the non-contact type terminal 1 performs the reader / writer device 2 during the initialization process.
- the antenna element that receives the radio wave with the maximum power is selected in the same manner as in the first embodiment.
- the antenna element selection unit 19 does not perform the antenna element selection process and uses the antenna element in a fixed manner.
- the antenna element is selected only once during the initialization process of the non-contact type terminal 1, and thereafter, the antenna element is used in a fixed manner.
- the antenna element is selected only once during the initialization process of the non-contact type terminal 1.
- the antenna element selection is performed only when the initialization command instructing the initialization is given. Even if you do the processing.
- FIG. 4 is a block diagram showing a contactless terminal according to Embodiment 4 of the present invention.
- the same reference numerals as those in FIG. 4 are identical to FIG. 4 in the figure.
- the antenna element 41 of the non-contact terminal 1 is a microstrip antenna whose frequency to be excited is fl, and the polarization is different from that of the antenna element 11.
- the antenna element 42 of the non-contact type terminal 1 is a microstrip antenna whose excitation frequency is f2, and is different in polarization from the antenna element 12.
- the antenna element 43 of the non-contact type terminal 1 is a microstrip antenna whose excitation frequency is f3, and is polarized differently from the antenna element 13.
- the switching switch 44 of the non-contact type terminal 1 connects any one of the antenna elements 41 and 43 to the detector 15 under the instruction of the antenna element selector 45.
- the antenna element selection unit 45 of the non-contact type terminal 1 operates using the power stored in the power storage unit 17 as a drive source, and switches to instruct to switch the connection target of the detector 15 in order.
- the command is output to switch 14 and 44.
- the power of each radio wave stored in the internal memory of the power measuring unit 18 is compared with each other, and the antenna element receiving the radio wave with the maximum power out of the antenna elements 11-11, 41-43. And an antenna element with the same excitation frequency and different polarization is selected.
- the switching elements 14 and 44 and the antenna element selection unit 45 constitute antenna element selection means.
- the antenna element that receives the radio wave with the maximum power is selected.
- the antenna element is, for example, a linearly polarized microstrip antenna
- the contactless terminal for the reader / writer device 2 is selected. If the direction of 1 changes, the reception sensitivity will deteriorate.
- the antenna element selection unit 45 of the non-contact terminal 1 operates by using the power stored in the power storage unit 17 as a drive source, and switches to instruct to switch the connection target of the detector 15 in order.
- the conversion command is output to change-over switches 14 and 44.
- connection target of the detector 15 is switched in the following order.
- Antenna element 11 Antenna element 12 ⁇ Antenna element 13 ⁇ Antenna element 41 ⁇ Antenna element 42 ⁇ Antenna element 43
- the power measurement unit 18 of the non-contact type terminal 1 measures the power of the detection radio wave detected by the detector 15 in the order described above, and stores the measurement result in the internal memory.
- the antenna element selection unit 45 of the contactless terminal 1 operates using the power stored in the power storage unit 17 as a drive source, and the power measurement unit 18 receives the detection radio wave received by the antenna element 13. Is measured, the power of each radio wave stored in the internal memory of the power measuring unit 18 is compared with each other.
- the power of the detection radio wave received by the antenna element 11 the power of the detection radio wave received by the antenna element 12, and the detection radio wave received by the antenna element 13
- the power of the detection radio wave received by the antenna element 41, the power of the detection radio wave received by the antenna element 42, and the power of the detection radio wave received by the antenna element 43 are mutually compared. To do.
- the antenna element selection unit 45 of the non-contact type terminal 1 selects an antenna element that receives the radio wave having the maximum power from the antenna elements 11 1 13 and 41 43.
- a setting command for instructing to set the connection target of the detector 15 to the antenna element 11 is output to the switching switch 14.
- the antenna element selection unit 45 selects an antenna element having the same excitation frequency as that of the antenna element but having a different polarization. For example, if the antenna element 11 is selected, the antenna element 41 is selected, and a setting command for instructing to set the connection target of the detector 15 to the antenna element 41 is output to the switching switch 44.
- the antenna element 43 is selected, the antenna element 13 is selected, and a setting command for instructing to set the connection target of the detector 15 to the antenna element 13 is output to the switching switch 14.
- the switching switch 14 of the non-contact type terminal 1 is connected to, for example, the detector 1 from the antenna element selection unit 45.
- connection target of the detector 15 When receiving a setting command instructing to set the connection target of 5 to the antenna element 11, the connection target of the detector 15 is set to the antenna element 11.
- the switching switch 44 of the non-contact type terminal 1 is connected to, for example, the detector 1 from the antenna element selection unit 45.
- connection target of the detector 15 When receiving a setting command instructing to set the connection target of 5 to the antenna element 41, the connection target of the detector 15 is set to the antenna element 41.
- the transmission / reception processing unit 20 of the non-contact type terminal 1 transmits and receives radio waves to and from the reader / writer device 2 using the two antenna elements connected to the detector 15.
- the detector 15 includes a phase shifter that matches the phases of the waves received by the two antenna elements.
- the antenna element that receives the radio wave with the maximum power is selected, and the excitation frequency is the same as that of the antenna element. Since the antenna elements having different polarizations are selected, even if the orientation of the non-contact type terminal 1 with respect to the reader / writer device 2 changes, it is possible to prevent the reception sensitivity from being deteriorated.
- the antenna element is a linearly polarized microstrip antenna.
- the antenna element is a right-hand polarized (or left-hand polarized) microstrip antenna.
- the same effect can be obtained when the fourth embodiment is applied when the antenna element is a right-hand polarized wave (or left-hand polarized wave) micro-trip antenna.
- the antenna elements 11 and 13 in addition to the antenna elements 11 and 13 having different excitation frequencies, the antenna elements 11 and 13 have the same excitation frequency, and the antenna elements 11 and 13 have different polarizations. As shown in Fig. 5, it is necessary to mount circularly polarized antenna elements 46-48 and select the antenna element receiving the radio wave with the maximum power. Even so, it is possible to achieve the same effect S as in the fourth embodiment.
- FIG. 6 is a block diagram showing a contactless terminal according to Embodiment 6 of the present invention.
- the same reference numerals as those in FIG. 1 are identical to FIG. 1 and the same reference numerals as those in FIG. 1;
- the matching circuit 51 of the contactless terminal 1 matches between the antenna element 11 and the detector 15 under the instruction of the detector 15.
- the matching circuit 52 of the contactless terminal 1 matches between the antenna element 12 and the detector 15 under the instruction of the detector 15.
- the matching circuit 53 of the contactless terminal 1 matches between the antenna element 13 and the detector 15 under the instruction of the detector 15.
- the matching circuits 51 to 53 perform matching between the antenna elements 11 and 13 and the detector 15 in order to increase the reception sensitivity of the antenna elements 11 and 13.
- Radio waves may become interference waves.
- the detector 15 cancels the matching with respect to the matching circuit provided in the antenna element not selected by the antenna element selection unit 19. Instruct.
- the antenna element selection unit 19 selects the antenna element 11
- the matching circuits 52 and 53 are instructed to cancel the matching.
- the matching circuits 52 and 53 When the matching circuits 52 and 53 receive a matching cancellation instruction from the detector 15, the matching circuits 52 and 53 cancel the matching between the antenna elements 12 and 13 and the detector 15.
- the matching circuit force provided to the antenna element that is not selected by the antenna element selector 19 cancels the matching between the antenna element and the detector 15.
- FIG. 7 is a block diagram showing a contactless terminal according to Embodiment 7 of the present invention.
- the same reference numerals as those in FIG. 7 are identical to FIG. 7 and the same reference numerals as those in FIG.
- the tuner 62 of the contactless terminal 1 operates using the power stored in the power storage unit 17 as a drive source, and sequentially switches the frequency excited by the antenna element 61 under the instruction of the frequency setting unit 63.
- the tuner 62 constitutes frequency switching means.
- the frequency setting unit 63 of the non-contact type terminal 1 operates using the power stored in the power storage unit 17 as a drive source, and instructs to switch the frequency excited by the antenna element 61 in order. Is output to tuner 62. Also, the power of each radio wave stored in the internal memory of the power measuring unit 18 is compared with each other, and the frequency excited by the antenna element 61 is set to the frequency at which the radio wave power is maximized.
- the tuner 62 and the frequency setting unit 63 constitute frequency setting means.
- the antenna element 11-11 has been shown to select the antenna element that receives the radio wave with the maximum power from the antenna elements 11-13.
- the frequency excited by 61 may be sequentially switched, and the frequency excited by antenna element 61 may be set to the frequency at which the electric power of the radio wave is maximized.
- the frequency setting unit 63 of the non-contact type terminal 1 controls the tuner 62, for example, sets a frequency of the antenna element 61 is excited to a frequency fl.
- the detector 15 detects the radio wave.
- the power measurement unit 18 of the contactless terminal 1 measures the power of the detection radio wave detected by the detector 15 and stores the measurement result in the internal memory.
- the frequency setting unit 63 of the non-contact terminal 1 controls the tuner 62 to set, for example, the frequency excited by the antenna element 61 to the frequency f2. Change to
- the detector 15 detects the radio wave.
- the power measurement unit 18 of the contactless terminal 1 measures the power of the detection radio wave detected by the detector 15 and stores the measurement result in the internal memory.
- the frequency setting unit 63 of the non-contact terminal 1 Compares the power of each radio wave stored in the internal memory of the power measuring unit 18 with each other. That is, the power of the detection radio wave at the frequency fl, the power of the detection radio wave at the frequency f2, and the power of the detection radio wave at the frequency f3 are compared with each other.
- the frequency setting unit 63 of the non-contact type terminal 1 selects the detection radio wave from the frequencies fl, f2, and f3. Select the frequency that maximizes power.
- the frequency setting unit 63 controls the tuner 62 and sets the frequency excited by the antenna element 61 to the frequency f2. .
- the transmission / reception processor 20 of the contactless terminal 1 transmits and receives radio waves to and from the reader / writer device 2 using the antenna element 61 whose frequency is set by the frequency setting unit 63.
- the frequency at which the antenna element 61 excites is sequentially switched, and the frequency at which the antenna element 61 excites is the frequency at which the electric power of the radio wave is maximized. Therefore, when transmitting / receiving radio waves to / from the reader / writer device 2, there is an effect that it is possible to cope with a plurality of frequencies.
- FIG. 8 is a block diagram showing a contactless terminal according to Embodiment 8 of the present invention.
- the same reference numerals as those in FIG. 8 are identical to FIG. 8 and the same reference numerals as those in FIG.
- connection switch 74 of the contactless terminal 1 is inserted in series between the antenna element 71 and the antenna element 72, and switches the connection state between the antenna elements 71 and 72 under the instruction of the connection state setting unit 76.
- connection switch 75 of the contactless terminal 1 is inserted in series between the antenna element 72 and the antenna element 73, and switches the connection state between the antenna elements 72 and 73 under the instruction of the connection state setting unit 76.
- connection switches 74 and 75 constitute connection state switching means.
- connection state setting unit 76 of the non-contact type terminal 1 operates using the power stored in the power storage unit 17 as a driving source, and connects a switching command instructing to switch the connection state between the antenna elements. Output to switches 74 and 75. Further, the power of each radio wave measured by the power measuring unit 18 is compared with each other, and the connection state between the antenna elements is set to the connection state when the radio wave power is maximum.
- the connection state setting means is set from the connection switches 74 and 75 and the connection state setting unit 76.
- the frequency excited by antenna element 61 is sequentially switched, and the frequency excited by antenna element 61 is set to the frequency at which the radio wave power is maximized.
- the connection state between the antenna elements is sequentially switched, the connection state between the antenna elements may be set to the connection state when the radio wave power becomes maximum.
- connection state setting unit 76 of the non-contact type terminal 1 controls the connection switches 74 and 75 so that the connection state between the antenna elements 71 and 72 is “connected”, for example. Set the connection status between to "connected”.
- the antenna elements 71 73 are connected in series to form one antenna element, for example, an antenna element that excites at the frequency fl.
- the detector 15 detects the radio wave.
- the power measurement unit 18 of the contactless terminal 1 measures the power of the detection radio wave detected by the detector 15 and stores the measurement result in the internal memory.
- connection state setting unit 76 of the non-contact terminal 1 controls the connection switches 74 and 75 so that, for example, the connection state between the antenna elements 71 and 72 is "connected", and the antenna elements 72 and 73 are connected. Set the connection state between to "not connected”.
- the antenna elements 71 and 72 are connected in series to form one antenna element, for example, an antenna element excited at the frequency f2.
- the detector 15 detects the radio wave.
- the power measurement unit 18 of the contactless terminal 1 measures the power of the detection radio wave detected by the detector 15 and stores the measurement result in the internal memory.
- connection state setting unit 76 of the contactless terminal 1 controls the connection switches 74 and 75 so that, for example, the connection state between the antenna elements 71 and 72 is "not connected”. Set the connection status between 73 to “not connected”.
- the antenna element 71 is connected to the detector 15 and becomes an antenna element excited at the frequency f 3, for example.
- the detector 15 Detect radio waves.
- the power measurement unit 18 of the contactless terminal 1 measures the power of the detection radio wave detected by the detector 15 and stores the measurement result in the internal memory.
- connection state setting unit 76 of the non-contact terminal 1 selects a frequency at which the power of the detection radio wave is maximized from the connection states between the three antenna elements.
- connection state setting unit 76 indicates that the connection state between the antenna elements where the power of the detection radio wave is maximum is “connected” between the antenna elements 71 and 72, and between the antenna elements 72 and 73.
- connection switches 74 and 75 are controlled to set the connection state between the antenna elements 71 and 72 to “connected” and the connection state between the antenna elements 72 and 73 to “not connected”.
- the antenna elements 71 and 72 are connected in series to form one antenna element, for example, an antenna element that excites at the frequency f 2.
- the transmission / reception processing unit 20 of the non-contact type terminal 1 transmits and receives radio waves to and from the reader / writer device 2 using an antenna element excited at the frequency f2.
- connection state between the antenna elements is sequentially switched, and the connection state between the antenna elements is set to the connection state when the radio wave power becomes maximum.
- the non-contact type terminal according to the present invention is suitable, for example, as an RF-ID tag that can be shelled on a product.
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- Artificial Intelligence (AREA)
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- General Physics & Mathematics (AREA)
- Theoretical Computer Science (AREA)
- Variable-Direction Aerials And Aerial Arrays (AREA)
- Near-Field Transmission Systems (AREA)
Abstract
Description
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Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
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PCT/JP2004/010414 WO2006008816A1 (ja) | 2004-07-22 | 2004-07-22 | 非接触型端末及びリーダライタ装置 |
JP2006527707A JPWO2006008816A1 (ja) | 2004-07-22 | 2004-07-22 | 非接触型端末及びリーダライタ装置 |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
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PCT/JP2004/010414 WO2006008816A1 (ja) | 2004-07-22 | 2004-07-22 | 非接触型端末及びリーダライタ装置 |
Publications (1)
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WO2006008816A1 true WO2006008816A1 (ja) | 2006-01-26 |
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Family Applications (1)
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PCT/JP2004/010414 WO2006008816A1 (ja) | 2004-07-22 | 2004-07-22 | 非接触型端末及びリーダライタ装置 |
Country Status (2)
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JP (1) | JPWO2006008816A1 (ja) |
WO (1) | WO2006008816A1 (ja) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
KR101388579B1 (ko) * | 2006-05-16 | 2014-04-23 | 아스크 에세.아. | 수개의 안테나 및 연관된 안테나 선택회로를 포함하는 비접촉 무선주파수 장치 |
Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH1051352A (ja) * | 1996-07-31 | 1998-02-20 | Mitsubishi Electric Corp | 非接触通信システム |
JPH10187916A (ja) * | 1996-12-27 | 1998-07-21 | Rohm Co Ltd | 非接触icカード通信システムにおける応答器 |
JPH1188246A (ja) * | 1997-09-08 | 1999-03-30 | Matsushita Electric Ind Co Ltd | アンテナ装置及びそれを用いた無線受信装置 |
JP2001057529A (ja) * | 1999-08-18 | 2001-02-27 | Mitsubishi Electric Corp | 無線装置 |
-
2004
- 2004-07-22 JP JP2006527707A patent/JPWO2006008816A1/ja not_active Withdrawn
- 2004-07-22 WO PCT/JP2004/010414 patent/WO2006008816A1/ja active Application Filing
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH1051352A (ja) * | 1996-07-31 | 1998-02-20 | Mitsubishi Electric Corp | 非接触通信システム |
JPH10187916A (ja) * | 1996-12-27 | 1998-07-21 | Rohm Co Ltd | 非接触icカード通信システムにおける応答器 |
JPH1188246A (ja) * | 1997-09-08 | 1999-03-30 | Matsushita Electric Ind Co Ltd | アンテナ装置及びそれを用いた無線受信装置 |
JP2001057529A (ja) * | 1999-08-18 | 2001-02-27 | Mitsubishi Electric Corp | 無線装置 |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
KR101388579B1 (ko) * | 2006-05-16 | 2014-04-23 | 아스크 에세.아. | 수개의 안테나 및 연관된 안테나 선택회로를 포함하는 비접촉 무선주파수 장치 |
Also Published As
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JPWO2006008816A1 (ja) | 2008-05-01 |
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