WO2006033408A1 - ループアンテナユニット及び無線通信媒体処理装置 - Google Patents
ループアンテナユニット及び無線通信媒体処理装置 Download PDFInfo
- Publication number
- WO2006033408A1 WO2006033408A1 PCT/JP2005/017516 JP2005017516W WO2006033408A1 WO 2006033408 A1 WO2006033408 A1 WO 2006033408A1 JP 2005017516 W JP2005017516 W JP 2005017516W WO 2006033408 A1 WO2006033408 A1 WO 2006033408A1
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- WIPO (PCT)
- Prior art keywords
- loop antenna
- antenna unit
- wireless communication
- unit according
- loop
- Prior art date
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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
- G06K19/00—Record carriers for use with machines and with at least a part designed to carry digital markings
- G06K19/06—Record carriers for use with machines and with at least a part designed to carry digital markings characterised by the kind of the digital marking, e.g. shape, nature, code
- G06K19/067—Record carriers with conductive marks, printed circuits or semiconductor circuit elements, e.g. credit or identity cards also with resonating or responding marks without active components
- G06K19/07—Record carriers with conductive marks, printed circuits or semiconductor circuit elements, e.g. credit or identity cards also with resonating or responding marks without active components with integrated circuit chips
- G06K19/077—Constructional details, e.g. mounting of circuits in the carrier
- G06K19/07749—Constructional details, e.g. mounting of circuits in the carrier the record carrier being capable of non-contact communication, e.g. constructional details of the antenna of a non-contact smart card
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06K—GRAPHICAL DATA READING; PRESENTATION OF DATA; RECORD CARRIERS; HANDLING RECORD CARRIERS
- G06K19/00—Record carriers for use with machines and with at least a part designed to carry digital markings
- G06K19/06—Record carriers for use with machines and with at least a part designed to carry digital markings characterised by the kind of the digital marking, e.g. shape, nature, code
- G06K19/067—Record carriers with conductive marks, printed circuits or semiconductor circuit elements, e.g. credit or identity cards also with resonating or responding marks without active components
- G06K19/07—Record carriers with conductive marks, printed circuits or semiconductor circuit elements, e.g. credit or identity cards also with resonating or responding marks without active components with integrated circuit chips
- G06K19/077—Constructional details, e.g. mounting of circuits in the carrier
- G06K19/07749—Constructional details, e.g. mounting of circuits in the carrier the record carrier being capable of non-contact communication, e.g. constructional details of the antenna of a non-contact smart card
- G06K19/07771—Constructional details, e.g. mounting of circuits in the carrier the record carrier being capable of non-contact communication, e.g. constructional details of the antenna of a non-contact smart card the record carrier comprising means for minimising adverse effects on the data communication capability of the record carrier, e.g. minimising Eddy currents induced in a proximate metal or otherwise electromagnetically interfering object
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q1/00—Details of, or arrangements associated with, antennas
- H01Q1/12—Supports; Mounting means
- H01Q1/22—Supports; Mounting means by structural association with other equipment or articles
- H01Q1/2208—Supports; Mounting means by structural association with other equipment or articles associated with components used in interrogation type services, i.e. in systems for information exchange between an interrogator/reader and a tag/transponder, e.g. in Radio Frequency Identification [RFID] systems
- H01Q1/2216—Supports; Mounting means by structural association with other equipment or articles associated with components used in interrogation type services, i.e. in systems for information exchange between an interrogator/reader and a tag/transponder, e.g. in Radio Frequency Identification [RFID] systems used in interrogator/reader equipment
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q1/00—Details of, or arrangements associated with, antennas
- H01Q1/12—Supports; Mounting means
- H01Q1/22—Supports; Mounting means by structural association with other equipment or articles
- H01Q1/2208—Supports; Mounting means by structural association with other equipment or articles associated with components used in interrogation type services, i.e. in systems for information exchange between an interrogator/reader and a tag/transponder, e.g. in Radio Frequency Identification [RFID] systems
- H01Q1/2225—Supports; Mounting means by structural association with other equipment or articles associated with components used in interrogation type services, i.e. in systems for information exchange between an interrogator/reader and a tag/transponder, e.g. in Radio Frequency Identification [RFID] systems used in active tags, i.e. provided with its own power source or in passive tags, i.e. deriving power from RF signal
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q1/00—Details of, or arrangements associated with, antennas
- H01Q1/48—Earthing means; Earth screens; Counterpoises
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q1/00—Details of, or arrangements associated with, antennas
- H01Q1/52—Means for reducing coupling between antennas; Means for reducing coupling between an antenna and another structure
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q19/00—Combinations of primary active antenna elements and units with secondary devices, e.g. with quasi-optical devices, for giving the antenna a desired directional characteristic
- H01Q19/10—Combinations of primary active antenna elements and units with secondary devices, e.g. with quasi-optical devices, for giving the antenna a desired directional characteristic using reflecting surfaces
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q21/00—Antenna arrays or systems
- H01Q21/06—Arrays of individually energised antenna units similarly polarised and spaced apart
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q21/00—Antenna arrays or systems
- H01Q21/06—Arrays of individually energised antenna units similarly polarised and spaced apart
- H01Q21/08—Arrays of individually energised antenna units similarly polarised and spaced apart the units being spaced along or adjacent to a rectilinear path
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q7/00—Loop antennas with a substantially uniform current distribution around the loop and having a directional radiation pattern in a plane perpendicular to the plane of the loop
Definitions
- the present invention supplies power and transmission data to a wireless communication medium such as a contactless IC card or IC tag attached to a product or a book stored in a commodity shelf, etc., and receives the reception data from the wireless communication medium. More particularly, the present invention relates to a loop antenna unit and a wireless communication medium processing apparatus that are suitably used for storage shelves, display shelves, and the like that are automatically acquired by load fluctuations and that can automatically manage merchandise and books.
- a wireless communication medium such as a contactless IC card or IC tag attached to a product or a book stored in a commodity shelf, etc.
- FIG. 19 shows a perspective view of an antenna unit according to the conventional technique described in (Patent Document 1).
- an antenna unit 101 having a configuration in which a loop antenna 111 provided on an antenna substrate 102 is connected via a driver 107 connected to an oscillator 108 and closed loop circuits 112 and 121 are arranged around the loop antenna 111 is provided. is there.
- the closed loop circuits 112 and 121 electromagnetically coupled by the magnetic flux 113 generated from the loop antenna 111 behave like the loop antenna 111.
- Patent Document 1 Japanese Patent Laid-Open No. 2001-85927
- the antenna unit 101 includes a loop antenna 111 and a closed loop circuit provided on the antenna substrate 102 as shown in FIG. (Resonance circuit) This is a configuration consisting only of 112 and 121.
- This antenna unit 101 is desired if it is installed in free space (no metal or other structure around the antenna is installed! When this is applied to storage shelves and display shelves for product management and book management, etc., it is made of wood, resin, or metal. There is a need to place the antenna unit 101 in close proximity to the structure.
- the antenna performance is remarkably deteriorated.
- the antenna impedance of the loop antenna 111 and the closed loop circuit (resonance circuit) 112 and 121 which are greatly affected in the case of a metal structure, fluctuates greatly due to the influence of the metal structure, resulting in fluctuations in the resonance frequency.
- the reader / writer Z writer device could not be matched with the input / output impedance, and it became necessary to adjust each time.
- the normal loop antenna 11 that is, the balanced loop antenna force, especially when close to a metal structure, the antenna has a high frequency close to short (short-circuited) characteristic, and the antenna impedance approaches zero and deviates from the adjustment range. Then, impedance matching on the subsequent circuit side cannot be achieved. Sufficient power cannot be supplied from the antenna unit 101 to the IC card. As a result, there was a fatal problem that the communication distance would become extremely short, communication could not be performed, and in the worst case, the transmission circuit of the reader Z writer device would be broken.
- the closed loop circuit (resonance circuit) is described as a closed loop circuit configured by connecting a coil and a capacitor.
- it is a parallel resonant circuit (closed circuit) itself that also has a coil and capacitor force, and the impedance of the parallel resonant circuit is usually high with a high impedance of several hundreds to several ⁇ .
- the closed-loop circuit (resonance circuit) is high-impedance, the value of the current flowing through the closed-loop circuit is small.
- a matching load is not connected to this circuit, a standing wave is generated due to mismatching, which makes operation unstable and causes mismatching loss, further reducing the current and re-radiating the closed-loop circuit force.
- the density of the generated magnetic flux is smaller, and the overall efficiency of the antenna unit is very low.
- the present invention solves the above-described problems, greatly reduces the influence of structures such as metal around the installation location, satisfies stable reading and writing characteristics, and simplifies the communication range. This is related to the non-contact IC card reading / writing section that has excellent expandability and convenience.
- a first invention according to the present invention is a loop antenna unit composed of a plurality of loop antennas, and includes a first loop antenna to be fed and a second loop that surrounds the first loop antenna and is not fed.
- a loop antenna unit is a loop antenna unit. According to this configuration, when the parasitic loop antenna is installed adjacent to the loop antenna unit and only the first loop antenna is fed, the first loop antenna, the parasitic loop antenna, While the loop antenna of 2 functions as a buffer, it can be electromagnetically coupled by mutual induction. This makes even a parasitic loop antenna Even when multiple antennas are added, fluctuations in the resonance frequency of the first loop antenna can be suppressed, so adjustment of impedance matching of the loop antenna unit can be eliminated.
- a second invention according to the present invention is the loop antenna unit according to the first invention, further comprising a grounded metal member, wherein the first loop antenna and the second loop antenna are provided.
- a loop antenna unit connected to a metal member According to this configuration, the influence on the antenna characteristics due to the structure (such as metal, wooden, and resin) existing near the installation location of the loop antenna unit and unnecessary noise from the surrounding area is reduced. Since it can be reduced, fluctuations in the reference potential (ground potential) can be reduced.
- a third invention according to the present invention is the loop antenna unit according to the second invention, and further connects the first loop antenna and the second loop antenna to a metal member.
- a loop antenna unit having a single ground line According to this configuration, it is possible to reduce the number of parts of the loop antenna unit while reducing the fluctuation of the reference potential (ground potential).
- a fourth invention according to the present invention is any one of the second to third loop antenna units described above, and further includes a first loop antenna, a second loop antenna, a metal member, It is a loop antenna unit which has a magnetic member arranged between.
- a first loop antenna when the inner loop antenna is fed, most of the generated magnetic flux can be prevented from passing through the metal member by passing it through the magnetic member, and eddy currents caused by the passage of magnetic flux can be prevented.
- the metal member can be prevented from being generated.
- the magnetic field strength can be improved by reducing the loss of the magnetic field while being influenced by the surrounding metal.
- a fifth invention according to the present invention is any one of the first to fourth loop antenna units, further comprising a resonance circuit and a matching circuit connected to the first loop antenna.
- a loop antenna unit having a first circuit unit including the second circuit unit including a resonance circuit, a matching circuit, and a matching load connected to the second loop antenna.
- a sixth invention according to the present invention is connected to the first loop antenna unit of the first to fifth loop antenna units and the first loop antenna included in the loop antenna unit, and is stored in a wireless communication medium.
- Wireless communication in which a signal current from the read / write unit is fed only to the first loop antenna.
- a media processing device According to this configuration, it is possible to provide a loop antenna unit that can suppress fluctuations in the resonance frequency.
- a seventh invention according to the present invention is the sixth radio communication medium processing apparatus according to the sixth aspect, further comprising a third loop antenna that is not supplied with power, and the third loop antenna includes the first to fifth antennas.
- a wireless communication medium processing device arranged adjacent to any one of the loop antenna units. According to this configuration, it is possible to extend the communication range without requiring adjustment of impedance matching of the loop antenna unit.
- An eighth invention according to the present invention is a loop antenna having a loop antenna that communicates with a wireless communication medium and has a pair of open ends at both ends, and a metal member that is disposed in proximity to the loop antenna.
- a loop antenna unit characterized in that the metal member is electrically connected to one of the open ends of the loop antenna with an interval of approximately 1Z200 to 1Z4000 of the wavelength of the communication frequency, The impedance of the antenna can be adjusted with a metal member, the antenna's reference potential (ground potential) can be stabilized, and the influence on the antenna characteristics due to metal around the installation location can be greatly reduced. Is.
- a loop antenna supplies power and transmission data to a wireless communication medium by electromagnetic induction, and acquires received data from the wireless communication medium by load fluctuation.
- the reference potential is stabilized and communication with the wireless communication medium can be realized.
- a tenth aspect of the present invention is the loop according to any one of the eighth to ninth aspects, wherein the metal member is arranged substantially parallel to the main surface of the loop antenna! This is an antenna unit that can further reduce the influence on the antenna characteristics.
- An eleventh aspect of the present invention is the loop antenna according to any one of the eighth to tenth aspects, wherein a magnetic member is disposed between the loop antenna and the metal member. -It can improve the magnetic field strength and make the loop antenna thinner.
- a twelfth aspect of the present invention is the loop antenna unit according to the eleventh aspect described above, wherein the magnetic member is disposed substantially parallel to the main surface of the loop antenna. Strength improvement can be further strengthened.
- a fifteenth aspect of the present invention is the loop antenna unit according to any one of the eleventh to fourteenth aspects, characterized in that the magnetic member is a magnetic member having flexibility. It is possible to improve the shot performance and durability.
- one of the pair of open ends is electrically connected to the metal member and connected to the ground terminal of the unbalanced resonance circuit and the matching circuit.
- the loop antenna unit according to any one of the eighth to fifteenth aspects, wherein the other of the pair of open ends is connected to a signal terminal of an unbalanced resonance circuit and a matching circuit. It is possible to greatly reduce fluctuations in the reference potential (ground potential), and to provide a loop antenna unit with stable performance that is resistant to unwanted noise from the surroundings. Is.
- one of the pair of open ends is connected to a ground terminal of a read / write unit that reads or writes data or reads / writes data with a wireless communication medium, and the pair of open ends.
- the loop antenna unit according to any one of the eighth to fifteenth aspects, wherein the other end is connected to a signal terminal of the read / write unit, and the reference potential (ground potential) of the read / write unit is varied. It is possible to provide a loop antenna unit that can be significantly reduced in size and has stable performance that is resistant to unnecessary noise from peripheral forces.
- the loop antenna unit in the loop antenna unit, the loop antenna, the magnetic member, and the metal member, and the first isolation member disposed between the loop antenna and the magnetic member, and the magnetic member
- the loop antenna unit according to any one of the eighth to the seventeenth forces 1, wherein a second isolation member disposed between the first and second metal members is formed in a stacked manner.
- a thin feed loop antenna unit is provided.
- the loop antenna is formed from a pattern conductor formed on an electronic substrate, and the electronic substrate is stacked as a loop antenna.
- An antenna unit which is a small and thin feed loop antenna unit, is provided.
- a twentieth aspect of the present invention is the loop antenna unit according to the nineteenth aspect described above, wherein a resonance circuit and a matching circuit are formed on an electronic substrate, wherein the loop antenna unit is reduced in size and thickness.
- a feed loop antenna unit is provided.
- a twenty-first aspect of the present invention is the loop antenna unit according to the eighteenth aspect described above, characterized in that the loop antenna unit is stored in a storage case, wherein the feeding loop is reduced in size and thickness. An antenna unit is provided.
- a twenty-second invention according to the present invention is a loop antenna unit characterized in that the loop antenna unit according to any one of the eighth to seventeenth aspects is housed in a housing, and is easy to use for general purposes.
- the loop antenna unit can be used.
- the plurality of loop antenna units are arranged in a straight line, a radial pattern, or an array in substantially the same plane.
- the plurality of loop antenna units include a feed loop antenna unit to which a signal current is supplied and a parasitic loop antenna unit to which the signal current is not supplied.
- the loop antenna unit described in the above item 23 characterized in that misrecognition due to a phase shift for each loop antenna is prevented, and the communication range can be expanded while reducing power consumption.
- a twenty-fifth aspect of the present invention includes a plurality of loop antenna units according to any one of the eighth to twenty-fourth aspects, and a read / write unit that reads, writes, or reads / writes data with a wireless communication medium.
- a plurality of loop antenna units including a feed loop antenna unit to which a signal current is fed and a parasitic loop antenna unit to which a signal current is not fed
- the medium processing apparatus can prevent misrecognition due to a phase shift for each loop antenna, and can extend the communication range while reducing power consumption.
- a twenty-sixth aspect of the present invention is the wireless communication medium processing device according to the twenty-fifth aspect, wherein the read / write unit is connected only to the feeding loop antenna unit among the plurality of loop antenna units. Therefore, the power consumption is reduced and the overall size of the apparatus is reduced.
- the parasitic loop antenna when the parasitic loop antenna is installed adjacent to the loop antenna unit and only the first loop antenna is fed, the first loop antenna, the parasitic loop antenna, Force While the second loop antenna functions as a buffer, it can be electromagnetically coupled by mutual induction. As a result, even when a plurality of parasitic loop antennas are added, fluctuations in the resonance frequency of the first loop antenna can be suppressed, so adjustment of impedance matching of the loop antenna unit is not required. I can do it.
- the loop antenna unit is a grounded loop antenna unit having a metal member, one end of the two open ends of the loop antenna is electrically connected to the metal member.
- the parasitic loop antenna unit has a configuration in which the loop antenna is connected to a matching load via a resonance circuit and a matching circuit, and therefore, it is possible to suppress the occurrence of standing waves and mismatch loss due to reflected waves.
- the density of the re-radiated magnetic flux becomes higher and the overall efficiency of the loop antenna unit is very high and stable characteristics can be obtained, so that the total communication range can be greatly expanded. .
- the parasitic loop antenna unit is parasitic, it does not cause excessive power consumption, and does not affect other electronic devices, thereby saving power.
- the feeding loop antenna unit and the parasitic loop antenna unit are stored in the case in a laminated structure, making the equipment thinner and smaller, making it easier to carry and install, and providing durability and weather resistance. It can be installed simply by putting it up. This is especially effective when the communication range is to be changed, and the expansion of the communication range can be optimized.
- the feeding loop antenna unit and the parasitic loop antenna unit are stored. Since the case is a thin case, it can be easily installed on product shelves, etc., and wireless communication media built into products and books can communicate with external read / write units.
- FIG. 1 is a perspective view of a first loop antenna unit according to Embodiment 1 of the present invention
- FIG. 1B is a cross-sectional view of the first loop antenna unit according to Embodiment 1 of the present invention.
- FIG. 3 is a perspective view of a first feeding loop antenna unit according to Embodiment 1 of the present invention.
- FIG. 4 is a perspective view of a first parasitic loop antenna unit according to Embodiment 1 of the present invention.
- FIG. 5 is a perspective view showing a first usage example in the first embodiment of the present invention.
- FIG. 6 is a perspective view of a second feeding loop antenna unit according to Embodiment 1 of the present invention.
- FIG. 7 is a perspective view of a second parasitic loop antenna unit according to the first embodiment of the present invention.
- FIG. 8 is a perspective view showing a second usage example in the first embodiment of the present invention.
- FIG. 9 (a) is a perspective view of the wireless communication medium device according to the first embodiment of the present invention, and (b) is a cross-sectional view of the wireless communication medium device according to the first embodiment of the present invention.
- FIG. 10 (a) Exploded view of loop antenna unit in embodiment 1 of the present invention, (b) Side sectional view of loop antenna unit in embodiment 1 of the present invention.
- FIG. 11 is a perspective view of a usage example of the wireless communication medium processing device according to the second embodiment of the present invention.
- FIG. 12 is a perspective view of a second usage example of the wireless communication medium processing device according to the second embodiment of the present invention.
- FIG. 13 (a) is a perspective view of a loop antenna unit according to Embodiment 3 of the present invention, and (b) is a side view of the loop antenna unit according to Embodiment 3 of the present invention.
- FIG. 14 (a) is a perspective view showing a loop antenna unit according to Embodiment 4 of the present invention;
- FIG. 15 is a perspective view showing a loop antenna unit according to the fifth embodiment of the present invention.
- FIG. 16 is a perspective view showing a loop antenna unit according to the sixth embodiment of the present invention.
- FIG. 17 is a perspective view showing a wireless communication medium device according to a seventh embodiment of the present invention.
- FIG. 18 is a perspective view showing an example of use of the wireless communication medium processing device according to the eighth embodiment of the present invention.
- FIG. 19 is a perspective view of an antenna unit in the prior art.
- the wireless communication medium in the present invention is a medium that can communicate with a processing device in a non-contact manner, such as a non-contact IC card, an IC tag, an ID tag, an identification label, and an RF-ID tag.
- the processing device is a device that communicates with these wireless communication media, a so-called reader, A reader / writer.
- FIG. 1 (a) is a perspective view of a first loop antenna unit according to Embodiment 1 of the present invention
- FIG. 1 (b) is a cross-sectional view of the first loop antenna unit according to Embodiment 1 of the present invention.
- 1 is a loop antenna
- 2 is a metal member.
- 3 is one end of the open end of the loop antenna
- 4 is the other end of the open end of the loop antenna
- 5 is a conductive wire, plate or bar, near the open end of the loop antenna 1
- metal parts are electrically grounded.
- the loop antenna 1 and the metal member 2 are arranged substantially in parallel with a desired interval tl.
- the loop antenna 1 may be any of a circular shape, a substantially rectangular shape, or a polygonal shape as long as it has a loop shape with an opening at the center.
- a conductive metal wire, metal plate, metal foil, metal cylinder, or the like can be appropriately selected.
- the loop length of the loop antenna 1 is preferably approximately 1Z10 to 1Z100 of the wavelength of the communication frequency (220 to 2200 mm when the communication frequency is 13.56 MHz).
- the loop antenna 1 and the metal member 2 are preferably substantially parallel, but may not be substantially parallel! /.
- FIG. 2 (a) is a perspective view of the second loop antenna unit in the first embodiment of the present invention
- FIG. 2 (b) is a cross-sectional view of the second loop antenna unit in the first embodiment of the present invention. It is.
- 6 is a magnetic member, and the magnetic member 6 is disposed at a position t2 from the back surface of the loop antenna 1 and a front surface force t3 of the metal member 2, and is made of a sheet-like or plate-like material.
- a magnetic material is used.
- the sheet-like or plate-like magnetic body a ferrite core or the like can be used.
- it is lightweight to use a magnetic sheet in which a soft magnetic powder is mixed in an organic binder such as a resin material. This is preferable because wrinkles can be achieved.
- an organic solvent or the like is mixed with ferrite-based powder, flexibility can be ensured, and impact resistance and durability can be improved.
- the shape of the magnetic member 6 may be arranged on the entire surface including the region corresponding to the opening of the loop antenna 1, but by matching the shape of the loop antenna 1 with a loop shape (doughnut shape) Of magnetic material The amount used can be reduced. This is particularly preferable when using an expensive magnetic sheet.
- the metal member 2 can be a metal flat plate. The metal member 2 is preferably larger than the loop antenna 1.
- the metal member 2 is approximately 1.1 times larger than the loop antenna 1 (area: W1
- the antenna impedance does not change and the resonance frequency does not shift, and adjustment of the resonance frequency becomes unnecessary. Therefore, if the size of the metal member 2 is at least about 1.1 times the size of the loop antenna 1, the size can be minimized while maintaining these performances, and the device can be miniaturized. be able to.
- FIG. 3 is a perspective view of the first feeding loop antenna unit according to Embodiment 1 of the present invention.
- a resonance circuit 8 and a matching circuit 9 are provided on a printed circuit board 7.
- the ground terminal side of conductive wire, plate, or bar 5 is connected to the ground side of resonance circuit 8 and matching circuit 9, and the other end of the open end of loop antenna 1 4 is a feed loop antenna unit connected to the signal side of the resonance circuit 8 and the matching circuit 9.
- it is connected to the transmission / reception circuit of the read / write unit 12 via a transmission line such as the coaxial cable 11.
- FIG. 4 is a perspective view of the first parasitic loop antenna unit according to Embodiment 1 of the present invention.
- a resonant circuit 8, a matching circuit 9, and a matching load 10 are provided on a printed circuit board 7.
- the ground terminal side of the conductive wire, plate, or bar 5 is connected to the ground side of the resonance circuit 8 and the matching circuit 9, and then connected to one end of the matching load 10.
- the other end of the two open ends of the loop antenna 1 is connected to the signal side of the resonance circuit 8 and the matching circuit 9, and then connected to the other end of the matching load 10, thereby It is difficult to be affected by the antenna characteristics due to the surrounding metal, etc., and by suppressing the occurrence of standing waves due to mismatching, stable loss of operation is reduced. This makes it possible to ensure stable performance with high efficiency of re-radiating electromagnetic fields by electromagnetic induction.
- the loop antenna 1 is less susceptible to the influence of the metal member 2, so the distance from the metal member 2 (the distance corresponding to tl shown in Fig. 1 (b)) can be reduced. .
- the distance between the loop antenna 1 and the metal member 2 is a value of approximately 1Z200 to 1Z4000 of the wavelength of the communication frequency in order to reduce the size of the wireless communication medium device described later while suppressing a decrease in the communication distance. (When the communication frequency is 13.56 MHz, 5.5-: L 10 mm) is preferable.
- the interval when the interval is 5.5 mm or less, the amount of eddy current generated in the metal member 2 increases, and as a result, the loss of the magnetic field increases, and the communication distance becomes extremely short.
- the interval is 110 mm or more, the casing (not shown) that accommodates the loop antenna 1 and the metal member 2 becomes large, and the size of the wireless communication medium device increases.
- FIG. 5 is a perspective view showing a first usage example in the first embodiment of the present invention.
- 13 is the first feeding loop antenna unit shown in FIG. 3
- 14 is the first non-feeding loop antenna unit shown in FIG.
- FIG. 6 is a perspective view of the second feeding loop antenna unit according to Embodiment 1 of the present invention.
- FIG. 7 is a perspective view of the second parasitic loop antenna unit according to Embodiment 1 of the present invention.
- FIG. 8 is a perspective view showing a second usage example in the first embodiment of the present invention.
- reference numeral 6 denotes a magnetic member, which is effective in reducing the thickness of the loop antenna unit.
- Embodiment 1 of the present invention will be described in detail including the flow of high-frequency current and the flow of magnetic flux.
- FIG. 9 (a) is a perspective view of the wireless communication medium device according to Embodiment 1 of the present invention.
- (b) is a cross-sectional view of the wireless communication medium device according to Embodiment 1 of the present invention.
- FIG. 9 (a) shows a case where two parasitic loop antenna units 14 are linearly arranged on both sides of the feed loop antenna unit 13.
- read / write unit 12 The high-frequency transmission power and transmission signal output from the transmission circuit are supplied to the matching circuit 9 of the feeding loop antenna unit 13 via the coaxial cable 11 and then guided to the loop antenna 1 via the resonance circuit 8.
- the impedance of the transmission circuit of the read / write unit 12 and the coaxial cable 11 and the impedance of the resonance circuit 8 are sufficiently matched, so that the generation of standing waves is suppressed and the antenna is efficiently fed.
- the magnetic fluxes HI and H2 generated by the high-frequency current il flowing in the loop antenna 1 of the feed loop antenna unit 13 pass through the opening surface of the loop antenna 1 of the adjacent feed loop antenna unit 14 respectively.
- High-frequency currents i2 and i4 flow through the loop antenna 1 of the antenna unit 14, respectively.
- a magnetic flux H3 is generated by the high-frequency current i2
- a magnetic flux H5 is generated by the high-frequency current i4.
- high frequency current i3 is generated by magnetic flux H3, and high frequency current i5 is generated by magnetic flux H5.
- the high frequency current i3 generates a magnetic flux H4, and the high frequency current i5 generates a magnetic flux H6.
- the loop antenna 1 of the parasitic loop antenna unit 14 is provided with the resonant circuit 8, the matching circuit 9, and the matching load 10 to reduce the presence of reflected waves by suppressing the occurrence of standing waves due to mismatching.
- High-frequency current flows through the loop antenna 1 efficiently, and the re-radiation of magnetic flux continues and contributes greatly to the expansion of the communication range.
- FIG. 10 (a) is an exploded view of the loop antenna unit according to the first embodiment of the present invention
- FIG. 10 (b) is a side sectional view of the loop antenna unit according to the first embodiment of the present invention.
- the loop antenna (especially when it is formed on an electronic substrate further promotes thinning) 1, the magnetic member 6, and the metal member 2 are the loop antenna 1 and the metal.
- the spacer as the first isolation member between the member 2 and the spacer as the second isolation member between the loop antenna 1 and the magnetic member 6, a very thin loop antenna is stacked. A unit can be realized.
- the matching circuit 9 and the resonance circuit 8 are also formed on the same electronic substrate, so that further reduction in thickness can be realized. It is a monkey.
- the configuration in which the resonance circuit 8 and the matching circuit 9 are provided on the electronic substrate makes it possible to provide In the antenna unit 14, the unbalanced resonance circuit 8, the matching circuit 9 and the matching load 10 are provided on the electronic substrate, thereby reducing the size, the thickness, and the price.
- a common grease housing can be used for both the feeding loop antenna unit 13 and the parasitic feeding loop antenna unit 14, and the cost can be reduced.
- the loop antenna first isolation member, magnetic member 6, second isolation member, and metal member 2 created on the electronic substrate are connected to the resin casing (main body) and the resin casing (back).
- the ease of assembly during manufacture increases, and the variation in performance due to the improved positioning and assembly dimensional accuracy of each element can be reduced.
- FIG. 11 is a perspective view of an example of use of the wireless communication medium processing apparatus according to Embodiment 2 of the present invention
- FIG. 12 is a perspective view of a second example of use of the wireless communication medium processing apparatus according to Embodiment 2 of the present invention. .
- FIG. 11 shows a first usage example thereof.
- a product or a book 18 with an IC tag 19 attached is placed on a wooden, resin or metal product shelf 17.
- a feeding loop antenna unit 15 and a parasitic loop antenna unit 16 are arranged in a 1-to-N (N ⁇ 1) relationship between the product shelf 17 and the product or book 18.
- the feed loop antenna unit 15 is arranged near the center, and in the lower shelf in the figure, the feed loop antenna unit 15 is arranged on the side.
- it is a wireless communication medium device having a stable characteristic that is excellent in convenience of non-adjustment simply by being placed on a metal merchandise shelf 17 and has excellent communication range expandability.
- FIG. 12 shows a second usage example.
- Fig. 12 (a) shows an example in which parasitic loop antenna units are arranged vertically on both sides
- Fig. 12 (b) shows an example in which parasitic loop antenna units are arranged vertically on the back. It can be easily expanded not only to a flat shape but also to a three-dimensional shape.
- FIG. 13 (a) is a perspective view of a loop antenna unit according to Embodiment 3 of the present invention
- FIG. 13 (b) is a side view of the loop antenna unit according to Embodiment 3 of the present invention.
- the loop antenna unit 21 has an inner loop antenna 21a (first 1 loop antenna) and outer loop antenna 21b (second loop antenna).
- the outer loop antenna 21b goes around the outer periphery of the inner loop antenna 21a.
- the inner loop antenna 21a and the outer loop antenna 21b are arranged on the same plane as shown in Fig. 13 (a), as long as the outer loop antenna 21b surrounds the inner loop antenna 21a. However, they are not necessarily arranged on the same plane.
- the inner loop antenna 21a and the outer loop antenna 21b are magnetically coupled, it is possible to arrange them on different planes.
- the loop antenna unit 21 includes a folded portion 21c, a metal member 2, and a grounding line 25, as shown in FIG. 13 (a).
- One terminal of the inner loop antenna 21a and one terminal of the outer loop antenna 21b are connected via a folded portion 21c.
- the folded portion 21c is made of a conductive material, and the shape thereof may be any of a linear shape, a plate shape, and a rod shape.
- the folded portion 21c is connected to the metal member 2 via the ground line 25.
- the grounding line 25 is made of a conductive material, similar to the folded portion 21c, and may have any shape such as a linear shape, a plate shape, or a rod shape.
- the metal member 2 is a rectangular plate material. As shown in FIG. 13B, the inner loop antenna 2 la and the outer loop antenna 21b and the metal member 2 are arranged substantially in parallel with a desired distance tl.
- the inner loop antenna 21a and the outer loop antenna 21b constituting the loop antenna unit 21 a loop shape having an opening at the center may be used. Any of a square shape may be sufficient.
- the material of the inner loop antenna 21a and the outer loop antenna 21b can be appropriately selected from conductive metal wire material, metal plate material, metal foil material, metal cylinder material, and the like.
- the loop length of the inner loop antenna 21a and the outer loop antenna 21b of the loop antenna unit 21 is approximately 1Z10 to 1Z100 (220 to 2200mm if 13.56MHz) of the wavelength of the communication frequency (for example, 13.56MHz). Preferably there is.
- the relationship between the lengths of the loop antennas 21a and 21b is the relationship between the inner loop antenna 21a and the outer loop antenna 21b! /.
- the inner loop antenna 21a has two terminals 23a and 24a. Between the two terminals 23a and 24a, a resonance circuit and a matching circuit (described later) (not shown) are provided. Specifically, the terminal 23a is connected to the ground side of the resonance circuit and the matching circuit, and the terminal 24a is connected to the signal side of the resonance circuit and the matching circuit.
- the resonance circuit and matching circuit read and write information stored in wireless communication media such as RF ID (RADIO FREQUENCY IDENTIFICATION) and electronic tags via a transmission line (not shown) such as a coaxial cable (described later). It is connected to a read / write unit (not shown) that performs at least one of the processes.
- wireless communication media such as RF ID (RADIO FREQUENCY IDENTIFICATION) and electronic tags via a transmission line (not shown) such as a coaxial cable (described later). It is connected to a read / write unit (not shown) that performs at least one of the processes.
- the antenna characteristics due to unnecessary noise from the structure (such as metal, wooden, and oil production capacity) existing in the vicinity of the installation location of the loop antenna unit and surroundings are also provided. Since the influence can be reduced, fluctuations in the reference potential (ground potential) of the read / write unit can be reduced.
- the outer loop antenna 21b has two terminals 23b and 24b, similarly to the inner loop antenna 21a.
- a resonance circuit, a matching circuit, and a matching load (not shown) are provided between the two terminals 23b and 24b.
- the terminal 23b is connected to the ground side of the resonance circuit and the matching circuit and one end of the matching load.
- Terminal 24b is connected to the signal side of the resonance circuit and the matching circuit, and to the other end of the matching load.
- a parasitic loop antenna (third loop antenna), which will be described later, is installed adjacent to the loop antenna unit 21 and is not connected to the inner loop antenna 21a.
- the inner loop antenna 21a, the parasitic loop antenna, and the force outer loop antenna 21b function as a buffer and can be electromagnetically coupled by mutual induction.
- fluctuations in the resonance frequency of the first loop antenna can be suppressed.
- the impedance matching adjustment of the loop antenna unit 21 can be made unnecessary while the communication range can be easily expanded.
- the loop antenna unit 21 has a folded loop antenna structure, which makes it possible to perform punching and other processes, increases the ease of manufacturing and assembly, and improves performance by assembling each element to improve dimensional accuracy. Can be reduced.
- the folded part 21c and the ground wire Needless to say, there is no change in the electrical characteristics even if the area around the center of path 25 is divided into two parts to form two independent grounding loops.
- the outer loop antenna 21b is not limited to the inner loop antenna 21a as long as the inner loop antenna 21a has a loop shape having an opening in the center and a pair of open ends. Any of these may be used. Further, the material of the inner loop antenna 21a and the outer loop antenna 2 lb can be appropriately selected from conductive metal wire material, metal plate material, metal foil material, metal cylinder material and the like.
- FIG. 14 (a) is a perspective view showing a loop antenna unit according to Embodiment 4 of the present invention
- FIG. 14 (b) is a side view thereof.
- the same elements as those of the fourth embodiment are denoted by the same reference numerals, and the description thereof is omitted.
- the loop antenna unit 21 of FIG. 14 is configured by two independent grounded loops, and is configured in a rectangular shape with an inner loop antenna 21a and an outer loop antenna 21b. ing. Each of the inner loop antenna 21a and the outer loop antenna 21b is provided with a ground line 25, which is a conductive wire rod or bar.
- a member for supporting a magnetic member 6 described later is omitted.
- the ground-side terminals 24a and 24b are electrically connected to the metal member 2, thereby achieving antenna characteristics due to metal around the installation location.
- the inner loop antenna 21a and the outer loop antenna 21b and the metal member 2 are arranged substantially in parallel with a desired interval therebetween.
- the inner loop antenna 2 la and the outer loop antenna 21b and the metal member 2 are preferably substantially parallel, but may not necessarily be substantially parallel.
- the metal member 2 can be a metal flat plate and is preferably larger than the outer loop antenna 21b.
- the loop antenna unit 21 has a magnetic member 6 as shown in FIG.
- the magnetic member 6 is disposed between the inner loop antenna 21 a and the outer loop antenna 21 b and the metal member 2. In this way, when feeding the inner loop antenna 21a, By passing most of the generated magnetic flux through the magnetic member 6, it can be prevented from passing through the metal member 2, and eddy current due to the passage of magnetic flux can be prevented from being generated in the metal member 2. As a result, the magnetic field strength can be improved by reducing the loss of the magnetic field while being hardly affected by the surrounding metal.
- FIG. 15 is a perspective view showing a loop antenna unit according to the fifth embodiment of the present invention.
- the loop antenna unit 21 has a common line 21c that connects the terminals 24a and 24b on the ground side.
- the common line 21c is connected to the metal member 2 through a single ground line 25.
- the ground loop 25 can be shared by the inner loop antenna 21a and the outer loop antenna 21b.
- the loop antenna unit 21 is resistant to unnecessary noise from the surroundings and can have stable performance.
- FIG. 16 is a perspective view showing a loop antenna unit according to the sixth embodiment of the present invention.
- the same elements as those in the third to fifth embodiments are denoted by the same reference numerals, and the description thereof is omitted.
- the loop antenna unit 21 of FIG. 16 has a configuration in which a resonance circuit, a matching circuit, and a matching load are connected to the loop antenna unit of the fourth embodiment.
- the inner loop antenna 21a has a first circuit unit 30 as shown in FIG.
- the first circuit unit 30 has a circuit board 7, and a resonance circuit 8 and a matching circuit 9 are mounted on the circuit board 7.
- the matching circuit 9 is a circuit for matching, for example, a parallel circuit of a capacitor and a resistor.
- the ground side of the resonance circuit 8 and the matching circuit 9 is connected to the ground line 25 and the terminal 24a.
- the signal sides of the resonance circuit 8 and the matching circuit 9 are connected to the terminal 23a.
- the outer loop antenna 21b has a second circuit unit 31 as shown in FIG.
- the second circuit unit 31 has a circuit board 22.
- the resonant circuit 8 and the matching circuit 9 are mounted on the circuit board 22.
- Resonant circuit 8 and The ground side of the matching circuit 9 is connected to the ground line 25 and the terminal 24b.
- the signal side of the resonance circuit 8 and the matching circuit 9 is connected to the terminal 23b.
- the circuit board 22 is mounted with a matching load 10 that is composed only of the resonance circuit 8 and the matching circuit 9.
- the matching load 10 is a resistor such as a chip resistor element.
- the resistance value of the matching load 10 is set to a predetermined value (for example, on the order of k ⁇ ) that can be matched in advance so that the resonance frequency of the inner loop antenna 21a on the power supply side does not fluctuate with the communication frequency (for example, 13.56 MHz). Value).
- the resonance frequency can be prevented from fluctuating in the communication frequency (eg, 13.56 MHz). Therefore, it is not necessary to adjust impedance matching. As a result, it is possible to suppress the occurrence of standing waves due to mismatching, and it is possible to stably operate an antenna with low loss with stable operation, and as a result, the electromagnetic field is re-radiated by electromagnetic induction. It is possible to ensure stable performance with high efficiency.
- Embodiment 6 differs from Embodiments 4 and 5 in that it describes the configuration in which no magnetic member is provided between loop antennas 21a and 21b and metal member 2.
- FIG. 17 is a perspective view showing a wireless communication medium device according to Embodiment 7 of the present invention.
- the radio communication medium processing device 40 includes a loop antenna unit 21 and a read / write unit 12 as shown in FIG.
- the circuit units 30 and 31 shown in the sixth embodiment are connected to the loop antenna unit 21 (see FIG. 15) shown in the fifth embodiment.
- the signal sides of the resonance circuit 8 and the matching circuit 9 mounted on the circuit board 7 are connected to a transmission / reception circuit (not shown) of the read / write unit 12 via a transmission line 11 such as a coaxial cable.
- the read / write unit 12 performs at least one of reading and writing of information stored in a wireless communication medium such as an RF-ID or an electronic tag.
- FIG. 18 shows a usage example of the wireless communication medium processing apparatus in the eighth embodiment of the present invention. It is a perspective view.
- the wireless communication medium processing device 41 includes a loop antenna unit 21 and a parasitic loop antenna (third loop antenna) 14 that is not fed.
- Two parasitic loop antennas 14 are provided and arranged adjacent to both sides of the loop antenna unit 21.
- the parasitic loop antenna 14 has the same configuration as that of the outer loop antenna 21b shown in FIG. 16, and a description thereof will be omitted.
- two parasitic loop antennas 14 are provided, but one may be provided, or a plurality of parasitic loop antennas 14 are arranged on the left and right of the loop antenna unit 21, respectively. May be.
- the plurality of parasitic loop antennas 14 may be arranged linearly as shown in FIG. 18, or may be arranged concentrically. Further, in FIG. 18, the parasitic loop antennas 14 can be arranged in a three-dimensional manner if the parasitic loop antennas 14 are arranged in a plane and adjacent parasitic loop antennas 14 are arranged close to each other. Noh.
- the inner loop antenna 21a and the parasitic loop antenna 14 can be electromagnetically coupled by mutual induction while the outer loop antenna 21b functions as a buffer.
- the impedance matching adjustment of unit 21 can be made unnecessary. Therefore, even when a plurality of parasitic loop antennas 14 are added, the adjustment of impedance matching of the loop antenna unit is not required, so the communication range can be easily expanded.
- the parasitic loop antenna unit 14 is parasitic, it does not cause excessive power consumption, and while saving power, it does not affect other electronic devices. I can do it.
- the loop antenna unit and parasitic loop antenna are stacked in a case and stored in the case, making the device thinner and smaller, making it easier to carry and install, and to further improve durability and weather resistance. Can be installed simply by placing it. This is especially effective when you want to change the communication range and can optimize the expansion of the communication range.
- Case power for storing the loop antenna unit and the parasitic loop antenna The thin case allows easy installation on a product shelf and the like, and a wireless communication medium embedded in a product or book, Communication with an external read / write unit becomes possible. With these, for example, inventory management of distribution warehouses and dealers, merchandise management of display shelves such as supermarkets and stationery stores, and document management of public offices, offices, etc. can be performed. It becomes possible to apply.
- the communication frequency does not need to be 13.56 MHz, and any frequency other than 13.56 MHz may be used in the HF band (3-30 MHz).
- the present invention provides a wireless communication medium that supplies power and transmission data to a wireless communication medium such as a non-contact IC card or an IC tag stored in a product shelf and acquires received data from the wireless communication medium due to load fluctuations. It is a processing device, and it is necessary to expand the communication range especially for storage shelves that can automatically manage products, books, etc., medicine management other than display shelves, dangerous goods management, valuable goods management system, etc. It can also be applied to applications.
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Abstract
Description
Claims
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
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US10/590,964 US7446729B2 (en) | 2004-09-22 | 2005-09-22 | Loop antenna unit and radio communication medium processor |
GB0616218A GB2431053B (en) | 2004-09-22 | 2006-08-15 | Loop antenna unit and radio communication medium processor |
Applications Claiming Priority (6)
Application Number | Priority Date | Filing Date | Title |
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JP2004275318A JP2006093977A (ja) | 2004-09-22 | 2004-09-22 | ループアンテナユニット及び無線通信媒体処理装置 |
JP2004-275318 | 2004-09-22 | ||
JP2004-287051 | 2004-09-30 | ||
JP2004287051 | 2004-09-30 | ||
JP2005139545A JP4349319B2 (ja) | 2004-09-30 | 2005-05-12 | 無線通信媒体処理装置 |
JP2005-139545 | 2005-05-12 |
Publications (1)
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WO2006033408A1 true WO2006033408A1 (ja) | 2006-03-30 |
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PCT/JP2005/017516 WO2006033408A1 (ja) | 2004-09-22 | 2005-09-22 | ループアンテナユニット及び無線通信媒体処理装置 |
Country Status (3)
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US (1) | US7446729B2 (ja) |
GB (1) | GB2431053B (ja) |
WO (1) | WO2006033408A1 (ja) |
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GB2438245A (en) * | 2006-05-18 | 2007-11-21 | Deltenna Ltd | Loop-like antenna element and array |
GB2438245B (en) * | 2006-05-18 | 2010-05-05 | Deltenna Ltd | Antenna element |
US7973729B2 (en) * | 2006-08-08 | 2011-07-05 | Sensormatic Electronics, LLC | Thin-film EAS and RFID antennas |
JP2014027464A (ja) * | 2012-07-26 | 2014-02-06 | Dexerials Corp | アンテナ装置及び通信装置 |
JP2014200086A (ja) * | 2013-03-29 | 2014-10-23 | 株式会社村田製作所 | アンテナ装置 |
Also Published As
Publication number | Publication date |
---|---|
GB2431053A (en) | 2007-04-11 |
GB2431053A8 (en) | 2007-07-06 |
US20070139285A1 (en) | 2007-06-21 |
US7446729B2 (en) | 2008-11-04 |
GB0616218D0 (en) | 2006-09-27 |
GB2431053B (en) | 2009-01-28 |
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