WO2013011865A1 - アンテナモジュール、アンテナ装置、rfidタグおよび通信端末装置 - Google Patents
アンテナモジュール、アンテナ装置、rfidタグおよび通信端末装置 Download PDFInfo
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- WO2013011865A1 WO2013011865A1 PCT/JP2012/067537 JP2012067537W WO2013011865A1 WO 2013011865 A1 WO2013011865 A1 WO 2013011865A1 JP 2012067537 W JP2012067537 W JP 2012067537W WO 2013011865 A1 WO2013011865 A1 WO 2013011865A1
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- conductor
- loop
- planar
- planar conductor
- antenna
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- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
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- 239000011889 copper foil Substances 0.000 description 1
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Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B5/00—Near-field transmission systems, e.g. inductive or capacitive transmission systems
- H04B5/20—Near-field transmission systems, e.g. inductive or capacitive transmission systems characterised by the transmission technique; characterised by the transmission medium
- H04B5/24—Inductive coupling
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q9/00—Electrically-short antennas having dimensions not more than twice the operating wavelength and consisting of conductive active radiating elements
- H01Q9/04—Resonant antennas
- H01Q9/0407—Substantially flat resonant element parallel to ground plane, e.g. patch antenna
- H01Q9/045—Substantially flat resonant element parallel to ground plane, e.g. patch antenna with particular feeding means
- H01Q9/0457—Substantially flat resonant element parallel to ground plane, e.g. patch antenna with particular feeding means electromagnetically coupled to the feed line
-
- 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
- G06K19/07773—Antenna details
- G06K19/07777—Antenna details the antenna being of the inductive type
- G06K19/07779—Antenna details the antenna being of the inductive type the inductive antenna being a coil
- G06K19/07783—Antenna details the antenna being of the inductive type the inductive antenna being a coil the coil being planar
-
- 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
- G06K19/07773—Antenna details
- G06K19/07794—Antenna details the record carrier comprising a booster or auxiliary antenna in addition to the antenna connected directly to the integrated circuit
-
- 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
- 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
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B5/00—Near-field transmission systems, e.g. inductive or capacitive transmission systems
- H04B5/70—Near-field transmission systems, e.g. inductive or capacitive transmission systems specially adapted for specific purposes
- H04B5/77—Near-field transmission systems, e.g. inductive or capacitive transmission systems specially adapted for specific purposes for interrogation
Definitions
- the present invention relates to an antenna module, an antenna device, an RFID tag, and a communication terminal device used for near field communication.
- An RFID system that communicates between a reader / writer and an RFID (Radio Frequency Identification) tag in a non-contact manner and transmits information between the reader / writer and the RFID tag has become widespread.
- an HF band RFID system using a 13 MHz band and a UHF band RFID system using a 900 MHz band are generally used.
- the RFID system for article management has a long communication distance, and a large number of tags can be read and written in a lump. Therefore, the RFID system in the UHF band is considered promising.
- the RFID tag used in the RFID system includes an RFIC chip for processing a radio signal and an antenna element for transmitting and receiving the radio signal.
- a dipole antenna or a loop antenna is used as an antenna element.
- the loop antenna is a magnetic field radiation type antenna and has a short communication distance, but can be reduced in size, and thus is useful as an antenna for a small RFID tag.
- the opening surface of the loop antenna faces a metal body, for example, if the article to be attached is a metal body, a vortex that cancels the magnetic field change of the loop antenna on the metal body. Since current is generated, it is difficult to secure a sufficient communication distance.
- FIG. 1A is a perspective view of a reader / writer antenna disclosed in Patent Document 1
- FIG. 1B is a cross-sectional view of the A-A ′ portion in FIG.
- a soft magnetic material 5 is disposed between an antenna coil 4 whose both ends are connected to an electronic circuit 8 and a metal surface 6.
- the magnetic flux 9 generated in the antenna coil 4 passes through the soft magnetic material 5 and hardly reaches the inside of the metal surface 6 as shown in FIG. A change in resonance frequency and an increase in loss are suppressed.
- the present invention provides an antenna module, an antenna device, an RFID tag, and a communication terminal device in which an increase in loss due to eddy current generated on a metal surface and a change in resonance frequency are suppressed without increasing the size. It is aimed.
- the antenna device of the present invention A loop conductor to which the feed circuit is connected or coupled; A magnetic sheet arranged in parallel with the loop-shaped conductor; An antenna module disposed opposite to a planar conductor having a larger area than the loop-shaped conductor, The loop-shaped conductor has a first portion facing the planar conductor through the magnetic sheet and a direct conduction (DC direct coupling) or electromagnetic coupling to the planar conductor without the magnetic sheet. And two parts.
- the planar conductor acts as a radiating element.
- the loop-shaped conductor has a feeding point connected to or coupled to the feeding circuit and a current maximum point formed at a position (on the opposite side) away from the feeding point, and the second portion is the current A region including the maximum point is preferable.
- the magnetic sheet has a first main surface and a second main surface facing each other, and the second main surface faces the planar conductor,
- the first portion of the loop-shaped conductor is provided on the first main surface of the magnetic sheet, and the second portion of the loop-shaped conductor is provided on the second main surface of the magnetic sheet. It is preferable.
- the loop-shaped conductor is composed of a first auxiliary conductor and a second auxiliary conductor that are coupled via a capacitance at at least two locations.
- An antenna device includes the antenna module according to any one of (1) to (4) and a planar conductor, and the loop conductor has a plane formed by the loop conductor. It is characterized in that it is disposed close to the planar conductor along the surface.
- the loop-shaped conductor is disposed at a position where the second portion is closer to the edge side than the center (center of gravity) of the planar conductor.
- the second portion of the loop-shaped conductor is linear, and the loop-shaped conductor is parallel to the linear edge of the planar conductor. It is preferable to arrange so that.
- the planar conductor is preferably a ground conductor formed on a printed wiring board.
- An RFID tag includes the antenna module according to any one of (1) to (4) above and an RFIC element that is directly connected to or electromagnetically coupled to the loop conductor.
- a communication terminal device includes the antenna device according to any one of (5) to (8) above and an RFIC element that is directly connected or electromagnetically coupled to the loop-shaped conductor. It is a feature.
- planar conductor is preferably a ground conductor formed on a printed wiring board.
- the RFIC element is preferably used in a UHF band RFID system that matches the loop conductor in the UHF band.
- an antenna device, an RFID tag, a communication terminal device, and the like in which an increase in loss due to eddy current generated on a metal surface and a change in resonance frequency are suppressed can be configured without increasing the size.
- FIG. 1A is a perspective view of a reader / writer antenna disclosed in Patent Document 1
- FIG. 1B is a cross-sectional view taken along the line A-A ′ in FIG. 2A is an external perspective view of the antenna module 101 according to the first embodiment
- FIG. 2B is an exploded perspective view thereof.
- 3A is a perspective view of the RFID tag 301
- FIG. 3B is an exploded perspective view thereof.
- FIG. 4 is a perspective view of the antenna device 201.
- 5A is a perspective view of the communication terminal device 401
- FIG. 5B is an exploded perspective view thereof.
- 6A is a plan view of the communication terminal device 401
- FIG. 6B is a cross-sectional view of the B-B ′ portion of FIG. 6A.
- FIG. 7A is an equivalent circuit diagram of the RFID tag 301.
- FIG. 7B is a diagram showing the relationship between the feeding point of the loop conductor 11 and the maximum current point.
- FIG. 7C is a diagram illustrating a state of current flowing through the loop-shaped conductor 11 of the RFID tag and current flowing through the planar conductor 12.
- FIG. 8A shows an example in which the second portion SP facing the planar conductor without the magnetic sheet 13 is only one side of the rectangular shape of the loop-shaped conductor 11, and FIG. 8B shows the second portion. In this example, the SP is further narrowed so that the first part FP extends to both sides of one side of the rectangle.
- FIG. 8A shows an example in which the second portion SP facing the planar conductor without the magnetic sheet 13 is only one side of the rectangular shape of the loop-shaped conductor 11, and FIG. 8B shows the second portion. In this example, the SP is further narrowed so that the first part FP extends to both sides of one side of the rectangle.
- FIG. 8C shows an example in which a magnetic sheet is interposed (covered) on only one side of the rectangle that is the shape of the loop-shaped conductor 11 and the remaining three sides are the second portion SP.
- FIG. 9 is a diagram showing characteristics of each RFID tag in the state shown in FIGS. 8A, 8B, and 8C.
- FIG. 10 is a perspective view of the communication terminal device 403 of the third embodiment.
- FIG. 11A is an enlarged view of a mounting portion of the RFID tag 303, and FIG. 11B is a left side view thereof.
- FIG. 12 is a perspective view of a communication terminal device 404 according to the fourth embodiment.
- FIG. 13 is an equivalent circuit diagram of the RFID tag portion shown in FIG. FIG.
- FIG. 14 shows the return loss characteristic viewed from the power feeding circuit of the RFID tag portion shown in FIG.
- FIG. 15A is a plan view of a communication terminal device 405 according to the fifth embodiment
- FIG. 15B is a cross-sectional view taken along the line B-B ′ of FIG.
- FIG. 16 is a diagram illustrating a state of current flowing through the loop-shaped conductor 11 of the RFID tag and current flowing through the planar conductor 12.
- FIG. 17 is an exploded perspective view of the RFID tag 306A of the sixth embodiment.
- FIG. 18 is an exploded perspective view of another RFID tag 306B of the sixth embodiment.
- FIG. 2A is an external perspective view of the antenna module 101 according to the first embodiment
- FIG. 2B is an exploded perspective view thereof.
- the antenna module 101 includes a loop conductor 11 and a magnetic sheet 13.
- the loop-shaped conductor 11 is a rectangular loop-shaped conductor pattern formed on the base sheet 10. As shown later, the antenna module 101 is configured by being affixed, abutted on, or placed close to a planar conductor.
- the magnetic sheet 13 is disposed between the loop conductor 11 and the planar conductor.
- the loop-shaped conductor 11 has a first portion FP that faces the planar conductor via the magnetic sheet 13 and a second portion SP that is electromagnetically coupled to the planar conductor 12 without the magnetic sheet 13. That is, the magnetic sheet 13 is interposed between the first portion FP of the loop-shaped conductor 11 and the planar conductor, and the magnetic sheet 13 is not interposed between the second portion SP of the loop-shaped conductor 11 and the planar conductor.
- the base sheet 10 is a flexible base sheet such as a PET film or a polyimide film, and the loop conductor 11 is obtained by patterning a metal foil such as a copper foil.
- the magnetic sheet 13 is, for example, a ferrite ceramic formed in a thin plate shape. Or the resin sheet formed by disperse
- FIG. 3A is a perspective view of the RFID tag 301
- FIG. 3B is an exploded perspective view thereof.
- the RFID tag 301 is obtained by mounting the RFIC element 14 on the base sheet 10 of the antenna module 101 shown in FIG.
- the RFIC element 14 includes at least two terminals, the first terminal is connected to the first end of the loop-shaped conductor 11, and the second terminal is connected to the second end of the loop-shaped conductor 11.
- the RFID tag 301 is affixed or placed close to a planar conductor.
- the magnetic sheet 13 is disposed between the loop conductor 11 and the planar conductor. This constitutes an article with an RFID tag and a communication terminal device having an RFID function.
- FIG. 4 is a perspective view of the antenna device 201.
- the antenna device 201 includes the antenna module 101 and the planar conductor 12 shown in FIG.
- the planar conductor 12 has a larger area than the loop conductor 11, and the loop conductor 11 is within the range of the planar conductor 12 in plan view.
- the magnetic sheet 13 is disposed between the loop conductor 11 and the planar conductor 12.
- the magnetic material sheet 13 is interposed between the first portion FP of the loop-shaped conductor 11 and the planar conductor 12, and the magnetic material sheet 13 is not interposed between the second portion SP of the loop-shaped conductor 11 and the planar conductor 12.
- the planar conductor 12 is a ground conductor of a printed wiring board, a metal plate, a metal member of an electronic component or a structural component, or the like.
- FIG. 5A is a perspective view of the communication terminal device 401
- FIG. 5B is an exploded perspective view thereof.
- the communication terminal device 401 includes a planar conductor 12 and an RFID tag 301.
- the planar conductor 12 is a ground conductor formed on a printed wiring board, for example. That is, the printed wiring board accommodated in the housing of the communication terminal device can also be used as a planar conductor.
- planar conductor 12 is a metal article or an article having a planar conductor
- an article with an RFID tag is configured by sticking to the article.
- FIG. 6A is a plan view of the communication terminal device 401
- FIG. 6B is a cross-sectional view of the B-B ′ portion of FIG. 6A.
- the circuit symbol of the capacitor in FIG. 6B symbolizes the capacitance generated between the second portion SP of the loop conductor 11 and the planar conductor 12.
- FIG. 7A is an equivalent circuit diagram of the RFID tag 301.
- the RFIC element 14 includes a capacitor Ci, and the inductors L1, L2, L3 by the loop conductor 11 and the capacitor Ci constitute an LC resonance circuit.
- the inductances of the inductors L1 and L3 in the portion shielded by the magnetic sheet 13 in the loop conductor 11 are relatively small, and the inductance of the inductor L2 in the portion not shielded by the magnetic sheet 13 is relatively large.
- FIG. 7B is a diagram showing the relationship between the feeding point of the loop conductor 11 and the maximum current point.
- An RFIC element 14 (a power feeding circuit of the RFIC element 14) is connected to the first end and the second end of the loop conductor 11.
- a differential potential is applied to the loop conductor 11 from the power supply circuit at a resonance frequency at which the loop conductor 11 is impedance-matched to the power supply circuit, and the center position between the first end and the second end of the loop conductor 11 (the power supply circuit). The position farthest from) is the maximum current point.
- This current maximum point is also a virtual ground potential.
- the resonance frequency is a frequency in the UHF band such as the 900 MHz band.
- FIG. 7C is a diagram showing a state of current flowing in the loop-shaped conductor 11 of the RFID tag and current flowing in the planar conductor 12.
- the loop conductor 11 and the planar conductor 12 are electromagnetically coupled by the current IL flowing through the loop conductor 11, An induced current IA flows through the planar conductor 12.
- the RFID tag 301 is arranged on the planar conductor 12 so that the second portion SP of the loop-shaped conductor 11 is along one edge of the planar conductor 12.
- the second portion SP of the loop-shaped conductor 11 only needs to be disposed at a position closer to one edge side than the center (center of gravity) of the planar conductor 12. Moreover, about the longitudinal direction of a planar conductor, it should just be arrange
- the propagation of the induced current IA through the planar conductor 12 causes the planar conductor 12 to act as a radiating element.
- the planar conductor 12 acts as a half-wave radiation element (dipole antenna).
- the length L in the longitudinal direction of the planar conductor 12 is about a half wavelength of the operating frequency, the direction of the current flowing through the two edge portions OE is the same direction, and the current that circulates around the outer periphery of the planar conductor 12 Does not flow.
- the planar conductor 12 disposed in the vicinity of the loop-shaped conductor 11 can be used as an antenna element, and is small and thin without increasing the size of the loop-shaped conductor 11 and has a large communication distance.
- a communication terminal device 401 having an RFID tag is obtained.
- the second portion SP of the loop conductor 11 includes the maximum current point. It is preferable that the planar conductor 12 is electromagnetically coupled in a region including the maximum current point. That is, the loop conductor 11 has a low current density in the vicinity of the feeding point and a high current density at a position farthest from the feeding point. Therefore, if the loop-shaped conductor 11 and the planar conductor 12 are coupled by the second portion SP including the portion of the loop-shaped conductor 11 having the highest current density, the loop-shaped conductor 11 and the planar conductor 12 are unnecessary. The coupling (coupling in which the current flowing through the planar conductor 12 due to coupling does not contribute to radiation) is suppressed, and the RFID tag with a small insertion loss and the communication terminal device 401 including the RFID tag can be obtained.
- the loop-shaped conductor 11 is preferably arranged so that the surface of the loop-shaped conductor 11 is arranged close to the planar conductor 12 along the plane of the planar conductor 12. In other words, it is preferable that the loop-shaped conductor 11 has its central axis facing the normal direction of the planar conductor 12. According to the present invention, since such an arrangement is possible, the RFID tag can be arranged along the surface of the planar conductor 12, and the entire thickness can be reduced.
- the loop-shaped conductor 11 is preferably disposed close to the planar conductor 12 so that the second portion SP is in the vicinity of the edge of the planar conductor 12, and in particular, the second portion SP of the loop-shaped conductor 11 is It is preferable that the loop-shaped conductor 11 is formed in a straight line and is disposed close to the flat conductor 12 so as to be substantially parallel to the straight edge of the flat conductor 12. By arranging in this way, the distance between one of the main radiation sites (the edge of the planar conductor 12) and the maximum current point of the loop conductor 11 is minimized while suppressing eddy current loss in the loop conductor 11. Thus, power loss can be reduced.
- the RFID tag 301 is disposed in the vicinity of the battery pack, and the metal casing of the battery pack or shield case is used as the planar conductor. be able to. Moreover, if it is an electronic device provided with the metal housing, the metal housing can also be utilized as a planar conductor.
- FIG. 8A shows an example in which the second portion SP facing the planar conductor without the magnetic sheet 13 is only one side of the rectangular shape of the loop-shaped conductor 11, and FIG. 8B shows the second portion.
- the SP is further narrowed so that the first part FP extends to both sides of one side of the rectangle.
- 8C contrary to FIG. 8A, a magnetic sheet is interposed (covered) on only one side of the rectangular shape of the loop-shaped conductor 11, and the remaining three sides are placed on the first side.
- FIG. 8C shows an example in which the second portion SP facing the planar conductor without the magnetic sheet 13 is only one side of the rectangular shape of the loop-shaped conductor 11, and FIG. 8B shows the second portion.
- the SP is further narrowed so that the first part FP extends to both sides of one side of the rectangle.
- 8C contrary to FIG. 8A, a magnetic sheet is interposed (covered) on only one side of the rectangular shape of the loop-shaped conductor 11, and the remaining three sides are placed on the first
- FIG. 9 is a diagram showing the characteristics of each RFID tag in the state shown in FIG. 8 (A), FIG. 8 (B), and FIG. 8 (C).
- the ratio of the second portion SP is smaller than the first portion FP of the loop conductor 11, the Q value is high, and the gain is maximum at the center frequency.
- the electric field coupling between the loop-shaped conductor 11 and the planar conductor 12 becomes stronger as the ratio of the second portion SP becomes larger than the first portion FP of the loop-shaped conductor 11.
- electric field coupling is performed even in a portion where the potential difference of the loop conductor 11 is large, and electric field coupling is performed at two points having different potential differences in the loop conductor 11, so that the pass band is widened and the gain peak is descend. Therefore, what is necessary is just to determine the ratio of 2nd part SP with respect to 1st part FP of the loop-shaped conductor 11 according to a required frequency bandwidth and gain.
- FIG. 10 is a perspective view of the communication terminal device 403 of the third embodiment.
- FIG. 11A is an enlarged view of a mounting portion of the RFID tag 303
- FIG. 11B is a left side view thereof.
- the communication terminal device 403 includes a planar conductor 12 and an RFID tag 303.
- the structure of the RFID tag 303 is different from the RFID tag 301 shown in the first and second embodiments.
- a part of the base sheet 10 on which the loop-shaped conductor 11 having a rectangular loop shape is patterned is folded from the first main surface (upper surface) of the magnetic material sheet 13 to the second main surface (lower surface). .
- the RFID tag 303 is attached to the planar conductor 12 with an adhesive layer 15.
- the other part is a first part FP in which the magnetic sheet 13 is interposed when viewed from the planar conductor 12.
- the portion along the magnetic sheet can constitute the second portion SP of the loop conductor.
- the entire base sheet 10 is disposed so as to surround the magnetic sheet, it is easy to handle the RFID tag and mount it on the planar conductor 12.
- FIG. 12 is a perspective view of a communication terminal device 404 according to the fourth embodiment.
- the loop-shaped conductor is composed of a first auxiliary conductor 11A and a second auxiliary conductor 11B.
- the first auxiliary conductor 11A and the second auxiliary conductor 11B are coupled by capacitors C1 and C2.
- the capacitances C1 and C2 in the figure are merely represented by symbols in a lumped constant circuit, and are actually distributed capacitances.
- the second portion SP is visible from the planar conductor 12 because the magnetic sheet 13 is not interposed, but the first portion FP is not the magnetic sheet 13. Due to the interposition, the planar conductor 12 does not look equivalent.
- FIG. 13 is an equivalent circuit diagram of the RFID tag portion shown in FIG.
- the first auxiliary conductor 11A is represented by inductors L1, L2, and L3
- the second auxiliary conductor 11B is represented by inductors L4, L5, and L6.
- a first LC resonance circuit is configured by the capacitor Ci in the RFIC element 14 and the inductors L1, L2, and L3 of the first auxiliary conductor 11A.
- the capacitors C1 and C2 between the first auxiliary conductor 11A and the second auxiliary conductor 11B and the inductors L4, L5 and L6 of the second auxiliary conductor 11B constitute a second LC resonance circuit.
- the resonance frequency f1 of the first LC resonance circuit and the resonance frequency f2 of the second LC resonance circuit can be expressed as follows.
- f1 1 / [2 ⁇ ⁇ (Ci (L1 + L2 + L3) ⁇ ]
- f2 1 / [2 ⁇ ⁇ (C1 + C2) (L1 + L2 + L3 + L4 + L5 + L6) ⁇ ] Since there is a mutual inductance between the inductance (L1, L2, L3) of the first auxiliary conductor 11A and the inductance (L4, L5, L6) of the second auxiliary conductor 11B, the first LC resonance circuit and the second The LC resonant circuits are coupled to each other.
- FIG. 14 shows a return loss characteristic viewed from the power feeding circuit of the RFID tag portion shown in FIG.
- there are two resonance frequencies f1 and f2 and f1 and f2 are different from each other, so that a wide band can be obtained as shown in FIG.
- the frequency interval between the two poles of the return loss characteristic further increases due to the mutual inductance.
- the mutual inductance can be adjusted by changing the shapes of the first auxiliary conductor and the second auxiliary conductor, shifting the position, or partially sandwiching the magnetic material sheet between them.
- the frequency interval of the poles may be determined.
- FIG. 15A is a plan view of the communication terminal device 405 of the fifth embodiment
- FIG. 15B is a cross-sectional view of the BB ′ portion of FIG. 15A.
- the loop-shaped conductor 11 is patterned on the lower surface of the base sheet 10.
- the loop-shaped conductor 11 includes a first portion FP that faces the planar conductor via the magnetic sheet 13 and a second portion SP that is directly connected to the planar conductor 12 without the magnetic sheet 13.
- the RFIC element 14 (the power supply circuit of the RFIC element 14) is connected to the first end and the second end of the loop conductor 11.
- the RFIC element includes a capacitance, and this capacitance and the inductance of the loop conductor 11 constitute an LC resonance circuit.
- a differential potential is applied to the loop conductor 11 from the power supply circuit at a resonance frequency at which the loop conductor 11 is impedance-matched to the power supply circuit, and the center position between the first end and the second end of the loop conductor 11 (the power supply circuit). The position farthest from) is the maximum current point. This current maximum point is also a virtual ground potential.
- the resonance frequency is a frequency in the UHF band such as the 900 MHz band.
- FIG. 16 is a diagram illustrating a state of current flowing through the loop-shaped conductor 11 of the RFID tag and current flowing through the planar conductor 12.
- the resonance frequency UHF band
- the current IA flows through the planar conductor 12 due to the current IL flowing through the loop conductor 11. Since it is not the inductive coupling shown in FIG. 7C but direct coupling, the direction of the current IA is the same direction as the current IL flowing through the loop conductor 11.
- the current density of the edge portion OE of the planar conductor 12 is high due to the edge effect.
- the RFID tag 301 is arranged on the planar conductor 12 so that the second portion SP of the loop-shaped conductor 11 is along one edge of the planar conductor 12.
- the second portion SP of the loop-shaped conductor 11 only needs to be disposed at a position closer to one edge side than the center (center of gravity) of the planar conductor 12.
- the planar conductor 12 acts as a radiating element.
- planar conductor 12 disposed in the vicinity of the loop-shaped conductor 11 can be used as an antenna element, and is small and thin and has a large communication distance without increasing the size of the loop-shaped conductor 11.
- a communication terminal device 405 provided with an RFID tag is obtained.
- the second portion SP of the loop-shaped conductor 11 includes the maximum current point and is directly connected (directly connected) to the planar conductor 12 in a region including the maximum current point. That is, the loop conductor 11 has a low current density in the vicinity of the feeding point and a high current density at a position farthest from the feeding point. Therefore, if the loop-shaped conductor 11 and the planar conductor 12 are coupled by the second portion SP including the portion of the loop-shaped conductor 11 having the highest current density, the loop-shaped conductor 11 and the planar conductor 12 are unnecessary. The coupling (coupling in which the current flowing through the planar conductor 12 due to the coupling does not contribute to radiation) is suppressed, and the RFID tag with a small insertion loss and the communication terminal device 405 including the RFID tag can be obtained.
- the loop-shaped conductor 11 is preferably disposed on the planar conductor 12 so that the second portion SP is in the vicinity of the edge of the planar conductor 12, and in particular, the second portion SP of the loop-shaped conductor 11 is a straight line. It is preferable that the loop-shaped conductor 11 is disposed in the vicinity of the planar conductor 12 so as to be substantially parallel to the linear edge of the planar conductor 12. By arranging in this way, the distance between one of the main radiation sites (the edge of the planar conductor 12) and the maximum current point of the loop conductor 11 is minimized while suppressing eddy current loss in the loop conductor 11. Thus, power loss can be reduced.
- FIG. 17 is an exploded perspective view of the RFID tag 306A of the sixth embodiment.
- a part (three sides) 11-1 of the loop conductor is formed on the upper surface of the ferrite sheet 13A, and a part (one side) 11-2 of the loop conductor is formed on the lower surface of the ferrite sheet 13B.
- the loop conductors 11-1 and 11-2 are connected via via conductors formed in the ferrite sheets 13A, 13B, and 13C.
- An RFIC element 14 is connected to a part 11-1 of the loop conductor. Usually, after a laminated body composed of three ferrite sheets 13A, 13B, and 13C is formed, the RFIC element 14 is mounted on the laminated body.
- the ferrite sheet is interposed between the loop conductor portion 11-1 and the planar conductor. 13C will intervene. That is, the part 11-1 of the loop conductor is the first part FP of the loop conductor. Since the ferrite sheet 13C is not interposed between the loop-shaped conductor portion 11-2 and the planar conductor, the loop-shaped conductor portion 11-2 is the second portion SP of the loop-shaped conductor.
- FIG. 18 is an exploded perspective view of another RFID tag 306B of the sixth embodiment.
- a part (three sides) 11-1 of a loop conductor is formed on the upper surface of the dielectric (nonmagnetic) sheet 16A, and a part of the loop conductor (on the upper surface of the dielectric (nonmagnetic) sheet 16B ( One side) 11-2 is formed.
- a mounting electrode 17 is formed on the lower surface of the dielectric sheet 16B.
- the loop conductors 11-1 and 11-2 are connected via via conductors formed in the dielectric sheet 16A and the ferrite sheet 13C.
- An RFIC element 14 is connected to a part 11-1 of the loop conductor.
- the loop-shaped conductor portion 11-1 is the first portion FP of the loop-shaped conductor
- the loop-shaped conductor portion 11-2 is the second portion SP of the loop-shaped conductor.
- the RFID tag 306B is mounted on the planar conductor by the mounting electrode 17, the loop-shaped conductor portion 11-2 is opposed to the planar conductor via the dielectric sheet 16B.
- -2 is electromagnetically coupled to the planar conductor.
- a part 11-2 of the loop conductor is formed in the same plane as the mounting electrode 17, a via conductor is formed on the dielectric sheet 16B, and a part of the loop conductor 11-2 is looped through the via conductor. If the configuration is such that it is connected to the part 11-1 of the conductor, the part 11-2 of the loop conductor can be directly conducted (DC directly connected) to the planar conductor.
- the RFIC element shown in each of the above embodiments is a circuit including a memory circuit and a logic circuit, but may be an IC element including only a high-frequency circuit. Further, an RFIC chip and a matching circuit such as a resonance circuit connected to the chip may be provided. Then, the matching circuit may be configured such that a loop conductor is electromagnetically coupled.
- the antenna module of the present invention can be used not only as an RFID tag in a UHF band RFID system but also as an antenna module for a reader / writer. Moreover, it can also be used in other frequency bands, such as HF band, and can also be used in communication systems other than an RFID system.
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Abstract
Description
給電回路が接続または結合されるループ状導体と、
前記ループ状導体に対して並設された磁性体シートと、
を備え、前記ループ状導体より面積の大きな平面導体に対向配置されるアンテナモジュールであって、
前記ループ状導体は、前記磁性体シートを介して前記平面導体に対向する第1部分と、前記磁性体シートを介さずに前記平面導体に対して直接導通(DC直結)または電磁界結合する第2部分とを有することを特徴とする。
前記ループ状導体の前記第1部分は、前記磁性体シートの前記第1主面に設けられていて、前記ループ状導体の前記第2部分は前記磁性体シートの前記第2主面に設けられていることが好ましい。
本発明の第1の実施形態のアンテナモジュール、アンテナ装置、RFIDタグおよび通信端末装置について各図を参照して順に説明する。
図2(A)は第1の実施形態に係るアンテナモジュール101の外観斜視図、図2(B)はその分解斜視図である。
第2の実施形態ではループ状導体の第1部分と第2部分の大きさに違いによる特性の違いについて示す。
図8(A)は磁性体シート13を介さずに平面導体に対向する第2部分SPをループ状導体11の形状である矩形のほぼ一辺のみとした例、図8(B)は第2部分SPをさらに狭めて、矩形の一辺の両側まで第1部分FPとした例である。また、図8(C)は図8(A)とは逆に、ループ状導体11の形状である矩形のほぼ一辺のみに対して磁性体シートを介在させ(覆い)、残りの三辺を第2部分SPとした例である。図8(C)の状態では、ループ状導体11の電位差がある(電圧の高い)ところが平面導体12に対向する。図8(B)の状態では、ループ状導体11の電位差がある(電圧の高い)ところは平面導体12にほとんど対向しないことになる。
図10は第3の実施形態の通信端末装置403の斜視図である。図11(A)はRFIDタグ303の搭載部の拡大図、図11(B)はその左側面図である。この通信端末装置403は平面導体12とRFIDタグ303を備えている。RFIDタグ303の構造が第1・第2の実施形態で示したRFIDタグ301とは異なる。RFIDタグ303は矩形ループ状のループ状導体11がパターン形成された基材シート10の一部が磁性体シート13の第1主面(上面)から第2主面(下面)に折り返されている。RFIDタグ303は接着層15で平面導体12に貼着されている。
図12は第4の実施形態の通信端末装置404の斜視図である。ループ状導体は第1補助導体11Aおよび第2補助導体11Bで構成されている。第1補助導体11Aと第2補助導体11Bは容量C1,C2で結合する。但し、図中の容量C1,C2は集中定数回路的に記号で表しているだけであり、実際には分布容量である。この二つの補助導体11A,11Bで構成されるループ状導体のうち、第2部分SPは磁性体シート13が介在していないので平面導体12から見えるが、第1部分FPは磁性体シート13の介在によって、平面導体12からは等価的に見えない。
f2=1/〔2π√{(C1+C2)(L1+L2+L3+L4+L5+L6)}〕
第1補助導体11Aのインダクタンス(L1,L2,L3)と第2補助導体11Bのインダクタンス(L4,L5,L6)との間に相互インダクタンスがあるので、上記第1のLC共振回路と第2のLC共振回路は互いに結合する。
図15(A)は第5の実施形態の通信端末装置405の平面図、図15(B)は図15(A)のB-B’部分の断面図である。この例では、基材シート10の下面にループ状導体11がパターン化されている。ループ状導体11は、磁性体シート13を介して平面導体に対向する第1部分FPと、磁性体シート13を介さずに平面導体12に直接導通する第2部分SPとを有する。
第6の実施形態では、複数のシートを積層して構成されたRFIDタグの例を示す。
図17は第6の実施形態のRFIDタグ306Aの分解斜視図である。フェライトシート13Aの上面にループ状導体の一部(三辺)11-1が形成されていて、フェライトシート13Bの下面にループ状導体の一部(一辺)11-2が形成されている。そして、ループ状導体11-1と11-2はフェライトシート13A,13B,13Cに形成されたビア導体を介して接続されている。これらのフェライトシート13A,13Bは低透磁率(例えば比透磁率μr=1)のフェライトであり、フェライトシート13Cは高透磁率(例えば比透磁率μr=100)のフェライトである。ループ状導体の一部11-1にはRFIC素子14が接続されている。通常は、3つのフェライトシート13A,13B,13Cによる積層体が構成された後に、その積層体にRFIC素子14が搭載される。
以上の各実施形態で示したRFIC素子は、メモリー回路やロジック回路を含んだ回路であるが、高周波回路のみを備えたIC素子であってもよい。また、RFICチップとこのチップに接続された共振回路等の整合回路を有していてもよい。そして、この整合回路にループ状導体が電磁界結合するように構成してもよい。
SP…第2部分
L1,L2,L3…インダクタ
L4,L5,L6…インダクタ
OE…エッジ部
10…基材シート
11…ループ状導体
11A…第1補助導体
11B…第2補助導体
12…平面導体
13…磁性体シート
13A,13B,13C…フェライトシート
14…RFIC素子
15…接着層
16A,16B…誘電体シート
17…実装用電極
101…アンテナモジュール
201…アンテナ装置
301,303…RFIDタグ
306A,306B…RFIDタグ
401,403,404,405…通信端末装置
Claims (12)
- 給電回路が接続または結合されるループ状導体と、
前記ループ状導体に対して並設された磁性体シートと、
を備え、前記ループ状導体より面積の大きな平面導体に対向配置されるアンテナモジュールであって、
前記ループ状導体は、前記磁性体シートを介して前記平面導体に対向する第1部分と、前記磁性体シートを介さずに前記平面導体に対して直接導通または電磁界結合する第2部分とを有することを特徴とするアンテナモジュール。 - 前記ループ状導体は、前記給電回路に接続または結合される給電点および前記給電点から離れた位置に形成される電流最大点を有し、前記第2部分は前記電流最大点を含む領域である、請求項1に記載のアンテナモジュール。
- 前記磁性体シートは互いに対向する第1主面および第2主面を有し、前記第2主面は前記平面導体に対面し、
前記ループ状導体の前記第1部分は、前記磁性体シートの前記第1主面に設けられていて、前記ループ状導体の前記第2部分は前記磁性体シートの前記第2主面に設けられている、請求項1または2に記載のアンテナモジュール。 - 前記ループ状導体は、少なくとも二箇所で容量を介して結合する第1補助導体および第2補助導体で構成されている、請求項1~3のいずれかに記載のアンテナモジュール。
- 請求項1~4のいずれかに記載のアンテナモジュールおよび平面導体で構成され、
前記ループ状導体は、このループ状導体が構成する面が前記平面導体の面に沿って前記平面導体に近接配置されている、アンテナ装置。 - 前記ループ状導体は、前記第2部分が前記平面導体の中心より縁端部側に近くなる位置に配置されている、請求項5に記載のアンテナ装置。
- 前記ループ状導体の前記第2部分は直線状であり、前記ループ状導体は前記平面導体の直線状の縁端部に対して平行になるように配置されている、請求項5または6に記載のアンテナ装置。
- 前記平面導体は、プリント配線板に形成されたグランド導体である、請求項5~7のいずれかに記載のアンテナ装置。
- 請求項1~4のいずれかに記載のアンテナモジュールと、このアンテナモジュールの前記ループ状導体に直接接続または電磁界結合されたRFIC素子とを備えたRFIDタグ。
- 請求項5~8のいずれかに記載のアンテナ装置と、前記ループ状導体に直接接続または電磁界結合されたRFIC素子とを備えた通信端末装置。
- 前記平面導体はプリント配線板に形成されたグランド導体である、請求項10に記載の通信端末装置。
- 前記RFIC素子は前記ループ状導体にUHF帯で整合する、UHF帯のRFIDシステムに用いられる、請求項10または11に記載の通信端末装置。
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CN201290000603.6U CN203850432U (zh) | 2011-07-19 | 2012-07-10 | 天线装置以及通信终端装置 |
US14/031,270 US8814056B2 (en) | 2011-07-19 | 2013-09-19 | Antenna device, RFID tag, and communication terminal apparatus |
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- 2012-07-10 JP JP2013524662A patent/JP5660217B2/ja not_active Expired - Fee Related
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CN105075010A (zh) * | 2013-02-22 | 2015-11-18 | 诺基亚技术有限公司 | 用于无线耦合的装置及方法 |
US10211537B2 (en) | 2013-02-22 | 2019-02-19 | Nokia Technologies Oy | Apparatus and methods for wireless coupling |
US9722313B2 (en) | 2013-03-19 | 2017-08-01 | Dexerials Corporation | Antenna device and electronic equipment |
WO2014148314A1 (ja) * | 2013-03-19 | 2014-09-25 | デクセリアルズ株式会社 | アンテナ装置及び電子機器 |
JP2014191678A (ja) * | 2013-03-28 | 2014-10-06 | Toppan Forms Co Ltd | 非接触型データ受送信体 |
JP2015070405A (ja) * | 2013-09-27 | 2015-04-13 | リンテック株式会社 | アンテナ、情報通信端末及び近距離無線通信方法 |
WO2015146298A1 (ja) * | 2014-03-28 | 2015-10-01 | デクセリアルズ株式会社 | アンテナ装置、電子機器及びアンテナ装置のインダクタンス調整方法 |
CN106164928A (zh) * | 2014-03-31 | 2016-11-23 | 佐藤控股株式会社 | Ic标签发行装置以及屏蔽板 |
GB2539839B (en) * | 2014-04-28 | 2021-03-10 | Murata Manufacturing Co | Wireless IC device, clip-shaped RFID tag, and article having RFID tag |
JPWO2018123432A1 (ja) * | 2016-12-30 | 2019-10-31 | 株式会社フェニックスソリューション | ブースターアンテナ、ブースターアンテナ搭載形の通信用icユニット、及び導体付きブースターアンテナ搭載形の通信用icユニット |
WO2019035396A1 (ja) * | 2017-08-18 | 2019-02-21 | 株式会社フェニックスソリューション | Rfタグおよびrfタグ装置 |
JPWO2019035396A1 (ja) * | 2017-08-18 | 2020-10-01 | 株式会社フェニックスソリューション | Rfタグおよびrfタグ装置 |
JP7133228B2 (ja) | 2017-08-18 | 2022-09-08 | 株式会社フェニックスソリューション | Rfタグおよびrfタグ装置 |
Also Published As
Publication number | Publication date |
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JPWO2013011865A1 (ja) | 2015-02-23 |
US20140292586A1 (en) | 2014-10-02 |
CN203850432U (zh) | 2014-09-24 |
US9016592B2 (en) | 2015-04-28 |
JP2014168308A (ja) | 2014-09-11 |
US8814056B2 (en) | 2014-08-26 |
CN204189963U (zh) | 2015-03-04 |
JP5660217B2 (ja) | 2015-01-28 |
JP5713134B2 (ja) | 2015-05-07 |
US20140027520A1 (en) | 2014-01-30 |
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