WO2018180149A1 - Dispositif d'antenne et instrument électronique - Google Patents

Dispositif d'antenne et instrument électronique Download PDF

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Publication number
WO2018180149A1
WO2018180149A1 PCT/JP2018/007489 JP2018007489W WO2018180149A1 WO 2018180149 A1 WO2018180149 A1 WO 2018180149A1 JP 2018007489 W JP2018007489 W JP 2018007489W WO 2018180149 A1 WO2018180149 A1 WO 2018180149A1
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Prior art keywords
coil
circuit
primary
antenna device
conductive member
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PCT/JP2018/007489
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English (en)
Japanese (ja)
Inventor
市川　敬一
末定　剛
貴文 那須
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株式会社村田製作所
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Application filed by 株式会社村田製作所 filed Critical 株式会社村田製作所
Priority to JP2018547484A priority Critical patent/JP6428989B1/ja
Publication of WO2018180149A1 publication Critical patent/WO2018180149A1/fr

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    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06K—GRAPHICAL DATA READING; PRESENTATION OF DATA; RECORD CARRIERS; HANDLING RECORD CARRIERS
    • G06K7/00—Methods or arrangements for sensing record carriers, e.g. for reading patterns
    • G06K7/10—Methods or arrangements for sensing record carriers, e.g. for reading patterns by electromagnetic radiation, e.g. optical sensing; by corpuscular radiation
    • 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
    • H04B5/48—

Definitions

  • the present invention relates to an antenna device used in near field communication and an electronic apparatus including the antenna device.
  • an antenna device used for an HF band RFID system such as NFC (Near Field Communication) is incorporated.
  • a low inductance part such as a part of a metal casing may be used as a part of a loop antenna.
  • Patent Document 1 discloses an antenna device in which a feeding coil is magnetically coupled to the loop antenna and a feeding circuit is connected to the feeding coil.
  • the loop antenna having a magnetic coupling element such as a transformer in part as a power supply by magnetic field coupling to the entire loop antenna as shown in Patent Document 1 via the magnetic coupling of the magnetic coupling element.
  • a magnetic coupling element such as a transformer in part as a power supply by magnetic field coupling to the entire loop antenna as shown in Patent Document 1
  • a resonant loop in which the radiating element portion and the magnetic coupling element are connected in series is formed. Therefore, a large current also flows through the magnetic coupling element, and there is a problem that it is difficult to downsize the magnetic coupling element from the viewpoint of heat dissipation.
  • an object of the present invention is to provide an antenna device and an electronic device including the antenna device that are intended to simplify a circuit configuration, reduce an occupied area, and improve communication characteristics.
  • the antenna device of the present invention is an antenna device used in near-field communication, and is connected to a communication circuit having a reader / writer function, a primary circuit having a primary coil, a conductive member, and a secondary A secondary circuit having a coil and a secondary capacitor.
  • the primary coil and the secondary coil are magnetically coupled, and the conductive member, the secondary coil, and the secondary capacitor are connected in parallel to each other and have two branch points.
  • the reactance of the current path through the secondary coil is inductive, and the inductance of the secondary coil is larger than the inductance of the conductive member, and the inductance of the conductive member and the secondary side
  • the capacitor constitutes a secondary side resonance circuit. And it couple
  • the conductive member having a low inductance can be matched with the communication circuit with a simple configuration, the conductive member can be effectively used as a magnetically coupled antenna, and the antenna structure can be simplified. Moreover, the current flowing through the conductive member can be increased, and high communication characteristics can be obtained.
  • the primary side circuit further includes a primary side capacitor, and the primary side capacitor is connected in series to the primary coil, and the primary coil and the primary side capacitor constitute a primary side resonance circuit. It is preferable to do.
  • the filter circuit for EMI countermeasures provided between the communication circuit and the primary coil can be simplified, and the number of parts constituting the matching circuit can be reduced, so that it can be easily incorporated into the device.
  • the center frequency of the communication frequency band of the near field communication may be between two resonance frequencies generated by a coupled resonance circuit configured by coupling a primary side resonance circuit and a secondary side resonance circuit. preferable.
  • the antenna device further includes a housing having a housing conductor portion, and a part or all of the conductive member is the housing conductor portion.
  • the antenna device in a state of being incorporated in the electronic base device can be reduced in size.
  • the antenna device further includes a multilayer chip component, and the primary coil and the secondary coil are formed integrally with the multilayer chip component, and the multilayer chip component preferably has a magnetic layer.
  • the primary coil and the secondary coil can be reduced in size, and a small antenna device can be configured. Further, the primary coil and the secondary coil can be stably coupled with a high coupling coefficient, and an antenna device with stable characteristics can be configured.
  • the primary circuit further includes an inductor that blocks high-frequency noise.
  • the electronic device of the present invention includes an antenna device used in near-field communication and a housing having a housing conductor, and the antenna device is A primary circuit having a primary coil connected to a communication circuit having a reader / writer function, and a secondary circuit having a conductive member, a secondary coil, and a secondary capacitor are provided.
  • the primary coil and the secondary coil are magnetically coupled, and the conductive member, the two coils, and the secondary capacitor are connected in parallel to each other and have two branch points.
  • the reactance of the current path through the secondary coil is inductive, and the inductance of the secondary coil is larger than the inductance of the conductive member, and the inductance of the conductive member and the secondary side
  • the capacitor constitutes a secondary side resonance circuit. And it is characterized in that it is magnetically coupled with a communication partner by a magnetic field generated by a current flowing through the conductive member.
  • an electronic device having a small-sized antenna device for near-field communication with high communication characteristics is configured.
  • an antenna device and an electronic device equipped with the antenna device with a simplified circuit configuration, a reduced occupied area, and improved communication characteristics.
  • FIG. 1 is a circuit diagram of an antenna device 101A according to the first embodiment.
  • FIG. 2 is a circuit diagram of another antenna device 101B according to the first embodiment.
  • FIG. 3 is an external perspective view of the magnetic coupling element 3.
  • FIG. 4 is an enlarged view of a portion where the primary coil L1 and the secondary coil L2 are formed inside the magnetic coupling element 3.
  • FIG. 5 is a cross-sectional view of the magnetic coupling element 3.
  • FIG. 6 is a circuit diagram of an antenna device 102A according to the second embodiment.
  • FIG. 7 is a circuit diagram of another antenna device 102B according to the second embodiment.
  • Figure 8 is a graph showing the frequency characteristic of the current i A flowing through the current i1 and the conductive member 20 flowing through the primary coil L1.
  • FIG. 1 is a circuit diagram of an antenna device 101A according to the first embodiment.
  • FIG. 2 is a circuit diagram of another antenna device 101B according to the first embodiment.
  • FIG. 3 is an external perspective view of the
  • FIG. 9 is a schematic cross-sectional view of an antenna device provided in an electronic apparatus according to the third embodiment.
  • FIG. 10 is a perspective view showing the shape of the metal parts 20F and 21F of the housing.
  • FIG. 11 is a perspective view illustrating an example of a housing metal part having a shape different from that of the metal part of the housing illustrated in FIG. 10.
  • 12 is a perspective view showing an example of a housing metal part having a shape different from that of the metal part of the housing shown in FIG.
  • FIG. 13 is a plan view of an antenna device 104A provided in an electronic apparatus according to the fourth embodiment.
  • FIG. 14 is a plan view of an antenna device 104B provided in another electronic apparatus according to the fourth embodiment.
  • FIG. 15 is a circuit diagram of the magnetic coupling element according to the fifth embodiment.
  • FIG. 16 is a circuit diagram of another magnetic coupling element according to the fifth embodiment. 17 is a cross-sectional view of the magnetic coupling element shown in FIG.
  • FIG. 18 is a circuit diagram of the antenna device 106 according to the sixth embodiment.
  • FIG. 19 is a circuit diagram of the antenna device 107 of the seventh embodiment.
  • FIG. 20 is a circuit diagram of the antenna device 108 of the eighth embodiment.
  • the “antenna device” is an antenna that radiates magnetic flux.
  • the antenna device is an antenna used for near-field communication using magnetic field coupling with an antenna on the communication partner side, and is used for communication such as NFC (Near field communication).
  • the antenna device is used in the HF band, for example, and is used particularly at a frequency near 13.56 MHz or 13.56 MHz. Since the size of the antenna device is sufficiently smaller than the wavelength ⁇ at the used frequency, the electromagnetic wave radiation characteristics are poor in the used frequency band.
  • the length of the coil conductor when the coil conductor of the coil antenna provided in the antenna device described later is extended is ⁇ / 10 or less.
  • the “wavelength” here is an effective wavelength considering the wavelength shortening effect due to the dielectric property and permeability of the substrate on which the antenna is formed.
  • Both ends of the coil conductor of the coil antenna are connected to a power feeding circuit that operates the used frequency band (HF band, particularly around 13.56 MHz). Therefore, the coil conductor has a substantially uniform current flowing along the coil conductor, that is, in the direction in which the current flows, and the length of the coil conductor is equal to or greater than the wavelength. Current distribution along the line is unlikely to occur.
  • HF band used frequency band
  • FIG. 1 is a circuit diagram of an antenna device 101A according to the first embodiment.
  • This antenna device 101A is an antenna device used in near-field communication, and is used, for example, as a reader / writer in an RFID system that performs NFC communication. Alternatively, it is used for an electronic device having a reader / writer function.
  • the antenna device 101A includes a primary side circuit 1 and a secondary side circuit 2 connected to the transceiver IC9.
  • the transceiver IC 9 has a reader / writer control function.
  • the primary circuit 1 has a primary coil L1.
  • the secondary side circuit 2 includes a conductive member 20, a secondary coil L2, and a secondary side capacitor C2.
  • an inductor L20 represents the inductance by the conductive member 20 as a circuit element.
  • This conductive member is, for example, a housing conductor part of an electronic device that is substantially a one-turn loop antenna.
  • the transceiver IC 9 is an example of the “communication circuit” according to the present invention.
  • the primary coil L1 and the secondary coil L2 are magnetically coupled to each other. That is, the magnetic coupling element (transformer) 3 is comprised by the primary coil L1 and the secondary coil L2.
  • the conductive member 20, the secondary coil L2, and the secondary capacitor C2 are connected in parallel to each other and have two branch points.
  • the inductance of the conductive member 20 and the secondary side capacitor C2 constitute a secondary side resonance circuit RC2.
  • the reactance of the current path CP of the secondary coil L2 is inductive when viewed from the two branch points (connection points) CN1 and CN2 of the parallel connection.
  • connection points connection points
  • FIG. 1 only the coil L2 is inserted into the current path CP, which is inductive.
  • the inductive reactance of the circuit when the secondary coil L2 is viewed from the branch points CN1 and CN2 is represented by ⁇ L, and the capacitive reactance is represented by 1 / ⁇ C.
  • Inductivity is in a relationship of ⁇ L> 1 / ⁇ C.
  • the inductance of the secondary coil L2 is larger than the inductance of the conductive member 20. That represents the inductance of the secondary coil L2 by L2, to represent the inductance of the antenna loop of the conductive member 20 in L A, L2> is L A, that is, the relationship of L A / L2 ⁇ 1.
  • the inductor L20 by the conductive member 20 and the secondary side capacitor C2 are connected in parallel to the secondary coil L2, and the secondary by the inductor L20 by the conductive member 20 and the secondary side capacitor C2.
  • a side resonance circuit RC2 is configured. The operation of the secondary side resonance circuit RC2 is as follows.
  • the inductance of the secondary coil L2 is larger than that of the inductor L20 made of the conductive member 20, a current easily flows from the secondary coil L2 to the inductor L20. Therefore, the current i A flowing through the secondary side resonance circuit RC2 is larger than the current i2 flowing through the secondary coil L2.
  • the current i A flowing through the secondary side resonance circuit RC2 is a resonance current, it can be a large current according to the Q value of the secondary side resonance circuit RC2, as will be described later. Furthermore, by increasing the Q value of the secondary side resonance circuit RC2 (for example, setting the Q value to 5 or more), energy consumption in the secondary side resonance circuit RC2 can be suppressed.
  • the impedance characteristic (for example, resonance frequency) near the drive frequency of the secondary side resonance circuit RC2 can be determined mainly by the characteristics of the conductive member 20 and the secondary side capacitor C2.
  • the drive frequency ⁇ is set close to the resonance frequency ⁇ A of the antenna loop and the secondary capacitor C2, so if the first term of the denominator is ignored as ⁇ A , the current amplification factor is expressed by the following equation.
  • the current flowing through the conductive member 20 is amplified by about Q A times the current flowing through the secondary coil L2.
  • the coupling coefficient k between the primary coil L1 and the secondary coil L2 is less than 1, and more preferably 0.4 or more and 0.9 or less.
  • the leakage inductance of the magnetic coupling element 3 is necessary.
  • the self-inductance of the secondary coil L2 is 5 ⁇ H, for example, and the self-inductance of the primary coil L1 is 2 ⁇ H, for example.
  • Current flowing through the secondary side resonance circuit RC2 is diverted in accordance with the inverse ratio of the inductance L A of the self-inductance and the conductive member 20 of the secondary coil L2.
  • the self-inductance of the secondary coil L2 is preferably an inductance L A example sufficiently larger than 0.05 ⁇ H the conductive member 20 (at least 5 times or more).
  • the increasing the self-inductance of the secondary coil L2 since the possible to reduce the size of the magnetic coupling element 3 is a relation of trade-off, for example, it is kept at about 5 ⁇ H 100 times the L A preferable.
  • the self inductance of the primary coil L1 is made smaller than the self inductance of the secondary coil L2.
  • the self-inductance of the secondary coil L2 is 5 ⁇ H, for example, and the self-inductance of the primary coil L1 is 2 ⁇ H, for example. This allows the necessary current to be drawn from the transceiver IC9.
  • the magnitude relationship between L1 and L2 may change depending on the specifications of the transceiver IC.
  • FIG. 2 is a circuit diagram of another antenna device 101B according to the first embodiment.
  • the configuration of the secondary circuit 2 is different from the antenna device 101A shown in FIG.
  • the primary side circuit 1 is the same as the primary side circuit 1 of the antenna device 101A, in FIG. 2, the transceiver IC is represented as a high frequency voltage source 9E.
  • the parasitic capacitance Cs generated in the secondary coil L2 is illustrated.
  • the capacitor C21 is provided in the current path CP of the secondary coil L2.
  • the reactance of the current path CP is set to be inductive.
  • the magnetic coupling element 3 is comprised by the primary coil L1 and the secondary coil L2. Further, a ⁇ -type capacitive coupling circuit 4 is configured by the parasitic capacitance Cs, the capacitor C21, and the secondary side capacitor C2.
  • the parasitic capacitance Cs may increase due to the structure of the secondary coil L2.
  • the conductors come close to each other and the parasitic capacitance increases, and the influence of the parasitic capacitance cannot be ignored.
  • the resonance frequency characteristic of the secondary side resonance circuit RC2 becomes steep or the loss increases due to the influence of the parasitic capacitance Cs. There is a case to do. This is because the capacitive coupling circuit 4 is configured.
  • the reactance of the current path CP of the secondary coil L2 is made inductive by increasing the capacitance of the series capacitor C21, the influence of the parasitic capacitance can be reduced, and the secondary resonance circuit RC2 and the magnetic coupling element 3 (2 The coupling with the secondary coil L2) can be enhanced.
  • FIG. 3 is an external perspective view of the magnetic coupling element 3.
  • FIG. 4 is an enlarged view of a portion where the primary coil L1 and the secondary coil L2 in the magnetic coupling element 3 are formed, and is particularly shown extended in the stacking direction.
  • FIG. 5 is a cross-sectional view of the magnetic coupling element 3.
  • the magnetic coupling element 3 is a rectangular parallelepiped laminated chip component, and a terminal on which both ends of the primary coil L1 are conductive and a terminal on which both ends of the secondary coil L2 are conductive are formed on the bottom surface.
  • the magnetic coupling element 3 is surface-mounted on a circuit board using these terminals as mounting terminals.
  • the magnetic coupling element 3 is an element in which a primary coil L1 and a secondary coil L2 are integrally formed as a multilayer chip component.
  • the magnetic coupling element 3 has a magnetic layer in order to increase the inductance.
  • the formation layer of the primary coil L1, the secondary coil L2, and the layer between the primary coil L1 and the secondary coil L2 are magnetic ferrite layers, and the other layers are nonmagnetic ferrite layers.
  • the structure which does not form a nonmagnetic layer may be sufficient.
  • the loop pattern or a partial pattern thereof is a coil conductor pattern, and the pattern extending in the vertical direction is an interlayer connection conductor.
  • the primary coil L1 includes a plurality of primary coil conductor patterns L11, L12, L13, L14, L15, and L16 and interlayer connection conductors that connect these layers.
  • the secondary coil L2 includes a plurality of secondary coil conductor patterns L21, L22, L23, and L24, and interlayer connection conductors that connect these layers.
  • the primary coil L1 is a helical coil having about 5 turns
  • the secondary coil L2 is a helical coil having about 4 turns.
  • the primary coil L1 and the secondary coil L2 are laminated close to each other, and the coil openings of the primary coil L1 and the secondary coil L2 are overlapped, and the primary coil L1 is wound.
  • the rotation axis and the winding axis of the secondary coil L2 are in a coaxial relationship.
  • FIG. 6 is a circuit diagram of an antenna device 102A according to the second embodiment.
  • FIG. 7 is a circuit diagram of another antenna device 102B according to the second embodiment. In either case, the configuration of the primary circuit 1 is different from the example shown in FIG.
  • the antenna device 102A shown in FIG. 6 includes a primary side circuit 1 and a secondary side circuit 2 connected to the transceiver IC9.
  • the transceiver IC 9 has a transmission signal output port Tx and a reception signal input port Rx.
  • the primary side circuit 1 has a primary coil L1, primary side capacitors C11 and C12, and inductors Lf1 and Lf2.
  • a primary side resonance circuit RC1 is configured by the primary coil L1, the inductors Lf1 and Lf2, and the primary side capacitors C11 and C12.
  • the impedance viewed from the transceiver IC9 can be set to a predetermined impedance (for example, an impedance of 20 ⁇ to 80 ⁇ or less), and thereby impedance matching between the transceiver IC9 and the antenna Can be planned.
  • a predetermined impedance for example, an impedance of 20 ⁇ to 80 ⁇ or less
  • the primary side circuit 1 has a primary coil L1 and a primary side capacitor C10.
  • a primary side resonance circuit RC1 is configured by the primary coil L1 and the primary side capacitor C10.
  • Other configurations are the same as those of the antenna device shown in FIG. 6 or FIG.
  • the transmission signal output port Tx of the transceiver IC 9 is a balanced circuit, one end of the primary coil L1 may be connected to the ground conductor in the case of an unbalanced circuit.
  • the primary side resonance circuit RC1 and the secondary side resonance circuit RC2 are coupled to form one coupled resonance circuit.
  • the communication frequency of near-field communication is between two resonance frequencies generated by this coupled resonance circuit.
  • the inductors Lf1 and Lf2 block high frequency noise including harmonic components of the normal mode voltage and the common mode voltage superimposed on the two Tx ports of the transceiver IC9. These inductors are basically unnecessary, but may be added as necessary when further reduction of high frequency noise is desired. Usually, it is set to a value smaller than the inductance of the primary coil L1.
  • FIG. 8 is a diagram showing frequency characteristics of the current i1 flowing through the primary coil L1 and the current iA flowing through the conductive member 20. Both show bimodality having peaks at frequencies f1 and f2.
  • the two peak frequencies f1 and f2 are resonance frequencies of a coupled resonance circuit generated by coupling the primary side resonance circuit RC1 and the secondary side resonance circuit RC2.
  • the resonance frequencies of the primary side resonance circuit RC1 and the secondary side resonance circuit RC2 are substantially equal to the communication frequency hop, but when they are coupled, the two peak frequencies are separated according to the coupling coefficient. Since the bimodality is not shown when the coupling coefficient is 1, the coupling coefficient k is set to 0.4 or more and 0.9 or less, for example, as described above.
  • the coupled resonant circuit configured by coupling the primary side resonant circuit RC1 and the secondary side resonant circuit RC2 exhibits bandpass characteristics.
  • the high frequency noise component generated in the transceiver IC 9 is attenuated when passing through the coupled resonance circuit, and is not easily radiated from the conductive member functioning as an antenna. That is, since the coupled resonant circuit exhibits filter characteristics, the filter circuit for EMI countermeasures provided between the transceiver IC 9 and the magnetic coupling element 3 can be simplified, and the number of parts of the matching circuit can be reduced, so that it can be easily incorporated into equipment. .
  • FIG. 9 is a schematic cross-sectional view of an antenna device provided in an electronic device.
  • the housing includes metal parts 20F and 21F.
  • the metal portion 20F corresponds to a “conductive member” according to the present invention.
  • FIG. 10 is a perspective view showing the shapes of the metal portions 20F and 21F of the casing.
  • the metal part 20F is located at one end of a smartphone, for example.
  • the transceiver IC 9, the primary side capacitors C11 and C12, the magnetic coupling element 3, and the secondary side capacitor C2 are formed on the circuit board 5, and the circuit board 5 is accommodated in the housing.
  • One end of the secondary capacitor C2 is connected to the circuit ground, and the other end is connected to a part of the metal portion 20F of the housing via a pin terminal (probe pin) or the like.
  • the other part of the metal part 20F is connected to the ground conductor of the circuit board 5 via another pin terminal (probe pin) or the like.
  • FIG. 11 and FIG. 12 are perspective views showing examples of a case metal part having a shape different from the metal part of the case shown in FIG.
  • the housing metal part 20 ⁇ / b> F is not formed as a flat plate but is formed and connected to both ends in the X-axis direction and one end in the Y-axis direction in FIG. 11.
  • the housing metal part 20 ⁇ / b> F is a U-shaped (U-shaped) conductor as viewed from the Y direction.
  • the metal case 20F can be used as a part of the loop antenna.
  • FIG. 13 is a plan view of the antenna device 104A provided in the electronic apparatus.
  • This antenna device 104A includes a loop conductor 20L.
  • the loop conductor 20L corresponds to a “conductive member” according to the present invention.
  • FIG. 14 is a plan view of the antenna device 104B provided in the electronic apparatus.
  • This antenna device 104B includes loop conductors 20L1 and 20L2.
  • the loop conductors 20L1 and 20L2 correspond to “conductive members” according to the present invention.
  • the loop conductors 20L, 20L1, and 20L2 are conductor patterns formed on, for example, a circuit board or a casing. As described above, the conductor formed with a pattern may be used as the “conductive member”.
  • each of these loop conductors 20L1 and 20L2 can act as a loop antenna. This improves the degree of freedom of the communication range.
  • the two loop conductors 20L1 and 20L2 are arranged on the same surface, but the two loop conductors may be formed on the front and back of the substrate.
  • Two loop conductors may be arranged three-dimensionally.
  • one loop conductor may be formed on the front surface or the back surface of the housing or the substrate, and the other loop conductor may be formed on the side surface of the housing or the substrate.
  • the two loop conductors 20L1 and 20L2 are connected in parallel, but they may be connected in series. Three or more loop conductors may be provided.
  • FIG. 15 is a circuit diagram of the magnetic coupling element of the fifth embodiment.
  • the midpoint of the primary coil L1 is connected to the ground. According to this configuration, high-frequency noise (particularly common mode noise component) generated with the switching operation of the transceiver IC is reduced. Note that the output circuit of the transceiver IC is assumed to be a balanced circuit.
  • FIG. 16 is a circuit diagram of another magnetic coupling element according to the fifth embodiment.
  • FIG. 17 is a cross-sectional view of this magnetic coupling element.
  • the primary coil L1 and the secondary coil L2 are helical conductor patterns formed in a laminated body of magnetic ferrite, like the magnetic coupling elements shown in FIGS. Between the formation layer of the primary coil L1 and the formation layer of the secondary coil L2, the layer of the shield conductor SC which shields between those conductor patterns is provided.
  • a ground terminal TG is formed on the lower surface (mounting surface) of the laminate, and the shield conductor SC is a ground terminal. Connected to TG.
  • FIG. 18 is a circuit diagram of the antenna device 106 of the sixth embodiment.
  • the transceiver IC 9 connected to the antenna device 106 has two Rx terminals for differentially receiving received signals. Both ends of the primary coil L1 are connected to the two Rx terminals.
  • the received signal is differentially input from the primary coil L1 to the transceiver IC9, it is less susceptible to common mode noise and increases the SNR (signal-to-noise ratio) of the received signal. It is done.
  • FIG. 19 is a circuit diagram of the antenna device 107 of the seventh embodiment.
  • the transceiver IC 9 connected to the antenna device 107 has a terminal for outputting a control signal for adjusting the resonance frequency of the secondary side resonance circuit RC2.
  • the secondary side resonance circuit RC2 includes an inductor L20, a secondary side capacitor C2, and a variable capacitance element C20.
  • variable capacitance element C20 The capacitance of the variable capacitance element C20 is determined according to the control signal given from the transceiver IC9.
  • the variable capacitance element C20 includes a DA converter circuit including a resistance circuit that converts a control signal of a plurality of bits into an analog voltage signal, and a ferroelectric capacitor to which the analog voltage is applied.
  • the resonance frequency of the secondary side resonance circuit RC2 is actively optimized even if there is a variation in the capacitance of the secondary side capacitor C2 or a change in the resonance frequency characteristics due to the proximity of the metal to the antenna device. It becomes. Therefore, a decrease in communication distance can be suppressed.
  • FIG. 20 is a circuit diagram of the antenna device 108 of the eighth embodiment.
  • the transceiver IC 9 connected to the antenna device 108 is a single-ended transceiver IC.
  • the magnetic coupling element 3 is an autotransformer type element and includes a primary coil L1 and secondary coils L21 and L22. However, the primary coil L1 and the secondary coil L21 are the same coil.
  • the primary side circuit 1 has a primary coil L1 and a primary side capacitor C10.
  • a primary side resonance circuit is configured by the primary coil L1 and the primary side capacitor C10.
  • the inductor Lf blocks high frequency noise including harmonic components superimposed on the Tx port of the transceiver IC9.
  • the secondary circuit 2 includes a conductive member 20, secondary coils (L21, L22), and a secondary capacitor C2.
  • the magnetic coupling element 3 may be an autotransformer element.
  • the insulation type transformer structure shown so far may be used.
  • the communication antenna device has been mainly described.
  • the antenna device of the present invention is mixedly mounted on an electronic device including a circuit used in a wireless power transmission system that uses a lower frequency band than NFC. May be.
  • the NFC circuit (transceiver IC 9 or the like) can be used even when the antenna device receives a high-frequency magnetic field (eg, 6.78 MHz) of the wireless power transmission system. Destruction can be prevented.
  • the magnetic coupling element having the transformer structure in which the coil pattern is formed in the laminated body is shown.
  • the magnetic coupling element of the present invention is not limited to this, and a winding type transformer may be used. Good.
  • all the layers of the laminate constituting the magnetic coupling element may be magnetic layers, or all the layers may be nonmagnetic layers.
  • the reception signal is input to the transceiver IC 9 from the secondary side of the magnetic coupling element 3.
  • an impedance matching circuit such as a resistor or a capacitor
  • the casing metal portion 20F may have any shape as long as it is a metal portion constituting the casing, such as the shape shown in FIGS. Is not limited to). Moreover, it is not necessary to be a single member, and it may be a metal part of a housing constituted by a plurality of members.
  • the antenna device and the electronic device in the communication system mainly using magnetic field coupling such as NFC have been described.
  • the antenna device and the electronic device in the above-described embodiment are contactless using magnetic field coupling.
  • the present invention can be similarly applied to a power transmission system (electromagnetic induction method, magnetic field resonance method).
  • the antenna device in the above-described embodiment is used as a power receiving antenna device of a power receiving device of a magnetic resonance type non-contact power transmission system used in the HF band, particularly in the vicinity of 6.78 MHz or 6.78 MHz. It can be applied as an antenna device.
  • both ends of the coil conductor included in the coil antenna of the antenna device are connected to a power reception circuit or a power transmission circuit that operates a used frequency band (HF band, particularly around 6.78 MHz).
  • the antenna device functions as a power receiving antenna device or a power transmitting antenna device.
  • the power receiving circuit includes, for example, a matching circuit, a smoothing circuit, a DC / DC converter, and the like to supply power from the power receiving coil antenna to a load (secondary battery, etc.). These circuits are connected to the power receiving coil antenna. Cascaded between load.
  • the power transmission circuit includes a rectifier circuit, a smoothing circuit, a switch circuit that functions as a DC / AC inverter, and the like for supplying power from the commercial power source to the power transmission coil antenna. Are connected in cascade.

Abstract

L'invention concerne un dispositif d'antenne (101A) qui comprend : un circuit côté primaire (1) qui est connecté à un émetteur-récepteur (IC9) ayant une fonction de lecture/écriture, et possède une bobine primaire (L1) ; et un circuit côté secondaire (2) qui comprend un élément électroconducteur (20), une bobine secondaire et un condensateur côté secondaire (C2). Un couplage de champ magnétique est réalisé pour la bobine primaire (L1) et la bobine secondaire (L2). Chacun de l'élément électroconducteur (20), de la bobine secondaire (L2) et du condensateur côté secondaire (C2) est connecté en parallèle, et, comme vu depuis de deux points de ramification (CN1, CN2) de la connexion parallèle, la réactance d'un trajet de courant (CP) passant à travers la bobine secondaire (L2) est inductive, et l'inductance de la bobine secondaire (L2) est supérieure à l'inductance de l'élément électroconducteur (20). L'inductance de l'élément électroconducteur (20) et du condensateur côté secondaire (C2) constituent un circuit de résonance côté secondaire (RC2).
PCT/JP2018/007489 2017-03-29 2018-02-28 Dispositif d'antenne et instrument électronique WO2018180149A1 (fr)

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Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2000027137A1 (fr) * 1998-11-04 2000-05-11 Checkpoint Systems, Inc. Etiquette d'identification a radiofrequence (rfid) a circuit resonant parallele pour le decouplage magnetique entre une etiquette et son environnement
EP1760629A2 (fr) * 2005-09-05 2007-03-07 Sony Ericsson Mobile Communications Japan, Inc. Lecteur /scripteur et son procédé de communication
JP2009171070A (ja) * 2008-01-11 2009-07-30 Sony Corp アンテナモジュール、通信装置及び通信システム
JP2011228841A (ja) * 2010-04-16 2011-11-10 Tokai Rika Co Ltd 無線認証システム
WO2014003163A1 (fr) * 2012-06-28 2014-01-03 株式会社村田製作所 Dispositif d'antenne et dispositif de terminal de communication
WO2017006921A1 (fr) * 2015-07-06 2017-01-12 株式会社村田製作所 Appareil d'antenne et dispositif électronique

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2000027137A1 (fr) * 1998-11-04 2000-05-11 Checkpoint Systems, Inc. Etiquette d'identification a radiofrequence (rfid) a circuit resonant parallele pour le decouplage magnetique entre une etiquette et son environnement
EP1760629A2 (fr) * 2005-09-05 2007-03-07 Sony Ericsson Mobile Communications Japan, Inc. Lecteur /scripteur et son procédé de communication
JP2009171070A (ja) * 2008-01-11 2009-07-30 Sony Corp アンテナモジュール、通信装置及び通信システム
JP2011228841A (ja) * 2010-04-16 2011-11-10 Tokai Rika Co Ltd 無線認証システム
WO2014003163A1 (fr) * 2012-06-28 2014-01-03 株式会社村田製作所 Dispositif d'antenne et dispositif de terminal de communication
WO2017006921A1 (fr) * 2015-07-06 2017-01-12 株式会社村田製作所 Appareil d'antenne et dispositif électronique

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