WO2021157244A1 - アンテナ装置及び電子機器 - Google Patents

アンテナ装置及び電子機器 Download PDF

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Publication number
WO2021157244A1
WO2021157244A1 PCT/JP2020/048326 JP2020048326W WO2021157244A1 WO 2021157244 A1 WO2021157244 A1 WO 2021157244A1 JP 2020048326 W JP2020048326 W JP 2020048326W WO 2021157244 A1 WO2021157244 A1 WO 2021157244A1
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Prior art keywords
circuit
conductor portion
antenna device
matching circuit
conductor
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Application number
PCT/JP2020/048326
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English (en)
French (fr)
Japanese (ja)
Inventor
冬夢 田邊
貴文 那須
石塚　健一
Original Assignee
株式会社村田製作所
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
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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 CN202090000932.5U priority Critical patent/CN217334385U/zh
Priority to JP2021575657A priority patent/JP7211543B2/ja
Publication of WO2021157244A1 publication Critical patent/WO2021157244A1/ja

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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
    • H01Q1/24—Supports; Mounting means by structural association with other equipment or articles with receiving set
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q1/00—Details of, or arrangements associated with, antennas
    • H01Q1/50—Structural association of antennas with earthing switches, lead-in devices or lightning protectors
    • 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
    • H01Q9/06—Details
    • H01Q9/14—Length of element or elements adjustable
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
    • H03H7/00—Multiple-port networks comprising only passive electrical elements as network components
    • H03H7/38—Impedance-matching networks

Definitions

  • the present invention relates to an antenna device provided in an electronic device, and more particularly to an antenna device including a radiating element having a loop portion of a conductor and an electronic device including the antenna device.
  • a part of the housing may be used as a part of the radiation element of the antenna device.
  • an antenna device that can be used over a wide band is required in order to make it applicable to a communication frequency band from several hundred MHz to several GHz, for example.
  • Patent Document 1 shows a transformer-type matching circuit suitable for impedance matching between such a feeding circuit and a radiating element and capable of performing predetermined impedance conversion over a wide band.
  • FIG. 42 is a schematic configuration diagram of a loop antenna configured on a circuit board.
  • the circuit board has a ground region GND in which a ground conductor is formed and a non-ground region NGA in which a ground conductor is not formed, and a loop conductor pattern PL is formed in this non-ground region NGA.
  • the circuit board is provided with a power supply circuit FS connected to the loop conductor pattern PL.
  • the loop antenna itself has an inductance property (hereinafter referred to as "L property") due to its structure. Due to its large size, the impedance conversion effect of the transformer type matching circuit is limited. That is, there arises a problem to be solved that the frequency band in which a predetermined impedance conversion ratio can be obtained is narrowed. The detailed action will be described later.
  • the above-mentioned problems are not limited to the antenna device constituting a typical loop antenna and the electronic device provided with the antenna device, and include the antenna device having a loop portion forming a loop from the feeding portion to the grounding portion as a radiating element and the antenna device thereof.
  • the present invention has been made in view of the above-mentioned circumstances, and an object of the present invention is to provide an antenna device having a wideband characteristic while having a radiating element having a loop portion, and an electric device provided with the antenna device. be.
  • An antenna device as an example of the present disclosure is an antenna device composed of an electronic device including a housing having a conductive frame and a first power feeding circuit and a circuit board housed in the housing. It includes an impedance matching circuit that is connected between the first feeding element, the first feeding circuit, and the first radiating element, and that matches the impedance of the first feeding circuit and the first radiating element.
  • the impedance matching circuit has a transformer type matching circuit including a first coil and a second coil that are magnetically coupled to each other, the circuit board has a ground conductor, and the frame has a first conductor portion and a second conductor portion.
  • the first radiating element includes the first conductor portion and the ground conductor, the second conductor portion conducts to the ground conductor, and the first conductor portion has a first end and a second end.
  • a loop is formed by the first power feeding circuit, the impedance matching circuit, the first conductor portion, and the ground conductor, and a capacitance portion is formed between the second end and the second conductor portion.
  • An electronic device as an example of the present disclosure includes a radiation element, a power supply circuit, a circuit board, an impedance matching circuit connected between the radiation element and the power supply circuit, the radiation element, the impedance matching circuit, and the like.
  • An electronic device including a housing including the power feeding circuit, wherein the impedance matching circuit has a transformer type matching circuit composed of a first coil and a second coil that are magnetically coupled to each other.
  • the body has a conductive frame, the circuit board has a ground conductor, the frame has a first conductor portion and a second conductor portion, and the radiating element has the first conductor portion and the ground conductor.
  • the second conductor portion conducts to the ground conductor
  • the first conductor portion has a first end and a second end
  • the power feeding circuit, the impedance matching circuit, the first conductor portion and the ground conductor are included.
  • a loop is formed by the above, the power feeding circuit is connected to the first conductor portion via the impedance matching circuit, the second end is close to the second conductor portion, and the second end and the second end are located.
  • a capacitance portion is formed between the conductor portion and the conductor portion.
  • the electronic device as an example of the present disclosure includes a first radiating element, a feeding circuit, a circuit board, an impedance matching circuit connected between the first radiating element and the feeding circuit, and the first.
  • the circuit board has a matching circuit
  • the circuit board has a ground conductor
  • the frame has a first conductor part and a second conductor part
  • the first radiating element includes the first conductor part and the ground conductor.
  • the second conductor portion conducts to the ground conductor, the first conductor portion has a first end and a second end, and is looped by the power feeding circuit, the impedance matching circuit, the first conductor portion, and the ground conductor.
  • the power feeding circuit is connected to the first conductor portion via the impedance matching circuit, the second end is close to the second conductor portion, and the second end and the second conductor portion A capacitance portion is formed between the and.
  • the present invention it is possible to obtain an antenna device having a wide band characteristic and an electric device including the antenna device while having an antenna element having a loop portion. Further, since the capacitance portion generated between the second end of the first conductor portion and the second conductor portion is added, the first radiating element required to obtain a predetermined frequency characteristic can be shortened.
  • FIG. 1 is a plan view of the antenna device 101 of the first embodiment and the electronic device 201 including the antenna device 101.
  • FIG. 2 is a cross-sectional view taken along the line YY of the electronic device 201 shown in FIG.
  • FIG. 3 is a plan view of the antenna device 101 portion of the electronic device.
  • FIG. 4 is an equivalent circuit diagram of the antenna device 101.
  • FIG. 5 is a diagram showing an electric field strength distribution in the fundamental wave resonance of the half-wavelength loop antenna.
  • FIG. 6A is a circuit diagram of the transformer type matching circuit 31, and FIG. 6B is an equivalent circuit diagram thereof.
  • FIG. 7A is a circuit diagram of the transformer type matching circuit 31, and FIGS. 7B and 7C are impedance matching circuits as comparative examples.
  • FIG. 8 (A) shows the reflectance coefficient (S11) of the antenna element having a large L property as seen from the feeding circuit
  • FIG. 8 (B) shows the impedance of the antenna as seen from the feeding circuit on the Smith chart.
  • FIG. 9 (A) shows the reflectance coefficient (S11) of the antenna element having a small L property as seen from the feeding circuit
  • FIG. 9 (B) shows the impedance of the antenna as seen from the feeding circuit on the Smith chart.
  • FIG. 10 is a circuit diagram of another transformer type matching circuit 32 according to the first embodiment.
  • FIG. 11 is a plan view of the antenna device 102 portion of the electronic device according to the second embodiment.
  • FIG. 12 is an equivalent circuit diagram of the antenna device 102.
  • FIG. 13 (A) is a plan view of the antenna device 103A portion of the electronic device according to the third embodiment
  • FIG. 13 (B) is a plan view of the antenna device 103B portion of the electronic device according to the third embodiment.
  • FIG. 14 is a diagram schematically showing the operation of the impedance matching circuit 30.
  • FIG. 15A is a diagram showing a configuration of a particular impedance matching circuit of the antenna device according to the third embodiment.
  • FIG. 15B is a diagram showing a configuration of an antenna device in which the input side and the output side of the transformer type matching circuit 31 shown in FIG. 15A are connected in the opposite relationship.
  • 15 (C) is a diagram showing modified examples and specific examples of the matching circuits 41, 42, and 43 in FIGS.
  • FIG. 16 is a diagram showing a configuration of another impedance matching circuit of the antenna device according to the third embodiment.
  • FIG. 17 is a plan view of the antenna device 104 portion of the electronic device according to the fourth embodiment.
  • FIG. 18 is an equivalent circuit diagram of the antenna device 104.
  • FIG. 19 is a plan view of the antenna device 105A portion of the electronic device according to the fifth embodiment.
  • FIG. 20 is a plan view of another antenna device 105B portion of the electronic device according to the fifth embodiment.
  • FIG. 21 is a plan view of the antenna device 106A portion of the electronic device according to the sixth embodiment.
  • FIG. 22 is a plan view of another antenna device 106B portion of the electronic device according to the sixth embodiment.
  • FIG. 23 is a plan view of the antenna device 107 portion of the electronic device according to the seventh embodiment.
  • FIG. 24 is an equivalent circuit diagram of the impedance matching circuit 30 in FIG. 23.
  • FIG. 25 is a diagram showing the frequency characteristics of the insertion loss of the antenna device 107 and the frequency characteristics of the insertion loss of the antenna device of the comparative example.
  • FIG. 26 is a diagram showing the configuration of the antenna device 108 according to the eighth embodiment.
  • FIG. 27 is a plan view of the antenna device 108.
  • FIG. 28 is a plan view of the antenna device 108 and the electronic device 208 including the antenna device 108.
  • FIG. 29 is a diagram showing the frequency characteristics of the reflection coefficient seen from the first feeding circuit 1 and the second feeding circuit 2 of the antenna device 108 according to the eighth embodiment.
  • FIG. 30 is a diagram showing the configuration of the antenna device 109A according to the ninth embodiment.
  • FIG. 31 is a plan view of the antenna device 109A.
  • FIG. 32A is a diagram showing the frequency characteristics of the reflection coefficient seen from the first feeding circuit 1 of the antenna device 109A according to the ninth embodiment.
  • FIG. 32B is a diagram showing the frequency characteristics of the reflection coefficient seen from the first feeding circuit 1 and the second feeding circuit 2 of the antenna device 108 shown in the eighth embodiment as a comparative example.
  • FIG. 33 is a diagram showing the configuration of another antenna device 109B according to the ninth embodiment.
  • FIG. 34 is a plan view of the antenna device 109B.
  • FIG. 35 is a diagram showing the configuration of the antenna device 110A according to the tenth embodiment.
  • FIG. 36 is a diagram showing a configuration of another antenna device 110B according to the tenth embodiment.
  • FIG. 37 is a diagram showing the configuration of yet another antenna device 110C according to the tenth embodiment.
  • FIG. 38 is a diagram showing a switch circuit for selecting a reactance element.
  • FIG. 39 is a plan view showing the structures of the first conductor portion 11 and the second conductor portion 12 of the antenna device according to the eleventh embodiment.
  • FIG. 40A is a plan view of another antenna device according to the eleventh embodiment.
  • FIG. 40 (B) is a cross-sectional view taken along the line YY in FIG. 40 (A).
  • FIG. 41 (A) is a plan view of still another antenna device according to the eleventh embodiment.
  • FIG. 41 (B) is a plan view in a state where the circuit board 20 of FIG. 41 (A) is removed.
  • FIG. 41 (C) is a cross-sectional view taken along the line YY in FIG. 41 (A).
  • FIG. 42 is a schematic configuration diagram of a loop antenna configured on a circuit board.
  • FIG. 1 is a plan view of the antenna device 101 of the first embodiment and the electronic device 201 including the antenna device 101. However, it represents a state in which the upper half of the housing is removed.
  • the electronic device 201 includes a circuit board 20 and a housing 100 that includes the circuit board 20.
  • the housing 100 has a conductive frame 10.
  • the antenna device 101 is composed of a part of the frame 10 and a part of the circuit board 20.
  • the circuit board 20 is configured with a power supply circuit shown later.
  • FIG. 2 is a cross-sectional view of the electronic device 201 shown in FIG. 1 at the YY portion.
  • a ground conductor 20G is formed on the upper surface of the circuit board 20.
  • the ground conductor 20G is electrically connected to the conductor portion of the housing 100.
  • the circuit board 20 is a multilayer board, the internal layer is not shown in FIG.
  • FIG. 3 is a plan view of the antenna device 101 portion of the electronic device. However, for convenience of explanation, it is a plan view in a state where the circuit board 20 and the frame 10 are arranged in the same plane by tilting the frame 10 as shown by the alternate long and short dash line in FIG.
  • the circuit board 20 has a region in which the ground conductor 20G is formed and a non-ground portion 20N in which the ground conductor 20G is not formed.
  • the frame 10 is made of a metal plate.
  • a first conductor portion 11 and a second conductor portion 12 are formed in a part of the frame 10.
  • a capacitance portion CP is formed at positions adjacent to each other of the first conductor portion 11 and the second conductor portion 12.
  • a slit-shaped gap GAP1 is formed between the first conductor portion 11 and the second conductor portion 12, and the capacitance portion CP is formed in this gap GAP1.
  • the second conductor portion 12 is conducting to the ground conductor 20G of the circuit board 20.
  • the first conductor portion 11 has a first end FE and a second end SE, and the second end SE is close to the second conductor portion 12. More specifically, the second end SE is closer to the second conductor portion 12 than the first end FE.
  • the first conductor portion 11 is located at a position facing the non-ground portion 20N of the circuit board 20 and is separated from the ground conductor 20G.
  • the second conductor portion 12 is conductive to the ground conductor 20G of the circuit board 20.
  • the first power feeding circuit 1 is connected to the first conductor portion 11 via an impedance matching circuit by a transformer type matching circuit 31.
  • the first power feeding circuit 1 is connected to the second end SE of the first conductor portion 11 or its vicinity via an impedance matching circuit. More specifically, the position where the first power feeding circuit 1 is connected to the first conductor portion 11 via the impedance matching circuit is closer to the second end SE than the first end FE.
  • a loop is composed of the first feeding circuit 1, the impedance matching circuit by the transformer type matching circuit 31, the first conductor portion 11, and the ground conductor 20G. That is, the antenna element is composed of a part of the frame 10 and the ground conductor 20G of the circuit board 20.
  • FIG. 4 is an equivalent circuit diagram in the vicinity of the fundamental wave resonance frequency corresponding to the portion of the antenna device 101 from the transformer type matching circuit 31 to the ground conductor 20G via the first conductor portion 11.
  • the antenna element of the antenna device 101 is a kind of loop antenna.
  • a loop antenna that can be realized with few slits is suitable because of its design and strength.
  • An inductor component Lant1 is formed between the transformer type matching circuit 31 and the capacitance portion CP generated in the slit-shaped gap GAP1, and the inductance components Lant2, Lant3 and the capacitance component Cm of the antenna element are formed by the first conductor portion 11 and the ground conductor 20G. Is configured.
  • the resistance component is omitted in the equivalent circuit.
  • the antenna length for achieving the same resonance frequency is longer than that of a monopole antenna that resonates at ⁇ / 4. Therefore, the antenna has a high L property.
  • the effect of lowering the resonance frequency is produced by the CP of FIG. 4, and the antenna length can be shortened by that amount, so that the L property is suppressed.
  • FIG. 5 is a diagram showing the electric field strength distribution in the fundamental wave resonance of the half-wavelength loop antenna. The distribution from the output portion of the transformer type matching circuit 31 shown in FIG. 3 to the contact portion to the ground conductor 20G via the first conductor portion 11 is shown, and the electric field is maximized at the intermediate point. The capacitance part CP is near the maximum position of the electric field distribution.
  • the facing area of the gap GAP1 can be easily increased, for example, on a flexible substrate. Larger capacitance can be obtained as compared with the formed conductor pattern and the capacitor by the LDS (Laser Direct Structuring) conductor pattern.
  • FIG. 6 (A) is a circuit diagram of the transformer type matching circuit 31, and FIG. 6 (B) is an equivalent circuit diagram thereof.
  • the transformer type matching circuit 31 includes a first coil L1 connected to the first power feeding circuit 1 and a second coil L2 coupled to the first coil L1.
  • the first coil L1 and the second coil L2 are connected in series, and both ends of the series connection circuit between the first coil L1 and the second coil L2 are connected to the first input / output port and the second coil L2.
  • An autotransformer with both ends as second input / output ports.
  • the terminals (P1-G) are the first input / output ports
  • the terminals (P2-G) are the second input / output ports.
  • the transformer type matching circuit 31 is a transformer type circuit in which the first coil L1 and the second coil L2 are tightly coupled via a mutual inductance M. As shown in FIG. 6B, this transformer type matching circuit 31 can be equivalently converted into a T type circuit by three inductance elements Z1, Z2, Z3.
  • the inductance of the first coil L1 shown in FIG. 6 (A) is represented by L1
  • the inductance of the second coil L2 is represented by L2
  • the mutual inductance is represented by M
  • the inductance of the first inductance element Z1 in FIG. 6 (B) is L1 + M
  • the inductance of the second inductance element Z2 is ⁇ M
  • the inductance of the third inductance element Z3 is L2 + M. Therefore, the impedance conversion ratio is (L1 + L2 + 2M): L2.
  • the first power supply circuit 1 side is 50 ⁇ and the antenna side is 5 ⁇
  • 10: 1 impedance conversion is performed.
  • a loop antenna has a lower antenna impedance than a feeding circuit, so it is easy to perform impedance matching by using a transformer-type matching circuit 31 that can obtain such a large impedance conversion ratio.
  • the inductance between the terminals (P1-G) is L1 + L2 + 2M, a high impedance conversion ratio can be realized with the first coil L1 and the second coil with a small number of turns. Therefore, the resistance component of the transformer type matching circuit 31 can be suppressed, and the insertion loss can be suppressed.
  • FIG. 7A is a circuit diagram of the transformer type matching circuit 31, and FIGS. 7B and 7C are impedance matching circuits as comparative examples.
  • FIG. 8 (A) shows the reflectance coefficient (S11) of the antenna element having a large L property as seen from the feeding circuit
  • FIG. 8 (B) shows the impedance of the antenna as seen from the feeding circuit on the Smith chart.
  • FIG. 9A is a reflection coefficient (S11) of the antenna element having a small L property as seen from the feeding circuit
  • FIG. 9B is a Smith chart showing the impedance of the antenna as seen from the feeding circuit. It is the figure shown above. Lines A, B, and C in FIGS. 8 (A), 8 (B), 9 (A), and 9 (B) are shown in FIGS. 7 (A), 7 (B), and 7 (C). It corresponds to the characteristics of each impedance matching circuit. Further, the line D in FIGS. 8 (A), 8 (B), 9 (A), and 9 (B) is a characteristic without an impedance matching circuit.
  • the impedance of the antenna element having a large L property is displaced from the Dp1 point to the Dp2 point along the line D in FIG. 8B as the frequency increases.
  • the reactance at the Dp1 point is -100 ⁇
  • the reactance at the Dp2 point is + 100 ⁇ . This difference of 200 ⁇ corresponds to the magnitude of the L property of the antenna element.
  • the frequency band for impedance matching is narrow. Further, even if impedance conversion is performed by the transformer type matching circuit 31 shown in FIG. 7A, the frequency band for impedance matching is narrow as shown by line A in FIGS. 8A and 8B. That is, although it is a transformer type matching circuit, it is not much different from the impedance matching circuit by the LC circuit.
  • the impedance matching of the first feeding circuit 1 and the antenna element can be performed over a wide band by impedance conversion by the transformer type matching circuit 31.
  • FIG. 10 is a circuit diagram of another transformer type matching circuit 32 according to this embodiment.
  • the transformer type matching circuit 32 includes a first coil L1 connected to the first feeding circuit 1 and a second coil L2 coupled to the first coil L1.
  • a transformer is composed of the first coil L1 and the second coil L2.
  • the terminals (P1-G) are the first input / output ports
  • the terminals (P2-G) are the second input / output ports.
  • the transformer type matching circuit 31 is a transformer in which the first coil L1 and the second coil L2 are tightly coupled via a mutual inductance M.
  • transformer type matching circuit 32 having a structure in which the first coil L1 and the second coil L2 that are magnetically coupled to each other are separated may be used.
  • Second Embodiment an antenna device in which the feeding position with respect to the first conductor portion 11 is different from the example shown in the first embodiment is shown.
  • FIG. 11 is a plan view of the antenna device 102 portion of the electronic device according to the second embodiment. Similar to the example shown in FIG. 3 in the first embodiment, it is a plan view in a state where the circuit board 20 and the frame 10 are arranged in the same plane with the frame 10 shown in FIG. 2 tilted down.
  • the circuit board 20 has a region in which the ground conductor 20G is formed and a non-ground portion 20N in which the ground conductor 20G is not formed.
  • the frame 10 is made of a metal plate.
  • a first conductor portion 11 and a second conductor portion 12 are formed in a part of the frame 10.
  • a capacitance portion CP is formed at positions adjacent to each other of the first conductor portion 11 and the second conductor portion 12.
  • a slit-shaped gap GAP1 is formed between the first conductor portion 11 and the second conductor portion 12, and the capacitance portion CP is formed in this gap GAP1.
  • the second conductor portion 12 is conducting to the ground conductor 20G of the circuit board 20.
  • the first conductor portion 11 has a first end FE and a second end SE, and the second end SE is close to the second conductor portion 12.
  • the first conductor portion 11 is located at a position facing the non-ground portion 20N of the circuit board 20, and is separated from the ground conductor 20G.
  • the second conductor portion 12 is conductive to the ground conductor 20G of the circuit board 20.
  • the first power feeding circuit 1 is connected to the first conductor portion 11 via an impedance matching circuit by a transformer type matching circuit 31.
  • the first feeding circuit 1 is connected to the feeding position Pf which is returned in the direction of the first end FE by a distance P from the second end SE of the first conductor portion 11 via an impedance matching circuit. That is, the first conductor portion 11 protrudes in the direction of the second conductor portion 12 by a distance P from the feeding position Pf with respect to the first conductor portion 11.
  • the capacitance portion CP is in the vicinity of a position separated by a quarter wavelength or a position separated by a quarter wavelength from the feeding position Pf (relative to the loop) with respect to the first conductor portion 11.
  • Other configurations are as shown in the first embodiment.
  • FIG. 12 is an equivalent circuit diagram in the vicinity of the fundamental wave resonance frequency corresponding to the portion of the antenna device 102 from the transformer type matching circuit 31 to the ground conductor 20G via the first conductor portion 11.
  • the antenna element of the antenna device 102 is a kind of loop antenna.
  • An inductor component Lant1 is formed between the transformer type matching circuit 31 and the capacitance portion CP generated in the slit-shaped gap GAP1, and the inductance components Lant2, Lant3 and the capacitance component Cm of the antenna element are formed by the first conductor portion 11 and the ground conductor 20G. Is configured.
  • the resistance component is omitted in the equivalent circuit.
  • the conductor portion extends from the feeding position Pf to the second end SE with respect to the first conductor portion 11, the current of the conductor portion from the feeding position Pf to the second end SE becomes small and the voltage ( The maximum point (electric field) can be concentrated in the vicinity of the protruding portion at the distance P.
  • the capacitance section CP it is possible to add a capacitance by the capacitance section CP to a place where the voltage (electric field) strength is high, and the effect of adding this capacitance is enhanced.
  • the feeding position Pf with respect to the first conductor portion 11 is not limited to the second end SE of the first conductor portion 11 or its vicinity.
  • FIG. 13 (A) is a plan view of the antenna device 103A portion of the electronic device according to the third embodiment
  • FIG. 13 (B) is a plan view of the antenna device 103B portion of the electronic device according to the third embodiment.
  • the first feeding circuit 1 is connected to the first conductor portion 11 via the impedance matching circuit 30.
  • the impedance matching circuit 30 is composed of a transformer type matching circuit 31, a matching circuit 41 provided in front of the transformer matching circuit 31, and a matching circuit 42 provided in the subsequent stage. Other configurations are as shown in the first embodiment and the second embodiment.
  • the matching circuits 41 and 42 are, for example, an LC circuit including a series-connected inductor and a capacitor shunt-connected to the ground, or an LC circuit including a series-connected capacitor and an inductor shunt-connected to the ground.
  • the matching circuit 42 may include reactance elements (L, C) that adjust the resonance frequency of the antenna.
  • the transformer type matching circuit 31 and the matching circuits 41 and 42 are provided in the non-ground portion 20N is shown, but these may be provided in the forming portion of the ground conductor 20G.
  • a matching circuit 42 including an element for adjusting the resonance frequency of the antenna is arranged in the non-ground portion 20N, and a transformer type matching circuit 31 and a matching circuit 41 including a shunt connection are formed as a ground conductor 20G. It may be arranged in a part.
  • FIG. 14 is a diagram schematically showing the operation of the impedance matching circuit 30.
  • the loci S0, S1 and S2 represent the loci of the impedance seen from the first power feeding circuit 1 on the Smith chart when the frequency is swept over the frequency band used by the antenna element.
  • the locus S0 represents the displacement of the impedance in a state where the impedance is matched by the matching circuit 42.
  • the locus S1 represents the displacement of the impedance in the state of being impedance-converted by the transformer type matching circuit 31. In this way, the arc of the impedance locus is reduced by the transformer type matching circuit 31.
  • the locus S2 represents the displacement of the impedance in the state of impedance matching by the matching circuit 41.
  • the matching circuit 41 is composed of a shunt-connected capacitor and a series-connected inductor, and is impedance-matched as shown in FIG. As a result, the impedance locus is reduced and transitions to the center of the Smith chart.
  • the LC circuit is provided in the front stage and the rear stage of the transformer type matching circuit 31, but the LC circuit may be provided only in the front stage and only in the rear stage.
  • the wide band of impedance matching can be achieved as compared with the characteristics of the transformer type matching circuit 31 alone.
  • an LC circuit may be provided in the front stage, the rear stage, or the front and rear stages of the transformer type matching circuit 31.
  • FIG. 15A is a diagram showing a configuration of a particular impedance matching circuit of the antenna device according to the third embodiment.
  • the first radiating element 11R is a radiating element composed of the first conductor portion 11 and the ground conductor 20G.
  • the first feeding circuit 1 is connected to the first radiating element 11R via an impedance matching circuit 30.
  • the impedance matching circuit 30 is connected between the transformer type matching circuit 31, the matching circuit 41 provided in the front stage thereof, the matching circuit 42 provided in the subsequent stage, the transformer type matching circuit 31 and the ground. It is composed of a matching circuit 43.
  • the matching circuit 41 in FIG. 15A is composed of an inductor connected to the series and a capacitor connected to the shunt.
  • the matching circuit 42 and the matching circuit 43 are also composed of an inductor, a capacitor, or an inductor and a capacitor.
  • the matching circuit 42 is shown to be shunt-connected to the ground, but the circuit may not have this shunt connection.
  • the matching circuit 43 shows that the two terminals are connected to the ground, but the matching circuit 43 is simply between the transformer type matching circuit 31 and the ground. It may be a circuit connected in series.
  • the matching circuit 43 is composed of an inductor connected between the transformer type matching circuit 31 and the ground, the inductor does not magnetically couple with the first coil L1 and the second coil L2. Therefore, impedance conversion is performed by the inductance of the matching circuit 43. The ratio and impedance matching can be fine-tuned.
  • FIG. 15B is an example in which the input side and the output side of the transformer type matching circuit 31 shown in FIG. 15A are connected in the opposite relationship.
  • the transformer type matching circuit 31 to the first radiation element 11R side If the impedance looks equivalently high, an impedance matching circuit that increases the impedance may be configured in this way.
  • FIG. 15 (C) shows specific examples of the matching circuits 42 and 43 in FIGS. 15 (A) and 15 (B). Further, FIG. 15C shows an example of a matching circuit 41 different from the matching circuit 41 shown in FIGS. 15A and 15B.
  • the matching circuit 42 may form a circuit for adjusting the resonance frequency of the first radiating element 11R. Further, the matching circuit 41 in the previous stage of the transformer type matching circuit 31 may be provided with an inductor for shunt connection.
  • FIG. 16 is a diagram showing a configuration of another impedance matching circuit of the antenna device according to the third embodiment.
  • the first feeding circuit 1 is connected to the first radiating element 11R via an impedance matching circuit 30.
  • the impedance matching circuit 30 is connected between the transformer type matching circuit 32, the matching circuit 41 provided in the front stage thereof, the matching circuit 42 provided in the subsequent stage, the transformer type matching circuit 32, and the ground. It is composed of a matching circuit 43.
  • the impedance matching circuit may be composed of transformer type matching circuits 31 and 32 and an LC circuit.
  • FIG. 17 is a plan view of the antenna device 104 portion of the electronic device according to the fourth embodiment.
  • the first power feeding circuit 1 is connected to the first conductor portion 11 via an impedance matching circuit 30.
  • the impedance matching circuit 30 is composed of a transformer type matching circuit 31, a matching circuit 41 provided in front of the transformer matching circuit 31, and a matching circuit 42 provided in the subsequent stage.
  • a notch-shaped portion 11N is formed between the first end FE of the first conductor portion 11 and the third conductor portion 13. Other configurations are as shown in the third embodiment.
  • FIG. 18 is an equivalent circuit diagram in the vicinity of the fundamental wave resonance frequency corresponding to the portion of the antenna device 104 from the impedance matching circuit 30 to the ground conductor 20G via the first conductor portion 11.
  • the antenna element of the antenna device 104 is a kind of loop antenna.
  • An inductor component Lant1 is formed between the impedance matching circuit 30 and the capacitance portion CP generated in the slit-shaped gap GAP1, and the inductance components Lant2, Lant3 and the capacitance component Cm of the antenna element are formed by the first conductor portion 11 and the ground conductor 20G. It is composed.
  • the resistance component is omitted in the equivalent circuit.
  • the notched shape portion 11N is formed between the first end FE of the first conductor portion 11 and the third conductor portion 13, the non-ground of the first conductor portion 11 and the circuit board 20 is formed.
  • the connection point (short point) SP with the periphery of the portion 20N is determined in a narrow area. Therefore, even if a part of the other antenna element is provided in the third conductor portion 13, the first conductor portion 11 can be separated from the other antenna element. That is, the frame 10 can be used as a part of the antenna element of the other antenna device without dedicating it to the antenna device 104.
  • FIG. 19 is a plan view of the antenna device 105A portion of the electronic device according to the fifth embodiment.
  • the first power feeding circuit 1 is connected to the first conductor portion 11 via an impedance matching circuit 30.
  • the impedance matching circuit 30 is composed of a transformer type matching circuit 31, a matching circuit 41 provided in front of the transformer matching circuit 31, and a matching circuit 42 provided in the subsequent stage.
  • a gap GAP1 is formed between the second end SE of the first conductor portion 11 and the second conductor portion 12, and the gap GAP2 is formed between the first end FE of the first conductor portion 11 and the third conductor portion 13. Is formed.
  • a reactance circuit 51 is connected between the first end FE of the first conductor portion 11 and the ground. That is, the reactance circuit 51 is inserted in the loop of the loop antenna.
  • the reactance circuit 51 is composed of a plurality of reactance elements X and a switch SW for selecting one of them.
  • the reactance element X is selected by the control signal for the switch SW, the resonance frequency of the antenna is shifted, and an antenna device covering a wider band is configured.
  • FIG. 20 is a plan view of another antenna device 105B portion of the electronic device according to the fifth embodiment.
  • the antenna device 105B includes a variable reactance element 52 instead of the reactance circuit 51 shown in FIG.
  • the variable reactance element 52 is, for example, a variable capacitance element whose capacitance is determined by an applied voltage. In this example, the resonant frequency of the antenna is shifted by the applied voltage to form an antenna device that covers a wider band.
  • FIG. 21 is a plan view of the antenna device 106A portion of the electronic device according to the sixth embodiment.
  • the first power feeding circuit 1 is connected to the first conductor portion 11 via an impedance matching circuit 30.
  • a gap GAP1 is formed between the second end SE of the first conductor portion 11 and the second conductor portion 12.
  • a reactance circuit 51 is connected between the first end FE and the second end SE of the first conductor portion 11 and between the ground. That is, the reactance circuit 51 is connected between a predetermined position of the loop of the loop antenna and the ground.
  • the reactance circuit 51 is composed of a plurality of reactance elements X and a switch SW for selecting one of them.
  • the reactance element X is selected by the control signal for the switch SW, the resonance frequency of the antenna is shifted, and an antenna device covering a wider band is configured.
  • FIG. 22 is a plan view of another antenna device 106B portion of the electronic device according to the sixth embodiment.
  • the antenna device 106B includes a variable reactance element 52 instead of the reactance circuit 51 shown in FIG.
  • the variable reactance element 52 is, for example, a variable capacitance element whose capacitance is determined by an applied voltage. In this example, the resonant frequency of the antenna is shifted by the applied voltage to form an antenna device that covers a wider band.
  • FIG. 23 is a plan view of the antenna device 107 portion of the electronic device according to the seventh embodiment.
  • FIG. 24 is an equivalent circuit diagram of the impedance matching circuit 30 in FIG. 23.
  • the first power feeding circuit 1 is connected to the first conductor portion 11 via an impedance matching circuit 30.
  • the impedance matching circuit 30 is composed of a transformer type matching circuit 31 and an inductor L0. Other configurations are as shown in the first embodiment and the second embodiment.
  • the transformer-type matching circuit 31 is an autotransformer in which the first coil L1 and the second coil L2 are connected in series, and the impedance matching circuit 30 has an inductor L0 connected in series to the second coil L2. That is, in the impedance matching circuit 30, both ends of the series connection circuit of the first coil L1, the second coil L2 and the inductor L0 are the first input / output ports, and both ends of the series connection circuit of the second coil L2 and the inductor L0 are secondly inserted. This is a circuit that serves as an output port.
  • the antenna element a radiation element including a part of the frame 10 and the ground conductor 20G of the circuit board 20.
  • the impedance matching circuit may operate like a high-pass filter.
  • the impedance of the shunt path can be increased in the frequency region where the impedance of the antenna element is high. As a result, the high-pass filter-like operation can be suppressed.
  • FIG. 25 is a diagram showing the frequency characteristics of the insertion loss IL not including the loss due to reflection of the antenna device 107 and the frequency characteristics of the insertion loss IL not including the loss due to reflection of the antenna device of the comparative example.
  • line A is a characteristic of the antenna device 107
  • line B is a characteristic of the antenna device when the inductor L0 shown in FIG. 23 is not provided.
  • the impedance conversion ratio of the impedance matching circuit 30 is (L1 + L2 + 2M + L0) :( L2 + L0). Therefore, the impedance conversion ratio of the impedance matching circuit 30 can be adjusted by appropriately determining the inductance of the inductor L0.
  • the transformer type matching circuit 31 and the inductor L0 may be separate elements or may be integrally formed in the same element.
  • FIG. 26 is a diagram showing the configuration of the antenna device 108 according to the eighth embodiment.
  • the antenna device 108 includes a first antenna device 108A and a second antenna device 108B.
  • the first antenna device 108A includes a first radiation element 11R, a capacitance portion CP, and an impedance matching circuit 30.
  • the second antenna device 108B is composed of the second radiating element 12R.
  • the reactance element may be inserted at the position indicated by the alternate long and short dash line to adjust the characteristics of the antenna.
  • FIG. 27 is a plan view of the antenna device 108. Similar to the notation method shown in FIG. 3 and the like in the first embodiment, this figure is a plan view in a state where the circuit board 20 and the frame 10 are arranged in the same plane.
  • FIG. 28 is a plan view of the antenna device 108 and the electronic device 208 including the antenna device 108.
  • the electronic device 208 includes a housing 100 having a conductive frame 10, a first power feeding circuit 1, a second power feeding circuit 2, and a circuit board 20 housed in the housing 100. Further, the antenna device 108 includes a first conductor portion 11, a second conductor portion 12, and an impedance matching circuit 30.
  • the circuit board 20 has a region in which the ground conductor 20G is formed and non-ground portions 20N1 and 20N2 in which the ground conductor 20G is not formed.
  • the frame 10 is made of a metal plate.
  • a first conductor portion 11, a second conductor portion 12, and a fourth conductor portion 14 are formed in a part of the frame 10.
  • a capacitance portion CP is formed at positions adjacent to each other of the first conductor portion 11 and the second conductor portion 12.
  • a slit-shaped gap GAP1 is formed between the first conductor portion 11 and the second conductor portion 12, and the capacitance portion CP is formed in this gap GAP1.
  • the first radiating element 11R shown in FIG. 26 includes the first conductor portion 11 and the ground conductor 20G shown in FIG. 27, and the second radiating element 12R includes the second conductor portion 12. More specifically, the first radiating element 11R is composed of the first conductor portion 11 and the ground conductor 20G. Further, the second radiating element 12R is composed of the second conductor portion 12 and the ground conductor 20G.
  • a loop is formed by the first feeding circuit 1, the impedance matching circuit 30, the first conductor portion 11 and the ground conductor 20G, and the first radiating element 11R constitutes a loop antenna.
  • the configuration of the first radiating element 11R is the same as that of the antenna device 101 and the like shown in the first embodiment.
  • the second feeding circuit 2, the second conductor portion 12, and the ground conductor 20G form a loop, and the second radiating element 12R constitutes a loop antenna.
  • FIG. 29 is a diagram showing the frequency characteristics of the reflection coefficient seen from the first feeding circuit 1 and the second feeding circuit 2 of the antenna device 108 according to the eighth embodiment.
  • A1 shows the characteristics of the first radiating element 11R
  • A2 shows the characteristics of the second radiating element 12R.
  • the first radiation element 11R and the impedance matching circuit 30 provide characteristics with high radiation efficiency over a wide band on the low frequency side.
  • the second radiating element 12R can obtain a characteristic of high radiating efficiency also on the high frequency side.
  • the antenna by the first radiating element 11R and the impedance matching circuit 30 was made to act as an antenna on the low frequency side, and the antenna by the second radiating element 12R was made to act as an antenna on the high frequency side. May have the opposite relationship.
  • the frequency band having high radiation efficiency is separated into the low frequency side and the high frequency side, but these two frequency bands may partially overlap.
  • the second conductor portion 12 is used as a part of the second radiating element, [antenna bandwidth / conductor portion length of the occupied metal frame or the like] can be increased. That is, a compact and wideband antenna device can be realized.
  • FIG. 30 is a diagram showing the configuration of the antenna device 109A according to the ninth embodiment.
  • the antenna device 109A includes a first radiating element 11R, a second radiating element 12R, a capacitance portion CP, and an impedance matching circuit 30.
  • the reactance element may be inserted at the position indicated by the alternate long and short dash line to adjust the characteristics of the antenna.
  • FIG. 31 is a plan view of the antenna device 109A. Similar to the notation method shown in FIG. 3 and the like in the first embodiment, this figure is a plan view in a state where the circuit board 20 and the frame 10 are arranged in the same plane.
  • the antenna device 109A includes a first conductor portion 11, a second conductor portion 12, and an impedance matching circuit 30.
  • the circuit board 20 has a region in which the ground conductor 20G is formed and non-ground portions 20N1 and 20N2 in which the ground conductor 20G is not formed.
  • the frame 10 is made of a metal plate, and a first conductor portion 11, a second conductor portion 12, and a fourth conductor portion 14 are formed in a part of the frame 10.
  • a slit-shaped gap GAP1 is formed between the first conductor portion 11 and the second conductor portion 12, and a capacitance portion CP is formed in this gap GAP1.
  • the second radiating element 12R composed of the second conductor portion 12 and the ground conductor 20G is a non-feeding radiating element.
  • FIG. 32 (A) is a diagram showing the frequency characteristics of the reflection coefficient seen from the first feeding circuit 1 of the antenna device 109A according to the ninth embodiment.
  • FIG. 32B is a diagram showing the frequency characteristics of the reflection coefficient seen from the first feeding circuit 1 of the antenna device of the comparative example in the case where the second radiating element 12R which is a non-feeding radiation element is not provided.
  • the provision of the second radiation element 12R as a non-feeding radiation element provides high radiation efficiency over a wide band. The characteristics are obtained.
  • FIG. 33 is a diagram showing the configuration of another antenna device 109B according to the ninth embodiment.
  • the antenna device 109B includes a first radiating element 11R, a second radiating element 12R, a capacitance portion CP, and an impedance matching circuit 30.
  • FIG. 34 is a plan view of the antenna device 109B. Similar to the notation method shown in FIG. 3 and the like in the first embodiment, this figure is a plan view in a state where the circuit board 20 and the frame 10 are arranged in the same plane.
  • the antenna device 109B includes a first conductor portion 11, a second conductor portion 12, and an impedance matching circuit 30.
  • the circuit board 20 has a region in which the ground conductor 20G is formed and non-ground portions 20N1 and 20N2 in which the ground conductor 20G is not formed.
  • a first conductor portion 11 and a second conductor portion 12 are formed in a part of the frame 10.
  • a slit-shaped gap GAP1 is formed between the first conductor portion 11 and the second conductor portion 12, and a capacitance portion CP is formed in this gap GAP1.
  • Both ends of the second conductor portion 12 are conducting to the ground conductor 20G, and the second conductor portion 12 and the ground conductor 20G form a non-feeding loop antenna.
  • the non-feeding radiation element may be a loop antenna.
  • FIG. 35 is a diagram showing the configuration of the antenna device 110A according to the tenth embodiment.
  • the antenna device 110A includes a first radiating element 11R, a second radiating element 12R, a capacitance portion CP, an impedance matching circuit 30, and a switch SW.
  • the switch SW switches whether to connect the first feeding circuit 1 to the impedance matching circuit 30 or the second radiating element 12R according to the control signal.
  • This antenna device 110A does not include the second power feeding circuit 2 in the antenna device 108 shown in FIG. 26, and depending on the selection of the switch SW, a state in which power is supplied to the first radiating element 11R and a state in which power is supplied to the second radiating element 12R can be obtained.
  • the resonance frequency bands of the first radiating element 11R and the second radiating element 12R are different, and the antenna device 110A can be used over a wide band by selecting the switch SW according to the desired communication frequency band.
  • the switch SW in FIG. 35 may be replaced with a diplexer. If it is a switch SW, either one will be connected for a certain period of time, but if it is a diplexer, it will be possible to connect at the same time while suppressing the interference between the first radiating element 11R and the second radiating element 12R. It is effective for carrier aggregation in the frequency band covered by one radiating element.
  • FIG. 36 is a diagram showing a configuration of another antenna device 110B according to the tenth embodiment.
  • the antenna device 110B includes a first radiating element 11R, a second radiating element 12R, a capacitance portion CP, an impedance matching circuit 30, and a switch SW.
  • the second power feeding circuit 2 is connected to the first end of the second radiating element 12R, and the switch SW is inserted between the second end of the second radiating element 12R and the ground.
  • the switch SW is in a conductive / open state according to the control signal. That is, the second end of the second radiating element 12R is switched between grounding and opening.
  • FIG. 37 is a diagram showing the configuration of yet another antenna device 110C according to the tenth embodiment.
  • This antenna device 110C is also composed of a first radiation element 11R, a second radiation element 12R, a capacitance portion CP, an impedance matching circuit 30, and a switch SW.
  • the second power feeding circuit 2 is connected to the first end of the second radiating element 12R, the second end of the second radiating element 12R is grounded, and the first end and the second end of the second radiating element 12R are connected.
  • a switch SW is connected between the space and the ground.
  • the switch SW is in a conductive / open state according to the control signal. That is, the predetermined point between the first end and the second end of the second radiating element 12R is switched between grounding and opening.
  • the second radiating element 12R shifts the frequency band having high radiating efficiency according to the conduction / opening state of the switch SW. Therefore, the antenna devices 110B and 110C can be used over a wide band by selecting the switch SW according to the desired communication frequency band.
  • FIGS. 36 and 37 show an example in which a switch SW for switching conduction / opening is provided on the circuit diagram
  • a switch circuit for selecting a reactance element may be configured in addition to switching conduction / opening.
  • FIG. 38 is an example thereof.
  • reactance elements X1 and X2 are connected between the switch SW and the ground.
  • the reactance elements X1 and X2 are inductors and capacitors. By switching the reactance in this way, the frequency band with high radiation efficiency of the antenna may be shifted.
  • the reactance element may be inserted at the position indicated by the alternate long and short dash line to adjust the characteristics of the antenna.
  • FIG. 39 is a plan view showing the structures of the first conductor portion 11 and the second conductor portion 12 of the antenna device according to the eleventh embodiment.
  • FIG. 39 is a plan view of the circuit board 20 and the frame 10 arranged in the same plane.
  • a slit-shaped gap GAP1 is formed between the first conductor portion 11 and the second conductor portion 12, and the capacitance portion CP is formed in this gap GAP1.
  • the capacitance of the capacitance portion CP may be set not only by the distance between the gaps GAP1 but also by the dimension in the height direction of the frame 10.
  • FIG. 40 (A) is a plan view of another antenna device according to the eleventh embodiment.
  • FIG. 40 (B) is a cross-sectional view taken along the line YY in FIG. 40 (A).
  • the frame 10 is composed of a metal frame 10M and an insulating resin film 10R coated on the outer surface thereof.
  • the lower end of the metal frame 10M is conductive to the metal pad 10P.
  • Wiring patterns 20W are formed on the circuit board 20, and these wiring patterns 20W are conducted to the metal pad 10P via the spring pins 20P.
  • the display panel 60 is arranged below.
  • the capacitance portion CP is formed between the two wiring patterns 20W formed on the circuit board 20. In this way, the capacitance of the capacitance portion CP may be set according to the interval and length of the wiring pattern 20W.
  • FIG. 41 (A) is a plan view of yet another antenna device according to the eleventh embodiment.
  • 41 (B) is a plan view in a state where the circuit board 20 of FIG. 41 (A) is removed.
  • FIG. 41 (C) is a cross-sectional view taken along the line YY in FIG. 41 (A).
  • This cross-sectional structure is similar to the example shown in FIG. 40 (B). That is, the frame 10 is composed of the metal frame 10M and the insulating resin film 10R coated on the outer surface thereof, and the lower end portion of the metal frame 10M is conductive to the metal pad 10P. Further, a wiring pattern 20W is formed on the circuit board 20, and these wiring patterns 20W are conducted to the metal pad 10P via the spring pin 20P.
  • a capacitance portion CP is formed between two metal pads 10P through which the metal frame 10M is conducted.
  • the capacitance of the capacitance portion CP may be set according to the interval and length of the metal pads 10P.
  • the antenna device whose basic component is a loop antenna is shown, but any antenna device having a feeding circuit, an impedance matching circuit, a first conductor portion, and a loop portion formed by a ground conductor.
  • the present invention can be applied.
  • Capacitive component CP Capacitive part FE ... First end of the first conductor part GAP1, GAP2 ... Gap GND ... Ground region L0 ... Inductance L1 ... First coil L2 ... Second coil Lant1, Lant2, Lant3 ... Inductance component of antenna M ... Mutual inductance NGA ... Non-ground region Pf ... Feeding position PL ... Loop conductor pattern P1 ... First input / output port terminal P2 ... Second input / output port terminal S0, S1, S2 ... Trajectory SE ... First conductor 2nd end SW ... Switch X ... Reactance element Z1 ... 1st inductance element Z2 ... 2nd inductance element Z3 ...

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  • Details Of Aerials (AREA)
  • Variable-Direction Aerials And Aerial Arrays (AREA)
  • Support Of Aerials (AREA)
  • Transceivers (AREA)
  • Transmitters (AREA)
PCT/JP2020/048326 2020-02-06 2020-12-24 アンテナ装置及び電子機器 WO2021157244A1 (ja)

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CN202090000932.5U CN217334385U (zh) 2020-02-06 2020-12-24 天线装置以及电子设备
JP2021575657A JP7211543B2 (ja) 2020-02-06 2020-12-24 アンテナ装置及び電子機器

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Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2007194995A (ja) * 2006-01-20 2007-08-02 Murata Mfg Co Ltd アンテナ及び無線通信機
JP2012160817A (ja) * 2011-01-31 2012-08-23 Murata Mfg Co Ltd アンテナ及び無線通信機
WO2016114182A1 (ja) * 2015-01-16 2016-07-21 株式会社村田製作所 アンテナ整合回路、アンテナ装置および通信端末装置
JP3211580U (ja) * 2014-03-03 2017-07-27 アップル インコーポレイテッド 近距離アンテナを有する電子機器
US20200021011A1 (en) * 2018-07-13 2020-01-16 Apple Inc. Electronic Device Having Angle of Arrival Detection Capabilities

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2007194995A (ja) * 2006-01-20 2007-08-02 Murata Mfg Co Ltd アンテナ及び無線通信機
JP2012160817A (ja) * 2011-01-31 2012-08-23 Murata Mfg Co Ltd アンテナ及び無線通信機
JP3211580U (ja) * 2014-03-03 2017-07-27 アップル インコーポレイテッド 近距離アンテナを有する電子機器
WO2016114182A1 (ja) * 2015-01-16 2016-07-21 株式会社村田製作所 アンテナ整合回路、アンテナ装置および通信端末装置
US20200021011A1 (en) * 2018-07-13 2020-01-16 Apple Inc. Electronic Device Having Angle of Arrival Detection Capabilities

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