WO2017122480A1 - Dispositif d'antenne et dispositif électronique - Google Patents

Dispositif d'antenne et dispositif électronique Download PDF

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Publication number
WO2017122480A1
WO2017122480A1 PCT/JP2016/086969 JP2016086969W WO2017122480A1 WO 2017122480 A1 WO2017122480 A1 WO 2017122480A1 JP 2016086969 W JP2016086969 W JP 2016086969W WO 2017122480 A1 WO2017122480 A1 WO 2017122480A1
Authority
WO
WIPO (PCT)
Prior art keywords
coil
circuit
transmission system
inner peripheral
outer peripheral
Prior art date
Application number
PCT/JP2016/086969
Other languages
English (en)
Japanese (ja)
Inventor
真大 小澤
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.)
Filing date
Publication date
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 CN201690001351.7U priority Critical patent/CN208589547U/zh
Publication of WO2017122480A1 publication Critical patent/WO2017122480A1/fr

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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
    • H01Q7/00—Loop antennas with a substantially uniform current distribution around the loop and having a directional radiation pattern in a plane perpendicular to the plane of the loop
    • H—ELECTRICITY
    • 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

Definitions

  • the present invention relates to an antenna device used in an RFID system or a short-range wireless communication system, and an electronic apparatus including the antenna device.
  • Patent Document 1 discloses a device in which one coil is used as both an NFC system and a non-contact power feeding system.
  • a switch is provided in the middle of a coil, and the switch is turned on to form one coil, which is used as a non-contact power supply coil.
  • the coil is bisected by turning off the switch, and one of them is used as an NFC system.
  • Patent Document 1 when the antenna size is greatly different from the counterpart, the leakage magnetic flux may increase. In this case, the coupling between the devices is weak, and there is a possibility that stable communication cannot be performed. In addition, depending on the antenna size and the positional relationship of the other party, a null point at which stable communication cannot be performed occurs.
  • an object of the present invention is to provide an antenna device and an electronic apparatus that perform stable communication using an optimum coil antenna according to a communication situation with a transmission partner.
  • the present invention is an antenna device that is used in both the first non-contact transmission system and the second non-contact transmission system and includes a spiral coil conductor in plan view, and the coil conductor includes an inner peripheral coil section connected in series.
  • An outer coil portion, one end of the coil conductor is connected to a first end of the circuit of the first contactless transmission system, and the other end of the coil conductor is a circuit of the first contactless transmission system.
  • a switch for connecting the connection portion of the outer peripheral coil portion and the other end of the coil conductor to the circuit for the second non-contact transmission system is provided.
  • the coil diameter of the coil antenna can be changed according to the transmission partner. As a result, it is possible to avoid the possibility that the leakage flux increases due to a large difference from the antenna size of the other party and stable communication cannot be performed. Further, by appropriately changing the size of the coil antenna, it is possible to avoid deterioration of communication characteristics due to the null point.
  • a connection portion of the inner peripheral coil portion and the outer peripheral coil portion is connected to a first end of the circuit for the second non-contact transmission system, and one end of the coil conductor or the other end of the coil conductor is connected to the first end of the coil conductor.
  • the structure provided with the switch connected to the 2nd end of the circuit for 2nd non-contact transmission systems may be sufficient.
  • the present invention provides an antenna device including a spiral coil conductor in plan view, a circuit for the first contactless transmission system connected to the antenna device, and the second contactless transmission connected to the antenna device.
  • the coil conductor has an inner peripheral coil portion and an outer peripheral coil portion connected in series, and one end of the coil conductor is a circuit of the first non-contact transmission system.
  • the other end of the coil conductor is connected to a second end of the circuit of the first non-contact transmission system, and the connection portion of the inner and outer peripheral coil portions and the coil conductor.
  • Is connected to the circuit for the second non-contact transmission system, or the connection part of the inner and outer peripheral coil parts and the other end of the coil conductor are used for the second non-contact transmission system. Characterized in that it comprises a switch for connecting to the circuit.
  • the coil diameter of the coil antenna can be changed according to the transmission partner. As a result, it is possible to avoid the possibility that the leakage flux increases due to a large difference from the antenna size of the other party and stable communication cannot be performed. Further, by appropriately changing the size of the coil antenna, it is possible to avoid deterioration of communication characteristics due to the null point.
  • a connection portion of the inner peripheral coil portion and the outer peripheral coil portion is connected to a first end of the circuit for the second non-contact transmission system, and one end of the coil conductor or the other end of the coil conductor is connected to the first end of the coil conductor. You may provide the switch connected to the 2nd end of the circuit for 2nd non-contact transmission systems.
  • the electronic device may include a circuit that detects a transmission rate between the coil conductor and a transmission-side coil conductor, and a circuit that switches the switch according to the transmission rate.
  • communication can be performed using a coil antenna having a high transmission rate.
  • the carrier frequency in the second contactless transmission system is preferably higher than the carrier frequency in the first contactless transmission system.
  • the first contactless transmission system is a power transmission system and the second contactless transmission system is a communication system.
  • the power transmission system is preferably a magnetic resonance power transmission system.
  • the communication system is preferably an NFC system.
  • an optimal coil antenna can be selected according to the communication status with the transmission partner, and stable communication can be performed.
  • FIG. 1 is a diagram illustrating a configuration of an electronic device according to an embodiment
  • the figure for demonstrating the coil antenna used when switching a switch The figure for demonstrating the coil antenna used when switching a switch
  • the figure for demonstrating the coil antenna used when switching a switch (A) is a plan view of the electronic apparatus according to the embodiment, (B) is a cross-sectional view taken along the line AA in (A), and (C) is an enlarged view in the broken line region of (B).
  • FIG. 1 is a diagram illustrating a configuration of an electronic device according to the present embodiment.
  • the electronic device is, for example, a smartphone, a tablet terminal, a notebook PC, a camera, a game machine, a toy, or the like.
  • the electronic device has a coil antenna 10.
  • the coil antenna 10 is formed by connecting an inner peripheral coil 11 and an outer peripheral coil 12 in series.
  • the inner peripheral coil 11 is an example of an “inner peripheral coil portion” according to the present invention.
  • the outer peripheral coil 12 is an example embodiment that corresponds to the “outer coil portion” according to the present invention.
  • the inner peripheral coil 11 is a rectangular spiral coil conductor pattern in plan view.
  • the inner peripheral end E11 of the inner peripheral coil 11 is also one end of the coil antenna 10.
  • the outer peripheral coil 12 is a coil conductor pattern having a rectangular spiral shape in plan view wound around the outer peripheral coil 11 in the same direction as the inner peripheral coil 11 starting from the outer peripheral end of the inner peripheral coil 11.
  • the outer peripheral end E12 of the outer peripheral coil 12 is also the other end of the coil antenna 10.
  • the connection point between the outer peripheral end of the inner peripheral coil 11 and the inner peripheral end of the outer peripheral coil 12 is a connection point E13.
  • the coil antenna 10 is configured to spread in a planar shape (single-layer spiral structure), but it may be a multilayer spiral structure.
  • the coil antenna 10 thus formed is a power receiving antenna or a power transmitting antenna used in a magnetic contactless power transmission system such as an electromagnetic induction power transmission system or a magnetic resonance power transmission system.
  • the contactless power transmission system is used near 6.78 MHz or at a frequency of 110 kHz to 205 kHz.
  • the magnetic field type non-contact power transmission system performs power transmission by coupling with a power transmission partner by magnetic field coupling. This power transmission system is used to charge electronic devices such as smartphones.
  • the non-contact power transmission system is an example of the “first non-contact transmission system” in the present invention.
  • Each of the inner peripheral coil 11 and the outer peripheral coil 12 is an antenna used for a communication system such as a short-range wireless communication system.
  • the short-range wireless communication system is, for example, a system using NFC (Near Field Communication).
  • the short-range wireless communication system is used in the HF band, particularly in the vicinity of 13.56 MHz.
  • the short-range wireless communication system communicates with a transmission partner by magnetic field coupling.
  • a communication system using NFC is an example of the “second contactless transmission system” in the present invention.
  • the electronic device includes three antennas: a coil antenna 10 for a magnetic field type non-contact power transmission system, and an inner coil 11 and an outer coil 12 for a communication system.
  • the inner peripheral end E11 of the inner peripheral coil 11 is connected to the first end of the input / output end of the first system circuit 1 via the capacitor C1.
  • An outer peripheral end E12 of the outer peripheral coil 12 is connected to a second end of the input / output end of the first system circuit 1.
  • a resonance circuit is configured by the capacitor C1 and the coil antenna 10 (inner coil 11 and outer coil 12). The resonance frequency of this resonance circuit is around 6.78 MHz, or 110 kHz to 205 kHz.
  • the first system circuit 1 is, for example, a power transmission circuit or a power reception circuit for a contactless power transmission system.
  • the first system circuit 1 is configured as a semiconductor integrated circuit chip.
  • the first system circuit 1 is an example of the “first contactless transmission system circuit” according to the present invention.
  • the capacitor C1 may be connected in parallel to the coil antenna 10.
  • the inner peripheral end E11 of the inner peripheral coil 11 and the outer peripheral end E12 of the outer peripheral coil 12 are connected to the switch 3.
  • the switch 3 is connected to the first end of the input / output end of the second system circuit 2.
  • a connection point E13 between the inner peripheral coil 11 and the outer peripheral coil 12 is connected to a second end of the input / output end of the second system circuit 2.
  • the second system circuit 2 is an NFC power supply circuit such as a balanced input / output HF band IC.
  • the second system circuit 2 is configured as a semiconductor integrated circuit chip.
  • the second system circuit 2 is an example of the “circuit for the second non-contact transmission system” according to the present invention.
  • a capacitor C2 is connected to the inner peripheral end E11 and the connection point E13 of the inner peripheral coil 11.
  • the capacitor C2 and the inner peripheral coil 11 constitute a resonance circuit.
  • the resonance frequency of this resonance circuit is around 13.56 MHz.
  • a capacitor C3 is connected to the outer peripheral end E12 and the connection point E13 of the outer peripheral coil 12.
  • the capacitor C3 and the outer peripheral coil 12 constitute a resonance circuit.
  • the resonance frequency of this resonance circuit is also around 13.56 MHz.
  • the switch 3 is switching-controlled by a control circuit 4 described later.
  • the switch 3 connects one of the inner peripheral end E11 of the inner peripheral coil 11 or the outer peripheral end E12 of the outer peripheral coil 12 and the second system circuit 2 or the second system circuit 2 is connected to the inner peripheral end. Shut off from both E11 and the outer peripheral end E12.
  • the switch 3 may be built in a semiconductor integrated circuit chip constituting the second system circuit 2 or may be provided independently.
  • the inner peripheral coil 11 When the switch 3 connects the inner peripheral end E11 of the inner peripheral coil 11 and the second system circuit 2, the inner peripheral coil 11 is connected to the second system circuit 2 as shown in FIG. And the inner peripheral coil 11 is used as a coil antenna of a communication system.
  • the switch 3 connects the outer peripheral end E12 of the outer coil 12 and the second system circuit 2
  • the outer coil 12 is connected to the second system circuit 2 as shown in FIG.
  • the outer periphery coil 12 is used as a coil antenna of a communication system.
  • the coil antenna 10 is connected to the first system circuit 1 as shown in FIG. And the coil antenna 10 is used as a coil antenna of a non-contact electric power transmission system.
  • the switch 3 it can be selected whether the coil antenna used in the communication system is the inner coil 11 or the outer coil 12.
  • the diameter of the inner peripheral coil 11 is smaller than the diameter of the outer peripheral coil 12. That is, the coil antenna can be switched to either the inner peripheral coil 11 or the outer peripheral coil 12 according to the position or size of the coil antenna of the transmission partner. As a result, an optimal communication state with the transmission partner can be maintained. Further, by appropriately changing the size of the coil antenna, it is possible to avoid deterioration of communication characteristics due to the null point.
  • the configuration including the coil antenna 10 and the switch 3 is an example of the “antenna device” according to the present invention.
  • the control circuit 4 switches the switch 3 so that the communication state between the electronic device and its transmission partner is optimal, and the inner peripheral coil 11 or the outer peripheral coil 12 becomes the coil antenna of the communication system.
  • the leakage flux may increase. In this case, the coupling between the electronic device and the transmission partner is weak, and communication is not stable.
  • the control circuit 4 detects the transmission degree (transmission coefficient and transmission coefficient) between the electronic device and the transmission partner when the inner peripheral coil 11 and the outer peripheral coil 12 are coil antennas.
  • the degree of transmission can be detected by transmission voltage, transmission power, etc. during transmission.
  • the control circuit 4 compares the two detected transmission rates, and switches the switch 3 so that the inner coil 11 or the outer coil 12 having the higher transmission rate is used as a coil antenna in the transmission system.
  • the degree of coupling with the transmission partner changes, and the transmission degree changes.
  • the inner coil 11 or the outer coil 12 that is suitable for the current transmission state is selected.
  • the electronic device can perform stable communication with the transmission partner.
  • the switching between the inner peripheral coil 11 or the outer peripheral coil 12 may be constantly changed every certain period. In this case, detection and control of the communication status with the transmission partner is not necessary, and the circuit configuration can be simplified.
  • the control circuit 4 may be configured as a one-chip IC together with the switch 3 and the second system circuit 2. Further, it may be configured as a one-chip IC including the first system circuit 1.
  • the switch 3 When operating as a non-contact power transmission system, the switch 3 blocks the connection between the inner coil 11 and the outer coil 12 with the second system circuit 2.
  • a switch may be provided between the system 1 and the circuit 1. In this case, when operating as a communication system, the first system circuit 1 side can be shut off by turning off the switch.
  • a capacitor for forming a resonance circuit may be connected in parallel or in series to the coil antenna 10 used in the non-contact power transmission system, the inner peripheral coil 11 or the outer peripheral coil 12 used in the communication system. .
  • FIG. 5A is a plan view of the electronic apparatus 200 according to the present embodiment
  • FIG. 5B is a cross-sectional view taken along the line AA in FIG. 5A
  • FIG. It is an enlarged view in the broken-line area
  • An electronic apparatus 200 shown in FIGS. 5A to 5C includes a housing 201, a coil antenna 10, a display device 202, a battery pack 203, a circuit board 204, a first system circuit 1, and a second system circuit. 2 etc. are provided.
  • the housing 201 has a rectangular parallelepiped shape in plan view. As shown in FIG. 5B, the casing 201 houses the coil antenna 10, the display device 202, the battery pack 203, the circuit board 204, the first system circuit 1, the second system circuit 2, and the like. Has been.
  • the housing 201 is, for example, a resin case
  • the circuit board 204 is, for example, a printed wiring board
  • the display device 202 is, for example, an LCD panel.
  • a coil antenna 10 is affixed to the inner upper surface of the housing 201.
  • the coil antenna 10 further has a magnetic plate 205.
  • the magnetic plate 205 is a thin plate having a rectangular planar shape. As shown in FIG. 5B, the inner peripheral coil 11 and the outer peripheral coil 12 are formed on the surface of the magnetic plate 205.
  • the magnetic plate 205 is a ceramic flat plate such as a magnetic ferrite ceramic, or a resin plate containing ferrite powder in which magnetic ferrite powder is dispersed in a resin.
  • the planar shape of the magnetic plate 205 is not limited to a rectangle, and can be changed as appropriate.
  • a display device 202 is fitted on the lower surface of the housing 201.
  • a battery pack 203, a circuit board 204, and the like are provided on the surface of the display device 202.
  • An IC chip, a capacitor chip, and the like are mounted on the main surface of the circuit board 204 to constitute the first system circuit 1 and the second system circuit 2.
  • the first system circuit 1 is connected to the inner coil 11 via a movable probe pin or flexible cable (not shown), and the second system circuit 2 is connected via a movable probe pin or flexible cable (not shown). Connected to the outer coil 12.
  • an electronic device including the coil antenna 10 that suppresses the interaction (interference) between the inner peripheral coil 11 and the outer peripheral coil 12 can be realized.
  • the end portions of the inner peripheral coil 11 and the outer peripheral coil 12 are not necessarily close to the innermost periphery or the outermost periphery.
  • the present embodiment has been described as a portable terminal, it may be a stationary electronic device.
  • the electronic device in the non-contact power transmission system, the electronic device is on the power transmission side.

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  • Near-Field Transmission Systems (AREA)

Abstract

Dans un dispositif d'antenne comprenant une antenne à cadre spiralée (10) et utilisé à la fois dans un premier système de transmission sans contact et dans un second système de transmission sans contact, l'antenne à cadre (10) présente une bobine périphérique interne (11) et une bobine périphérique externe (12) connectées en série. Une extrémité périphérique interne (E11) de la bobine périphérique interne (11) est connectée à une première extrémité d'un premier circuit de système (1) et une extrémité périphérique externe (E12) de la bobine périphérique externe (12) est connectée à une seconde extrémité du premier circuit de système (1). Une section de connexion entre la bobine périphérique interne (11) et la bobine périphérique externe (12) est connectée à une première extrémité d'un second circuit de système (2) et comprend un commutateur (3) connectant l'extrémité périphérique interne (E11) de la bobine périphérique interne (11) ou l'extrémité périphérique externe (E12) de la bobine périphérique externe (12) à une seconde extrémité du second circuit de système (2).
PCT/JP2016/086969 2016-01-13 2016-12-13 Dispositif d'antenne et dispositif électronique WO2017122480A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201690001351.7U CN208589547U (zh) 2016-01-13 2016-12-13 天线装置以及电子设备

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2016-004209 2016-01-13
JP2016004209 2016-01-13

Publications (1)

Publication Number Publication Date
WO2017122480A1 true WO2017122480A1 (fr) 2017-07-20

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PCT/JP2016/086969 WO2017122480A1 (fr) 2016-01-13 2016-12-13 Dispositif d'antenne et dispositif électronique

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CN (1) CN208589547U (fr)
WO (1) WO2017122480A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20190067798A1 (en) * 2017-08-29 2019-02-28 Samsung Electronics Co., Ltd. Housing of electronic device and electronic device

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP7021657B2 (ja) * 2019-03-22 2022-02-17 オムロン株式会社 Ｒｆタグ

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2012070529A (ja) * 2010-09-24 2012-04-05 Nec Tokin Corp 非接触電力伝送および通信システム
US20150318710A1 (en) * 2012-12-13 2015-11-05 Lg Innotek Co., Ltd. Wireless power receiver and method of controlling the same

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2012070529A (ja) * 2010-09-24 2012-04-05 Nec Tokin Corp 非接触電力伝送および通信システム
US20150318710A1 (en) * 2012-12-13 2015-11-05 Lg Innotek Co., Ltd. Wireless power receiver and method of controlling the same

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20190067798A1 (en) * 2017-08-29 2019-02-28 Samsung Electronics Co., Ltd. Housing of electronic device and electronic device
US10790574B2 (en) * 2017-08-29 2020-09-29 Samsung Electronics Co., Ltd. Housing of electronic device and electronic device

Also Published As

Publication number Publication date
CN208589547U (zh) 2019-03-08

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