CN210142721U

CN210142721U - Antenna device and electronic apparatus

Info

Publication number: CN210142721U
Application number: CN201920052014.6U
Authority: CN
Inventors: 市川敬一
Original assignee: Murata Manufacturing Co Ltd
Current assignee: Murata Manufacturing Co Ltd
Priority date: 2015-11-30
Filing date: 2016-11-10
Publication date: 2020-03-13
Anticipated expiration: 2026-11-10
Also published as: JPWO2017094466A1; JP2019022238A; JP6436246B2; WO2017094466A1; JP6610752B2; CN208423175U

Abstract

The utility model provides an antenna device and possess this antenna device's electronic equipment. The utility model discloses an antenna device possesses: a first antenna of a first contactless transmission system having a first coil with a first coil opening; and a second antenna of a second non-contact transmission system having a second coil and a third coil, the second coil having a second coil opening, the third coil being connected in series with the second coil and having a third coil opening, the first coil opening and the third coil opening being located inside the second coil opening and the third coil opening being located outside the first coil opening in a plan view of the second coil, and the circulating directions of currents flowing through the second coil and the third coil being the same direction in the plan view of the second coil.

Description

Antenna device and electronic apparatus

This application is a divisional application, and its original application is the utility model application that international application date is 2016 10 months 11 days, and international application number is PCT/JP2016/083308 and the international application number gets into the national stage in 2018 month 5 and 18 days, and national application number is 201690001360.6, and the utility model name is "antenna device and electronic equipment".

Technical Field

The present invention relates to an antenna device for a plurality of noncontact transmission systems and an electronic apparatus provided with the antenna device.

Background

As a conventional antenna device, there is an antenna device described in patent document 1. The antenna device includes a coil for proximity communication, a coil for power transmission, and a metal plate. In a plan view of the main surface of the metal plate, a proximity communication coil is disposed at a first end of the metal plate in the longitudinal direction, and a power transmission coil is disposed at a second end of the metal plate in the longitudinal direction. The coil for proximity communication and the coil for power transmission are magnetically coupled to the metal plate. The metal plate functions as a radiation element of a proximity communication system and a power transmission system.

Prior art documents

Patent document

Patent document 1: international publication No. 2014/167881

SUMMERY OF THE UTILITY MODEL

Problem to be solved by utility model

In the antenna device described in patent document 1, the proximity communication coil is distant from the power transmission coil. Therefore, the coil for proximity communication and the coil for power transmission are difficult to be coupled to each other by a magnetic field, and the size of the antenna device increases.

An object of the present invention is to provide a small and thin antenna device in which interaction between antennas for non-contact transmission is suppressed, and an electronic apparatus including the antenna device.

Means for solving the problems

(1) The utility model discloses an antenna device possesses:

a first antenna of a first contactless transmission system having a first coil opening; and

a second antenna of the second non-contact transmission system having a second coil opening and a third coil connected in series with the second coil and having a third coil opening,

the first coil opening and the third coil opening are located inside the second coil opening and the third coil opening is located outside the first coil opening in a plan view of the second coil,

in a plan view of the second coil, the current flowing through the second coil and the third coil has the same direction of circulation.

(2) Preferably, the third coil has a third coil opening having an area smaller than the second coil opening in a plan view of the first coil opening. According to this structure, it is difficult for the third coil to be coupled with the coil on the partner side of the second noncontact transmission. Therefore, the third coil does not interfere with the coupling between the coil of the second antenna and the coil of the counterpart side, and therefore the coil of the second antenna and the coil of the counterpart side can be strongly coupled.

(3) The antenna device of the present invention may further include a magnetic body that overlaps the third coil when the first coil opening is viewed in plan. In this structure, the inductance of the second antenna can be adjusted. Furthermore, by increasing the coupling of the first coil and the third coil, the interaction of the first antenna and the second antenna can be adjusted.

(4) The magnetic body may overlap the first coil when the first coil opening is viewed in plan. In this structure, the inductance of the second antenna can be adjusted. Furthermore, by further improving the coupling of the first coil and the third coil, the interaction of the first antenna and the second antenna can be adjusted.

(5) The antenna device of the present invention may be provided with a plurality of third coils having different winding axes. In this structure, the inductance of the second antenna can be adjusted. Furthermore, by increasing the coupling of the first coil and the third coil, the interaction of the first antenna and the second antenna can be adjusted.

(6) For example, the first contactless transmission system is a power transmission system, and the second contactless transmission system is a communication system. In this configuration, for example, non-contact charging and NFC (Near field Communication) can be performed.

(7) For example, the first contactless transmission system is a communication system, and the second contactless transmission system is a power transmission system.

(8) The power transmission system is, for example, a magnetic field resonance power transmission system.

(9) The communication system is, for example, a short-range wireless communication system.

(10) The utility model discloses an electronic equipment possesses antenna device, and antenna device has:

Effect of the utility model

According to the present invention, the interaction between the antennas for each non-contact transmission can be suppressed, and the antenna device can be miniaturized and thinned.

Drawings

Fig. 1 is a schematic plan view of an antenna device according to a first embodiment.

Fig. 2 is a schematic top view illustrating magnetic field coupling of the coil antenna 11 and the coil antenna 12.

Fig. 3 is a schematic plan view of an antenna device according to a second embodiment.

Fig. 4 is a schematic plan view of an antenna device according to a third embodiment.

Fig. 5 is a schematic plan view of an antenna device according to a fourth embodiment.

Fig. 6 is a schematic top view illustrating magnetic field coupling of the coil antenna 41 and the coil antenna 42.

Fig. 7 is a block diagram of an electronic apparatus according to a fifth embodiment.

Description of the reference numerals

Comm1, Comm 2: communication device, Cr 1: power receiving resonance capacitor, Cr2, Cr 4: capacitor, Cr 3: power transmission resonance capacitor, L1: power receiving coil, L2, L4: communication coil, L3: power transmission coil, Rxp: power receiving device, Txp: power transmission device, 10: antenna device, 11: coil antenna (first antenna), 12: coil antenna (second antenna), 32, 41, 42: coil antenna, 13: coil (first coil), 14: coil (second coil), 15: coil (third coil), 35, 43, 44, 45: coil, 26, 36: magnetic sheet, 50: electronic device, 51: power receiving resonance mechanism, 52: power receiving circuit, 53: load, 54, 64: LC resonant circuit, 55, 65: transmitting-receiving circuit, 61: power transmission resonance mechanism, 62: power transmission circuit, 63: input power supply, 521: rectifying and smoothing circuit, 621: control circuit unit, 622: a power circuit section.

Detailed Description

A plurality of embodiments for carrying out the present invention will be described below with reference to the drawings and specific examples. In the drawings, the same reference numerals are given to the same parts. The embodiments are separately shown for convenience in view of ease of explanation or understanding of the points, but partial replacement or combination of the structures shown in different embodiments is possible. In the second and subsequent embodiments, descriptions of common matters with the first embodiment will be omitted, and only differences will be described. In particular, the same operational effects based on the same structure will not be mentioned successively in each embodiment.

First embodiment

Fig. 1 is a schematic plan view of an antenna device 10 according to a first embodiment. The antenna device 10 is mounted on an electronic apparatus such as a smartphone. The antenna device 10 includes

coil antennas

11 and 12. The coil antenna 11 is a power receiving antenna and is used in a magnetic field type non-contact power transmission system such as an electromagnetic induction power transmission system and a magnetic resonance power transmission system. For example, magnetic field resonance power transmission systems are used in the HF band, particularly at frequencies around 6.78 MHz. Further, the magnetic field type non-contact power transmission system performs power transmission with a power transmission partner by magnetic field coupling. Power transmission systems are used, for example, to charge electronic devices such as smart phones. The coil antenna 12 is used in a communication system such as a short-range wireless communication system. The Near field Communication system is, for example, a system using NFC (Near field Communication). For example, short-range wireless communication systems are used in the HF band, in particular, at frequencies around 13.56 MHz. Further, the short-range wireless communication system communicates with a communication partner by magnetic field coupling. The coil antenna 11 is an example of the "first antenna" of the present invention. The coil antenna 12 is an example of the "second antenna" of the present invention. The system using NFC is an example of the "first contactless transmission system" of the present invention. The power transmission system is an example of the "second contactless transmission system" of the present invention.

The electronic device to which the antenna device 10 is attached may be, for example, a mobile phone such as a functional phone, a wearable terminal such as a PDA, smart glasses, and a smart watch, a notebook PC, a tablet terminal, a camera, a game machine, a toy, and the like. The coil antenna 11 may be a power transmission antenna. The coil antenna 11 may be used for a communication system, and the coil antenna 12 may be used for a power transmission system. The coil antenna 11 and the coil antenna 12 may be used for both mutually different communication systems, and may also be used for both mutually different power transmission systems. The

coil antennas

11 and 12 may be used in systems other than the communication system and the power transmission system.

The coil antenna 11 has a coil 13. The coil antenna 12 has

coils

14, 15. The coil 13 is an example of the "first coil" of the present invention. The coil 14 is an example of the "second coil" of the present invention. The coil 15 is an example of the "third coil" of the present invention. The coil 15 has an asymmetrical shape with the coil 14. The coil 14 is magnetically coupled to the coil 13. The coil 15 is magnetically coupled to the coil 13 and the coil 14. As described later, when the coupling of the coil 13 and the coil 14 is defined as the coupling in the positive direction, the coil 15 and the coil 13 are coupled in the negative direction and are coupled in the direction of increasing the inductance of each other with the coil 14.

The

coil antennas

11 and 12 are formed of conductor patterns and interlayer connection conductors formed on the coil substrate. The coil substrate is a planar flexible substrate. The coils 13-15 are formed on the same main surface of the coil substrate. The winding axes of the coils 13 to 15 are parallel to each other. The

coil antennas

11 and 12 are disposed between a case of the electronic device accommodating the

coil antennas

11 and 12 and a circuit board, a battery pack, and the like on which control circuit components and the like of the electronic device are mounted. The antenna device on the other side is disposed on the opposite side of the housing from the

coil antennas

11 and 12 during power transmission or communication. Further, a magnetic sheet may be disposed between the

coil antennas

11 and 12 and the circuit board, the battery pack, or the like. This can reduce a decrease in inductance of the

coil antennas

11 and 12 due to the proximity of the

coil antennas

11 and 12 to the circuit board, the battery pack, and the like, and unnecessary loss in the conductor of the circuit board. Further, the influence of an unnecessary electromagnetic field radiated from the circuit board on power transmission or communication can be suppressed.

The coil openings of the coils 13-15 are rectangular. The coil opening of the coil 13 is an example of the "first coil opening" of the present invention. The coil opening of the coil 14 is an example of the "second coil opening" of the present invention. The coil opening of the coil 15 is an example of the "third coil opening" of the present invention. The area of the coil opening surface of the coil 14 is larger than that of the coil opening surface of the coil 15. The shape or size of the coil opening of the coil 15 is different from the shape or size of the coil opening of the coil 14. The area of the coil opening surface of the coil 13 is substantially the same as the area of the coil opening surface of the coil antenna on the power transmission side. The area of the coil opening surface of the coil 14 is substantially the same as the area of the coil opening surface of the coil antenna on the communication partner side. The area of the coil opening surface of the coil 15 is sufficiently smaller than the area of the coil opening surface of the coil antenna on the communication partner side.

The coil 14 and the coil 15 are connected in series. The coil 14 and the coil 15 are connected in an 8-shape in a plan view (a plan view of a coil opening of the coil). The current flowing through the

coils

14 and 15 is circulated in opposite directions. In a region where the wirings cross each other in a plan view, the wirings are formed using interlayer connection conductors such that one wiring bypasses the other wiring in a direction normal to the main surface of the coil substrate. The number of turns of coil 15 is greater than the number of turns of coil 14. In fig. 1, the winding structure of the coils 13 to 15 is omitted and shown. The end of the coil 13 is connected to the power receiving circuit via a matching circuit. The end of the 8-shaped coil formed of the coil 14 and the coil 15 is connected to a transmission/reception circuit via a matching circuit.

The formation regions of the

coils

14 and 15 are located inside the formation region of the coil 13 in a plan view. The coil openings of the

coils

14 and 15 overlap the coil opening of the coil 13 in a plan view. The

coils

14 and 15 are formed in the coil openings of the coil 13 in a plan view. The conductor of the coil 13 and the conductors of the

coils

14 and 15 do not overlap in a plan view. The coil 15 is disposed close to a part of the conductor of the coil 13. The coil 15 is disposed at the edge of the coil opening of the coil 13. The distance between the coil 13 and the coil 15 is shorter than the distance between the coil 13 and the coil 14. The formation region of the coil 15 is located outside the formation region of the coil 14 in a plan view. The coil opening of the coil 15 does not overlap with the coil opening of the coil 14 in a plan view.

Fig. 2 is a schematic top view illustrating magnetic field coupling of the coil antenna 11 and the coil antenna 12. I represents a current flowing through the coil 13 in the first loop direction₁I represents a current flowing through the coil 14 in the first winding direction₂I represents a current flowing through the coil 15 in a second winding direction (a direction opposite to the first winding direction)₃. Further, in fig. 6, the current i is illustrated₂The generated magnetic field.

If a current i flows₂The flow is too largeSmall sum current i₂Same current i₃. The coil 13 and the coil 14 are coupled based on the current i₁And a current i₂Based on the current i in the case that the magnetic fluxes of (c) are added to each other₁And a current i₃The magnetic fluxes cancel each other out. Therefore, the mutual inductance M between the

coils

13 and 14₁₂And mutual inductance M between coils 13 and 15₁₃With opposite signs to each other. In addition, based on the current i₂And a current i₃Are added to each other. Therefore, if the mutual inductance M between the

coils

14 and 15 is set₂₃Is positive, let the self-inductance of the coil 14 be L₂And the self-inductance of the coil 15 is L₃The combined inductance of the coil 14 and the coil 15 becomes L₂+L₃+2M₂₃. Therefore, the coil 14 and the coil 15 perform magnetic field coupling, so that the inductance of the coil antenna 12 is increased.

The mutual inductance M between the coil antenna 11 and the coil antenna 12 is the mutual inductance M₁₂And mutual inductance M₁₃And (4) summing. As described above, the mutual inductance M₁₂And mutual inductance M₁₃With opposite signs to each other. Therefore, the magnitude of the mutual inductance M is due to the mutual inductance M₁₂Is mutually inducted M₁₃Cancel out and become smaller. Therefore, the degree of magnetic field coupling between the coil antenna 11 and the coil antenna 12 is reduced.

This result can be also described by considering the magnetic field generated by the coil antenna 12 at the coils 13 to 15. That is, regarding the magnetic field generated by the coil antenna 12, the magnetic field in the Z-axis direction generated at the coil opening of the coil 14 (the normal direction of the coil opening surface of the coil) and the magnetic field in the Z-axis direction generated at the coil opening of the coil 15 are opposite directions. Therefore, the Z-axis component of the magnetic field generated at the coil opening of the coil 14 and the Z-axis component of the magnetic field generated at the coil opening of the coil 15 cancel each other out, and therefore the magnitude of the magnetic flux passing through the coil opening face of the coil 13 becomes small. As a result, the degree of magnetic field coupling between the coil antenna 11 and the coil antenna 12 is reduced.

In the first embodiment, the coil antenna 12 is disposed inside the coil antenna 11 in a plan view, and therefore the antenna device can be downsized. The conductor of the coil 13 and the conductors of the

coils

14 and 15 do not overlap in a plan view. Therefore, it is not necessary to dispose the coil antenna 11 and the coil antenna 12 in different layers from each other, and therefore the antenna device can be made thin. Further, as described above, the degree of magnetic field coupling between the coil antenna 11 and the coil antenna 12 is reduced, and therefore the interaction between the power transmission system and the communication system can be suppressed.

In general, the larger the area of the coil opening surface of each coil that is magnetically coupled to each other, the larger the mutual inductance. The more the number of turns of each coil that are magnetically coupled to each other, the larger the mutual inductance. The shorter the distance between the coils that are magnetically coupled to each other, the larger the mutual inductance. In the first embodiment, as described above, the area of the coil opening surface of the coil 14 is larger than the area of the coil opening surface of the coil 15. On the other hand, the number of turns of the coil 15 is larger than that of the coil 14. The distance between the coil 13 and the closest portion of the coil 15 is shorter than the distance between the coil 13 and the closest portion of the coil 14. Thereby, mutual inductance M₁₂And mutual inductance M₁₃Are determined to be approximately equal in size to each other. Therefore, the magnitude of the mutual inductance between the

coil antennas

11 and 12 can be effectively reduced. The number of turns and arrangement of each coil are not limited to those described above, and may be appropriately determined so that the mutual inductance M is set₁₂、M₁₃Are balanced against each other.

As described above, the area of the coil opening surface of the coil 14 is substantially the same as the area of the coil opening surface of the coil antenna on the communication partner side. Therefore, at the time of communication, the area of the coil opening of the coil 14 facing the coil opening of the coil antenna on the communication partner side is increased, and therefore the coil 14 and the coil antenna on the communication partner side are strongly coupled in a magnetic field. On the other hand, as described above, the area of the coil opening surface of the coil 15 is sufficiently smaller than the area of the coil opening surface of the coil antenna on the other side. Therefore, at the time of communication, the facing area of the coil opening of the coil 15 and the coil opening of the coil antenna on the communication partner side is small, and therefore the coil 15 and the coil antenna on the communication partner side hardly perform magnetic field coupling. As a result, the third coil hardly interferes with the magnetic field coupling of the coil antenna 12 and the coil antenna on the communication partner side. Therefore, the decrease in the reception range of the antenna device can be suppressed.

Second embodiment

In the second embodiment, the magnetic sheet is provided so as to overlap the first coil and the third coil in a plan view. Fig. 3 is a schematic plan view of an antenna device according to a second embodiment. The magnetic sheet 26 is disposed so as to cover the coil opening of the coil 15 and the conductor of the coil 13 close to the coil 15 in a plan view. The magnetic sheet 26 is disposed so as to cover a region where the coil 15 and the conductor of the coil 13 are close to each other in a plan view. The magnetic sheet 26 does not overlap the coil opening of the coil 14 in a plan view. The magnetic sheet 26 is disposed so as to be positioned between the

coil antennas

11 and 12 and the coil antenna on the communication partner side during communication. The

coil antennas

11 and 12 and a circuit board, a battery pack, and the like on which control circuit components and the like of the electronic device are mounted. Instead of disposing the magnetic material sheet, another member (magnetic member, conductive member) such as a conductor sheet capable of controlling the magnetic field coupling between the coil 13 and the coil 15 may be used. By disposing a conductor piece between the housing and the coil 15, direct coupling between the coil 15 and the antenna device on the other side is suppressed.

In the second embodiment, the magnetic sheet 26 confines the magnetic field generated by the coil 15 to the peripheral region of the coil 15. Therefore, the magnetic field coupling degree of the coil 13 and the coil 15 is enhanced. This makes it possible to adjust the degree of magnetic field coupling between the coil antenna 11 and the coil antenna 12.

The magnetic sheet 26 suppresses the magnetic field generated by the coil 15 during communication from spreading in the direction in which the coil antenna on the communication partner side is arranged. Therefore, the degree of magnetic field coupling between the coil 15 and the coil antenna on the communication partner side is reduced, and therefore the influence of the coil 15 on the communication can be reduced.

Further, by disposing the magnetic sheet 26, the shape of the coil 15 can be reduced while maintaining the degree of magnetic field coupling between the coil 13 and the coil 15. This can further reduce the degree of magnetic field coupling between the coil 15 and the coil antenna on the communication partner side. In addition, in the same region, the shape of the coil 14 can be increased by the amount by which the shape of the coil 15 can be reduced, and the degree of magnetic field coupling between the coil 14 and the coil antenna on the communication partner side can be further improved. This can further improve the degree of magnetic field coupling between the coil antenna 12 and the coil antenna on the communication partner side.

Third embodiment

In the third embodiment, a plurality of third coils having different winding axes are provided. Fig. 4 is a schematic plan view of an antenna device according to a third embodiment. The coil antenna 32 includes coils 15 and 35 (third coils) and

magnetic material sheets

26 and 36. The coil 35 is configured similarly to the coil 15. The magnetic sheet 36 is configured similarly to the magnetic sheet 26. The coil 35 is connected in series with the coil 14, similarly to the coil 15. The winding axis of the coil 35 is different from the winding axis of the coil 15. The coil 35 and the magnetic material pieces 36 are arranged so that the coil 15 and the magnetic material pieces 26 are rotated by 180 ° around the center of gravity of the coil 14 in a plan view. The coil opening of the coil antenna 32 is two-fold symmetric with respect to a rotation around its center of gravity in a plan view. The coil 14 is disposed so as to be line-symmetric with respect to an axis passing through the center of gravity of the coil in a plan view. The coil opening of the coil antenna 32 is line-symmetric in a plan view. The center of gravity here means the geometric center of gravity.

In the third embodiment, the mutual inductance M can be equivalently increased by providing the coil 35₁₃(see fig. 2). This makes it possible to adjust the degree of magnetic field coupling between the coil antenna 11 and the coil antenna 12. The coil opening of the coil antenna 32 is provided so as to have good symmetry in a plan view. Therefore, the magnetic field generated by the coil antenna 32 is well expanded in symmetry.

Fourth embodiment

In the fourth embodiment, the formation regions of the first coil and the third coil are located inside the formation region of the second coil in a plan view. The formation region of the third coil is located outside the formation region of the first coil, and the directions of current flowing through the second coil and the third coil are the same. Fig. 5 is a schematic plan view of an antenna device according to a fourth embodiment. The coil antenna 41 has a coil 43 (first coil). The coil antenna 42 has a coil 44 (second coil) and a coil 45 (third coil). The formation region of the

coils

43 and 45 is located inside the formation region of the coil 44 in a plan view. The formation region of the coil 45 is located outside the formation region of the coil 43. The coil 44 and the coil 45 are connected in series. The current flowing through the

coils

44 and 45 flows in the same direction. In the fourth embodiment, a magnetic sheet may be provided as in the second embodiment.

Fig. 6 is a schematic top view illustrating magnetic field coupling of the coil antenna 41 and the coil antenna 42. I represents a current flowing through the coil 43 in the first loop direction₁I represents a current flowing through the coil 44 in the first winding direction₂I represents a current flowing through the coil 45 in the first winding direction₃. Further, in fig. 6, the current i is illustrated₁The generated magnetic field.

If a current i flows₂Then a magnitude and a current i flow₂Same current i₃. Coupling between coil 43 and coil 44 is made based on current i₁And a current i₂Based on the current i in the case that the magnetic fluxes of (c) are added to each other₁And a current i₃The magnetic fluxes cancel each other out. Therefore, the mutual inductance M between the

coils

43 and 44₁₂And mutual inductance M between coils 43 and 45₁₃With opposite signs to each other. In addition, based on the current i₂And a current i₃Are added to each other. Therefore, if the mutual inductance M between the

coils

44 and 45 is set₂₃Is positive and the self-inductance of the coil 44 is set to L₂And the self-inductance of the coil 45 is set to L₃The combined inductance of the coil 44 and the coil 45 becomes L₂+L₃+2M₂₃. Therefore, the coil 44 and the coil 45 perform magnetic field coupling, so that the inductance of the coil antenna 42 is increased. The magnitude of mutual inductance between the coil antenna 41 and the coil antenna 42 is due to the mutual inductance M₁₂And mutual inductance M₁₃Cancel each other out and become smaller. As a result, the degree of magnetic field coupling between the coil antenna 41 and the coil antenna 42 is reduced.

This result can be also explained by considering the magnetic field generated by the coil antenna 41 in the coils 43 to 45. That is, regarding the magnetic field generated by the coil antenna 41, the magnetic field in the Z-axis direction generated at the coil opening of the coil 43 (the normal direction of the coil opening surface of the coil) and the magnetic field in the Z-axis direction generated at the coil opening of the coil 45 are opposite directions. Therefore, the Z-axis component of the magnetic field generated at the coil opening of the coil 43 and the Z-axis component of the magnetic field generated at the coil opening of the coil 45 cancel each other out, and therefore the magnitude of the entire magnetic flux passing through the coil opening surfaces of the

coils

44 and 45 becomes small. As a result, the degree of magnetic field coupling between the coil antenna 41 and the coil antenna 42 is reduced.

Fifth embodiment

Fig. 7 is a block diagram of an electronic apparatus according to a fifth embodiment. The electronic apparatus 50 includes a power receiving device Rxp and a communication device Comm 1. The power receiving device Rxp and the power transmitting device Txp together constitute a magnetic resonance power transmission system. The communication device Comm1 and the communication device Comm2 together form a near field communication system using NFC.

The power receiving device Rxp includes: a power receiving coil L1; a power receiving resonant capacitor Cr1 that constitutes a power receiving resonant mechanism 51 together with the power receiving coil L1; and a power receiving circuit 52 electrically connected to the power receiving resonance mechanism 51 and configured to supply power to a load. The powered circuitry 52 processes power in the HF band at 6.78MHz, for example. Both ends of the power receiving coil L1, which function as coils to perform electric functions, are connected to the power receiving circuit 52. The power transmission device Txp includes: power transmission coil L3; a power transmission resonant capacitor Cr3 that constitutes a power transmission resonant mechanism 61 together with the power transmission coil L3; and a power transmission circuit 62 electrically connected to the power transmission resonance mechanism 61, and intermittently supplying a dc input voltage to the power transmission resonance mechanism 61 to generate an ac voltage in the power transmission coil L3. The power transmission circuit 62 processes, for example, power in the HF band at 6.78 MHz. Both ends of power transmission coil L3, which function as coils, are connected to power transmission circuit 62. An input power source 63 is connected to the power transmission device Txp, and a load 53 is connected to the power reception device Rxp, and power is supplied from the power transmission device Txp to the power reception device Rxp. The power receiving circuit 52 includes a rectifying/smoothing circuit 521. The power transmission circuit 62 includes a control circuit portion 621 that converts an input power supply voltage into an alternating voltage, and a power circuit portion 622 that converts the alternating voltage into electric power.

Communication device Comm1 includes: a communication coil L2; a capacitor Cr2 that constitutes the LC resonance circuit 54 together with the communication coil L2; and a transceiver circuit 55 electrically connected to the LC resonant circuit 54 and having a function of outputting a signal to the communication coil L2 or inputting a signal from the communication coil L2. The transceiver circuit 55 processes signals in the HF band of 13.56MHz, for example. Both ends of the communication coil L2 functioning as a coil are connected to the transmission/reception circuit 55. Communication device Comm2 includes: a communication coil L4; a capacitor Cr4 that constitutes the LC resonant circuit 64 together with the communication coil L4; and a transceiver circuit 65 electrically connected to the LC resonant circuit 64 and having a function of outputting a signal to the communication coil L4 or inputting a signal from the communication coil L4. The transceiver circuit 65 processes signals in the HF band of 13.56MHz, for example. Both ends of the communication coil L4 functioning as a coil are connected to the transmission/reception circuit 65. The power receiving coil L1 is a coil antenna for receiving power. The communication coil L2 is a coil antenna for communication. The power receiving coil L1 and the communication coil L2 are provided in the above-described embodiments, for example.

In addition, although the example in which the second coil and the third coil are connected only via the wiring is shown in the above-described embodiment, the second coil and the third coil may be connected via a given circuit.

In the above-described embodiments, the third coil is formed of a conductor pattern on the coil substrate, but the third coil may be formed of an integral component such as a chip component. For example, the first coil and the third coil may be magnetically coupled to each other by forming the third coil from a primary coil of a transformer formed in the chip component and connecting the secondary coil of the transformer to the first coil.

In the above-described embodiment, the first coil, the second coil, and the third coil are each formed in a substantially one-turn loop shape, but the number of turns of each coil is not limited to 1, and may be a plurality of turns.

In the above-described embodiments, the entire one coil antenna is disposed inside the other coil antenna in a plan view, but a part of the one coil antenna may be disposed outside the other coil antenna in a plan view.

In the above-described embodiments, the coil antenna is formed of the conductor pattern and the interlayer connection conductor, but the coil antenna may be formed of a conductive wire.

Claims

1. An antenna device is characterized by comprising:

a first antenna of a first contactless transmission system having a first coil with a first coil opening; and

a second antenna of a second non-contact transmission system having a second coil opening and a third coil connected in series with the second coil and having a third coil opening,

in a plan view of the second coil, the direction of current flowing through the second coil and the third coil is the same.

2. The antenna device of claim 1,

the third coil has a third coil opening that is smaller in area than the second coil opening when the first coil opening is viewed in plan.

3. The antenna device of claim 1,

the antenna device is provided with: and a magnetic body overlapping the third coil when the first coil opening is viewed in plan.

4. The antenna device according to claim 3,

the magnetic body overlaps the first coil when the first coil opening is viewed in plan.

5. The antenna device according to any one of claims 1 to 4,

the antenna device includes a plurality of the third coils having winding axes different from each other.

6. The antenna device according to any one of claims 1 to 4,

the first non-contact transmission system is a power transmission system, and the second non-contact transmission system is a communication system.

7. The antenna device according to any one of claims 1 to 4,

the first contactless transmission system is a communication system, and the second contactless transmission system is a power transmission system.

8. The antenna device according to claim 6,

the power transmission system is a magnetic field resonance power transmission system.

9. The antenna device according to any of claim 6,

the communication system is a short-range wireless communication system.

10. An electronic device, characterized in that,

the antenna device is provided with an antenna device,

the antenna device has: