JP6376314B2 - ANTENNA DEVICE AND ELECTRONIC DEVICE - Google Patents

Description

  The present invention relates to an antenna device that is housed in a casing of an electronic device or includes a part of the casing of the electronic device.

  Patent Document 1 discloses a wireless IC device in which an opening and a slit are provided in a planar conductor of a circuit board, the planar conductor and a coil antenna are coupled, and a conductor pattern is used as a radiator.

International Publication No. 2009/142114

  In an electronic device such as a mobile phone terminal having a function of communicating with a reader / writer, an antenna device is provided in the housing. When communication is performed between such an electronic device and a reader / writer, a user holding the electronic device may be communicated with the electronic device held over a reader / writer reading unit below the line of sight. Many. Therefore, the relationship between the directivity of the antenna device provided in the electronic device and how to hold the electronic device over the reader / writer reading unit is important.

  However, restrictions on the arrangement of the planar conductor and the coil antenna are severe due to the provision of the antenna device in the casing of the electronic device. As a result, the directivity of the antenna device is uniformly determined, and depending on the directivity, it may be necessary to hold the electronic device over the reader / writer in an unreasonable and unreasonable posture.

  An object of the present invention is to provide an antenna device having a desired directivity and an electronic apparatus including the antenna device even when there are restrictions on the arrangement of planar conductors and coil antennas.

(1) The antenna device of the present invention
An antenna device that is housed in a housing of an electronic device or includes a housing of the electronic device in part.
A planar conductor composed of a conductor extending in a planar shape;
A notch formed in the planar conductor and connected to an outer edge of the planar conductor;
A coil antenna having a coil opening overlapping the notch in a plan view of the planar conductor;
A conductive member facing the outer edge of the planar conductor to which the notch is connected in plan view;
With
When viewed in the direction along the surface of the planar conductor, the coil antenna and the planar conductor are at different positions in the normal direction to the surface of the planar conductor,
At least a part of the conductive member is located on the opposite side to the side on which the coil antenna is disposed with respect to the planar conductor in the normal direction.

  With the above configuration, the directivity direction of the antenna can be inclined from the tangential direction of the planar conductor.

(2) It is preferable to further include a circuit board on which a ground conductor is formed, and the planar conductor is the ground conductor. Accordingly, it is not necessary to form a planar conductor dedicated to the antenna device, and an antenna device having a large effective antenna area can be provided while being a small electronic device.

(3) It is preferable that the ground conductor and the conductive member are electrically connected via a connecting portion. Thereby, the said electroconductive member can be made to act as a part of ground conductor, for example, can improve the shielding effect with respect to a circuit board.

(4) The conductive member is, for example, a side surface of the housing that faces the outer edge of the planar conductor. Thereby, the directivity of an antenna can be defined using the metal part of a housing | casing. In addition, there is no need to provide a conductive member dedicated to the antenna device, and an antenna device having a large effective antenna area can be provided while being a small electronic device.

(5) The conductive member may be a radiating element of the UHF band or higher connected to a power feeding circuit that handles a high frequency signal of the UHF band or higher. Accordingly, the conductive member also serves as a radiation element for the UHF band, and an antenna having a frequency band higher than the UHF band can be incorporated into a small electronic device.

(6) It is preferable that the part which the said coil antenna faces among the said housing | casings is comprised with the insulating member. Thereby, the path | route of the magnetic flux which links a coil antenna is ensured.

(7) The electronic device of the present invention
An antenna device housed in a housing or an antenna device including a housing in part,
The antenna device is
A planar conductor composed of a conductor extending in a planar shape;
A notch formed in the planar conductor and connected to an outer edge of the planar conductor;
A coil antenna having a coil opening overlapping the notch in a plan view of the planar conductor;
A conductive member facing the outer edge of the planar conductor to which the notch is connected in plan view;
With
When viewed in the direction along the surface of the planar conductor, the coil antenna and the planar conductor are at different positions in the normal direction to the surface of the planar conductor,
At least a part of the conductive member is located on the side opposite to the side where the coil antenna is disposed with respect to the planar conductor in the normal direction.
It is characterized by that.

  With the above configuration, the directivity direction of the antenna can be tilted from the tangential direction of the planar conductor, and the electronic device can be held over the communication partner (reader of the reader / writer) with a natural posture.

  ADVANTAGE OF THE INVENTION According to this invention, even if there exists restrictions on arrangement | positioning of a planar conductor and a coil antenna, the antenna device which has desired directivity, and an electronic device provided with the same can be comprised.

1A is a plan view of the antenna device 101 according to the first embodiment, and FIG. 1B is a cross-sectional view of an electronic apparatus 201 including the antenna device 101. FIG. 2A is a diagram showing the directivity of the antenna device 101 of the present embodiment, and FIG. 2B is a diagram showing the directivity of a conventional antenna device as a comparative example. FIG. 3 is a diagram illustrating a positional relationship between the reader / writer and the electronic device 201 in a communication state. FIG. 4 is a plan view of an antenna device 102A according to the second embodiment. FIG. 5 is a plan view of an antenna device 102B according to the second embodiment. FIG. 6 is a plan view of an antenna device 102C according to the second embodiment. FIG. 7 is a plan view of an antenna device 103D according to the second embodiment. FIG. 8 is a plan view of an antenna device 103E according to the second embodiment. FIG. 9 is a plan view of an antenna device 103A according to the third embodiment. FIG. 10 is a plan view of the antenna device 103B according to the third embodiment.

  Hereinafter, several specific examples will be given with reference to the drawings to show a plurality of modes for carrying out the present invention. In each figure, the same reference numerals are assigned to the same portions. In consideration of ease of explanation or understanding of the main points, the embodiments are shown separately for convenience, but partial replacement or combination of configurations shown in different embodiments is possible. In the second and subsequent embodiments, description of matters common to the first embodiment is omitted, and only different points will be described. In particular, the same operation effect by the same configuration will not be sequentially described for each embodiment.

  The “antenna device” shown in each embodiment can be applied to either a signal (or power) transmission (power transmission) side or a reception (power reception) side. Even when this “antenna device” is described as an antenna that radiates magnetic flux, the antenna device is not limited to being a magnetic flux generation source. Even when the transmission counterpart antenna device receives (links) the generated magnetic flux, that is, even if the transmission / reception relationship is reversed, the same effect is obtained.

  The “antenna device” shown in the following embodiments is an antenna device used for near-field communication using magnetic field coupling with a communication partner antenna device, or a near field using magnetic coupling with a power transmission counterpart antenna device. It is an antenna apparatus used for the electric power transmission in. In the case of communication, it is applied to a communication system such as NFC (Near field communication). In the case of power transmission, it is applied to a power transmission system such as an electromagnetic induction method or a magnetic field resonance method. That is, the “antenna device” shown in each embodiment is used in a wireless transmission system such as communication or power transmission using at least magnetic coupling. It should be noted that the “antenna device” shown in each embodiment includes a device that wirelessly transmits substantially by electromagnetic field coupling (magnetic field coupling and electric field coupling) with the transmission-side antenna device.

  The “antenna apparatus” shown in each embodiment uses, for example, the HF band, particularly 13.56 MHz, 6.78 MHz, or a frequency band in the vicinity thereof.

  Here, the numerical range of each frequency band can be expressed as follows, for example.

-HF band: 3 MHz or more and 30 MHz or less-UHF band: 300 MHz or more and 3 GHz or less-SHF band: 3 GHz or more and 30 GHz or less Size of antenna device (typically, one end to the other end of a coil conductor of a coil antenna included in the antenna device The length along the coil conductor) is sufficiently smaller than the wavelength λ at the used frequency, and the radiation efficiency of electromagnetic waves is low in the used frequency band. More specifically, the length of the current path of the antenna device is λ / 10 or less. As described above, when the wavelength is sufficiently shorter than the wavelength in the operating frequency band, the current generated in the coil conductor is hardly distributed on the coordinate axis along the coil conductor, and a substantially constant current flows. In addition, the wavelength here is an effective wavelength in consideration of the wavelength shortening effect by the dielectric property and permeability of the base material on which the coil antenna conductor is formed.

  A power feeding circuit for operating a signal (power) in the above-described frequency band is connected to both ends of the coil conductor of the coil antenna. Note that the coil conductor included in the coil antenna and the power supply circuit may be connected by magnetic field coupling via a power supply coil or a transformer (including a balun). In that case, both ends of the coil conductor included in the power supply coil or the transformer are connected to the power supply circuit, and both ends of the coil conductor included in the coil antenna are connected directly or via a capacitor.

<< First Embodiment >>
1A is a plan view of the antenna device 101 according to the first embodiment, and FIG. 1B is a cross-sectional view of an electronic apparatus 201 including the antenna device 101. In FIG. 1 (A), it is shown in a state excluding the casing portion other than the bezel. FIG. 1B is a cross-sectional view of the electronic device taken along line BB in FIG. The electronic device 201 is, for example, a smartphone or a mobile phone terminal.

  As shown in FIG. 1B, the electronic apparatus 201 including the antenna device 101 includes a rear case 61, a display case 62, and a bezel 31. In this example, the casings 61 and 62 are molded bodies of an insulating resin, and the bezel 31 is a molded body of a metal plate. That is, the bezel 31 has conductivity. Therefore, at least a part of the casing that the coil antenna faces is made of an insulating member. Specifically, a portion of the casing that faces at least a part of the coil opening CA of the coil conductor pattern 21 is configured by an insulating member. Thereby, the coil conductor pattern 21 can be made to act as a coil antenna, without shielding at least a part of magnetic flux interlinking the coil conductor pattern 21 by the housing.

  In the space surrounded by the casings 61 and 62 and the bezel 31, the circuit board 10, the coil antenna module 20, and the like are accommodated. The coil antenna module 20 is attached to the inner surface of the housing 61 on the back side. In the present embodiment, the camera module 50 is also attached to the rear case 61.

  The circuit board 10 is formed with a ground conductor pattern 11 extending in a planar shape. The ground conductor pattern 11 corresponds to a “planar conductor” according to the present invention. A cutout 12 connected to the outer edge EE of the ground conductor pattern 11 is formed in the circuit board 10.

  As shown in FIG. 1A, the coil antenna module 20 has a coil conductor pattern 21 formed on a coil antenna substrate 22. The coil conductor pattern 21 corresponds to a “coil antenna” according to the present invention. The coil antenna substrate 22 is a flexible substrate, and the coil conductor pattern 21 is a rectangular spiral conductor pattern formed on the coil antenna substrate 22. The coil opening CA of the coil conductor pattern 21 overlaps the notch 12 in the plan view of the ground conductor pattern 11. In this example, three sides of the rectangular spiral coil conductor pattern are along the edge of the notch 12 of the ground conductor pattern 11.

  The movable probe pins 40 mounted on the circuit board 10 abut both ends of the coil conductor pattern 21. The circuit board 10 is configured with a power feeding circuit to which the coil conductor pattern 21 is connected via the movable probe pin 40.

  The antenna device 101 includes a bezel 31 that is a part of a housing of an electronic device as one of the components. The bezel 31 is provided on one end face of the rectangular parallelepiped electronic device. As shown in FIG. 1A, the bezel 31 is electrically connected to the ground conductor pattern 11 via the connection portion 32. As a result, the bezel 31 is at the ground potential. Thereby, the bezel 31 can be made to act as a part of ground conductor, for example, the shielding effect with respect to a circuit board can be improved. However, from the viewpoint of directivity control of the antenna device 101, the bezel 31 may be separated from the ground conductor pattern 11 (planar conductor) in terms of potential.

  As shown in FIG. 1B, the coil conductor pattern 21 and the ground conductor pattern 11 are different in the normal direction with respect to the surface of the ground conductor pattern 11 when viewed in the direction along the surface of the ground conductor pattern 11. In position.

  Further, at least a part of the bezel 31 (conductive member) is located on the opposite side to the ground conductor pattern 11 in the normal direction to the surface of the ground conductor pattern 11 (planar conductor). That is, the bezel 31 extends to the opposite side to the ground conductor pattern 11 in the normal direction to the surface of the ground conductor pattern 11.

  The antenna device 101 is electromagnetically coupled (electric field coupling and magnetic field coupling), in particular, magnetic field coupling due to the proximity of the coil conductor pattern 21 and the notched edge of the ground conductor pattern 11, and current flows through the ground conductor pattern 11. The ground conductor pattern 11 acts as a magnetic field radiating element. In addition, since the ground conductor pattern 11 has a magnetic flux collecting effect that guides the magnetic flux to the coil opening of the coil conductor pattern 21 along the surface thereof, the ground conductor spreading in a planar shape has a substantial size of the coil opening of the coil conductor pattern 21. To expand. Further, as shown below, the bezel 31 changes the circulation path of the magnetic flux that passes through the coil opening of the coil conductor pattern.

  FIG. 2A is a diagram showing the directivity of the antenna device 101 of the present embodiment, and FIG. 2B is a diagram showing the directivity of a conventional antenna device as a comparative example. The antenna device of the comparative example is obtained by removing the bezel 31 from the antenna device 101 shown in FIGS.

  2A and 2B, a large number of arrows having a sparse / dense distribution indicate the direction and density of magnetic flux interlinking the coil openings of the coil conductor pattern 21. An elliptical closed curve C indicates one magnetic flux loop (closed circuit). As shown in FIG. 2B, when the bezel 31 is not provided, the magnetic flux interlinking the coil conductor pattern 21 is distributed in a substantially symmetrical manner with respect to the coil winding axis AX. On the other hand, as shown in FIG. 2A, when the bezel 31 is present, as shown by the closed curve C, the magnetic flux distribution is such that the magnetic flux loop circulates around the bezel. This is because the magnetic flux is distributed so as to avoid the bezel 31. Along with this, the approximate direction of the magnetic flux in the vicinity of the coil conductor pattern 21 out of the magnetic flux transmitted (interlinked) through the coil opening is inclined by θ with respect to the coil winding axis AX. That is, the directivity of the antenna is inclined by θ as compared with the antenna without the bezel 31.

  In FIG. 1B, a portion surrounded by a broken line in the bezel 31 is a portion located on the opposite side to the ground conductor pattern 11 in the normal direction to the ground conductor pattern 11. The inclination angle θ increases as the height H of this portion increases.

  FIG. 3 is a diagram illustrating a positional relationship between the reader / writer and the electronic device 201 in a communication state. The antenna directivity of the antenna device 101 (only the coil conductor pattern 21 is shown in FIG. 3) included in the electronic device 201 is inclined by θ from the coil winding axis AX of the coil conductor pattern 21, and the antenna device 101. The magnetic flux that passes through the coil conductor pattern 21 passes through the coil opening of the coil antenna of the reader / writer 301 in a state that is perpendicular or nearly perpendicular. That is, when viewed from the antenna device 101, the effective coil opening of the coil antenna of the reader / writer 301 is widened, and the coupling coefficient between the coil antenna of the reader / writer 301 and the antenna device 101 is increased.

  As shown in FIG. 3, the electronic device 201 can communicate with the reader / writer 301 in a state where the electronic device 201 is tilted with respect to the reading surface of the reader / writer 301. This state is a state in which the shoulder from the operator's shoulder to the tip of the electronic device 201 is substantially straight and the wrist does not have to be bent.

  As described above, according to the present embodiment, the operator can perform communication in a state where the electronic device 201 is held over the reading unit of the reader / writer 301 with a natural and natural posture.

  In the present embodiment, an example in which the camera module 50 is provided in a coaxial relationship with the coil antenna module 20 is shown, but the camera module 50 is an element independent of the antenna device 101 and is not essential.

<< Second Embodiment >>
In the second embodiment, several antenna devices in which the shape of the planar conductor and the shape of the bezel are different from those shown in the first embodiment will be described.

  FIG. 4 is a plan view of an antenna device 102A according to the second embodiment. Compared with the antenna device 101 shown in FIG. 1A, the notch 12 of the ground conductor pattern 11 is deep in the notch direction. In this example, the coil antenna module 20 is located inside the outer edge EE of the ground conductor pattern in plan view.

  FIG. 5 is a plan view of an antenna device 102B according to the second embodiment. Compared to the antenna device 102A shown in FIG. 4, the ground conductor pattern 11 is formed with a notch 12 with an opening 12AP and a slit 12SL. Four sides of the rectangular spiral coil conductor pattern are along the edge of the opening 12AP of the ground conductor pattern 11. Therefore, the coil conductor pattern 21 and the ground conductor pattern 11 are more strongly electromagnetically coupled (electric field coupling and magnetic field coupling), in particular, magnetic field coupling.

  FIG. 6 is a plan view of an antenna device 102C according to the second embodiment. In the antenna device 102 </ b> C, a notch 12 is formed in a corner portion of the ground conductor pattern 11. Two sides of the rectangular spiral coil conductor pattern 21 are along the edge of the notch 12 of the ground conductor pattern 11. The both ends of the bezel 31 and the end of the housing 61 are not in contact with each other, and a first slit portion is formed between one end of the bezel 31 and one end of the housing 61, and the other end of the bezel 31. A second slit portion is formed by the portion and the other end portion of the housing 61. Both the first notch and the second notch are formed on the side surface of the housing. In FIG. 6, a cross section of the housing 61 is also illustrated. In this way, the coil conductor pattern may be arranged at the corner of the ground conductor pattern 11.

  In FIG. 6, the side surface (side portion) of the housing 61 may be a conductive member.

  FIG. 7 is a plan view of an antenna device 102D according to the second embodiment. In the antenna device 102D, a notch 12 is formed at the center of one side of the ground conductor pattern 11. The three sides of the rectangular spiral coil conductor pattern 21 are along the edge of the notch 12 of the ground conductor pattern 11. In FIG. 7, the cross section of the housing 61 is also illustrated. Both end portions of the bezel 31 extend to both side portions of the housing 61. There is no contact between both ends of the bezel 31 and the end of the housing 61, and a first slit portion is formed between one end of the bezel 31 and one end of the housing 61. A second slit portion is formed by the end portion and the other end portion of the housing 61. Both the first notch and the second notch are formed on the side surface of the housing. As described above, the bezel 31 may exist on both sides of the casing 61.

  FIG. 8 is a plan view of an antenna device 102E according to the second embodiment. In the antenna device 102E, notches 12A and 12B are formed at two corners of the circuit board 10 on which the ground conductor pattern 11 is formed. The two sides of the rectangular spiral coil conductor pattern 21 are along the edge of the notch 12 </ b> A of the ground conductor pattern 11. For example, a camera is disposed in the notch 12B. Thus, the camera and the circuit board 10 are configured not to interfere with each other in structure. Thus, the circuit board 10 and the ground conductor pattern 11 may have a notch (12B) other than the position where the coil antenna module 20 is provided.

<< Third Embodiment >>
In the third embodiment, an antenna device using a conductive member as an antenna in a frequency band higher than the UHF band will be described.

  FIG. 9 is a plan view of an antenna device 103A according to the third embodiment. The antenna device 103A is incorporated in an electronic device. In FIG. 9, the cross section of the housing | casing 61 of an electronic device is also shown in figure. The casing 61 is a molded body of insulating resin. A first predetermined point of the bezel 31 is connected to the ground conductor pattern 11 via the connection portion 32. Further, the second power feeding circuit 70 is connected to the second predetermined point of the bezel 31 via the connection portion 33. The second power supply circuit 70 is a power supply circuit that handles high-frequency signals in the UHF band or higher, and is, for example, a circuit for cellular communication or a circuit for WLAN communication. The bezel 31 has a rectangular plate shape, and its longitudinal dimension is a length of one wavelength or less at a frequency to be used (UHF band or higher frequency band), and the connecting portion 32 functions as a short stub. With this structure, the bezel 31 and the connection portions 32 and 33 constitute an inverted F antenna or a plate-like inverted F antenna.

  According to the present embodiment, the bezel 31 also serves as a radiating element for the UHF band, and an antenna having a frequency band higher than the UHF band can be incorporated in a small electronic device.

  FIG. 10 is a plan view of an antenna device 103B according to the third embodiment. The antenna device 103B is incorporated in an electronic device. The casing 61 of the electronic device is a molded body of insulating resin. A predetermined point of the bezel 31 is connected to the ground conductor pattern 11 through the connection portion 32. In addition, a second feeding circuit 70 is connected to a predetermined point of another bezel 34 through a connection portion 33. The bezels 31 and 34 are arranged adjacent to each other.

  The second power supply circuit 70 is a power supply circuit that handles high-frequency signals in the UHF band or higher, and is, for example, a circuit for cellular communication or a circuit for WLAN communication. The bezel 34 functions as a feeding element, and the bezel 31 functions as a parasitic element. That is, the bezels 31 and 34 function as radiating elements for cellular communication or WLAN communication, for example.

  In each of the embodiments described above, the antenna device and the electronic device in the communication system mainly using the magnetic field coupling such as NFC have been described. However, the antenna device and the electronic device in the above-described embodiment use the magnetic field coupling. The contactless power transmission system (electromagnetic induction system, magnetic field resonance system, etc.) can be used similarly. For example, the antenna device in the above-described embodiment can be applied as a power receiving antenna device to a power receiving device of a magnetic resonance type non-contact power transmission system used in the HF band, particularly in the vicinity of 6.78 MHz or 6.78 MHz. Even in this case, the antenna device functions as a power receiving antenna device. In the non-contact power transmission system, the “power feeding circuit” shown in the above embodiment corresponds to a power receiving circuit or a power transmitting circuit. In the case of a power receiving circuit, the power receiving antenna device is connected to supply power to a load (for example, a secondary battery). In the case of a power transmission circuit, the power transmission antenna device is connected to supply power to the power transmission antenna device.

  The power receiving circuit includes a rectifier circuit that is connected to the coil antenna and the load, converts electric power from the coil antenna into direct current, and supplies the direct current to the load. Further, it may further include a smoothing circuit, a DC-DC converter circuit, and the like. The power transmission circuit includes an inverter circuit that supplies power to the coil antenna.

  In each of the embodiments described above, a planar sheet conductor (ground conductor pattern 11) is shown. However, the shape of the sheet conductor is not limited to a planar shape, and may be a curved surface or a part thereof. May be curved.

  Moreover, in each embodiment shown above, although the flat bezel 31 was shown, the shape of this electroconductive member is not restricted to flat form, and one part or all part may curve.

  Furthermore, in each of the embodiments described above, the bezel that is a part of the casing is used as the “conductive member” that is a component of the antenna device. However, the “conductive member” is not inside the resin casing of the electronic device. A metal plate may be disposed at a predetermined position. Further, a metal body or a metal film formed on the inner surface of the resin casing may be used as the “conductive member”.

  Finally, the description of the above embodiment is illustrative in all respects and not restrictive. Those skilled in the art can make modifications and changes as appropriate. The scope of the present invention is shown not by the above embodiments but by the claims. Furthermore, the scope of the present invention includes modifications from the embodiments within the scope equivalent to the claims.

AX ... Coil winding axis CA ... Coil opening EE ... Outer edge 10 ... Circuit board 11 ... Ground conductor pattern 12 ... Notch 12AP ... Opening 12SL ... Slit 20 ... Coil antenna module 21 ... Coil conductor pattern 22 ... Coil antenna boards 31, 34 ... bezels 32, 33 ... connecting part 40 ... movable probe pin 50 ... camera module 61, 62 ... casing 70 ... second feeding circuit 101 ... antenna devices 102A, 102B, 102C ... antenna device 103 ... antenna device 201 ... electronic device 301 ... Reader / Writer

Claims (6)

An antenna device that is housed in a housing of an electronic device or includes a housing of the electronic device in part.
A circuit board on which a ground conductor is formed;
It is composed of a conductor that extends in a planar shape, and the planar conductor that is the ground conductor;
A notch formed in the planar conductor and connected to an outer edge of the planar conductor;
A coil antenna having a coil opening overlapping the notch in a plan view of the planar conductor;
A conductive member facing the outer edge of the planar conductor to which the notch is connected in plan view;
With
When viewed in the direction along the surface of the planar conductor, the coil antenna and the planar conductor are at different positions in the normal direction to the surface of the planar conductor,
At least a part of the conductive member is located on the opposite side to the side where the coil antenna is disposed with respect to the planar conductor in the normal direction.
The ground conductor and the conductive member are electrically connected via a connection portion,
Antenna device. An antenna device that is housed in a housing of an electronic device or includes a housing of the electronic device in part.
A planar conductor composed of a conductor extending in a planar shape;
A notch formed in the planar conductor and connected to an outer edge of the planar conductor;
A coil antenna having a coil opening overlapping the notch in a plan view of the planar conductor;
A conductive member facing the outer edge of the planar conductor to which the notch is connected in plan view;
With
When viewed in the direction along the surface of the planar conductor, the coil antenna and the planar conductor are at different positions in the normal direction to the surface of the planar conductor,
At least a part of the conductive member is located on the opposite side to the side where the coil antenna is disposed with respect to the planar conductor in the normal direction.
The conductive member is a radiating element of the UHF band or higher connected to a power supply circuit that handles a high frequency signal of the UHF band or higher,
Antenna device.   The antenna device according to claim 1, wherein the conductive member is a side surface of the housing that faces an outer edge of the planar conductor.   The antenna device according to any one of claims 1 to 3, wherein a portion of the casing that the coil antenna faces is made of an insulating member. An electronic device including an antenna device housed in a housing or an antenna device including a housing in part,
The antenna device is
A circuit board on which a ground conductor is formed;
It is composed of a conductor that extends in a planar shape, and the planar conductor that is the ground conductor;
A notch formed in the planar conductor and connected to an outer edge of the planar conductor;
A coil antenna having a coil opening overlapping the notch in a plan view of the planar conductor;
A conductive member facing the outer edge of the planar conductor to which the notch is connected in plan view;
With
When viewed in the direction along the surface of the planar conductor, the coil antenna and the planar conductor are at different positions in the normal direction to the surface of the planar conductor,
At least a part of the conductive member is located on the opposite side to the side where the coil antenna is disposed with respect to the planar conductor in the normal direction.
The ground conductor and the conductive member are electrically connected via a connection portion,
An electronic device characterized by that. An electronic device including an antenna device housed in a housing or an antenna device including a housing in part,
The antenna device is
A planar conductor composed of a conductor extending in a planar shape;
A notch formed in the planar conductor and connected to an outer edge of the planar conductor;
A coil antenna having a coil opening overlapping the notch in a plan view of the planar conductor;
A conductive member facing the outer edge of the planar conductor to which the notch is connected in plan view;
With
When viewed in the direction along the surface of the planar conductor, the coil antenna and the planar conductor are at different positions in the normal direction to the surface of the planar conductor,
At least a part of the conductive member is located on the opposite side to the side where the coil antenna is disposed with respect to the planar conductor in the normal direction.
The conductive member is a radiating element of the UHF band or higher connected to a power supply circuit that handles a high frequency signal of the UHF band or higher,
An electronic device characterized by that.