WO2014148313A1 - Antenna apparatus and electronic device - Google Patents

Abstract

Provided is an antenna apparatus wherein a plurality of antennas are efficiently arranged in a space-saving manner and antenna performance is improved. Said antenna apparatus (10) is provided with a loop-antenna part (3) and an antenna part (13) laid out within said loop-antenna part (3). The loop-antenna part (3) and the antenna part (13) have magnetic-grain-containing magnetic resin layers (4a, 4b). At least part of the loop-antenna part (3) and/or at least part of the antenna part (13) is embedded within said magnetic resin layers (4a, 4b).

Description

ANTENNA DEVICE AND ELECTRONIC DEVICE

The present invention relates to an antenna device having a plurality of antennas, and more particularly to an antenna device in which a plurality of antennas are stacked and an electronic apparatus using the antenna device. This application claims priority on the basis of Japanese Patent Application No. 2013-056779 filed on March 19, 2013 in Japan, and is incorporated herein by reference. Is done.

Recent wireless communication devices are equipped with a plurality of RF antennas such as a telephone communication antenna, a GPS antenna, a wireless LAN / BLUETOOTH (registered trademark) antenna, and an RFID (Radio Frequency Identification). In addition to these, with the introduction of non-contact charging, antenna coils for power transmission have also been mounted. Examples of the power transmission method used in the non-contact charging method include an electromagnetic induction method, a radio wave reception method, and a magnetic resonance method. All of these transmit power by electromagnetic induction or magnetic resonance between the primary side coil and the secondary side coil.

Even if these antennas are designed so that the maximum characteristics can be obtained at the target frequency with the antenna itself, it is difficult to obtain the target characteristics when actually mounted on an electronic device. This is because the magnetic field component around the antenna interferes (couples) with the surrounding metal and the like, and the inductance of the antenna coil is substantially reduced, so that the resonance frequency is shifted. In addition, the reception sensitivity is lowered due to a substantial decrease in inductance. As countermeasures for this, by inserting a magnetic shield material between the antenna coil and the metal existing around it, the magnetic flux generated from the antenna coil is collected in the magnetic shield material, thereby reducing the interference caused by the metal and increasing the inductance. Therefore, the reception sensitivity is improved.

With the trend toward downsizing and higher functionality of electronic devices, the space allocated for mounting a plurality of antennas as described above on electronic devices such as portable terminal devices is extremely small. As shown in FIGS. 16A and 16B, a general antenna has a configuration in which a magnetic flux concentrating magnetic shielding sheet 42 is attached to a spiral coil-shaped loop antenna element 2 with an adhesive layer 41 coated with an adhesive. Yes. However, in such a loop antenna, each antenna occupies a mounting space in an electronic device in which the antenna is mounted, so that the mounting area increases with an increase in the type and quantity of antennas to be mounted. For this reason, there is an increasing demand for downsizing and thinning of these antennas, as well as integration and integration.

Incidentally, since magnetic shielding materials used for non-contact communication and non-contact charging generally have good shielding performance when the magnetic permeability is high, high-permeability ferrites and metal magnetic foils have been mainly used. However, when these magnetic shield materials are used in an environment where a strong DC magnetic field is applied, the magnetic material undergoes magnetic saturation and the effective magnetic permeability decreases. For example, Non-Patent Document 1 reports that the ferrite core has a significant decrease in DC superposition characteristics due to magnetic saturation. In addition, since a metal magnetic foil having a high saturation magnetic flux density is generally as thin as several tens of microns, the problem of magnetic saturation occurs similarly if it is not used by overlapping several tens of sheets.

Regarding electromagnetic induction type non-contact charging, a wireless power consortium (Wireless Power Consortium, WPC) defines a magnet-mounted transmission coil unit (design A1 described in Non-Patent Document 2) and is already on the market. In order to produce a thin coil unit, it is necessary to reduce the thickness of the magnetic shield, so that the above-described magnetic saturation becomes significant and the inductance of the coil is greatly reduced. For this reason, the resonance frequency on the power receiving coil side is greatly deviated, resulting in a problem that the transmission efficiency of the transmission power from the primary side to the secondary side is lowered and the heat generation of the power receiving coil is increased. Furthermore, there is a problem that transmission itself cannot be performed if the resonance frequency shift is significant.

Therefore, an object of the present invention is to provide an antenna device having improved antenna performance while efficiently arranging a plurality of antennas in a space-saving manner.

As a means for solving the above-described problems, an antenna device according to an embodiment of the present invention includes a loop antenna and one or more other antennas arranged on the inner diameter of the loop antenna. The loop antenna and other antennas have one or more magnetic resin layers containing magnetic particles. At least one of the loop antenna or one or more other antennas is at least partially embedded in the magnetic resin layer.

As a means for solving the above-described problems, an electronic apparatus according to the present invention includes an antenna device having a loop antenna and one or more other antennas arranged on the inner diameter of the loop antenna. The loop antenna and other antennas have one or more magnetic resin layers containing magnetic particles. At least one of the loop antenna or one or more other antennas is at least partially embedded in the magnetic resin layer.

Preferably, in the antenna device and the electronic apparatus using the antenna device, at least one of the one or more magnetic resin layers has a spherical shape or a dimensional ratio represented by a ratio of a major axis to a minor axis. 6 or less spheroidal magnetic particles are included.

In the antenna device and the electronic apparatus according to the present invention, one or more other antennas are arranged on the inner diameter of the loop antenna, so that the mounting area of the antenna device becomes the occupied area of the loop antenna, and the mounting space can be reduced. .

In addition, because all or part of the magnetic shield layer has a magnetic resin layer with little deterioration of magnetic properties due to magnetic saturation, there is little change in coil inductance and stable communication even in environments where a strong magnetic field is applied. Can do.

FIG. 1A is a plan view showing a configuration example of an antenna device according to an embodiment of the present invention. 1B is a cross-sectional view taken along the line AA ′ of FIG. 1A. FIG. 2A is a plan view showing a modification of the antenna device according to one embodiment of the present invention. 2B is a cross-sectional view taken along the line AA ′ of FIG. 2A. FIG. 3A is a plan view showing a modification of the antenna device according to one embodiment of the present invention. 3B is a cross-sectional view taken along the line AA ′ of FIG. 3A. FIG. 4A is a plan view showing a modification of the antenna device according to one embodiment of the present invention. 4B is a cross-sectional view taken along the line AA ′ of FIG. 4A. FIG. 5A is a plan view showing a modification of the antenna device according to one embodiment of the present invention. FIG. 5B is a cross-sectional view taken along line AA ′ in FIG. 5A. FIG. 6A is a plan view showing a modification of the antenna device according to one embodiment of the present invention. 6B is a cross-sectional view taken along the line AA ′ of FIG. 6A. FIG. 7A is a plan view showing a modification of the antenna device according to one embodiment of the present invention. FIG. 7B is a cross-sectional view taken along line AA ′ in FIG. 7A. FIG. 8 is a block diagram illustrating a configuration example of a contactless communication system using an antenna device. FIG. 9 is a block diagram showing the main part of the resonance circuit. FIG. 10 is a block diagram illustrating a configuration example of a non-contact charging system using an antenna device. FIG. 11 is a diagram illustrating the configuration of a measurement antenna device for measuring the influence of the magnetic resin layer and the magnetic layer on the magnetic characteristics. 11A is a plan view, FIG. 11B is a cross-sectional view taken along the line AA ′ of FIG. 11A, and is a cross-sectional view when the magnetic shield layer is only a magnetic resin layer. FIG. 11C is a cross-sectional view taken along the line AA of FIG. It is sectional drawing in a line, Comprising: It is sectional drawing in case a magnetic shield layer consists of a magnetic resin layer and a magnetic layer. FIG. 12 is a side view showing a configuration of a coil module for characteristic evaluation of the present invention. 12A is a side view showing a configuration of a single coil module, and FIG. 12B is a side view of the coil module shown together with a transmission coil unit including a magnet that generates a DC magnetic field. FIG. 13 is a graph plotted by changing the thickness of the magnetic shield layer with the inductance change value when the DC magnetic field is applied relative to the inductance value of the coil when no DC magnetic field is applied as the relative value ΔL of the inductance. . 13A shows ΔL when the spherical magnetic alloy is used for the magnetic resin layer and the relative permeability is about 20, and FIG. 13B shows ΔL when the spherical magnetic field is used for the magnetic resin layer and the relative permeability is about 15. . FIG. 14 is a graph of a comparative example in which the relative value ΔL of inductance is plotted by changing the thickness of the magnetic shield layer. FIG. 14A shows a case where a relative magnetic permeability is about 100 using a magnetic shield layer using sendust having a major axis / minor axis of about 50. FIG. 14B shows a relative permeability of 1500 using MnZn ferrite as the magnetic shield layer. ΔL in the case of the degree is shown. FIG. 15 is a graph obtained by measuring a difference in inductance value when a magnetic layer is added to the magnetic resin layer. FIG. 15A is a diagram in which measured values of inductance in the absence of a DC magnetic field and FIG. 15B in the presence of a DC magnetic field are plotted against the thickness of the magnetic shield layer. FIG. 16A is a plan view of a conventional single antenna device. 16B is a cross-sectional view taken along the line AA ′ of FIG. 16A.

Hereinafter, embodiments for carrying out the present invention will be described in detail with reference to the drawings. It should be noted that the present invention is not limited to the following embodiments, and various modifications can be made without departing from the scope of the present invention.

[Configuration of antenna device]
First, an antenna apparatus 10 to which a communication antenna is applied as the loop antenna element 2 and a non-contact power feeding antenna is applied as the other antenna element 12 will be described.

As shown in FIGS. 1A and 1B, an antenna device 10 according to an embodiment of the present invention has a spiral coil shape formed by spirally winding a conductive wire 1 on one surface of a flat support base 8. A loop antenna part 3 having the loop antenna element 2 and an antenna part 13 in which the entire antenna element 12 around which the conducting wire 11 is wound are embedded in the magnetic resin layer 4a are provided. The magnetic resin layer 4a of the antenna part 13 is extended on the outer peripheral part of the antenna part 13, and the magnetic sheet 4d is placed on the upper surface of the extended part of the antenna part 13 at a position overlapping the loop antenna element 2. The entire layer 4a is embedded, and the upper surface is disposed so as to be exposed from the magnetic resin layer 4a. The loop antenna unit 3 is disposed on the upper surface of the antenna unit 13. Another magnetic resin layer 4b is disposed on the lower surface of the magnetic resin layer 4a, that is, the surface opposite to the side where the antenna element 12 is embedded. When the antenna unit 13 is arranged on the inner diameter of the loop antenna unit 3, it is preferable to arrange the antenna units so that the central axes of the respective antennas substantially coincide.

The antenna element 12 and the loop antenna element 2 can be electrically connected to an external circuit through lead wires from the conductive wires 1 and 11 embedded in the magnetic resin layers 4a and 4b. Since the magnetic resin layers 4a and 4b can be easily deformed in an uncured state, the lead wires are embedded in the magnetic resin layers 4a and 4b in a pressing process at the time of manufacturing described later.

The antenna element 12 is not limited to the loop antenna as shown in FIGS. 1A and 1B, and may be another antenna element such as a cellular phone communication such as a planar antenna or a dielectric antenna.

As the magnetic particles used for the magnetic resin layer 4a, spherical, flat, or pulverized powders having a particle size of several μm to several tens of μm can be used. You may mix and use powder. Among the magnetic particles described above, particularly when metal magnetic particles are used, the complex permeability has frequency characteristics, and loss occurs due to the skin effect when the operating frequency is high. Adjust particle size and shape.

The magnetic particles used in the magnetic resin layer 4b are spherical, slender (cigar type), or flat (disc type) spheroids with a particle size of several to 100 μm, and their dimensional ratio (major axis / minor axis). Is 6 or less. Also in this case, not only a single magnetic powder but also powders having different powder diameters, materials, and dimensional ratios may be mixed and used.

Since the magnetic resin layer 4a is a layer in which the conductive wire 11 is embedded, the filling rate of the magnetic powder is reduced to ensure fluidity and deformability in an uncured state, whereas the magnetic resin layer 4b The filling rate of the magnetic powder is set to be larger than that of the magnetic resin layer 4a so that the magnetic shield characteristics are improved. In particular, for the purpose of improving the magnetic properties by increasing the filling property, a powder magnetic core obtained by mixing and molding metal magnetic powder, resin, lubricant, and the like can also be used as the magnetic resin layer 4b. Further, the particle shape of the magnetic resin layer 4b is a spheroid having a small dimensional ratio from a spherical shape, and has a large demagnetizing field coefficient and is not easily saturated with an external magnetic field. Since the particles having a large demagnetizing field coefficient form the magnetic resin layer 4b through the resin, the magnetic characteristics exhibit little influence of magnetic saturation even in a large DC magnetic field environment.

The magnetic resin layers 4a and 4b contain magnetic particles made of soft magnetic powder and a resin as a binder. The magnetic particles are oxide magnetic materials such as ferrite, Fe-based, Co-based, Ni-based, Fe-Ni-based, Fe-Co-based, Fe-Al-based, Fe-Si-based, Fe-Si-Al-based, Fe- Ni-Si-Al-based crystal system, microcrystalline metal magnetic material, or Fe-Si-B system, Fe-Si-BC system, Co-Si-B system, Co-Zr system, Co-Nb Or amorphous metal magnetic particles such as Co—Ta. Further, the inductance value of the antenna device 10 is determined by the real part magnetic permeability (hereinafter simply referred to as magnetic permeability) of the magnetic material, but the magnetic permeability can be adjusted by the mixing ratio of the magnetic particles and the resin. . Since the relationship between the average magnetic permeability of the magnetic resin layers 4a and 4b and the magnetic permeability of the magnetic particles to be blended generally follows the logarithmic mixing rule with respect to the blending amount, the volume filling rate at which the interaction between the particles increases. It is preferable to set it to 40 vol% or more. The heat conduction characteristics of the magnetic resin layers 4a and 4b are also improved as the filling rate of the magnetic particles is increased.

The magnetic resin layers 4a and 4b are not limited to being composed of a single magnetic material. Two or more kinds of magnetic materials may be mixed and used, and a magnetic resin layer may be formed by laminating in multiple layers. Moreover, even if it is the same magnetic material, the particle size and / or shape of magnetic particles may be selected and mixed, or may be laminated in multiple layers. Further, the magnetic material or composition may be changed for each antenna. In addition to the magnetic particles, the magnetic resin layers 4a and 4b can contain a filler for improving thermal conductivity, particle filling property, and the like.

The magnetic sheet 4d is used for magnetic shielding of the loop antenna element 2, and is made of an oxide magnetic material such as ferrite, Fe-based, Co-based, Ni-based, Fe-Ni-based, Fe-Co-based, Fe-Al-based. Fe-Si-based, Fe-Si-Al-based, Fe-Ni-Si-Al-based crystalline or microcrystalline metal magnetic materials, or Fe-Si-B-based, Fe-Si-BC-based, Amorphous metal magnetic materials such as Co—Si—B, Co—Zr, Co—Nb, and Co—Ta can be used. In addition, a sheet prepared by compression molding or baking these magnetic particles with a binder may be used. The magnetic sheet 4d may be omitted when the performance of the antenna is sufficient or when it is affected by a DC magnetic field described later.

As the binder, a resin that is cured by heat, ultraviolet irradiation, or the like is used. As the binder, for example, a known material such as a resin such as an epoxy resin, a phenol resin, a melamine resin, a urea resin, or an unsaturated polyester, or a rubber such as silicone rubber, urethane rubber, acrylic rubber, butyl rubber, or ethylene propylene rubber is used. However, the present invention is not limited to these, and other known materials can be used. An appropriate amount of a surface treatment agent such as a flame retardant, a reaction modifier, a crosslinking agent, or a silane coupling agent may be added to the above-described resin or rubber.

The conducting wire 11 forming the antenna element 12 is used when the antenna unit 13 is used as a secondary charging coil for non-contact power feeding having a charging output capacity of about 5 W, and when used at a frequency of about 120 kHz, 0 is used. It is preferable to use a single wire made of Cu or an alloy containing Cu as a main component with a diameter of 20 mm to 0.45 mm. Alternatively, in order to reduce the skin effect of the conductive wire 11, a parallel line formed by bundling a plurality of fine wires thinner than the above-mentioned single wire, a knitted wire may be used, and one layer using a thin rectangular wire or a flat wire, Or it is good also as alpha winding of 2 layers. The loop antenna unit 3 can also be arbitrarily determined in consideration of the frequency and current capacity used.

As the loop antenna element 2 and the antenna element 12, a substrate in which a coil is formed by patterning a conductor on one side or both sides of a sub-substrate such as a phenol substrate or a flexible substrate such as polyimide can be used. In such a configuration using a coil produced by patterning a conductor on one or both sides of the base material, the thickness of the antenna element can be reduced, so that the thickness of the antenna device 10 can be further reduced. Since a relatively large current flows in a contactless power supply application, the antenna element 12 is constituted by a coil using, for example, a single wire or a double wire, and the loop antenna element 2 for communication is patterned on one or both surfaces of a base material. For example, the coil may be formed of a so-called FPC (Flexible Printed Circuit) coil. The number of turns can be increased by patterning the conductive wires 1 on both sides of the substrate and connecting the respective patterns in series via through holes. Further, the current capacity can be increased by connecting the conductive wires 1 patterned on both surfaces of the substrate in parallel through the through holes. By using a multilayer substrate as a substrate, it is possible to further increase the number of layers, and the multilayer wiring can further increase the number of turns and the current capacity.

Since the antenna device 10 of the present invention configured as described above is formed by stacking a plurality of antennas in the thickness direction, space saving can be realized.

Furthermore, in the antenna device 10 of the present invention, since the antenna element 12 is embedded in the magnetic resin layer 4a, the magnetic flux density near the coil can be increased, and a desired inductance value can be obtained even with a small number of turns. be able to. As a result, the number of turns can be reduced in order to obtain a desired inductance value, so that the direct current resistance of the conducting wire 11 can be reduced and a reduction in loss can be achieved. In addition, the heat conduction characteristics of the magnetic resin layer 4a can radiate heat more efficiently, and it is also possible to reduce the heat radiation space in the electronic device due to a decrease in heat generation. In addition, the magnetic resin layer 4b serving as the magnetic shield layer of the antenna unit 13 can be widened, and the magnetic resin layer 4b is configured to be hard to be magnetically saturated, so there is no strong magnetic field in the vicinity. Regardless, good magnetic shielding performance can be exhibited.

[Manufacturing method of antenna device]
Next, an example of a method for manufacturing the antenna device 10 will be described.

First, sheets used for the magnetic resin layers 4a and 4b are prepared. In the case of the magnetic resin layer 4a, spherical metal magnetic particles having an average particle diameter of 5 μm are added to an acrylic resin together with a diluent and kneaded. This is processed using a sheet molding machine and dried to form a sheet having a predetermined thickness. In the magnetic resin layer 4b, a sheet is formed in the same manner as the magnetic resin layer 4a. In order to enhance the magnetic shielding performance, the magnetic particles are filled more than in the case of the magnetic resin layer 4a. For this reason, two types of spherical amorphous metal magnetic particles having an average particle size of 25 μm and 5 μm are used, and the filling rate is increased by inserting particles having a small particle size between particles having a large particle size. Each sheet formed in this manner is processed into a predetermined shape to form magnetic resin layers 4a and 4b.

Thereafter, the magnetic resin layer 4b is disposed in a mold and heated and pressed to obtain a hardened magnetic resin layer 4b having a predetermined shape. As the magnetic resin layer 4b, a powder-molded material may be used. When the magnetic resin layer 4b is produced by the above-described method, if the compressive strength is high even before the curing process, the heating press is omitted, and the magnetic resin layer that follows. You may make it harden | cure together with the hardening process of 4a.

Next, the loop antenna part 3 in which the loop antenna element 2 and the magnetic sheet 4d are bonded to the support base 8 and the antenna element 12 are placed so as to be embedded in the magnetic resin layer 4a having a predetermined thickness. At this time, the lead wire of the lead wire 11 and the lead wire of the lead wire 1 penetrating the support base material 8 are on the magnetic resin layer 4b side, and the end portion is provided on a part of the outer frame of the mold. Install so that it goes out along the groove. Thereafter, the antenna device 10 is completed by heating and pressing to cure the magnetic resin layer 4a and removing it from the mold. In the antenna device 10 manufactured as described above, the lead wires of the conducting wires 1 and 11 are embedded in the magnetic resin layers 4a and 4b, and coil end portions for connection to an external circuit are drawn out.

The amount of the magnetic resin layer 4a may be an amount for completely embedding the loop antenna element 2 and the antenna element 12, or an amount for exposing a part of the loop antenna element 2 and the antenna element 12. Further, the position of the magnetic resin layer 4a may be a position embedded so as to fill all or part of the outer diameter portion or the inner diameter portion of the loop antenna element 2 and / or the antenna element 12.

When the loop antenna element 2 and the antenna element 12 and the magnetic resin layers 4a and 4b are fixed by the manufacturing method as described above, it is not necessary to use an adhesive. Accordingly, the number of steps for applying the adhesive is reduced, and the antenna device 10 can be made thinner by the amount of the adhesive layer formed by applying the adhesive. In addition, since the magnetic resin layers 4a and 4b are kneaded with the resin as described above, they do not cause breakage such as cracking against an external impact, so it is necessary to stick a protective sheet on the surface. There is no. Therefore, the protective sheet sticking process can be reduced, and an increase in the thickness of the antenna device over the protective sheet can be suppressed.

In addition, the magnetic resin layers 4a and 4b are formed by kneading magnetic particles and a resin and have an appropriate flexibility even after curing. Therefore, the magnetic resin layers 4a and 4b are processed in accordance with the shape inside the casing of the electronic device. Can be installed.

[Modification 1]
2A and 2B are examples in which the cross-sectional structure of the magnetic resin layer 4b is convex. By disposing a magnetic material having higher permeability on the inner diameter side of the antenna element 12, the inductance of the antenna and the coupling coefficient between the transmitting and receiving antennas can be increased, and the communication characteristics can be improved.

The antenna device 10a includes a loop antenna unit 3 having a spiral coil-shaped loop antenna element 2 formed by winding a conducting wire 1 around a support base 8, and an antenna having a conducting wire 11 wound in a spiral shape. The entire element 12 includes an antenna portion 13 embedded in the magnetic resin layer 4a. The magnetic resin layer 4a of the antenna part 13 is extended on the outer peripheral part of the antenna part 13, and the magnetic sheet 4d is placed on the upper surface of the extended part of the antenna part 13 at a position overlapping the loop antenna element 2. The entire layer 4a is embedded, and the upper surface is disposed so as to be exposed from the magnetic resin layer 4a. The loop antenna unit 3 is disposed on the upper surface of the antenna unit 13. Another magnetic resin layer 4b is disposed on the lower surface of the magnetic resin layer 4a, that is, the surface opposite to the side where the antenna element 12 is embedded. The magnetic resin layer 4b is disposed on the inner diameter side of the loop antenna element 2 and on the lower surface of the magnetic resin layer 4a so as to fill the vicinity of the center of the inner diameter of the loop antenna element 2 until the surface is exposed. .

The shape of the magnetic resin layer 4b is not limited to a flat plate shape as shown in FIGS. 1A and 1B or a convex shape as shown in FIGS. 2A and 2B. The size and shape of the magnetic resin layer 4b can be arbitrarily set according to the required specifications such as the size and communication characteristics of the antenna device. Further, since the magnetic resin layer 4a flows by pressing, the shape, thickness and the like can be controlled, and the position where the magnetic resin layer 4a is filled is, for example, only near the inner diameter side of the antenna element 12, Arbitrary control such as extending between the antenna element 2 and the antenna element 12 is possible.

[Modification 2]
3A and 3B, in order to improve the performance of the loop antenna element 2, a part of the conductor wire 1 constituting the loop antenna element 2 is arranged at a position where the inner diameter side conductor 1 is superimposed on the antenna unit 13. An example is shown. In this case, since the conducting wire 1 superimposed on the antenna unit 13 side affects the performance of the loop antenna element 2, it is necessary to pay attention to the shape and size of the conducting wire 1.

3A and 3B, the magnetic layer 4c is disposed on the lower surface of the magnetic resin layer 4b in order to further improve the magnetic shield characteristics. Since the magnetic resin layer 4b is obtained by blending magnetic particles in a resin, the magnetic permeability is lower than that of a bulk material having a high magnetic permeability configuration. For this reason, the magnetic shielding effect can be enhanced by adding the magnetic layer 4c having a high magnetic permeability to the magnetic resin layer 4b. Here, although the magnetic layer 4c is made of a magnetic material having a high magnetic permeability and will be described later, it is generally a material that is easily magnetically saturated. Therefore, when used in an environment where a DC magnetic field exists, the magnetic resin layer 4b is mainly used, and the magnetic layer 4c is supplementarily added. The magnetic layer 4c is disposed on the lower surface side of the magnetic resin layer 4b in FIGS. 3A and 3B, but may be used so as to be embedded in the upper surface of the magnetic resin layer 4b or inside the magnetic resin layer 4b. Moreover, it can be used as an arbitrary shape such as a smaller shape or a larger shape than the magnetic resin layer 4b. The magnetic layer 4c is a material having a high magnetic permeability, and is a magnetic oxide such as ferrite, Fe-based, Co-based, Ni-based, Fe-Ni-based, Fe-Co-based, Fe-Al-based, Fe-Si-based. , Fe-Si-Al-based, Fe-Ni-Si-Al-based crystalline, microcrystalline metallic magnetic materials, or Fe-Si-B, Fe-Si-BC, Co-Si-B Amorphous metal magnetic materials such as Co, Zr, Co—Nb, and Co—Ta can be used. In addition, a magnetic powder obtained by adding a binder to these magnetic particles, a sheet formed by compression molding or baking, and a magnetic powder obtained by flattening these magnetic materials with a resin, etc. A sheet prepared by kneading can also be used.

In the antenna device 10b shown in FIGS. 3A and 3B, a lead-out portion 6 is further provided in the magnetic resin layer 4b and the magnetic layer 4c for storing lead-out wires of the conducting wires 1 and 11. When the lead wires of the conductive wires 1 and 11 cannot be embedded in the magnetic resin layer 4b or the magnetic layer 4c or both by hot pressing at the time of production, the lead portions 6 are provided in the magnetic resin layer 4b or the magnetic layer 4c or both. Thus, the antenna device 10 can be reduced in height by storing the lead wires of the conducting wires 1 and 11.

[Modification 3]
4A and 4B show an example in which another antenna element 22 is provided on the inner diameter side of the loop antenna element 2. The antenna device 10 c has a loop antenna element 2 composed of a spiral conductive wire 1 and an antenna element 22 composed of a spiral conductive wire 21 on the inner diameter of the loop antenna element 2 on the same support base 8. The magnetic resin layer 4a of the antenna part 13 is extended on the outer peripheral part of the antenna part 13, and the magnetic sheet 4d is placed on the upper surface of the extended part of the antenna part 13 at a position overlapping the loop antenna element 2. The entire layer 4a is embedded, and the upper surface is disposed so as to be exposed from the magnetic resin layer 4a. The loop antenna unit 3 and the antenna unit 23 are disposed on the upper surface of the antenna unit 13. Another magnetic resin layer 4b is disposed on the lower surface of the magnetic resin layer 4a, that is, the surface opposite to the side where the antenna element 12 is embedded.

The loop antenna element 2 constitutes the loop antenna portion 3 together with the magnetic sheet 4d and the magnetic resin layers 4a and 4b, and the antenna element 22 arranged on the inner diameter of the loop antenna element 2 includes the antenna portion 23 together with the magnetic resin layers 4a and 4b. Configure. The antenna element 12 constitutes an antenna portion 13 together with the magnetic resin layers 4a and 4b.

In such a configuration, for example, the antenna unit 13 can be used for non-contact power feeding, the loop antenna unit 3 can be used for an NFC antenna, and the antenna unit 23 can be used as a foreign object detection coil. Without being limited to this, for example, the loop antenna unit 3 can be used for non-contact power feeding, or the antenna unit 23 can be used for another communication antenna.

4A and 4B, the loop antenna element 2 and the antenna element 12 are configured with respect to the same support base material 8, but the antenna element 12 and another antenna element 22 are formed using different support base materials, It is good also as a structure arrange | positioned in a board | substrate planar direction, or laminating | stacking on the thickness direction. In FIG. 4A and FIG. 4B, the magnetic sheet 4d used for the loop antenna element 2 is omitted below the other antenna element 22, but a magnetic layer is provided to improve the characteristics as with the loop antenna element 2. You may do it. In this case, it is necessary to pay attention to the characteristics, size, and arrangement location when using the shape and pattern of the conductor 21 of the antenna element 22 and the magnetic layer so as not to greatly affect the characteristics of the antenna element 12. .

Note that the loop antenna elements 2 and 22 can be constituted by a so-called FPC (Flexible Printed Circuit) coil produced by patterning a metal conductor on one or both surfaces of the same base material. Needless to say, the loop antenna elements 2 and 22 may be FPC coils formed on different substrates.

[Modification 4]
In FIG. 5A and FIG. 5B, the magnetic resin layer 4 b is disposed so as to overlap only the antenna portion 13, and a spacer 7 for supporting the loop antenna element 2 is disposed below the loop antenna element 2. An example is shown.

That is, the antenna device 10d includes a loop antenna portion 3 having a spiral coil-shaped loop antenna element 2 formed by winding a conducting wire 1 around a support base 8, and a conducting wire 11 wound in a spiral shape. The entire antenna element 12 includes an antenna portion 13 embedded in the magnetic resin layer 4a. The magnetic resin layer 4a of the antenna part 13 is extended on the outer peripheral part of the antenna part 13, and the magnetic sheet 4d is placed on the upper surface of the extended part of the antenna part 13 at a position overlapping the loop antenna element 2. The entire layer 4a is embedded, and the upper surface is disposed so as to be exposed from the magnetic resin layer 4a. The loop antenna unit 3 is disposed on the upper surface of the antenna unit 13. Another magnetic resin layer 4b is disposed on the lower surface of the magnetic resin layer 4a, that is, the surface opposite to the side where the antenna element 12 is embedded.

When a nonmagnetic material is used as the spacer 7, magnetic interference between the loop antenna unit 3 and the antenna unit 13 can be reduced. Further, when a material having excellent thermal conductivity is used for the spacer 7, heat generated in the antenna unit 13 used for non-contact charging can be effectively radiated. In the example shown in FIGS. 5A and 5B, the magnetic sheet 4d on which the loop antenna element 2 is placed can be fixed without using an adhesive by the magnetic resin layer 4a, but the loop antenna element 2 is bonded in advance. The loop antenna portion 3 may be configured by joining with an agent or the like, and then fixed by one or both of the antenna portion 13 and the magnetic resin layers 4a and 4b. The spacer 7 and the magnetic resin layer 4b can be used in a state where they are fixed in advance.

[Modification 5]
6A and 6B, in the antenna device 10e, the thickness of the spacer 7 is adjusted, the thickness of the portion where the loop antenna element 2 outside the antenna device 10 is formed, and the center of the antenna device 10 You may make it the thickness of the part in which the nearby antenna element 12 was comprised become substantially the same. The overall thickness of the antenna device 10e can be made thinner than in the case of FIGS. 1A and 1B to 5A and 5B.

[Modification 6]
As shown in FIGS. 7A and 7B, the loop antenna portion 3 and the antenna portion 13 are separately manufactured, and the magnetic resin layer 4a and the supporting base material are used regardless of the spacers as shown in FIGS. 5A, 5B, 6A, and 6B. The two may be connected together by fixing them together.

In this way, in the antenna device of the present invention, since another antenna is placed on one antenna, a space-saving antenna device can be realized.

Furthermore, since the antenna device of the present invention uses a magnetic resin layer that is hard to be magnetically saturated as the main magnetic shield, it can perform stable communication with little change in the inductance value of the coil even in an environment where a DC magnetic field is applied. Furthermore, in the antenna device of the present invention, since the periphery of the coil is covered with a magnetic resin layer having magnetism and thermal conductivity, it is possible to increase the inductance of the coil and to release the heat generated in the coil. Heat generation is a problem especially when sending and receiving large electric power, but since heat can be released efficiently, it is possible to reduce the heat dissipation space in the electronic equipment due to the decrease in heat generation, which effectively reduces the size of the equipment.・ Contributes to thinning.

Furthermore, since the magnetic resin layers 4a and 4b are formed by kneading the resin with the magnetic particles, the magnetic resin layers 4a and 4b have flexibility even after curing, and are mounted and mounted according to the internal shape of the electronic device. Is possible.

[Specific examples of configuring a non-contact communication system and a non-contact charging system]
<Configuration example of non-contact communication device>
An antenna device 10 according to an embodiment of the present invention forms a resonance circuit as a resonance coil (antenna) together with a resonance capacitor. And the comprised resonant circuit is mounted in a non-contact communication apparatus, and it communicates non-contact with this and another non-contact communication apparatus. The non-contact communication device is a non-contact communication module 150 such as NFC (Near Field Communication) mounted on a mobile phone. Another non-contact communication apparatus is, for example, a reader / writer 140 in a non-contact communication system.

As shown in FIG. 8, the non-contact communication module 150 includes a secondary antenna unit 160 including a resonance circuit including a resonance capacitor and the antenna device 10 functioning as a resonance coil. In order to use the AC signal transmitted from the reader / writer 140 as a power source for each block, the non-contact communication module 150 generates a voltage corresponding to each block, and a rectification unit 166 that rectifies and converts the AC signal into DC power. A constant voltage unit 167. The non-contact communication module 150 includes a demodulation unit 164, a modulation unit 163, and a reception control unit 165 that operate by DC power supplied from the constant voltage unit 167, and a system control unit 161 that controls the overall operation. It has. The signal received by the secondary antenna unit 160 is demodulated by the demodulator together with the DC power conversion by the rectification unit 166, and the transmission data from the reader / writer 140 is analyzed by the system control unit 161. Further, transmission data of the non-contact communication module 150 is generated by the system control unit 161, and the transmission data is modulated into a signal to be transmitted to the reader / writer 140 by the modulation unit 163 and is transmitted via the secondary antenna unit 160. Sent. The reception control unit 165 generates a signal for adjusting the resonance frequency of the secondary antenna unit 160 based on the control of the system control unit 161 and adjusts the resonance frequency according to the communication state. Can do.

In addition, the reader / writer 140 of the non-contact communication system includes a primary side antenna unit 120 including a resonance circuit having a variable capacitance circuit composed of a resonance capacitor and the antenna device 10. The reader / writer 140 is modulated by a system control unit 121 that controls the operation of the reader / writer 140, a modulation unit 124 that modulates a transmission signal based on a command from the system control unit 121, and a transmission signal from the modulation unit 124. And a transmission signal unit 125 for transmitting the carrier signal to the primary antenna unit 120. The reader / writer 140 further includes a demodulator 123 that demodulates the modulated carrier signal transmitted by the transmission signal unit 125.

FIG. 9 shows a configuration example of the secondary side antenna unit 160. The secondary side antenna unit 160 includes a series-parallel resonant circuit including variable capacitance capacitors CS1, CP1, CS2, and CP2 that form a resonance capacitor and an antenna device 10 that forms an inductance. The primary antenna unit 120 has the same configuration.

Each capacitor CS1, CP1, CS2, CP2 of the variable capacitance circuit is controlled to have a DC bias voltage by the reception control unit 165 (in the case of the reader / writer 140, the transmission / reception control unit 122), set to an appropriate capacitance value, and the antenna. The resonance frequency is adjusted together with the device 10 (Lant).

<Operation of non-contact communication device>
Next, operations of the reader / writer 140 and the non-contact communication module 150 each including the primary side antenna unit 120 and the secondary side antenna unit 160 formed of a resonance circuit including the antenna device 10 will be described.

The reader / writer 140 performs impedance matching with the primary antenna unit 120 based on the carrier signal transmitted by the transmission signal unit 125, and based on the reception state of the non-contact communication module 150 on the reception side, Adjust the resonance frequency. In the modulation unit 124, a modulation method and a coding method used in a general reader / writer are a Manchester coding method, an ASK (Amplitude Shift Keying) modulation method, and the like. The carrier frequency is typically 13.56 MHz.

The transmission / reception control unit 122 monitors the transmission voltage and transmission current to control the variable voltage Vc of the primary antenna unit 120 so that impedance matching is obtained, and adjusts the impedance of the transmitted carrier signal.

The signal transmitted from the reader / writer 140 is received by the secondary antenna unit 160 of the non-contact communication module 150, and the signal is demodulated by the demodulation unit 164. The content of the demodulated signal is determined by the system control unit 161, and the system control unit 161 generates a response signal based on the result. The reception control unit 165 adjusts the resonance frequency and the like of the secondary antenna unit 160 based on the amplitude and voltage / current phase of the received signal so as to optimize the reception state. can do.

The non-contact communication module 150 modulates the response signal by the modulation unit 163 and transmits the response signal to the reader / writer 140 by the secondary side antenna unit 160. The reader / writer 140 demodulates the response signal received by the primary antenna unit 120 by the demodulation unit 123, and executes necessary processing by the system control unit 121 based on the demodulated contents.

<Configuration example of non-contact charging device and power receiving device>
A resonance circuit using the antenna device 10 according to the present invention can constitute a power receiving device 190 that charges a secondary battery built in a mobile terminal such as a mobile phone in a contactless manner by the contactless charging device 180. As a non-contact charging method, an electromagnetic induction method, magnetic resonance, or the like can be applied.

FIG. 10 shows a configuration example of a non-contact charging system including a power receiving device 190 such as a portable terminal to which the present invention is applied and a non-contact charging device 180 that charges the power receiving device 190 in a non-contact manner.

The power receiving apparatus 190 has substantially the same configuration as the non-contact communication module 150 described above. The configuration of the non-contact charging device 180 is almost the same as the configuration of the reader / writer 140 described above. Accordingly, the reader / writer 140 and the non-contact communication module 150 having the same functions as the blocks described in FIG. Here, in the reader / writer 140, the carrier frequency to be transmitted / received is 13.56 MHz in many cases, whereas in the non-contact charging device 180, the frequency may be 100 kHz to several hundred kHz.

The non-contact charging device 180 performs impedance matching with the primary antenna unit 120 based on the carrier signal transmitted by the transmission signal unit 125, and resonates based on the reception state of the non-contact communication module on the receiving side. Adjust the resonant frequency of the circuit.

The transmission / reception control unit 122 monitors the transmission voltage and transmission current to control the variable voltage Vc of the primary antenna unit 120 so that impedance matching is obtained, and adjusts the impedance of the transmitted carrier signal.

The power receiving device 190 rectifies the signal received by the secondary antenna unit 160 by the rectifying unit 166, and charges the battery 169 with the rectified DC voltage according to the control of the charging control unit 170. Even when no signal is received by the secondary antenna unit 160, the battery 169 can be charged by driving the charging control unit 170 by an external power source 168 such as an AC adapter.

The signal transmitted from the non-contact charging device 180 is received by the secondary side antenna unit 160, and the signal is demodulated by the demodulation unit 164. The content of the demodulated signal is determined by the system control unit 161, and the system control unit 161 generates a response signal based on the result. The reception control unit 165 adjusts the resonance frequency and the like of the secondary antenna unit 160 based on the amplitude and voltage / current phase of the received signal so as to optimize the reception state. can do.

[Characteristic evaluation of antenna device when magnetic particle shape is set]
In the non-contact charging system, the relative position between the primary antenna and the secondary antenna affects the power transmission efficiency. For this reason, a powerful magnet is arranged in the charging device so that the charging device (primary side) and the power receiving device (secondary side) can be placed close to each other, and the primary antenna of the charging device receives power. Some have been devised to draw the secondary antenna of the device (design A1 described in Non-Patent Document 2). In order to quantify the effect of the magnetic resin layer on the DC magnetic field generated by such a strong magnet, the following characteristic evaluation was performed.

For the antenna device 10 according to the embodiment of the present invention, the characteristics when the magnetic resin layer 4b was used were evaluated as the influence of magnetic saturation on the inductance value of the coil. Specifically, the characteristic evaluation was performed by measuring the inductance value of a single coil shown in FIG. 11A. FIG. 11B shows a cross section of the antenna device 10g for characteristic evaluation. The antenna device 10g includes a loop antenna element 2 formed by a conductive wire 1 wound in a rectangular shape, and a magnetic resin layer 4b having a predetermined thickness connected to the loop antenna element 2 via an adhesive layer 5. Prepare. Moreover, it has the leader lines 3a and 3b for electrical connection with the loop antenna element 2 and an external circuit. The lead wire 3a on the inner diameter side of the loop antenna element 2 is drawn to the outside through a notch 26 formed in the magnetic resin layer 4b. FIG. 11C shows a configuration of an antenna device 10h for characteristic evaluation for measuring the influence on the magnetic characteristics when a magnetic layer 4c described later is further added.

The measurement environment is shown in FIGS. 12A and 12B.

FIG. 12A shows a configuration of a receiving coil unit that evaluates a state without an external DC magnetic field. The power receiving coil unit is an antenna device 10g for characteristic evaluation, and includes a loop antenna element 2 and a magnetic resin layer 4b. A metal plate 31 simulating a battery pack was disposed on the surface of the magnetic resin layer 4b opposite to the surface on which the loop antenna element 2 is mounted. The power receiving coil unit is a 14T rectangular coil (outer diameter 31 × 43 mm).

FIG. 12B shows a configuration of a receiving coil unit that evaluates a state where there is an external DC magnetic field by a magnet. As in the case of FIG. 12A, the power receiving coil unit is an antenna device 10h for evaluation, and includes a loop antenna element 2 and a magnetic resin layer 4b. A metal plate 31 simulating a battery pack was disposed on the surface of the magnetic resin layer 4b opposite to the surface on which the loop antenna element 2 is mounted. The power transmission coil unit was disposed so as to face the power reception coil unit. The power transmission coil unit includes a spiral coil 30a and a magnetic shield material 30b, and is arranged so that the center and the central axis of the power reception coil unit are aligned. A magnet 40 for generating a DC magnetic field is arranged at the center of the power transmission coil unit 30. The transmission coil unit to which this magnet is attached is created based on the design A1 described in Non-Patent Document 2. The power receiving coil unit and the power transmitting coil unit were arranged to face each other with a 2.5 mm acrylic plate therebetween. Using an impedance analyzer 4294A manufactured by Agilent, the inductance value of the coil was measured by changing the configuration of the magnetic resin layer 4b in each case.

First, the inductance value of the antenna device 10g having a magnetic shield layer composed only of the magnetic resin layer 4b as shown in FIG. 11B was measured.

FIG. 13A, FIG. 13B, FIG. 14A, and FIG. 14B show graphs in which the inductance value of the power receiving coil unit equipped with a magnetic shield layer using various magnetic materials is measured. The amount of change in the measured inductance value in the presence of a DC magnetic field with respect to the measured inductance value in the absence of a DC magnetic field is expressed as a percentage and is referred to as a relative inductance value ΔL. The relative value ΔL of the inductance was plotted while changing the thickness tm of the magnetic resin layer 4b. A negative inductance relative value ΔL indicates that the inductance value has decreased, and a positive value indicates that the inductance value has increased.

<Example 1>
FIG. 13A shows the relative value ΔL of the inductance when the magnetic resin layer 4b having an average permeability of about 20 in which a spherical amorphous powder having a dimensional ratio (major axis / minor axis) of 6 or less is used as the magnetic resin layer 4b. Indicates.

<Example 2>
FIG. 13B shows a relative inductance value ΔL when the magnetic resin layer 4b is a magnetic resin layer 4b having an average magnetic permeability of about 16 blended with spherical sendust powder having a dimensional ratio (major axis / minor axis) of 6 or less. Indicates.

<Comparative Example 1>
FIG. 14A shows a case where a magnetic sheet having an average permeability of about 100 prepared by mixing flat powder having a sendust-based dimensional ratio (major axis / minor axis) of about 50 with a binder is used as the magnetic shield layer. Indicates the relative value of inductance.

<Comparative example 2>
FIG. 14B shows the relative value of the inductance when MnZn-based bulk ferrite having a magnetic permeability of about 1500 is used as the magnetic shield layer.

<Result>
As shown in FIGS. 13A and 13B, in the configuration example of the embodiment of the present invention in which the magnetic resin layer 4b using spherical magnetic powder is used as the magnetic shield layer, the inductance value of the coil is applied with a DC magnetic field. It has not decreased so much. The reason why the relative value ΔL of the inductance is positive is that the magnetic shield layer constituting the power transmission coil unit is large, so that the magnetic flux is concentrated in the vicinity of the power reception coil unit.

On the other hand, as shown in FIG. 14A, when a magnetic sheet made of flat magnetic powder is used as the magnetic shield layer, the magnetic shield layer is magnetically saturated due to the influence of the DC magnetic field of the magnet mounted on the transmission coil unit. And the inductance value is greatly reduced. This shows that this tendency is more remarkable because the thinner the shield layer, the more likely it is to become magnetically saturated.

As shown in FIG. 14B, it is shown that when ferrite is used as the magnetic shield layer, the inductance value is greatly reduced as in the case of FIG. 14A.

By adopting the configuration of the present invention as described above, the change in coil inductance is small even in a magnet-mounted transmission coil unit or in an environment with a large DC magnetic field, and thus the change in the resonance frequency of the power receiving module is small and stable. Power transmission is possible.

[Evaluation of antenna device characteristics when a magnetic layer is added]
The same receiving coil unit as that shown in FIGS. 12A and 12B used in the evaluation of the antenna device described above was used. The power receiving coil unit is a 14T rectangular coil (outer diameter 31 mm × 43 mm).

As a characteristic evaluation method, as shown in FIG. 11B and FIG. 11C, when only the magnetic resin layer 4b is used as the magnetic shield layer (FIG. 11B), a 50 μm thick magnetic layer 4c is formed on the lower surface of the magnetic resin layer 4b. In the case of pasting (FIG. 11C), the inductance value of each coil was measured. In these cases, the inductance value was measured by changing the thickness of the magnetic resin layer 4b. Therefore, the total thickness of the magnetic shield layer is the magnetic resin layer 4b plus the thickness of the magnetic layer 4c of 50 μm.

For the magnetic resin layer 4b of the power receiving coil unit (evaluation antenna apparatus 10h), one having an average magnetic permeability of about 30 blended with spherical amorphous powder having a size ratio of 6 or less is used, and for the magnetic layer 4c, a sendust-based one is used. A powder having a magnetic permeability of about 100 was prepared by mixing flat powder having a size ratio of about 50 with a binder.

15A and 15B are graphs plotting the inductance value L with respect to the thickness tm of the magnetic shield layer 4. The inductance value was measured using an impedance analyzer 4294A manufactured by Agilent, and plotted as an inductance value L at a frequency of 120 kHz generally used in a non-contact charging system.

<Example 3>
FIG. 15A shows a measurement result of the inductance value L of the coil when no DC magnetic field is applied, that is, in the case of the configuration of the power receiving coil unit of FIG. 12A. FIG. 15B shows the measurement result of the inductance value L in the case of the configuration of the receiving coil unit of FIG. 12B in which a DC magnetic field is applied by a magnet.

As shown in FIG. 15A, when there is no DC magnetic field, the inductance value of the coil can be improved by replacing a part of the magnetic resin layer 4b with the thin magnetic layer 4c.

On the other hand, as shown in FIG. 15B, when a DC magnetic field is applied by a magnet, the influence of magnetic saturation is large, so that the inductance value is reduced for all coils. The magnetic layer 4c has a higher effect of increasing the inductance than the magnetic resin layer 4b. On the contrary, the magnetic resin layer 4b has a higher effect of improving the inductance when a strong magnetic field is applied. By adjusting the ratio, the coil inductance that strongly influences the magnetic shielding properties and the circuit resonance conditions and the magnetic saturation characteristics thereof can be adjusted to the desired performance.

Thus, since the antenna device of the present invention has a magnetic resin layer that is strong against magnetic saturation, it is possible to stably supply power with little change in coil inductance even in an environment where a strong magnetic field is applied. Furthermore, by adjusting the thicknesses of the magnetic resin layer and the magnetic layer, the balance between the magnitude of the coil inductance and the rate of change of the coil inductance under a strong magnetic field environment can be adjusted. It can be used not only for non-contact communication but also for non-contact power transmission (non-contact charging), and each loop antenna part and antenna part can be optimally designed according to the application and the electronic equipment installed. it can.

1,11,21 conducting wire, 2 loop antenna element, 12, 22 antenna element, 3 loop antenna part, 13, 23 antenna part, 3a, 3b lead wire, 4 magnetic shield layer, 4a, 4b magnetic resin layer, 4c magnetic layer 4d magnetic sheet, 5 adhesive layer, 6 drawer part, 7 spacer, 8 support base material, 10, 10a to 10f antenna device, 10g, 10h characteristic evaluation antenna device, 26 notch part, 30 transmission coil unit, 30a spiral coil 30b magnetic shield, 31 metal plate, 40 magnet, 120 primary antenna unit, 121 system control unit, 122 transmission / reception control unit, 123 demodulation unit, 124 modulation unit, 125 transmission signal unit, 140 non-contact communication device, 150 non-contact Contact communication module, 160 secondary antenna section, 61 system control unit, 163 modulation unit, 164 demodulation unit, 165 reception control unit, 166 rectifier, 167 constant voltage unit, 168 external power supply, 169 battery, 170 charging control unit, 180 a non-contact charging device, 190 power receiving device

Claims (15)

1. An antenna having a top surface;
   A loop antenna disposed on the top surface of the antenna,
   The antenna and the loop antenna have one or more magnetic resin layers containing magnetic particles and resin,
   The antenna device, wherein the antenna is disposed on an inner diameter of the loop antenna, and at least a part of the antenna is embedded in the magnetic resin layer.
2. 2. The antenna device according to claim 1, wherein the magnetic resin layer has flexibility by being formed by kneading the magnetic particles and resin.
3. 3. The antenna device according to claim 1, wherein at least one of the antenna and the loop antenna further includes a magnetic layer containing a magnetic material having a magnetic characteristic different from that of the magnetic resin layer.
4. The antenna device according to claim 1 or 2, wherein the antenna and the loop antenna are arranged so as to partially overlap each other.
5. The antenna device according to claim 1, further comprising another loop antenna disposed on an inner diameter of the loop antenna and stacked on the upper surface of the antenna.
6. 6. The antenna device according to claim 5, wherein at least one of the antenna and the other loop antenna is disposed so as to overlap each other.
7. 7. The antenna device according to claim 5, wherein at least one of the antenna, the loop antenna, and the other loop antenna is supported by a support member including a nonmagnetic material.
8. 7. The antenna apparatus according to claim 5, wherein at least one of the antenna, the loop antenna, and the other loop antenna is supported by a support member including a high thermal conductivity material.
9. The antenna is entirely embedded in the magnetic resin layer,
   3. The antenna device according to claim 1, wherein the loop antenna does not have the magnetic resin layer.
10. Of the one or more magnetic resin layers, at least one of the magnetic resin layers includes spherical or spheroidal magnetic particles having a dimensional ratio represented by a ratio of a major axis to a minor axis of 6 or less. The antenna device according to claim 1 or 2.
11. Among the one or more magnetic resin layers, at least one of the magnetic resin layers is spherical, or spheroidal magnetic particles having a dimensional ratio represented by a ratio of a major axis to a minor axis of 6 or less, a resin, and a lubricant The antenna device according to claim 10, wherein the antenna device is a dust core formed by mixing and compressing these.
12. 3. The antenna device according to claim 1, wherein the loop antenna is formed of a coil formed on at least one surface of a base material, and the other loop antenna is formed of a coil formed on the base material. .
13. The loop antenna includes a coil formed on at least one surface of a base material, and the other loop antenna includes a coil formed on at least one surface of a base material different from the base material. 3. The antenna device according to 1 or 2.
14. 6. The antenna device according to claim 5, wherein one of the antenna, the loop antenna, and the other loop antenna is a non-contact power transmission antenna.
15. An electronic device comprising the antenna device according to any one of claims 1 to 14.

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