CN210443652U - Antenna device and electronic apparatus - Google Patents
Antenna device and electronic apparatus Download PDFInfo
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- CN210443652U CN210443652U CN201921785310.3U CN201921785310U CN210443652U CN 210443652 U CN210443652 U CN 210443652U CN 201921785310 U CN201921785310 U CN 201921785310U CN 210443652 U CN210443652 U CN 210443652U
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Abstract
The utility model relates to an antenna device and electronic equipment. The antenna device (1) is provided with a power supply coil (2) and a planar antenna (3). The power supply coil (2) includes a coil conductor (21) having a1 st coil conductor end (23) and a2 nd coil conductor end (24). The planar antenna (3) includes a1 st winding part (51) having a1 st opening (53) and a2 nd winding part (52) having a2 nd opening (54), and is magnetically coupled to the power supply coil (2). When the planar antenna (3) is viewed in a plan view, the winding part (51) 1 and the winding part (52) 2 of the planar antenna (3) are wound in opposite phases to each other. When the planar antenna (3) is viewed in plan, the 1 st coil conductor end (23) of the coil conductor (21) is closer to the 1 st opening (53) than the 2 nd opening (54) of the planar antenna (3), and the 2 nd coil conductor end (24) of the coil conductor (21) is closer to the 2 nd opening (54) than the 1 st opening (53) of the planar antenna (3). This can improve the degree of freedom in the arrangement of the power supply coil.
Description
Technical Field
The present invention relates generally to an antenna device and an electronic apparatus, and more particularly to an antenna device including a power supply coil and a planar antenna, and an electronic apparatus including the antenna device.
Background
Conventionally, an antenna device is known which performs communication by magnetically coupling a feeding coil and a planar antenna (for example, see patent document 1).
The antenna device described in patent document 1 includes a coil antenna (power supply coil) and a booster antenna (planar antenna). The coil antenna and the booster antenna are coupled via a magnetic field.
Prior art documents
Patent document
Patent document 1: international publication No. 2012/033031
SUMMERY OF THE UTILITY MODEL
Problem to be solved by utility model
However, in the conventional antenna device described in patent document 1, in order to couple the planar antenna and the feeding coil, it is necessary to bring the planar antenna and the feeding coil close to each other.
Since the feeding coil needs to be arranged near the outer shape of the planar antenna, the degree of freedom in the arrangement of the feeding coil is limited.
The present invention has been made in view of the above problems, and an object of the present invention is to provide an antenna device and an electronic apparatus that can improve the degree of freedom in the configuration of a power supply coil.
Means for solving the problems
The utility model discloses an antenna device that mode relates possesses power supply coil and planar antenna. The power supply coil includes a coil conductor having a1 st coil conductor end and a2 nd coil conductor end. The planar antenna includes a1 st winding portion having a1 st opening and a2 nd winding portion having a2 nd opening, and is magnetically coupled to the power supply coil. The winding portions 1 and 2 of the planar antenna are wound in opposite phases to each other when the planar antenna is viewed in plan. When the planar antenna is viewed in plan, the 1 st coil conductor end of the coil conductor is closer to the 1 st opening than the 2 nd opening of the planar antenna, and the 2 nd coil conductor end of the coil conductor is closer to the 2 nd opening than the 1 st opening of the planar antenna.
An electronic device according to one aspect of the present invention includes the antenna device and the housing. The antenna device is arranged on the shell.
Effect of the utility model
According to the antenna device and the electronic apparatus of the present invention, the degree of freedom of the arrangement of the power supply coil can be improved.
Drawings
Fig. 1 is a plan view of an antenna device according to embodiment 1.
Fig. 2A is a plan view of the 1 st coil conductor in the antenna device according to embodiment 1. Fig. 2B is a plan view of the 2 nd coil conductor in the antenna device according to embodiment 1.
Fig. 3 is an equivalent circuit diagram of the antenna device according to embodiment 1.
Fig. 4 is a schematic diagram of the antenna device according to embodiment 1.
Fig. 5A is a plan view of the antenna device according to modification 1 of embodiment 1. Fig. 5B is a plan view of the antenna device according to modification 2 of embodiment 1. Fig. 5C is a plan view of the antenna device according to modification 3 of embodiment 1.
Fig. 6 is a plan view of the antenna device according to embodiment 2.
Fig. 7 is a plan view of an antenna device according to a modification of embodiment 2.
Fig. 8A is a perspective view of an electronic device according to embodiment 3. Fig. 8B is a cross-sectional view taken along line X1-X1 in fig. 8A in the electronic device according to embodiment 3.
Fig. 9 is a schematic diagram of main parts of an electronic device according to embodiment 3.
Fig. 10A is a schematic diagram of an antenna device according to modification 1 of embodiment 3. Fig. 10B is a schematic diagram of an antenna device according to modification 2 of embodiment 3.
Fig. 11 is a perspective view of an electronic device according to modification 3 of embodiment 3.
Fig. 12A and 12B are exploded views of an electronic device according to modification 3 of embodiment 3.
-description of symbols-
1. 1a, 1b antenna device
2 coil for power supply
21 coil conductor
23 st coil conductor end
24 nd coil 2 conductor end
3. 3a, 3b planar antenna
51 st winding part
52 nd winding part
53 opening 1 st
54 nd 2 nd opening
55. 56 planar conductor portion
61 rd 3 winding part
62 th winding part
63 opening No. 3
64 th opening
7. 7b electronic device
71. 71b casing (plane conductor)
711 1 st shell end
712 2 nd shell end
713 inner surface
714 outer surface
715. 716 through hole.
Detailed Description
Hereinafter, the antenna devices according to embodiments 1 and 2 and the electronic device according to embodiment 3 will be described with reference to the drawings. Fig. 1, 2A, 2B, 4, 5A to 5C, 6, 7, 8A, 8B, 9, 10A, 10B, 11, 12A, and 12B, which are referred to in the following embodiments and the like, are schematic diagrams, and the respective ratios of the size and thickness of each component in the diagrams do not necessarily reflect the actual dimensional ratios.
The "antenna device" shown in each embodiment is an antenna device used for performing near field communication using magnetic field coupling. The antenna device is applied to, for example, NFC (Near Field Communication) or the like. In other words, the "antenna device" described in each embodiment is used in a wireless transmission system using at least communication by magnetic field coupling. The "antenna device" described in each embodiment includes a device that performs wireless transmission with an antenna device of an external device substantially by magnetic field coupling. The size of the coil antenna of the antenna device is sufficiently smaller than the wavelength λ in the frequency used, and the radiation efficiency of the electromagnetic wave in the frequency band used is low. The size of the coil antenna is lambda/10 or less. More specifically, the length of the current path of the coil antenna, i.e., the line length of the coil conductor described later, is λ/10 or less. The wavelength λ mentioned here represents an effective wavelength considering a wavelength shortening effect due to the dielectric properties and the permeability of the base material on which the conductor is formed. Both ends of a coil conductor included in the coil antenna are connected to a feeding circuit, and a current of substantially the same magnitude flows through the coil antenna along a current path, i.e., the coil conductor.
The "antenna device" shown in each embodiment is used, for example, in a short band (HF band), particularly, in a band around 13.56MHz or 6.78MHz or a frequency thereof used for NFC.
(embodiment mode 1)
(1) Integral structure of antenna device
The overall configuration of the antenna device 1 according to embodiment 1 will be described with reference to the drawings.
As shown in fig. 1, an antenna device 1 according to embodiment 1 includes a feeding coil 2 and a planar antenna 3.
The antenna device 1 as described above is mounted on the electronic device 7 (see fig. 8A) and used, and performs wireless communication with an antenna device of an external device (not shown).
(2) Each structural element of the antenna device
Hereinafter, each component of the antenna device 1 according to embodiment 1 will be described with reference to the drawings.
(2.1) Power supply coil
As shown in fig. 1, the power supply coil 2 includes a coil conductor 21 and a magnetic core 22. The coil conductor 21 has a1 st coil conductor end 23 and a2 nd coil conductor end 24 in the winding axis direction of the coil conductor 21. The power supply coil 2 may be formed of, for example, a laminate in which insulating layers having conductor patterns formed thereon are laminated, or the power supply coil 2 may be a wound coil in which a conductor wire is wound around a magnetic core. Here, the coil conductor end refers to an outermost annular conductor in the winding axis direction of a coil conductor formed by a plurality of continuous annular conductors.
(2.2) planar antenna
As shown in fig. 1, the planar antenna 3 includes a base 4, a1 st coil conductor 5, and a2 nd coil conductor 6. The planar antenna 3 is magnetically coupled to the power supply coil 2.
(2.2.1) base Material
As shown in fig. 1, the base material 4 is formed in a plate shape or a sheet shape from an electrically insulating material such as resin. The base material 4 has a rectangular shape when viewed from the thickness direction in a plan view. The substrate 4 has a1 st main surface 41 and a2 nd main surface 42 opposed to each other in the thickness direction. The electrically insulating material used for the substrate 4 is, for example, polyimide, PET (polyethylene Terephthalate) or Liquid Crystal Polymer (LCP).
(2.2.2) the 1 st coil conductor
As shown in fig. 2A, the 1 st coil conductor 5 has a1 st winding portion 51 and a2 nd winding portion 52. The 1 st coil conductor 5 is formed of copper, aluminum, or the like. For example, by etching or printing, a copper film or an aluminum film is formed on the 1 st main surface 41 of the base 4, and the 1 st coil conductor 5 is provided on the base 4.
The 1 st winding portion 51 is annular and has a1 st opening 53. The 1 st winding portion 51 is a conductor having a long and narrow shape (linear shape), and is provided in a spiral shape, for example. More specifically, the 1 st winding part 51 is provided in a state in which a plurality of turns are wound. For example, the 1 st winding portion 51 is provided in a state in which 3 turns are wound. Here, in the 1 st winding part 51, "provided in a state of being wound with N turns" means not only a case of including a long and thin shaped (linear) lead wire wound with N turns, but also a case of forming a conductor pattern in a long and thin shape (linear) into a shape wound with N turns. The 1 st winding portion 51 may be a 1-circumference annular conductor.
The 2 nd winding portion 52 is annular and has a2 nd opening 54. The 2 nd winding portion 52 is a conductor having a long and narrow shape (linear shape), and is provided in a spiral shape, for example. More specifically, the 2 nd winding portion 52 is provided in a state in which a plurality of turns are wound. For example, the 2 nd winding portion 52 is provided in a state in which 3 turns are wound. Here, in the 2 nd winding part 52, "provided in a state of being wound with N turns" means not only a case where N turns of a long and thin shape (linear shape) of a lead wire are wound but also a case where a long and thin shape (linear shape) of a conductor pattern is formed in a shape of being wound with N turns. The 2 nd winding portion 52 may be a 1-circumference annular conductor.
The 1 st winding portion 51 and the 2 nd winding portion 52 provided in a spiral shape may be formed by spirally winding a plurality of turns around a winding axis on one plane. In other words, the 1 st coil conductor 5 may be a two-dimensional coil antenna. Alternatively, the 1 st winding portion 51 and the 2 nd winding portion 52 provided in a spiral shape may be formed by spirally winding a plurality of turns around the winding shaft along the winding shaft. In other words, the 1 st coil conductor 5 may be a three-dimensional coil antenna. Fig. 2A shows a case where the 1 st coil conductor 5 is a two-dimensional coil antenna.
The 1 st winding portion 51 and the 2 nd winding portion 52 are wound in opposite phases to each other when the planar antenna 3 is viewed in plan. In the present specification, the phrase "the 1 st winding portion 51 and the 2 nd winding portion 52 are opposite in phase to each other" means that the direction of the magnetic flux in the winding axis direction of the 1 st winding portion 51 generated by the current flowing through the 1 st winding portion 51 and the direction of the magnetic flux in the winding axis direction of the 2 nd winding portion 52 generated by the current flowing through the 2 nd winding portion 52 are opposite to each other. In other words, the 1 st winding portion 51 and the 2 nd winding portion 52 are wound such that the magnetic flux in the winding axis direction of the 1 st winding portion 51 and the magnetic flux in the winding axis direction of the 2 nd winding portion 52 are opposite to each other.
However, the 1 st coil conductor 5 also has a plurality of (two in the illustrated example) planar conductor portions 55, 56.
The planar conductor portion 55 is provided on the inner peripheral side of the 1 st winding portion 51 and is connected to the leading end of the 1 st winding portion 51. In other words, the planar conductor portion 55 is provided integrally with the 1 st winding portion 51. The flat conductor portion 56 is provided on the inner peripheral side of the 2 nd winding portion 52 and connected to the leading end of the 2 nd winding portion 52. In other words, the planar conductor portion 56 is provided integrally with the 2 nd winding portion 52.
The planar conductor portion 55 is located at the innermost periphery of the 1 st winding portion 51. The planar conductor portion 56 is located at the innermost periphery of the 2 nd winding portion 52. Thus, in the planar antenna 3, the 8-shaped structure in which the 1 st winding portion 51 and the 2 nd winding portion 52 are opposite in phase to each other can be easily configured. On the other hand, when the planar conductor portion is provided on the outer periphery of the 1 st winding portion 51 or the 2 nd winding portion 52, another path for connecting the inner periphery of the 1 st winding portion 51 and the inner periphery of the 2 nd winding portion 52 is necessary, and the structure of the 8-shaped structure becomes complicated.
However, the planar conductor portions 55 and 56 face the intermediate portion 57 in a direction orthogonal to the winding axis direction of the planar antenna 3. The intermediate portion 57 is a coupling portion of the 1 st coil conductor 5 that is mainly magnetically coupled to the power supply coil 2. More specifically, the intermediate portion 57 is a portion of the 1 st winding portion 51 and the 2 nd winding portion 52 of the 1 st coil conductor 5 that is mainly magnetically coupled to the power supply coil 2.
(2.2.3) No. 2 coil conductor
As shown in fig. 2B, the 2 nd coil conductor 6 has a 3 rd winding portion 61 and a 4 th winding portion 62. The 2 nd coil conductor 6 is formed of copper, aluminum, or the like. For example, a copper film or an aluminum film is formed on the 2 nd main surface 42 of the base 4 by etching or printing, whereby the 2 nd coil conductor 6 is provided on the base 4.
The 3 rd winding portion 61 is annular and has a 3 rd opening 63. The 3 rd winding portion 61 is a conductor having a long and narrow shape (linear shape), and is provided in a spiral shape, for example. More specifically, the 3 rd winding portion 61 is provided in a state in which a plurality of turns are wound. For example, the 3 rd winding portion 61 is provided in a state in which 3 turns are wound. Here, in the 3 rd winding part 61, "provided in a state of being wound with N turns" means not only a case of including a long and thin shaped (linear) lead wire wound with N turns, but also a case of forming a conductor pattern in a long and thin shape (linear) into a shape wound with N turns. The 3 rd winding portion 61 may be a 1-circumference annular conductor.
The 4 th winding portion 62 is annular and has a 4 th opening 64. The 4 th winding portion 62 is a conductor having a long and narrow shape (linear shape), and is provided in a spiral shape, for example. More specifically, the 4 th winding part 62 is provided in a state in which a plurality of turns are wound. For example, the 4 th winding part 62 is provided in a state in which 3 turns are wound. Here, in the 4 th winding part 62, "provided in a state of being wound with N turns" means not only a case of including a long and thin shaped (linear) lead wire wound with N turns, but also a case of forming a conductor pattern in a long and thin shape (linear) into a shape wound with N turns. The 4 th winding part 62 may be a 1-circumference annular conductor.
The 3 rd winding portion 61 and the 4 th winding portion 62 provided in a spiral shape may be formed by spirally winding a plurality of turns around a winding axis on one plane. In other words, the 2 nd coil conductor 6 may be a two-dimensional coil antenna. Alternatively, the 3 rd winding portion 61 and the 4 th winding portion 62 provided in a spiral shape may be formed by winding a plurality of turns spirally around the winding shaft. In other words, the 2 nd coil conductor 6 may be a three-dimensional coil antenna. Fig. 2B shows a case where the 2 nd coil conductor 6 is a two-dimensional coil antenna.
The 3 rd winding portion 61 and the 4 th winding portion 62 are wound in opposite phases to each other when the planar antenna 3 is viewed in plan. In the present specification, the phrase "the 3 rd winding portion 61 and the 4 th winding portion 62 are opposite in phase to each other" means that the direction of the magnetic flux in the winding axis direction of the 3 rd winding portion 61 generated by the current flowing through the 3 rd winding portion 61 and the direction of the magnetic flux in the winding axis direction of the 4 th winding portion 62 generated by the current flowing through the 4 th winding portion 62 are opposite to each other. In other words, the 3 rd winding portion 61 and the 4 th winding portion 62 are wound such that the magnetic flux in the winding axis direction of the 3 rd winding portion 61 and the magnetic flux in the winding axis direction of the 4 th winding portion 62 are opposite to each other.
The 3 rd winding portion 61 is provided so that the 3 rd opening 63 overlaps the 1 st opening 53 in the winding axis direction of the planar antenna 3. The 4 th wound portion 62 is provided so that the 4 th opening 64 overlaps the 2 nd opening 54 in the winding axis direction. Accordingly, the 1 st winding portion 51 overlaps the 3 rd winding portion 61, and the 2 nd winding portion 52 overlaps the 4 th winding portion 62, so that it is easy to secure a capacitance component between the 1 st winding portion 51 and the 3 rd winding portion 61 and between the 2 nd winding portion 52 and the 4 th winding portion 62. As a result, the antenna device 1 can be downsized.
However, the 2 nd coil conductor 6 further has a plurality of (two in the illustrated example) planar conductor portions 65 and 66.
The planar conductor portion 65 is provided on the inner peripheral side of the 3 rd winding portion 61 and is connected to the leading end of the 3 rd winding portion 61. In other words, the planar conductor portion 65 is provided integrally with the 3 rd winding portion 61. The flat conductor portion 66 is provided on the inner peripheral side of the 4 th wound portion 62 and is connected to the tip of the 4 th wound portion 62. In other words, the planar conductor portion 66 is provided integrally with the 4 th winding portion 62.
The planar conductor portion 65 is located at the innermost periphery of the 3 rd winding portion 61. The planar conductor portion 66 is located at the innermost periphery of the 4 th winding portion 62. Thus, in the planar antenna 3, the 8-shaped structure in which the 3 rd winding portion 61 and the 4 th winding portion 62 are opposite in phase to each other can be easily configured. On the other hand, when the planar conductor portion is provided on the outer periphery of the 3 rd wound portion 61 or the 4 th wound portion 62, another path for connecting the inner periphery of the 3 rd wound portion 61 and the inner periphery of the 4 th wound portion 62 is necessary, and the structure of the 8-shaped structure becomes complicated.
The planar conductor portion 65 faces the planar conductor portion 55 in the winding axis direction of the planar antenna 3. Thereby, a capacitance component is formed between the planar conductor portion 55 and the planar conductor portion 65. The planar conductor portion 66 faces the planar conductor portion 56 in the winding axis direction of the planar antenna 3. Thereby, a capacitance component is formed between the planar conductor portion 56 and the planar conductor portion 66.
As described above, in the antenna device 1, since the capacitance component can be easily formed, the antenna device 1 can be downsized as compared with a case where a capacitor is separately provided.
However, the planar conductor portions 65 and 66 face the intermediate portion 67 in a direction orthogonal to the winding axis direction of the planar antenna 3. The intermediate portion 67 is a coupling portion of the 2 nd coil conductor 6 that mainly magnetically couples with the power supply coil 2. More specifically, the intermediate portion 67 is a portion of the 2 nd coil conductor 6 that is mainly magnetically coupled to the power supply coil 2 in the 3 rd winding portion 61 and the 4 th winding portion 62.
(2.2.4) equivalent circuit of planar antenna
The planar antenna 3 having the above-described configuration has an equivalent circuit as shown in fig. 3. The equivalent circuit shown in fig. 3 has a1 st inductor L51, a2 nd inductor L52, a 3 rd inductor L61, a 4 th inductor L62, a1 st capacitor C1, and a2 nd capacitor C2.
The 1 st inductor L51 is connected in series with the 2 nd inductor L52, and the 3 rd inductor L61 is connected in series with the 4 th inductor L62. A series circuit of the 1 st inductor L51 and the 2 nd inductor L52 is connected in parallel with a series circuit of the 3 rd inductor L61 and the 4 th inductor L62. The 1 st terminal of the 1 st capacitor C1 is connected to the 1 st inductor L51, and the 2 nd terminal of the 1 st capacitor C1 is connected to the 3 rd inductor L61. The 1 st terminal of the 2 nd capacitor C2 is connected to the 2 nd inductor L52, and the 2 nd terminal of the 2 nd capacitor C2 is connected to the 4 th inductor L62.
The 1 st inductor L51 is an inductance component of the 1 st winding part 51 of the 1 st coil conductor 5, and the 2 nd inductor L52 is an inductance component of the 2 nd winding part 52 of the 1 st coil conductor 5. The 3 rd inductor L61 is an inductance component of the 3 rd winding part 61 of the 2 nd coil conductor 6, and the 4 th inductor L62 is an inductance component of the 4 th winding part 62 of the 2 nd coil conductor 6.
The 1 st capacitor C1 is a capacitance component generated between the planar conductor portion 55 of the 1 st coil conductor 5 and the planar conductor portion 65 of the 2 nd coil conductor 6. The 2 nd capacitor C2 is a capacitance component generated between the planar conductor portion 56 of the 1 st coil conductor 5 and the planar conductor portion 66 of the 2 nd coil conductor 6. In addition, although a capacitance component exists in a portion where the 1 st coil conductor 5 and the 2 nd coil conductor 6 overlap with each other except between the planar conductor portions 55 and 56, only the 1 st capacitor C1 and the 2 nd capacitor C2 which are dominant in the equivalent circuit shown in fig. 3 are shown.
The planar antenna 3 constitutes a resonant circuit by forming an equivalent circuit as described above. The resonance circuit of the planar antenna 3 has a resonance frequency included in a communication band used when the antenna device 1 communicates with another antenna device. The planar antenna 3 has a resonance frequency near 13.56MHz, for example. The resonance frequency of the resonance circuit can be set by the inductance of each inductor (the 1 st inductor L51, the 2 nd inductor L52, the 3 rd inductor L61, and the 4 th inductor L62) and the capacitance of each capacitor (the 1 st capacitor C1 and the 2 nd capacitor C2).
The inductance of the 1 st inductor L51 is determined by the length (number of turns) and line width of the 1 st winding portion 51. The inductance of the 2 nd inductor L52 is determined by the length (number of turns) and line width of the 2 nd winding portion 52. The inductance of the 3 rd inductor L61 is determined by the length (number of turns) and line width of the 3 rd winding portion 61. The inductance of the 4 th inductor L62 is determined by the length (number of turns) and line width of the 4 th winding part 62. The capacitance of the 1 st capacitor C1 is determined by the areas of the planar conductor portion 55 and the planar conductor portion 65, the distance between the planar conductor portion 55 and the planar conductor portion 65, and the like. The capacitance of the 2 nd capacitor C2 is determined by the areas of the planar conductor portion 56 and the planar conductor portion 66, the distance between the planar conductor portion 56 and the planar conductor portion 66, and the like.
(2.3) positional relationship between feeding coil and planar antenna
As shown in fig. 4, when the planar antenna 3 is viewed in plan, the 1 st coil conductor end 23 of the coil conductor 21 in the feeding coil 2 is closer to the 1 st opening 53 than the 2 nd opening 54 of the planar antenna 3. In addition, in the planar antenna 3, the 2 nd coil conductor end 24 of the coil conductor 21 in the feeding coil 2 is closer to the 2 nd opening 54 than the 1 st opening 53 of the planar antenna 3 is when viewed in plan. In other words, the shortest distance a11 between the 1 st coil conductor end 23 of the coil conductor 21 and the 1 st opening 53 is shorter than the shortest distance a12 between the 1 st coil conductor end 23 of the coil conductor 21 and the 2 nd opening 54. Further, the shortest distance a22 between the 2 nd coil conductor end 24 of the coil conductor 21 and the 2 nd opening 54 is shorter than the shortest distance a21 between the 2 nd coil conductor end 24 of the coil conductor 21 and the 1 st opening 53.
Similarly, when the planar antenna 3 is viewed in plan, the 1 st coil conductor end 23 of the coil conductor 21 in the feeding coil 2 is closer to the 3 rd opening 63 than the 4 th opening 64 of the planar antenna 3. In addition, in the planar antenna 3, the 2 nd coil conductor end 24 of the coil conductor 21 in the feeding coil 2 is closer to the 4 th opening 64 than the 3 rd opening 63 of the planar antenna 3 is when viewed in plan. In other words, the shortest distance a13 between the 1 st coil conductor end 23 of the coil conductor 21 and the 3 rd opening 63 is shorter than the shortest distance a14 between the 1 st coil conductor end 23 of the coil conductor 21 and the 4 th opening 64. Further, the shortest distance a24 between the 2 nd coil conductor end 24 of the coil conductor 21 and the 4 th opening 64 is shorter than the shortest distance a23 between the 2 nd coil conductor end 24 of the coil conductor 21 and the 3 rd opening 63.
In addition, when the planar antenna 3 is viewed in plan, the 1 st coil conductor end 23 of the coil conductor 21 in the feeding coil 2 does not overlap the 1 st opening 53 of the planar antenna 3, and the 2 nd coil conductor end 24 of the coil conductor 21 in the feeding coil 2 does not overlap the 2 nd opening 54 of the planar antenna 3. Similarly, the 1 st coil conductor end 23 of the coil conductor 21 in the feeding coil 2 does not overlap the 3 rd opening 63 of the planar antenna 3, and the 2 nd coil conductor end 24 of the coil conductor 21 in the feeding coil 2 does not overlap the 4 th opening 64 of the planar antenna 3. In addition, when the planar antenna 3 is viewed in plan, the region of the feeding coil 2 where the coil conductor 21 is formed does not overlap the 1 st opening 53 and the 2 nd opening 54 of the planar antenna 3. Similarly, the region of the feeding coil 2 where the coil conductor 21 is formed does not overlap the 3 rd opening 63 and the 4 th opening 64 of the planar antenna 3. Accordingly, even if the positional relationship between the planar antenna 3 and the feeding coil 2 is slightly shifted, the variation in the degree of coupling between the planar antenna 3 and the feeding coil 2 can be reduced, and thus the characteristics of the antenna device 1 can be stabilized.
(3) Operation of antenna device
Hereinafter, the operation of the antenna device 1 will be described with reference to fig. 1.
First, when a current flows through the coil conductor 21 of the power supply coil 2, a magnetic flux is generated around the power supply coil 2. Since the feeding coil 2 is magnetically coupled to the planar antenna 3, a current flows through the 1 st coil conductor 5 and the 2 nd coil conductor 6 of the planar antenna 3 by a magnetic flux generated around the feeding coil 2. The current flows as shown by the arrows in fig. 1.
Since the 1 st coil conductor 5 and the 2 nd coil conductor 6 constitute a resonance circuit, a large current flows through the 1 st coil conductor 5 and the 2 nd coil conductor 6 in the vicinity of the resonance frequency. Magnetic flux is generated around the 1 st coil conductor 5 and the 2 nd coil conductor 6 by the current flowing through the 1 st coil conductor 5 and the 2 nd coil conductor 6. The magnetic flux is linked with the 1 st opening 53 of the 1 st coil conductor 5 and the 3 rd opening 63 of the 2 nd coil conductor 6 from the back side of the drawing sheet of fig. 1 toward the near side, and the magnetic flux is linked with the 2 nd opening 54 of the 1 st coil conductor 5 and the 4 th opening 64 of the 2 nd coil conductor 6 from the front side of the drawing sheet of fig. 1 toward the near side.
This allows a large magnetic flux to be radiated from the antenna device 1, thereby improving the accuracy of communication with a target antenna device (not shown).
(4) Effect
In the antenna device 1 according to embodiment 1, the 1 st coil conductor end 23 of the coil conductor 21 in the feeding coil 2 is closer to the 1 st opening 53 than the 2 nd opening 54 of the planar antenna 3. Further, the 2 nd coil conductor end 24 of the coil conductor 21 in the feeding coil 2 is closer to the 2 nd opening 54 than the 1 st opening 53 of the planar antenna 3. Similarly, the 1 st coil conductor end 23 of the coil conductor 21 is closer to the 3 rd opening 63 than the 4 th opening 64 of the planar antenna 3, and the 2 nd coil conductor end 24 of the coil conductor 21 is closer to the 4 th opening 64 than the 3 rd opening 63 of the planar antenna 3. Thereby, the feeding coil 2 can be disposed near the center of the planar antenna 3. As a result, the degree of freedom of the arrangement of the feeding coil 2 with respect to the planar antenna 3 can be improved.
In the antenna device 1 according to embodiment 1, the 1 st coil conductor end 23 of the coil conductor 21 in the feeding coil 2 does not overlap the 1 st opening 53 of the planar antenna 3, and the 2 nd coil conductor end 24 of the coil conductor 21 does not overlap the 2 nd opening 54 of the planar antenna 3. Likewise, the 1 st coil conductor end 23 of the coil conductor 21 does not overlap the 3 rd opening 63 of the planar antenna 3, and the 2 nd coil conductor end 24 of the coil conductor 21 does not overlap the 4 th opening 64 of the planar antenna 3. Thus, even if the positional relationship between the planar antenna 3 and the feeding coil 2 is slightly shifted, the variation in the degree of coupling between the planar antenna 3 and the feeding coil 2 can be reduced. As a result, the characteristics of the antenna device 1 can be stabilized.
In the antenna device 1 according to embodiment 1, the 3 rd winding portion 61 is provided so that the 3 rd opening 63 overlaps the 1 st opening 53. The 4 th wrap 62 is provided such that the 4 th opening 64 overlaps the 2 nd opening 54. Thereby, the 1 st wound portion 51 overlaps with the 3 rd wound portion 61, and the 2 nd wound portion 52 overlaps with the 4 th wound portion 62. As a result, the capacitance components are easily secured between the 1 st winding portion 51 and the 3 rd winding portion 61 and between the 2 nd winding portion 52 and the 4 th winding portion 62, and therefore the antenna device 1 can be downsized.
In the antenna device 1 according to embodiment 1, the planar conductor portion 55 is located at the innermost periphery of the 1 st winding portion 51, and the planar conductor portion 56 is located at the innermost periphery of the 2 nd winding portion 52. Thus, in the planar antenna 3, the 8-shaped structure in which the 1 st winding portion 51 and the 2 nd winding portion 52 are opposite in phase to each other can be easily configured. Likewise, the planar conductor portion 65 is located at the innermost periphery of the 3 rd wound portion 61, and the planar conductor portion 66 is located at the innermost periphery of the 4 th wound portion 62. Thus, in the planar antenna 3, the 8-shaped structure in which the 3 rd winding portion 61 and the 4 th winding portion 62 are opposite in phase to each other can be easily configured.
(modification of embodiment 1)
A modification of embodiment 1 will be described below.
As modifications 1 and 2 of embodiment 1, the antenna device 1 may be configured such that the position of the intermediate portion 57 is changed from the intermediate portion 57 of embodiment 1, as shown in fig. 5A and 5B. Similarly, the antenna device 1 may change the position of the intermediate portion 67 with respect to the intermediate portion 67 in embodiment 1. This can further improve the degree of freedom in the arrangement of the power supply coil 2.
As shown in fig. 5A, in modification 1, an intermediate portion 57 is provided so that the 1 st opening 53 of the 1 st winding portion 51 is larger than the 2 nd opening 54 of the 2 nd winding portion 52. Similarly, the intermediate portion 67 is provided such that the 3 rd opening 63 of the 3 rd wound portion 61 is larger than the 4 th opening 64 of the 4 th wound portion 62.
As shown in fig. 5B, in modification 2, an intermediate portion 57 is provided so that the 2 nd opening 54 of the 2 nd winding portion 52 is larger than the 1 st opening 53 of the 1 st winding portion 51. Similarly, the intermediate portion 67 is provided such that the 4 th opening 64 of the 4 th wound portion 62 is larger than the 3 rd opening 63 of the 3 rd wound portion 61.
As modification 3 of embodiment 1, as shown in fig. 5C, the 1 st wound portion 51 and the 2 nd wound portion 52 may have different widths in a direction orthogonal to both the direction in which the 1 st wound portion 51 and the 2 nd wound portion 52 are aligned and the winding axis direction. Similarly, the 3 rd wound portion 61 and the 4 th wound portion 62 may have different widths.
In modification 3, the 1 st opening 53 of the 1 st wound portion 51 is shorter than the 2 nd opening 54 of the 2 nd wound portion 52 in the direction orthogonal to the direction in which the 1 st wound portion 51 and the 2 nd wound portion 52 are aligned. Similarly, the 3 rd opening 63 of the 3 rd winding portion 61 is shorter than the 4 th opening 64 of the 4 th winding portion 62.
As another modification of embodiment 1, the planar conductor portions 55 and 56 are not limited to being positioned on the innermost peripheries of both the 1 st winding portion 51 and the 2 nd winding portion 52. As a modification of embodiment 1, the planar conductor portion 55 may be located only on the innermost periphery of the 1 st winding portion 51, and the planar conductor portion 56 may be located only on the innermost periphery of the 2 nd winding portion 52. In short, the planar conductor portions 55 and 56 may be located on the innermost periphery of at least one of the 1 st winding portion 51 and the 2 nd winding portion 52. As a result, in the antenna device 1 according to the modification as well, the 8-shaped structure in which the 1 st winding portion 51 and the 2 nd winding portion 52 are mutually inverted can be easily configured in the planar antenna 3, as in the antenna device 1 according to embodiment 1.
As a further modification of embodiment 1, the 1 st winding portion 51 and the 2 nd winding portion 52 may not include the planar conductor portions 55 and 56. Similarly, the 3 rd winding portion 61 and the 4 th winding portion 62 may not include the planar conductor portions 65 and 66. In this case, the parasitic capacitance generated between the conductors of the planar antenna 3 is a main capacitance component constituting the resonant circuit. In the 1 st winding portion 51 and the 2 nd winding portion 52, only the 1 st winding portion 51 may be provided with the flat conductor portion 55, and only the 2 nd winding portion 52 may be provided with the flat conductor portion 56. Similarly, of the 3 rd winding portion 61 and the 4 th winding portion 62, only the 3 rd winding portion 61 may be provided with the flat conductor portion 65, and only the 4 th winding portion 62 may be provided with the flat conductor portion 66.
The antenna device 1 according to each of the above-described modifications also exhibits the same effects as the antenna device 1 according to embodiment 1.
(embodiment mode 2)
As shown in fig. 6, the antenna device 1a according to embodiment 2 is different from the antenna device 1 (see fig. 1) according to embodiment 1 in that only the 1 st coil conductor 5 is provided. In the antenna device 1a according to embodiment 2, the same components as those of the antenna device 1 according to embodiment 1 are denoted by the same reference numerals, and description thereof is omitted.
(1) Structure of the product
As shown in fig. 6, the antenna device 1a includes a feeding coil 2 and a planar antenna 3 a. The power supply coil 2 according to embodiment 2 is similar to the power supply coil 2 according to embodiment 1.
The planar antenna 3a includes a base 4 and a1 st coil conductor 5, as in the planar antenna 3 (see fig. 1) of embodiment 1. On the other hand, the planar antenna 3a does not include the 2 nd coil conductor 6 (see fig. 1). The base material 4 of embodiment 2 has the same structure and function as the base material 4 of embodiment 1. The 1 st coil conductor 5 according to embodiment 2 has the same configuration and function as the 1 st coil conductor 5 according to embodiment 1.
Further, the 1 st coil conductor 5 has planar conductor portions 55 and 56, as in embodiment 1. The planar conductor portions 55 and 56 face planar conductors described later in the winding axial direction.
Further, as in embodiment 1, the planar conductor portion 55 is located at the innermost periphery of the 1 st wound portion 51, and the planar conductor portion 56 is located at the innermost periphery of the 2 nd wound portion 52.
However, as in embodiment 1, the planar conductor portions 55 and 56 face the intermediate portion 57 of the 1 st coil conductor 5 in the direction perpendicular to the winding axis direction of the planar antenna 3. The intermediate portion 57 is a coupling portion of the planar antenna 3a that mainly magnetically couples with the feeding coil 2. More specifically, the intermediate portion 57 is a portion of the 1 st winding portion 51 and the 2 nd winding portion 52 of the 1 st coil conductor 5 that is mainly magnetically coupled to the power supply coil 2.
(2) Effect
In the antenna device 1a according to embodiment 2, the planar conductor portions 55 and 56 face the planar conductors outside the antenna device 1 a. This can form a capacitance component between the planar conductor and the planar conductor portions 55 and 56. As a result, when the planar conductor portions 55 and 56 of the planar antenna 3a and the 1 st winding portion 51 and the 2 nd winding portion 52 of the planar antenna 3a form a resonance circuit, it is easy to secure a capacitance component.
In the antenna device 1a according to embodiment 2, the planar conductor portions 55 and 56 are located on the innermost peripheries of both the 1 st winding portion 51 and the 2 nd winding portion 52. This makes it possible to easily form an 8-shaped structure in which the 1 st winding portion 51 and the 2 nd winding portion 52 are opposite in phase to each other in the planar antenna 3 a.
(modification of embodiment 2)
As a modification of embodiment 2, as shown in fig. 7, the 1 st winding portion 51 and the 2 nd winding portion 52 may not include the planar conductor portions 55 and 56. In this case, the parasitic capacitance generated between the conductors of the planar antenna 3 is a main capacitance component constituting the resonant circuit. In the 1 st winding portion 51 and the 2 nd winding portion 52, only the 1 st winding portion 51 may be provided with the flat conductor portion 55, and only the 2 nd winding portion 52 may be provided with the flat conductor portion 56.
As another modification of embodiment 2, the planar conductor portions 55 and 56 are not limited to being positioned on the innermost peripheries of both the 1 st winding portion 51 and the 2 nd winding portion 52. As a modification of embodiment 2, the planar conductor portions 55 and 56 may be located only on the innermost periphery of the 1 st wound portion 51 or only on the innermost periphery of the 2 nd wound portion 52. In short, the planar conductor portions 55 and 56 may be located on the innermost periphery of at least one of the 1 st winding portion 51 and the 2 nd winding portion 52. This makes it possible to easily form an 8-shaped structure in which the 1 st winding portion 51 and the 2 nd winding portion 52 are opposite in phase to each other in the planar antenna 3 a.
The antenna device 1a according to each of the above-described modifications also exhibits the same effects as the antenna device 1a according to embodiment 2.
(embodiment mode 3)
In embodiment 3, as shown in fig. 8A and 8B, an electronic device 7 using the antenna device 1 will be described. In embodiment 3, a case where the electronic device 7 is a mobile phone will be described. The mobile phone includes a smartphone.
(1) Structure of the product
As shown in fig. 8A and 8B, the electronic device 7 according to embodiment 3 includes the antenna device 1, a case 71, and a control circuit 72. The electronic device 7 further includes a battery 73 and a display 74. The antenna device 1 according to embodiment 3 has the same configuration and function as the antenna device 1 according to embodiment 1.
The control circuit 72 includes a power supply circuit that supplies power to the power supply coil 2. In more detail, the power supply circuit is, for example, a circuit including the RFIC element 78 for NFC. The power supply circuit may include at least one of a resonance circuit and a matching circuit (not shown) in addition to the RFIC element 78.
The housing 71 is a metal housing. The housing 71 is provided with the antenna device 1. In more detail, the planar antenna 3 in the antenna device 1 is disposed on the inner surface 713 of the housing 71. Specifically, the planar antenna 3 is attached to the inner surface 713 of the housing 71. On the other hand, the power supply coil 2 is provided on the substrate 76. Specifically, the power supply coil 2 is mounted on the substrate 76. On the substrate 76, a plurality of circuit elements 77 are mounted together with the power supply coil 2.
The housing 71 has a rectangular shape having a long side direction and a short side direction. The case 71 has a1 st case end 711 and a2 nd case end 712, which are ends in the longitudinal direction.
In the electronic device 7 according to embodiment 3, the shortest distance between the 1 st winding part 51 and the 1 st case end 711 is shorter than the shortest distance between the 1 st winding part 51 and the 2 nd case end 712. Further, the shortest distance between the 2 nd winding portion 52 and the 2 nd case end portion 712 is shorter than the shortest distance between the 2 nd winding portion 52 and the 1 st case end portion 711.
Likewise, the shortest distance between the 3 rd wound portion 61 and the 1 st case end portion 711 is shorter than the shortest distance between the 3 rd wound portion 61 and the 2 nd case end portion 712. Further, the shortest distance between the 4 th wound portion 62 and the 2 nd case end portion 712 is shorter than the shortest distance between the 4 th wound portion 62 and the 1 st case end portion 711.
However, as shown in fig. 9, when the feeding coil 2 and the planar antenna 3 are provided in the case 71, the length E1 of the coil conductor 21 of the feeding coil 2 in the longitudinal direction of the case 71 is shorter than the length E2 of the intermediate portions 57, 67 of the planar antenna 3 in the longitudinal direction of the case 71. Further, a length E1 of the coil conductor 21 of the power supply coil 2 in the longitudinal direction of the case 71 is a length between the 1 st coil conductor end 23 and the 2 nd coil conductor end 24 in the winding axis direction of the coil conductor 21.
In other words, in the longitudinal direction of the case 71, the shortest distance B11 between the planar conductor portion 55 and the 1 st coil conductor end 23 of the coil conductor 21 is longer than the shortest distance B21 between the planar conductor portion 55 and the intermediate portion 57. Likewise, in the longitudinal direction of the case 71, the shortest distance B11 between the planar conductor portion 65 and the 1 st coil conductor end 23 of the coil conductor 21 is longer than the shortest distance B21 between the planar conductor portion 65 and the intermediate portion 67. Further, in the longitudinal direction of the case 71, the shortest distance B12 between the planar conductor portion 56 and the 2 nd coil conductor end 24 of the coil conductor 21 is longer than the shortest distance B22 between the planar conductor portion 56 and the intermediate portion 57. Similarly, in the longitudinal direction of the case 71, the shortest distance B12 between the planar conductor portion 66 and the 2 nd coil conductor end 24 of the coil conductor 21 is longer than the shortest distance B22 between the planar conductor portion 66 and the intermediate portion 67.
Accordingly, even if the positional relationship between the planar antenna 3 and the feeding coil 2 is slightly shifted, the variation in the degree of coupling between the planar antenna 3 and the feeding coil 2 can be reduced, and thus the characteristics of the antenna device 1 can be stabilized.
(2) Effect
In the antenna device 1 according to embodiment 3, the 1 st coil conductor end 23 of the coil conductor 21 in the feeding coil 2 is closer to the 1 st opening 53 than the 2 nd opening 54 of the planar antenna 3, as in the antenna device 1 according to embodiment 1. Further, the 2 nd coil conductor end 24 of the coil conductor 21 is closer to the 2 nd opening 54 than the 1 st opening 53 of the planar antenna 3. Thus, the feeding coil 2 can be disposed near the center of the planar antenna 3, and thus the degree of freedom in the disposition of the feeding coil 2 with respect to the planar antenna 3 can be increased.
For example, in a cellular phone, a main antenna is disposed at the uppermost portion of the case 71, and a battery 73 having a relatively larger size than other members is disposed at the lower portion. Even when the antenna device 1 is used in such a mobile phone, the power supply coil 2 can be arranged without being limited by the arrangement of the main antenna or the battery 73.
According to the electronic device 7 of embodiment 3, the antenna device 1 can be disposed in the case 71 such that the direction in which the 1 st winding portion 51 and the 2 nd winding portion 52 are aligned is along the longitudinal direction of the case 71. As a result, the user can use the portable terminal more conveniently.
(modification of embodiment 3)
As modification 1 of embodiment 3, as shown in fig. 10A, the intermediate portion 57 may have a larger line width than the other portions of the 1 st wound portion 51. The width of the intermediate portion 57 may be larger than the width of the other portion of the 2 nd winding portion 52. Similarly, the line width of the intermediate portion 67 may be larger than the line width of the other portion of the 3 rd wound portion 61. The width of the intermediate portion 67 may be larger than the width of the other portion of the 4 th winding portion 62.
In modification 1, the length E2 of the intermediate portions 57 and 67 of the planar antenna 3 in the longitudinal direction of the housing 71 can be made longer than that in embodiment 3. Accordingly, even if the positional relationship between the planar antenna 3 and the feeding coil 2 is largely deviated, the variation in the degree of coupling between the planar antenna 3 and the feeding coil 2 can be reduced, and thus the characteristics of the antenna device 1 can be further stabilized.
As modification 2 of embodiment 3, as shown in fig. 10B, the intermediate portion 57 and the intermediate portion 67 may be provided in a staggered configuration.
In modification 2, the length E2 of the intermediate portions 57 and 67 of the planar antenna 3 in the longitudinal direction of the housing 71 can be made longer than that in embodiment 3. Accordingly, even if the positional relationship between the planar antenna 3 and the feeding coil 2 is largely deviated, the variation in the degree of coupling between the planar antenna 3 and the feeding coil 2 can be reduced, and thus the characteristics of the antenna device 1 can be further stabilized.
As modification 3 of embodiment 3, the electronic device 7b may have a structure as shown in fig. 11. The electronic device 7b includes the antenna device 1b and a housing 71 b. As shown in fig. 11 and 12A, the housing 71b has through holes 715 and 716 that penetrate the inner surface 713 and the outer surface 714.
The electronic device 7b includes the antenna device 1b as shown in fig. 11. The antenna device 1b includes a feeding coil 2 and a planar antenna 3 b. As shown in fig. 12B, the power supply coil 2 is provided in the vicinity of the camera in the control circuit 72.
As shown in fig. 12A, the planar antenna 3b is provided around the through holes 715 and 716 in the case 71 b. More specifically, the planar antenna 3b is attached to the inner surface 713 of the housing 71b so as to be positioned around the through holes 715 and 716. Specifically, the 1 st winding portion 51 of the 1 st coil conductor 5 and the 3 rd winding portion 61 of the 2 nd coil conductor 6 are provided around the through hole 715 such that the through hole 715 is positioned at the 1 st opening 53 of the 1 st coil conductor 5 and the 3 rd opening 63 of the 2 nd coil conductor 6. Further, the 2 nd winding portion 52 of the 1 st coil conductor 5 and the 4 th winding portion 62 of the 2 nd coil conductor 6 are positioned around the through hole 716 such that the through hole 716 is positioned at the 2 nd opening 54 of the 1 st coil conductor 5 and the 4 th opening 64 of the 2 nd coil conductor 6.
Thus, the magnetic flux generated in the planar antenna 3b flows to the outside of the housing 71 through the through holes 715 and 716, and communication with the antenna device (not shown) on the other side is enabled.
As another modification of embodiment 3, the electronic device 7 may include the antenna device 1a according to embodiment 2 instead of the antenna device 1. Alternatively, the electronic device 7 may include the antenna device 1 according to the modification of embodiment 1, or may include the antenna device 1a according to the modification of embodiment 2.
The electronic device 7 is not limited to a mobile phone including a smartphone, and may be a wearable device, a wristwatch-type terminal, a headphone, or a hearing aid, for example.
The electronic devices 7 and 7b according to the above-described modifications also exhibit the same effects as the electronic device 7 according to embodiment 3.
The embodiments and modifications described above are merely some of the various embodiments and modifications of the present invention. In addition, as long as the object of the present invention can be achieved, the embodiment and the modification can be variously modified according to design and the like.
(mode)
The following embodiments are disclosed in accordance with the embodiments and modifications described above.
An antenna device (1; 1 a; 1b) according to claim 1 is provided with a feeding coil (2) and a planar antenna (3; 3 a; 3 b). The power supply coil (2) includes a coil conductor (21) having a1 st coil conductor end (23) and a2 nd coil conductor end (24). The planar antenna (3; 3 a; 3b) includes a1 st winding part (51) having a1 st opening (53) and a2 nd winding part (52) having a2 nd opening (54), and is magnetically coupled to the power supply coil (2). When the planar antenna (3; 3 a; 3b) is viewed in plan, the winding part (51) 1 and the winding part (52) 2 of the planar antenna (3; 3 a; 3b) are wound in opposite phases. The 1 st coil conductor end (23) of the coil conductor (21) is closer to the 1 st opening (53) than the 2 nd opening (54) of the planar antenna (3; 3 a; 3b) when the planar antenna (3; 3 a; 3b) is viewed in plan. The 2 nd coil conductor end (24) of the coil conductor (21) is closer to the 2 nd opening (54) than the 1 st opening (53) of the planar antenna (3; 3 a; 3b) when the planar antenna (3; 3 a; 3b) is viewed in plan.
According to the antenna device (1; 1 a; 1b) of the first aspect, the feeding coil (2) can be disposed near the center of the planar antenna (3; 3 a; 3 b). As a result, the degree of freedom of the arrangement of the power supply coil (2) with respect to the planar antenna (3; 3 a; 3b) can be increased.
In the antenna device (1; 1 a; 1b) according to claim 2, in the 1 st aspect, the 1 st coil conductor end (23) of the coil conductor (21) does not overlap the 1 st opening (53) of the planar antenna (3; 3 a; 3b) when the planar antenna (3; 3 a; 3b) is viewed in plan. When the planar antenna (3; 3 a; 3b) is viewed in plan, the 2 nd coil conductor end (24) of the coil conductor (21) does not overlap the 2 nd opening (54) of the planar antenna (3; 3 a; 3 b).
According to the antenna device (1; 1 a; 1b) of the second aspect, even if the positional relationship between the planar antenna (3; 3 a; 3b) and the power supply coil (2) is slightly shifted, the variation in the degree of coupling between the planar antenna (3; 3 a; 3b) and the power supply coil (2) can be reduced. As a result, the characteristics of the antenna device (1; 1 a; 1b) can be stabilized.
In the antenna device (1; 1b) according to claim 3, in the first or second aspect, the planar antenna (3; 3b) further includes a 3 rd winding portion (61) having a 3 rd opening (63) and a 4 th winding portion (62) having a 4 th opening (64). The 3 rd winding part (61) is provided so that the 3 rd opening (63) overlaps the 1 st opening (53) in the winding axis direction. The 4 th winding part (62) is provided so that the 4 th opening (64) overlaps the 2 nd opening (54) in the winding axis direction.
According to the antenna device (1; 1b) of the 3 rd aspect, the 1 st winding part (51) overlaps the 3 rd winding part (61), and the 2 nd winding part (52) overlaps the 4 th winding part (62). As a result, capacitance components are easily secured between the 1 st winding part (51) and the 3 rd winding part (61) and between the 2 nd winding part (52) and the 4 th winding part (62), and therefore, the antenna device (1; 1b) can be miniaturized.
An antenna device (1a) according to claim 4 is the antenna device (1a) according to claim 1 or 2, wherein the planar antenna (3a) includes planar conductor portions (55, 56) facing the planar conductors (housings 71, 71a) in the winding axis direction.
According to the antenna device (1a) of claim 4, a capacitance component can be formed between the planar conductors (housings 71; 71a) and the planar conductor portions (55, 56). As a result, when a resonant circuit is formed by the planar conductor parts (55, 56) of the planar antenna (3a) and the 1 st winding part (51) and the 2 nd winding part (52) of the planar antenna (3a), a capacitance component is easily secured.
In the antenna device (1; 1 a; 1b) according to claim 5, in the 4 th aspect, the planar conductor sections (55, 56) are positioned on the innermost periphery of at least one of the 1 st winding section (51) and the 2 nd winding section (52).
According to the antenna device (1; 1 a; 1b) of the 5 th aspect, the planar antenna (3; 3 a; 3b) can easily have a 8-shaped structure in which the 1 st winding part (51) and the 2 nd winding part (52) are opposite in phase to each other.
In the antenna device (1; 1 a; 1b) according to claim 6, in the 4 th or 5 th aspect, the planar conductor portions (55, 56) face the intermediate portion (57) in a direction orthogonal to the winding axis direction. The intermediate section (57) is a coupling section of the planar antenna (3; 3 a; 3b) that magnetically couples with the power supply coil (2).
An electronic device (7; 7b) according to claim 7 includes any one of the antenna devices (1; 1 a; 1b) according to claims 1 to 6, and a housing (71; 71 b). An antenna device (1; 1 a; 1b) is arranged in the housing (71; 71 b).
According to the electronic device (7; 7b) of claim 7, the antenna device (1; 1 a; 1b) can be provided with the feeding coil (2) near the center of the planar antenna (3; 3 a; 3 b). As a result, the degree of freedom of the arrangement of the power supply coil (2) with respect to the planar antenna (3; 3 a; 3b) can be increased.
In the electronic device (7; 7b) according to claim 8, in claim 7, the housing (71; 71b) has a rectangular shape having a longitudinal direction and a short-side direction. The case (71; 71b) has a1 st case end (711) and a2 nd case end (712) as ends in the longitudinal direction. The shortest distance between the 1 st wound portion (51) and the 1 st case end portion (711) is shorter than the shortest distance between the 1 st wound portion (51) and the 2 nd case end portion (712). The shortest distance between the 2 nd winding portion (52) and the 2 nd case end portion (712) is shorter than the shortest distance between the 2 nd winding portion (52) and the 1 st case end portion (711).
According to the electronic device (7; 7b) of the 8 th aspect, the antenna device (1; 1 a; 1b) can be disposed in the housing (71; 71b) so that the direction in which the 1 st winding portion (51) and the 2 nd winding portion (52) are arranged is along the longitudinal direction of the housing (71; 71 b). As a result, the user can use the portable terminal more conveniently.
In an electronic device (7b) according to claim 9, in the 7 th or 8 th aspect, the case (71b) is a metal case having a through hole (715; 716) that penetrates the inner surface (713) and the outer surface (714). The antenna device (1b) is provided around the through-hole (715; 716) in the housing (71 b).
The electronic device (7; 7b) according to claim 10 further includes a power supply circuit according to claim 8 or 9. The power supply circuit supplies power to the power supply coil (2).
Claims (10)
1. An antenna device is characterized by comprising:
a power supply coil including a coil conductor having a1 st coil conductor end and a2 nd coil conductor end; and
a planar antenna including a1 st winding part having a1 st opening and a2 nd winding part having a2 nd opening, magnetically coupled to the power supply coil,
the winding parts 1 and 2 of the planar antenna are mutually opposite in phase when the planar antenna is viewed from the top,
when the planar antenna is viewed in plan, the 1 st coil conductor end of the coil conductor is closer to the 1 st opening than the 2 nd opening of the planar antenna, and the 2 nd coil conductor end of the coil conductor is closer to the 2 nd opening than the 1 st opening of the planar antenna.
2. The antenna device of claim 1,
when the planar antenna is viewed in plan, the 1 st coil conductor end of the coil conductor does not overlap the 1 st opening of the planar antenna, and the 2 nd coil conductor end of the coil conductor does not overlap the 2 nd opening of the planar antenna.
3. The antenna device according to claim 1 or 2,
the planar antenna further includes a 3 rd winding part having a 3 rd opening and a 4 th winding part having a 4 th opening,
the 3 rd winding part is provided such that the 3 rd opening overlaps with the 1 st opening in the winding axis direction,
the 4 th winding portion is provided such that the 4 th opening overlaps the 2 nd opening in the winding axis direction.
4. The antenna device according to claim 1 or 2,
the planar antenna has a planar conductor portion facing a planar conductor in a winding axis direction.
5. The antenna device according to claim 4,
the planar conductor portion is located on an innermost circumference of at least one of the 1 st winding portion and the 2 nd winding portion.
6. The antenna device according to claim 4,
the planar conductor portion is opposed to an intermediate portion of the planar antenna, which is magnetically coupled to the power supply coil, in a direction orthogonal to a winding axis direction.
7. An electronic device is characterized by comprising:
an antenna device as claimed in any one of claims 1 to 6; and
a housing provided with the antenna device.
8. The electronic device of claim 7,
the case has a rectangular shape having a long side direction and a short side direction, and has a1 st case end and a2 nd case end as ends of the long side direction,
the shortest distance between the 1 st winding part and the 1 st case end part is shorter than the shortest distance between the 1 st winding part and the 2 nd case end part,
the shortest distance between the 2 nd winding part and the 2 nd case end part is shorter than the shortest distance between the 2 nd winding part and the 1 st case end part.
9. The electronic device of claim 7 or 8,
the housing is a metal housing having a through hole penetrating an inner surface and an outer surface,
the antenna device is provided in the housing around the through hole.
10. The electronic device of claim 8,
the electronic device further includes a power supply circuit configured to supply power to the power supply coil.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2018247853A JP2020108102A (en) | 2018-12-28 | 2018-12-28 | Antenna device and electronic equipment |
| JP2018-247853 | 2018-12-28 |
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| Publication Number | Publication Date |
|---|---|
| CN210443652U true CN210443652U (en) | 2020-05-01 |
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| CN201921785310.3U Active CN210443652U (en) | 2018-12-28 | 2019-10-22 | Antenna device and electronic apparatus |
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| CN (1) | CN210443652U (en) |
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| JP7315114B2 (en) * | 2020-12-22 | 2023-07-26 | 株式会社村田製作所 | Cap with RFIC module and syringe with RFID tag |
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| JP4872713B2 (en) * | 2007-02-27 | 2012-02-08 | 大日本印刷株式会社 | Non-contact data carrier device |
| JP2013141164A (en) * | 2012-01-05 | 2013-07-18 | Murata Mfg Co Ltd | Antenna device and communication terminal device |
| JP6217006B2 (en) * | 2013-10-18 | 2017-10-25 | 株式会社マトリックス | Magnetic material loaded antenna |
| CN105006654A (en) * | 2015-07-08 | 2015-10-28 | 深圳市信维通信股份有限公司 | Figure-eight-shaped NFC antenna with metal rear housing |
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