JP6081783B2 - Antenna, antenna structure, and electronic device - Google Patents

Description

  The present invention relates to an antenna used by being incorporated in an electronic device mounted on an automobile, a home appliance, a mobile phone, or the like.

  An antenna used by being incorporated in an electronic device is disclosed in Patent Document 1, for example.

  The antenna of Patent Document 1 is mounted on, for example, a mobile phone and connected to an RFID (Radio Frequency Identification) tag. As shown in FIG. 20, the antenna of Patent Document 1 includes an antenna coil (coil member) and a magnetic core (magnetic body). The coil member is formed to have an opening at the center. The magnetic body penetrates the opening of the coil member. The antenna is fixed to the corner of the battery pack (first conductor).

  As shown in FIG. 21, the antenna communicates with a transmission coil (eg, a transmission coil provided in a reader / writer for an RFID tag) located outside the mobile phone. When the antenna communicates with the transmission coil, magnetic flux flows along the surface of the first conductor (see the solid line with an arrow in FIG. 21). The magnetic flux is collected by the magnetic body of the antenna, flows along the magnetic body, and passes through the opening of the antenna coil. That is, the antenna is configured to be coupled with the magnetic flux flowing on the surface of the first conductor. According to Patent Document 1, by configuring the antenna in this way, it is possible to secure a sufficient communication distance while suppressing the influence of various conductors arranged inside the mobile phone.

JP 2012-147407 A

  However, various electric conductors other than the first electric conductor are mounted on the electronic device on which the antenna is mounted. For example, in many cases, the first conductor is covered with a metal cover (second conductor) (see FIGS. 20 and 21). When the antenna is thus sandwiched between the first conductor and the second conductor, the magnetic flux is blocked by the second conductor and is not collected by the antenna magnetic body (two-dot chain line with an arrow in FIG. 21). reference). That is, the antenna is not coupled with the magnetic flux flowing on the surface of the first conductor. In other words, good antenna coupling cannot be obtained between the antenna and the transmission coil.

  Accordingly, the present invention provides an antenna that is arranged so as to be partially sandwiched between a first conductor and a second conductor, and that can obtain good antenna coupling with a transmission coil. The purpose is to do.

According to the present invention, as the first antenna,
An antenna capable of constituting an antenna structure together with the first conductive surface and the second conductive surface by being partially disposed between a first conductive surface and a second conductive surface respectively disposed at different positions in a predetermined direction. A coil member and a magnetic body,
The coil member includes a first coil portion extending so as to have a front surface and a back surface located on opposite sides, and a second coil portion extending so as to have a back surface continuous with the back surface of the first coil portion. And at least a part of the first coil part extends on the first plane, and at least a part of the second coil part includes the back surface of the first coil part and the second coil part. Extending on a second plane intersecting the first plane so that the back surface of the first side faces diagonally,
The coil member is provided with a coil conductor that winds around a peripheral portion of the coil member so as to extend over both the first coil portion and the second coil portion.
The magnetic body has a first magnetic part, and the first magnetic part is located at least partially on the back side of the first coil part, along the first coil part. An extending antenna is obtained.

Moreover, according to the present invention, the second antenna is a first antenna,
The antenna can constitute the antenna structure by being arranged at a predetermined arrangement position,
When the antenna is arranged at the arrangement position, at least a part of the second coil portion is located between the first conductive surface and the second conductive surface in the predetermined direction, and the first coil portion is An antenna extending away from the second conductive surface is obtained.

According to the present invention, the third antenna is a first or second antenna,
The first magnetic part is surrounded by the coil conductor to obtain an antenna penetrating the second coil part.

According to the present invention, as the fourth antenna, any one of the first to third antennas,
The magnetic body has a second magnetic part, and the second magnetic part is located at least partially on the back side of the second coil part, along the second coil part. An extending antenna is obtained.

According to the present invention, the fifth antenna is any one of the first to fourth antennas,
An antenna in which the first coil portion and the second coil portion are connected at a right angle is obtained.

According to the present invention, the sixth antenna is any one of the first to fourth antennas,
An antenna is obtained in which the first coil portion and the second coil portion are connected so as to form a curved surface.

According to the present invention, the seventh antenna is any one of the first to sixth antennas,
The coil member has a third coil part,
The first coil part is located between the second coil part and the third coil part,
The third coil portion extends continuously from the first coil portion so as to be separated from the second coil portion, and at least a part of the third coil portion intersects the first plane. Extending on three planes,
The antenna in which the coil conductor is wound around the peripheral portion of the coil member so as to extend over all of the first coil portion, the second coil portion, and the third coil portion is obtained.

According to the present invention, the eighth antenna is a seventh antenna,
The third coil portion has a back surface continuous with the back surface of the first coil portion,
The magnetic body has a third magnetic part, and the third magnetic part is located at least partially on the back side of the third coil part, along the third coil part. An extending antenna is obtained.

According to the present invention, the ninth antenna is any one of the first to eighth antennas,
The magnetic body can be an antenna fixed to the coil member.

According to the invention, as the first antenna structure, an antenna including any one of the first to ninth antennas and a first conductive surface and a second conductive surface arranged at different positions in a predetermined direction, respectively. A structure,
The antenna is arranged at a predetermined arrangement position, whereby at least a part of the second coil portion is located between the first conductive surface and the second conductive surface in the predetermined direction, An antenna structure in which one coil portion extends so as to be away from the second conductive surface is obtained.

Moreover, according to the present invention, the second antenna structure is a first antenna structure,
The second conductive surface is partially cut away, whereby a recess is formed in the second conductive surface;
Part of the second coil portion of the antenna is obtained in the predetermined direction between the first conductive surface and the concave portion of the second conductive surface.

Further, according to the present invention, as the third antenna structure, the first or second antenna structure,
As the first conductive surface, an antenna structure including a plurality of conductive surfaces formed separately from each other is obtained.

According to the present invention, the fourth antenna structure is any one of the first to third antenna structures,
As the second conductive surface, an antenna structure including a plurality of conductive surfaces formed separately from each other is obtained.

According to the present invention, as the fifth antenna structure, any one of the first to fourth antenna structures, further comprising a third conductive surface,
The third conductive surface is disposed so as to be spaced from the first conductive surface in a predetermined plane orthogonal to the predetermined direction,
The antenna has an antenna structure in which the first coil portion is arranged so as to pass between the first conductive surface and the third conductive surface in the predetermined plane.

According to the present invention, the sixth antenna structure is any one of the first to fifth antenna structures,
The antenna has an antenna structure fixed to the first conductive surface.

  According to the present invention, an electronic device including any one of the first to sixth antenna structures can be obtained.

  The coil member of the antenna according to the present invention has a first coil portion and a second coil portion that extend so that the back surfaces face each other diagonally on a plane intersecting each other. Further, at least a part of the magnetic body of the antenna extends along the first coil portion so as to be at least partially located on the back side of the first coil portion. In the antenna configured as described above, the second coil portion is located between the first conductive surface and the second conductive surface, which are arranged at different positions in the predetermined direction, and the first coil portion is separated from the second conductive surface. It can be arranged to extend away. By arranging the antenna as described above, good antenna coupling can be obtained.

It is a top view which shows typically the inside and cover of a mobile telephone provided with the antenna structure by the 1st Embodiment of this invention. Here, the cover is removed from the mobile phone. FIG. 2 is an enlarged perspective view showing a part of the antenna structure of FIG. 1 (part surrounded by a broken line A) in a state where a cover is attached to a mobile phone. It is a perspective view which shows the antenna of the antenna structure of FIG. It is a perspective view which shows the antenna of FIG. 3 from the back. FIG. 5 is a cross-sectional view schematically showing the antenna structure of FIG. 2 along the VV line in a state where the third conductor is not provided. Here, the magnetic flux generated when the mobile phone communicates with the transmission coil is indicated by a solid line with an arrow. Further, the outer shape of the virtual planar antenna is indicated by a two-dot chain line. FIG. 3 is a cross-sectional view schematically showing the antenna structure of FIG. 2 along the line VI-VI. Here, the magnetic flux generated when the mobile phone communicates with the transmission coil is indicated by a solid line with an arrow. Moreover, the external shape of the modification of a 3rd conductor is shown with the dashed-two dotted line, and the magnetic flux which arises when a 3rd conductor is deform | transformed is shown with the dashed-two dotted line with an arrow. FIG. 7A is a plan view schematically showing an antenna forming body that forms the antenna of FIG. FIG. 7B is a plan view showing a modification of the antenna forming body of FIG. FIG. 7C is a plan view showing another modification of the antenna forming body of FIG. FIG. 7D is a plan view showing still another modified example of the antenna formation body of FIG. FIG. 8A is a plan view schematically showing the antenna of the antenna structure of FIG. 2 and the second conductive surface of the second conductor. Here, the magnetic flux generated when the mobile phone communicates with the transmission coil is indicated by a solid line and a broken line with arrows. FIG. 8B is a plan view showing the antenna of FIG. 8A and a modified example of the second conductive surface. FIG. 8C is a plan view showing the antenna of FIG. 8A and another modified example of the second conductive surface. FIG. 9A is a plan view schematically showing the antenna of the antenna structure of FIG. 2 and a modified example of the first conductive surface of the first conductor. FIG. 9B is a plan view schematically showing the antenna of the antenna structure of FIG. 2 and still another modification example of the second conductive surface. It is a top view which shows typically the antenna of the antenna structure of FIG. 2, and the unfavorable modification of a 1st conductive surface and a 3rd conductive surface. It is a perspective view which shows the antenna by the 2nd Embodiment of this invention. It is sectional drawing which shows typically the antenna structure provided with the antenna of FIG. 11 along the XII-XII line. Here, the magnetic flux generated when the mobile phone communicates with the transmission coil is indicated by a solid line with an arrow. It is a perspective view which shows the antenna by the 3rd Embodiment of this invention. It is sectional drawing which shows typically the antenna structure provided with the antenna of FIG. 13 along the XIV-XIV line. Here, the magnetic flux generated when the mobile phone communicates with the transmission coil is indicated by a solid line with an arrow. It is a perspective view which shows typically the antenna structure of the comparative example of this invention. It is a perspective view which shows typically the antenna structure of Example 1 of this invention. It is a perspective view which shows typically the antenna structure of Example 2 of this invention. It is a perspective view which shows typically the antenna structure of Example 3 of this invention. It is a graph which shows the antenna coupling coefficient of the antenna of Examples 1-3 of this invention and a comparative example. It is a perspective view which shows the conventional antenna structure. It is sectional drawing which shows the antenna structure of FIG.

  In the following description, terms indicating positions such as “upper” and “lower” do not indicate absolute positions, but merely indicate relative positions in the drawings.

(First embodiment)
As shown in FIG. 1, an electronic device (mobile phone) 80 according to the first embodiment of the present invention includes an antenna 20, a battery pack (first conductor) 100, and a cover (second conductor) 200. And a circuit board (third conductor) 300.

  As can be understood from FIGS. 1, 5, and 6, the antenna 20 according to the present embodiment is provided separately from the telephone antenna (not shown) of the mobile phone 80. The antenna 20 can be used as a communication antenna such as an NFC (Near Field Communication) antenna or a non-contact charging antenna. For example, the antenna 20 is connected to an RFID tag (not shown) and communicates with a transmission coil 90 located outside the mobile phone 80. The transmission coil 90 is provided, for example, in an RFID reader / writer (not shown). The antenna 20 is not limited to the above-described use, and can be used at any operating frequency and power. The antenna 20 is not particularly limited to the mobile phone 80, and is particularly suitable as an antenna of an electronic device including a metal frame such as an automobile, a household appliance, or a smartphone.

  As can be understood from FIGS. 1 and 2, the first conductor 100 according to the present embodiment is a battery pack 100 mounted on a mobile phone 80. The first conductor 100 has an upper surface (first conductive surface) 110 made of a conductive material and a side surface 120 made of a conductive material. According to the present embodiment, the first conductive surface 110 is a plane orthogonal to the predetermined direction (vertical direction), and the side surface 120 is a plane orthogonal to the first conductive surface 110. However, the first conductive surface 110 and the side surface 120 may be formed differently. For example, the first conductive surface 110 may be a gently curved surface. Further, the side surface 120 may be a plane that obliquely intersects the first conductive surface 110.

  The second conductor 200 according to the present embodiment is a metal cover 200 provided on a member constituting the back surface of the mobile phone 80 (see FIG. 1). The second conductor 200 is located above the first conductor 100 in a predetermined direction. The second conductor 200 has an upper surface (second conductive surface) 210 that is a metal surface. According to the present embodiment, second conductive surface 210 is a plane orthogonal to the predetermined direction. However, the second conductive surface 210 may be formed differently. For example, the second conductive surface 210 may be a gently curved surface.

  The third conductor 300 according to the present embodiment is a circuit board 300 provided inside the mobile phone 80. The third conductor 300 is located in the vicinity of the first conductor 100 in a predetermined plane orthogonal to the predetermined direction. The third conductor 300 has an upper surface (third conductive surface) 310 on which a conductive pattern is formed, and a side surface 320 formed of, for example, an outer surface of a conductive component mounted on the circuit board 300. According to the present embodiment, third conductive surface 310 is a plane orthogonal to the predetermined direction, and side surface 320 is a plane orthogonal to third conductive surface 310. However, the third conductive surface 310 and the side surface 320 may be formed differently. For example, the third conductive surface 310 may be a gently curved surface. Further, the side surface 320 may be a plane that obliquely intersects with the third conductive surface 310.

  Each of the first conductor 100, the second conductor 200, and the third conductor 300 can be composed of various parts other than the parts described above as long as it has a conductive surface. For example, the first conductor 100 may be a shield plate for shielding electromagnetic waves.

  As can be understood from FIG. 6, the antenna 20, the first conductive surface 110, the second conductive surface 210, and the third conductive surface 310 constitute an antenna structure 10 that can receive a signal from the transmission coil 90. . In other words, the antenna structure 10 according to the present embodiment includes the antenna 20, the first conductive surface 110, the second conductive surface 210, and the third conductive surface 310. Further, the cellular phone 80 (see FIG. 1) according to the present embodiment includes an antenna structure 10. However, the antenna structure 10 may not include the third conductive surface 310. In other words, the mobile phone 80 may include an antenna structure 10 ′ (see FIG. 5) configured only from the antenna 20, the first conductive surface 110, and the second conductive surface 210.

  As shown in FIGS. 2 to 4, the antenna 20 according to the present embodiment includes a coil member 30 and a magnetic body 60.

  The coil member 30 includes a first coil portion 32 having a rectangular plate shape and a second coil portion 34 having a rectangular plate shape. The first coil portion 32 extends so as to have a front surface 32F and a back surface 32B located on opposite sides. The second coil portion 34 extends so as to have a front surface 34F and a back surface 34B continuous with the front surface 32F and the back surface 32B of the first coil portion 32, respectively. The second coil portion 34 according to the present embodiment extends so as to be orthogonal to the first coil portion 32. In other words, the first coil part 32 and the second coil part 34 are connected at a right angle. However, the first coil part 32 and the second coil part 34 may be connected at an angle other than a right angle. Furthermore, the 1st coil part 32 and the 2nd coil part 34 may be connected so that a curved surface may be formed.

  As understood from FIG. 3, according to the present embodiment, the first coil portion 32 extends on the first plane 70, and the second coil portion 34 has the back surface 32 </ b> B and the back surface 34 </ b> B inclined. It extends on a second plane 72 orthogonal to the first plane 70 so as to face each other. However, the second plane 72 only needs to intersect the first plane 70. For example, when a curved surface is formed at the connection portion between the first coil portion 32 and the second coil portion 34, at least a part of the first coil portion 32 extends on the first plane 70, and the second coil It suffices that at least a part of the portion 34 extends on the second plane 72.

  More specifically, the coil member 30 according to this embodiment includes a substrate 40 made of an insulating material and a coil conductor 50 made of a conductive material. The coil conductor 50 is formed on the surface of the substrate 40. That is, a part of the substrate 40 including the coil conductor 50 is the first coil part 32, and another part of the substrate 40 including the coil conductor 50 is the second coil part 34. The substrate 40 and the coil conductor 50 thus configured can be formed from, for example, an FPC (Flexible Printed Circuits) or FR-4 (Flame Retardant Type 4) substrate.

  As shown in FIG. 3, the substrate 40 has a peripheral portion 42 and an antenna opening 44. A coil conductor 50 is formed in the peripheral portion 42, and no coil conductor 50 is formed in the antenna opening 44. In other words, the coil member 30 is provided with the coil conductor 50 that winds around the peripheral portion 42 of the coil member 30 so as to extend over both the first coil portion 32 and the second coil portion 34. Therefore, the antenna opening 44 is surrounded by the coil conductor 50.

  The coil conductor 50 has a first end 52 and a second end 54. The first end 52 and the second end 54 are connected to, for example, an RFID tag (not shown).

  The magnetic body 60 according to the present embodiment is made of a soft magnetic body. For example, the magnetic body 60 is formed from a magnetic sheet, a ferrite sheet, or a ferrite core.

  As shown in FIGS. 3 and 4, the magnetic body 60 according to the present embodiment has a first magnetic part 62 and a second magnetic part 64. According to the present embodiment, the first magnetic part 62 is fixed to the back surface 32B of the first coil part 32 so as to extend along the first coil part 32, and the second magnetic part 64 is The second coil portion 34 is fixed to the back surface 34 </ b> B so as to extend along the two coil portions 34. More specifically, the magnetic body 60 according to the present embodiment is fixed to the coil member 30 by, for example, a double-sided tape. However, the magnetic body 60 may not be fixed to the coil member 30. For example, the coil member 30 and the magnetic body 60 can be arranged at predetermined positions (see FIG. 1) of the mobile phone 80 by separate members (not shown).

  As shown in FIGS. 2 and 5, the first conductive surface 110 and the second conductive surface 210 are arranged at different positions in the predetermined direction, respectively. The antenna 20 is partially disposed between the first conductive surface 110 and the second conductive surface 210 in a predetermined direction, and thereby the signal from the transmission coil 90 together with the first conductive surface 110 and the second conductive surface 210. Is formed.

  The antenna 20 is arranged at a predetermined arrangement position. When the antenna 20 is in the arrangement position, at least a part of the second coil portion 34 is located between the first conductive surface 110 and the second conductive surface 210 in the predetermined direction, and the first coil portion 32 is the second coil portion 32. It extends away from the conductive surface 210. In other words, the antenna 20 according to the present embodiment constitutes the antenna structure 10 ′ by being arranged at the arrangement position. For example, the antenna 20 is fixed to the first conductive surface 110 and disposed at the arrangement position by attaching the lower surface of the second magnetic part 64 of the antenna 20 to the first conductive surface 110 with an insulator interposed therebetween. Can do.

  As shown in FIG. 5, when the antenna 20 receives a signal from the transmission coil 90 positioned above the antenna structure 10 'in a predetermined direction (vertical direction) (that is, when communicating), the second conductor A magnetic flux MF along the second conductive surface 210 of 200 is generated. The magnetic flux MF bends at the end of the second conductive surface 210 and travels downward along the side surface 120 of the first conductor 100. When the magnetic flux MF bends at the end of the second conductive surface 210, the density of the magnetic flux MF increases, thereby increasing the magnetic field strength (see the portion surrounded by the broken line B in FIG. 5).

  According to the present embodiment, the magnetic flux MF bent at the end of the second conductive surface 210 is attracted to the first magnetic part 62 of the magnetic body 60 of the antenna 20. For this reason, the magnetic flux MF whose density has been increased intersects with the antenna 20, thereby improving the antenna coupling between the antenna 20 and the transmission coil 90. A part of the magnetic flux MF intersecting with the antenna 20 extends along the first conductive surface 110 and the second magnetic part 64 and comes out to the side part of the antenna 20. Most of the magnetic flux MF extends along the first magnetic part 62 and exits below the antenna 20.

  As can be understood from FIG. 5, the magnetic flux MF can also be captured by providing a planar antenna in the vicinity of the second conductive surface 210 instead of providing the antenna 20, for example (see the two-dot chain line in FIG. 5). However, when the planar antenna is configured in this manner, the planar antenna needs to have a large size. Further, when the antenna 20 does not include the magnetic body 60, most of the magnetic flux MF goes downward without intersecting the antenna 20. Therefore, it is preferable to configure the antenna 20 as in the present embodiment.

  As understood from the above description, according to the present embodiment, the antenna 20 is disposed at a position where the first conductive surface 110 does not affect the flow of the magnetic flux MF as much as possible (that is, a predetermined arrangement position). Thus, the influence of the first conductive surface 110 can be reduced, and thereby the antenna coupling between the antenna 20 and the transmission coil 90 can be improved. In other words, the antenna coupling can be improved mainly by the appropriately disposed second conductive surface 210 and the first magnetic part 62. Further, not only the magnetic flux MF generated above the antenna 20 (see FIGS. 5 and 8A) but also the magnetic flux MF ″ generated on the side portion of the antenna 20 by the second magnetic portion 64 (FIG. 8A). In this embodiment, the antenna coupling can be improved even when the antenna 20 is covered with a metal cover or a metal case. 5, the antenna 20 according to the present embodiment can also communicate with the transmission coil 90 positioned in a direction orthogonal to the predetermined direction.

  As shown in FIGS. 2 and 6, the antenna structure 10 includes a third conductor in addition to the antenna 20, the first conductive surface 110, and the second conductive surface 210 arranged in the same manner as the antenna structure 10 ′. 300 third conductive surfaces 310 are provided. The third conductive surface 310 is disposed so as to be spaced from the first conductive surface 110 in a predetermined plane orthogonal to the predetermined direction. The antenna 20 is disposed at a predetermined position, whereby the first coil portion 32 passes between the first conductive surface 110 and the third conductive surface 310 on a predetermined plane orthogonal to the predetermined direction.

  As shown in FIG. 6, when the antenna 20 communicates with the transmitting coil 90 positioned above the antenna structure 10 in a predetermined direction (vertical direction), as with the antenna structure 10 ′ (see FIG. 5), A magnetic flux MF along the second conductive surface 210 of the second conductor 200 is generated. Similar to the antenna structure 10 ′, the magnetic flux MF bends at the end of the second conductive surface 210 and is attracted to the first magnetic part 62 of the magnetic body 60 of the antenna 20. In particular, since the antenna structure 10 ′ includes the third conductive surface 310, the magnetic flux MF can be more effectively attracted to the first magnetic part 62. Therefore, the antenna coupling between the antenna 20 and the transmission coil 90 can be further improved as compared with the antenna structure 10 ′.

  As understood from FIG. 6, the antenna 20 may be completely covered by the second conductive surface 210 from above (see the two-dot chain line in FIG. 6). In other words, the second conductive surface 210 may be located over the entire area between the antenna 20 and the transmission coil 90 in a predetermined direction. Even in this case, the magnetic flux MF is attracted to the first magnetic portion 62 by bending the end portion of the second conductive surface 210. Furthermore, since the antenna structure 10 includes the third conductive surface 310, even in this case, the magnetic flux MF bent at the end can be captured more reliably.

  As can be understood from FIGS. 5 and 6, in order to improve the antenna coupling, it is preferable that the second coil portion 34 of the antenna 20 is located in the vicinity of the first conductive surface 110. More preferably, it is close to the surface 110. More specifically, it is preferable that the back surface of the second magnetic part 64 is in close contact with the first conductive surface 110 with an insulator interposed therebetween. In order to improve the antenna coupling, the second coil portion 34 of the antenna 20 is preferably located in the vicinity of the second conductive surface 210, and further closer to the second conductive surface 210. preferable. More specifically, the front surface 32F of the second coil portion 34 is preferably in close contact with the second conductor 200 with an insulator interposed therebetween.

  On the other hand, the first coil portion 32 of the antenna 20 may be separated from either the first conductor 100 or the second conductor 200. Further, the first coil portion 32 may extend downward so as to gradually move away from the first conductor 100.

  When the back surface of the second magnetic unit 64 is in close contact with the first conductive surface 110 and the front surface 32F of the second coil unit 34 is in close contact with the second conductor 200, the first conductive surface 110 and the second conductive surface 210 are used. Is closest in a predetermined direction. At this time, the magnetic flux MF passing through the second coil portion 34 of the antenna 20 decreases, and the magnetic flux MF passing through the first coil portion 32 increases. Since the antenna 20 according to the present embodiment is configured to capture the magnetic flux MF with the first coil portion 32, the antenna coupling is improved.

  As understood from FIG. 7A, the antenna 20 (see FIG. 3) can be manufactured by bending the antenna forming body 22. The antenna forming body 22 according to the present embodiment includes a rectangular substrate 40 and a coil conductor 50 formed on the substrate 40. The antenna forming body 22 has a front surface 22F and a back surface 22B. A magnetic body 60 is affixed to the back surface 22B. The antenna 20 (see FIG. 3) can be manufactured by bending the antenna formation body 22 configured in this way along the fold line BL1 with the back surface 22B facing each other.

  As can be understood from FIG. 7B, the substrate 40 may have a rectangular frame shape in which a central portion is not cut out instead of a rectangular shape. Furthermore, the antenna formation body 22 may not be provided with the board | substrate 40, and may be formed only from the coil conductor 50 formed of the winding. Also in such a case, the antenna 20 (see FIG. 3) can be manufactured by bending the antenna forming body 22 having the magnetic body 60 attached to the back surface 22B along the broken line BL1. When the antenna 20 is manufactured in this manner, the antenna opening 44 (see FIG. 3) is a hole that penetrates the antenna 20.

  As shown in FIG. 7C, the magnetic body 60 may be provided so as to protrude outside the coil conductor 50. As shown in FIG. The inner side of the coil conductor 50 may partially extend. Further, the magnetic body 60 may be located only inside the coil conductor 50 as long as it is located at least partially on the back surface 22B side of the antenna forming body 22. However, in order to improve the antenna coupling between the antenna 20 and the transmission coil 90 (see FIG. 5), it is preferable that at least a part of the magnetic body 60 is located on the back surface 22B side of the coil conductor 50. Further, the entire magnetic body 60 is preferably located on the back surface 22B side of the antenna forming body 22.

  As can be understood from the above description, the antenna 20 according to the present embodiment can be manufactured simply by attaching the magnetic body 60 to the back surface 22B of the antenna forming body 22 and bending it. That is, the antenna 20 according to the present embodiment can be easily manufactured.

  As shown in FIG. 8A, the second conductive surface 210 according to the present embodiment has a rectangular shape without a notch. However, as shown in FIGS. 8B and 8C, the second conductive surface 210 may be partially cut away. In other words, the recess 212 may be formed in the second conductive surface 210. When the concave portion 212 is formed, a part of the second coil portion 34 of the antenna 20 at a predetermined position is located between the first conductive surface 110 and the concave portion 212 of the second conductive surface 210 in a predetermined direction. (See FIG. 5).

  When the recessed part 212 is formed in the 2nd conductive surface 210, the area of the 2nd conductive surface 210 located between the antenna opening part 44 and the transmission coil 90 (refer FIG. 5) can be made small. For this reason, a part of the magnetic flux MF (see FIG. 5) flows into the antenna opening 44 of the second coil portion 34, thereby improving the antenna coupling between the antenna 20 and the transmission coil 90. However, it is preferable that at least a part of the second conductive surface 210 is located between the coil conductor 50 and the transmission coil 90 (see FIG. 5) in a predetermined direction.

  As shown in FIG. 9A, the first conductive surface 110 may be composed of conductive surfaces 132 of a plurality of conductive components 130 formed separately from each other. For example, the first conductive surface 110 may be composed of an assembly including a conductive pattern of a circuit board and metal parts, and an upper surface of a battery pack (battery). In this case, the antenna 20 may be disposed so as to straddle the plurality of conductive surfaces 132.

  Similarly, as shown in FIG. 9B, the second conductive surface 210 may be composed of conductive surfaces 232 of a plurality of conductive components 230 formed separately from each other. For example, the second conductive surface 210 may be an assembly of metal plates in one case cover formed by bonding a plurality of metal plates.

  Referring to FIG. 6, the first conductor 100 (ie, the first conductive surface 110), the second conductor 200 (ie, the second conductive surface 210), and the third conductor 300 (ie, the third conductive surface 310). May be electrically connected. For example, the first conductive surface 110, the second conductive surface 210, and the third conductive surface 310 may be grounded in common.

  However, as shown in FIG. 10, for example, when the first conductive surface 110 and the third conductive surface 310 are connected at two or more locations, a short-circuit loop (see the solid line arrow in FIG. 10) is formed. There is a possibility. When the opening 314 of the short-circuit loop and the antenna opening 44 overlap with each other, the magnetic flux MF (see FIG. 6) cancels out, which may significantly reduce the antenna coupling between the antenna 20 and the transmission coil 90. Therefore, it is necessary to prevent the opening 314 and the antenna opening 44 from overlapping each other.

(Second Embodiment)
As understood from FIGS. 11 and 12, the antenna structure 10X according to the second embodiment of the present invention is similar to the antenna structures 10 and 10 ′ according to the first embodiment. 1). The antenna structure 10X includes an antenna 20X that is slightly different from the first embodiment, and a first conductor 100, a second conductor 200, and a third conductor 300 that are configured similarly to the first embodiment. I have.

  As shown in FIG. 11, the antenna 20X according to the present embodiment includes a coil member 30X and a magnetic body 60X.

  The coil member 30X includes a third coil portion 36 in addition to the first coil portion 32 and the second coil portion 34 that are configured in the same manner as in the first embodiment. The first coil part 32 is located between the second coil part 34 and the third coil part 36. The third coil portion 36 extends continuously from the first coil portion 32 so as to be separated from the second coil portion 34. Specifically, the third coil portion 36 extends so as to have a front surface 36F and a back surface 36B that are continuous with the front surface 32F and the back surface 32B of the first coil portion 32, respectively. In other words, the third coil portion 36 has a front surface 36F and a back surface 36B that are continuous with the front surface 32F and the back surface 32B of the first coil portion 32, respectively.

  The third coil portion 36 according to the present embodiment extends so as to be orthogonal to the first coil portion 32. However, the first coil portion 32 and the third coil portion 36 may be connected at an angle other than a right angle. Furthermore, the third coil portion 36 may be connected so that a curved surface is formed.

  As can be understood from FIG. 11, the third coil portion 36 extends on a third plane 74 orthogonal to the first plane 70 so that the front surface 32F and the front surface 36F face each other obliquely. However, the third plane 74 only needs to intersect the first plane 70. Further, for example, when a curved surface is formed at a connection portion between the first coil portion 32 and the third coil portion 36, at least a part of the third coil portion 36 only needs to extend on the third plane 74.

  More specifically, the coil member 30X according to the present embodiment includes a substrate 40X made of an insulating material and having a shape different from that of the substrate 40 according to the first embodiment, and a coil conductor similar to the first embodiment. 50. More specifically, the substrate 40X is cut away leaving the peripheral portion 42, whereby an antenna opening 44X that is a through hole is formed. The first coil part 32, the second coil part 34, and the third coil part 36 are configured from a part of the substrate 40 including the coil conductor 50.

  The coil conductor 50 according to the present embodiment is wound around the peripheral portion 42 of the coil member 30X so as to extend over all of the first coil portion 32, the second coil portion 34, and the third coil portion 36. Therefore, the antenna opening 44 </ b> X is surrounded by the coil conductor 50.

  As understood from the above description, the front surfaces 32F, 34F, and 36F according to the present embodiment are virtual planes including the surface of the coil conductor 50. Similarly, the back surfaces 32B, 34B, and 36B according to the present embodiment are virtual planes including the back surface of the peripheral portion 42 of the substrate 40X.

  The magnetic body 60X according to the present embodiment has only the first magnetic part 62. The first magnetic unit 62 according to the present embodiment is fixed to the back surface of the coil conductor 50 of the first coil unit 32 (that is, the back surface 32B of the first coil unit 32), and extends along the first coil unit 32. ing. However, the first magnetic part 62 may be partially fitted in the antenna opening 44X. Further, the first magnetic part 62 may be provided so as to obliquely penetrate the antenna opening 44X. In other words, the first magnetic part 62 only needs to extend along the first coil part 32 so as to be located at least partially on the back surface 32B side of the first coil part 32.

  The antenna 20X according to the present embodiment is arranged at the arrangement position similarly to the antennas 20 and 20 'according to the first embodiment.

  As shown in FIG. 12, according to the present embodiment, when the antenna 20X communicates with the transmission coil 90 of the reader / writer (not shown), as in the first embodiment (see FIG. 6). Can be attracted to the first magnetic part 62 of the magnetic body 60X. For this reason, the antenna coupling between the antenna 20X and the transmission coil 90 is improved. Further, according to the present embodiment, the magnetic flux MF ′ that has not been attracted to the first magnetic part 62 passes through the antenna opening 44 of the third coil part 36 and escapes below the antenna 20X. For this reason, antenna coupling is further improved.

  As understood from FIG. 12, the magnetic body 60 </ b> X may include a second magnetic part 64 and a third magnetic part 66. In this case, the second magnetic part 64 only needs to extend along the second coil part 34 so as to be located at least partially on the back surface 34B side of the second coil part 34. Similarly, the third magnetic part 66 only needs to extend along the third coil part 36 so as to be at least partially positioned on the back surface 36 </ b> B side of the third coil part 36. By providing the second magnetic part 64 and the third magnetic part 66, the antenna coupling between the antenna 20X and the transmission coil 90 is further improved.

  As shown in FIG. 11 (see the two-dot chain line), the first magnetic part 62 may protrude from the second coil part 34. More specifically, the first magnetic part 62 may penetrate the second coil part 34 so as to be surrounded by the coil conductor 50.

  According to the present embodiment, even when the entire magnetic body 60X is not located on the back surface of the coil conductor 50 (for example, even when the magnetic body 60X is fitted in the antenna opening 44X). The magnetic flux MF induced in the magnetic body 60X passes through the antenna opening 44X of the antenna 20X. For this reason, even when only a part of the magnetic body 60 </ b> X is located on the back surface 32 </ b> B of the first coil portion 32, a relatively large antenna coupling can be obtained.

(Third embodiment)
As can be understood from FIGS. 13 and 14, the antenna structure 10Y according to the third embodiment of the present invention is applied to the mobile phone 80 (see FIG. 1), as in the first and second embodiments. Can be provided. The antenna structure 10Y includes an antenna 20Y that is slightly different from the first and second embodiments, and a first conductor 100 and a second conductor 200 that are configured similarly to the first embodiment. .

  As shown in FIG. 13, the antenna 20Y according to the present embodiment includes a coil member 30Y and a magnetic body 60Y.

  The coil member 30X includes a first coil portion 32 and a second coil portion 34 that are configured in the same manner as in the second embodiment.

  More specifically, the coil member 30X according to the present embodiment includes a substrate 40X configured in the same manner as in the second embodiment, and a coil conductor 50 similar to that in the first embodiment. .

  The magnetic body 60Y according to the present embodiment has only the first magnetic part 62. The first magnetic part 62 according to the present embodiment is fixed to the back surface 32 </ b> B of the first coil part 32 and extends along the first coil part 32. The first magnetic part 62 is located below the upper end of the second coil part 34. However, the 1st magnetic part 62 may protrude from the 2nd coil part 34 (refer the dashed-two dotted line of FIG. 13).

  The antenna 20Y according to the present embodiment is arranged at the arrangement position in the same manner as the antennas 20 and 20 'according to the first embodiment.

  As shown in FIG. 14, according to the present embodiment, when the antenna 20Y communicates with the transmission coil 90 of the reader / writer (not shown) as in the first embodiment (see FIG. 5). Can be attracted to the first magnetic part 62 of the magnetic body 60Y. For this reason, the antenna coupling between the antenna 20Y and the transmission coil 90 is improved.

  The first magnetic part 62 according to the present embodiment is located entirely on the back surface 32 </ b> B of the first coil part 32. However, the first magnetic part 62 may be fitted and fixed to the antenna opening 44X (see FIG. 13) of the first coil part 32 (see the two-dot chain line in FIG. 14). With this configuration, the thickness of the antenna 20Y becomes equal to the thickness of the magnetic body 60Y. Therefore, the antenna 20Y can be made thinner than when the magnetic body 60Y is fixed to the back surface of the coil member 30Y. However, when the first magnetic part 62 is fitted into the antenna opening 44X, a magnetic flux MF ′ passing downward along the front surface 32F of the first coil part 32 is generated. For this reason, compared with the case where the magnetic body 60Y is fixed to the back surface of the coil member 30Y, antenna coupling falls. When it is important to improve antenna coupling, it is better to fix the magnetic body 60Y to the back surface of the coil member 30Y.

  The embodiment described above can be variously modified. For example, the antenna may be formed integrally with the first conductor. For example, an antenna may be attached to the corner of the first conductor that is a battery pack to form a battery unit. Moreover, the antenna may be arrange | positioned at the center part of the housing | casing of an electronic device, and may be arrange | positioned at the edge part.

  Hereinafter, the antenna and antenna structure according to the present invention will be described in more detail with specific examples.

(Production of antenna of comparative example)
As shown in FIG. 15, a conventional antenna (see FIGS. 20 and 21) was manufactured as an antenna of the comparative example. The coil member was manufactured using FPC having a rectangular frame shape. Specifically, a coil conductor was formed by a copper foil pattern having a width of 0.3 mm on the periphery of an FPC having a size of 25 mm × 5 mm. The coil conductor has a pattern spacing of 0.2 mm, and the FPC peripheral part is wound three turns, thereby forming an antenna opening having a size of 22.4 mm × 2.4 mm in the FPC. It was. The magnetic body was produced using a magnetic sheet having a surface of 20 mm × 12 mm and a thickness of 0.2 mm. The magnetic body was bent along a fold line parallel to the side of 20 mm. Specifically, the fold line extends parallel to the 20 mm side so as to be 5 mm away from one of the 20 mm sides. Therefore, the magnetic body after bending had a total of two surfaces of a 20 mm × 5 mm surface and a 20 mm × 7 mm surface. A 20 mm × 5 mm surface of the magnetic material was configured to penetrate the antenna opening of the coil member, thereby producing a comparative antenna.

(Production of antenna structure of comparative example)
As shown in FIG. 15, a conventional antenna structure (that is, an antenna structure of a comparative example) was produced using the produced antenna of the comparative example. An aluminum case having a size of 100 mm × 50 mm × 7 mm was used as the first conductor. As the second conductor, an aluminum plate having a surface of 100 mm × 50 mm and a thickness of 0.2 mm was used. The antenna of the comparative example was affixed to the first conductor such that the 20 mm × 7 mm surface of the magnetic material was located at the center of the 50 mm × 7 mm surface of the first conductor. The 2nd conductor was arrange | positioned so that the space | interval between 1st conductors might be set to 1 mm. At this time, the 100 mm × 50 mm surface of the second conductor was disposed so as to face the 100 mm × 50 mm surface of the first conductor across the 25 mm × 5 mm surface of the antenna.

(Production of antenna of Example 1)
As shown in FIG. 16, the antenna of Example 1 was manufactured. The coil member was manufactured using FPC having a rectangular frame shape. Specifically, a coil conductor was formed by a copper foil pattern having a width of 0.3 mm on the periphery of an FPC having a size of 25 mm × 12 mm. The coil conductor has a pattern interval of 0.2 mm, and the periphery of the FPC is wound three turns, thereby forming an antenna opening having a size of 22.4 mm × 9.4 mm in the FPC. It was. The magnetic body was produced using a magnetic sheet having a surface of 20 mm × 12 mm and a thickness of 0.2 mm. The coil member and the magnetic body were bonded with a double-sided tape having a thickness of 10 μm, thereby producing an antenna formed body. At this time, the side of 20 mm of the magnetic body was located in the middle part of 25 mm of the coil member. The antenna formed body was bent together with the magnetic body along a fold line parallel to the side of 25 mm, thereby producing the antenna of Example 1. Specifically, the fold line extends parallel to the 25 mm side so as to be 5 mm away from one of the 25 mm sides. Therefore, the produced antenna of Example 1 had a total of two surfaces of 25 mm × 5 mm and 25 mm × 7 mm.

(Production of antenna structure of Example 1)
As shown in FIG. 16, the antenna structure of Example 1 was manufactured using the manufactured antenna of Example 1. An aluminum case having a size of 100 mm × 50 mm × 7 mm was used as the first conductor. As the second conductor, an aluminum plate having a surface of 100 mm × 50 mm and a thickness of 0.2 mm was used. In the antenna of Example 1, the first conductive layer is formed so that the 25 mm × 7 mm surface of the antenna is located at the center of the 50 mm × 7 mm surface of the first conductor and the magnetic body of the antenna faces the first conductor. Pasted on the body. At this time, the antenna was attached such that the coil conductor of the antenna did not protrude from the 100 mm × 50 mm surface of the first conductor. The 2nd conductor was arrange | positioned so that the space | interval between 1st conductors might be set to 1 mm. At this time, the 100 mm × 50 mm surface of the second conductor was disposed so as to face the 100 mm × 50 mm surface of the first conductor across the 25 mm × 5 mm surface of the antenna.

(Production of antenna of Example 2)
As shown in FIG. 17, the antenna of Example 2 was produced in the same manner as the antenna of Example 1.

(Production of antenna structure of Example 2)
As shown in FIG. 17, the antenna structure of Example 2 was manufactured using the manufactured antenna of Example 2. As in Example 1, an aluminum case having a size of 100 mm × 50 mm × 7 mm was used as the first conductor. In addition, an aluminum plate having a surface of 100 mm × 50 mm and a thickness of 0.2 mm was used as the second conductor. Furthermore, an aluminum case having a size of 10 mm × 50 mm × 7 mm was used as the third conductor. The antenna of Example 2 was attached to the first conductor in the same manner as the antenna of Example 1. The second conductor was disposed in the same manner as the second conductor of Example 1. The 3rd conductor was arrange | positioned so that the space | interval between 1st conductors might be set to 1 mm. At this time, the 50 mm × 7 mm surface of the third conductor was disposed so as to face the 50 mm × 7 mm surface of the first conductor across the 25 mm × 7 mm surface of the antenna.

(Production of antenna of Example 3)
As shown in FIG. 18, the antenna of Example 3 was produced. The coil member was manufactured using FPC having a rectangular frame shape. Specifically, a coil conductor was formed by a copper foil pattern having a width of 0.3 mm on the periphery of an FPC having a size of 25 mm × 15 mm. The coil conductor has a pattern spacing of 0.2 mm, and the FPC peripheral portion is wound three turns, thereby forming an antenna opening having a size of 22.4 mm × 12.4 mm in the FPC. It was. The coil member was bent along two fold lines parallel to the side of 25 mm. Specifically, the fold line extended parallel to the 25 mm side so as to be 5 mm and 12 mm away from one of the 25 mm sides. Therefore, the coil member after bending had a total of three surfaces: a 25 mm × 5 mm surface, a 25 mm × 7 mm surface, and a 25 mm × 3 mm surface. The magnetic body was produced using a magnetic sheet having a surface of 20 mm × 7 mm and a thickness of 0.2 mm. A magnetic body was fitted into a 25 mm × 7 mm surface (that is, an antenna opening) of the coil member (see FIG. 13), thereby producing the antenna of Example 3.

(Production of antenna structure of Example 3)
As shown in FIG. 18, the antenna structure of Example 3 was manufactured using the manufactured antenna of Example 3. As in Example 2, an aluminum case having a size of 100 mm × 50 mm × 7 mm was used as the first conductor. In addition, an aluminum plate having a surface of 100 mm × 50 mm and a thickness of 0.2 mm was used as the second conductor. In addition, an aluminum case having a size of 10 mm × 50 mm × 7 mm was used as the third conductor. The antenna of Example 3 was attached to the first conductor in the same manner as the antenna of Example 1. The second conductor and the third conductor were arranged in the same manner as the second conductor and the third conductor of Example 2.

  A transmitter coil having a diameter of 70 mm was prepared using an FR-4 substrate. On the FR-4 substrate, a coil conductor was formed by a copper foil pattern having a width of 0.7 mm and a thickness of 35 μm. The coil conductor had a pattern interval of 0.3 mm and was wound around the periphery of the FR-4 substrate by two turns.

  About each antenna structure of a comparative example and Examples 1-3, the coupling coefficient between a transmission coil and an antenna was measured. More specifically, the coupling coefficient was measured when the transmission coil was arranged to face the second conductor and the distance between the transmission coil and the antenna was changed.

  As shown in FIG. 19, the coupling coefficient of the antenna structure of the comparative example was significantly lowered due to the influence of the second conductor. For example, the coupling coefficient of the antenna structure of the comparative example when the distance between the antennas is 30 mm was 0.001. On the other hand, the antenna structure of Example 1 has a large coupling coefficient even when the second conductor is provided. For example, the coupling coefficient of the antenna structure of Example 1 when the distance between the antennas was 30 mm was 0.013. In addition, the antenna structures of Example 2 and Example 3 had a coupling coefficient larger than that of the antenna structure of Example 1.

10, 10 ', 10X, 10Y Antenna structure 20, 20X, 20Y Antenna 22 Antenna formation body 22F Front surface 22B Rear surface 30, 30X, 30Y Coil member 32 First coil portion 32F Front surface 32B Rear surface 34 Second coil portion 34F Front surface 34B Rear surface 36 Third coil portion 36F Front surface 36B Rear surface 40, 40X Substrate 42 Peripheral portion 44, 44X Antenna opening portion 50 Coil conductor 52 First end portion 54 Second end portion 60, 60X, 60Y Magnetic body 62 First magnetic portion 64 Second Magnetic part 66 Third magnetic part 70 First plane 72 Second plane 74 Third plane 100 Battery pack (first conductor)
110 Upper surface (first conductive surface)
120 Side surface 130 Conductive component 132 Conductive surface 200 Cover (second conductor)
210 Upper surface (second conductive surface)
212 Concave portion 230 Conductive component 232 Conductive surface 300 Circuit board (third conductor)
310 Upper surface (third conductive surface)
314 Opening 320 Side 80 Electronic device (mobile phone)
90 Transmitting coil

Claims (15)

An antenna capable of constituting an antenna structure together with the first conductive surface and the second conductive surface by being partially disposed between a first conductive surface and a second conductive surface respectively disposed at different positions in a predetermined direction. A coil member and a magnetic body,
The coil member includes a first coil portion extending so as to have a front surface and a back surface located on opposite sides, and a second coil portion extending so as to have a back surface continuous with the back surface of the first coil portion. And at least a part of the first coil part extends on the first plane, and at least a part of the second coil part includes the back surface of the first coil part and the second coil part. Extending on a second plane intersecting the first plane so that the back surface of the first side faces diagonally,
The coil member is provided with a coil conductor that winds around a peripheral portion of the coil member so as to extend over both the first coil portion and the second coil portion.
The magnetic body has a first magnetic part and a second magnetic part, and the first magnetic part is located at least partially on the back side of the first coil part, Extending along the first coil part, and the second magnetic part extends along the second coil part so as to be located at least partially on the back side of the second coil part,
The antenna can constitute the antenna structure by being arranged at a predetermined arrangement position,
When the antenna is arranged at the arrangement position, at least a part of the second coil portion is located between the first conductive surface and the second conductive surface in the predetermined direction, and the first coil portion is An antenna extending away from the second conductive surface. The antenna of claim 1,
The first magnetic part is an antenna penetrating the second coil part so as to be surrounded by the coil conductor. The antenna according to claim 1 or 2 , wherein
The first coil part and the second coil part are antennas connected at a right angle. The antenna according to claim 1 or 2 , wherein
The first coil portion and the second coil portion are antennas connected so that a curved surface is formed. An antenna according to any one of claims 1 to 4 ,
The coil member has a third coil part,
The first coil part is located between the second coil part and the third coil part,
The third coil portion extends continuously from the first coil portion so as to be separated from the second coil portion, and at least a part of the third coil portion intersects the first plane. Extending on three planes,
The antenna in which the coil conductor is wound around the peripheral portion of the coil member so as to extend over all of the first coil portion, the second coil portion, and the third coil portion. An antenna capable of constituting an antenna structure together with the first conductive surface and the second conductive surface by being partially disposed between a first conductive surface and a second conductive surface respectively disposed at different positions in a predetermined direction. A coil member and a magnetic body,
The coil member includes a first coil portion extending so as to have a front surface and a back surface located on opposite sides, and a second coil portion extending so as to have a back surface continuous with the back surface of the first coil portion , A third coil portion , at least a portion of the first coil portion extends on the first plane, and at least a portion of the second coil portion is the back surface of the first coil portion. Extending on a second plane intersecting the first plane so that the back surface of the second coil portion and the back surface of the second coil portion face each other diagonally.
The first coil part is located between the second coil part and the third coil part,
The third coil portion extends continuously from the first coil portion so as to be separated from the second coil portion, and at least a part of the third coil portion intersects the first plane. Extending on three planes,
The coil member is provided with a coil conductor that winds around a peripheral portion of the coil member so as to extend over both the first coil portion and the second coil portion.
The coil conductor is wound around the peripheral part of the coil member so as to extend over all of the first coil part, the second coil part and the third coil part,
The magnetic body has a first magnetic part, and the first magnetic part is located at least partially on the back side of the first coil part, along the first coil part. Extended,
The antenna can constitute the antenna structure by being arranged at a predetermined arrangement position,
When the antenna is arranged at the arrangement position, at least a part of the second coil portion is located between the first conductive surface and the second conductive surface in the predetermined direction, and the first coil portion is An antenna extending away from the second conductive surface. An antenna according to claim 5 or claim 6,
The third coil portion has a back surface continuous with the back surface of the first coil portion,
The magnetic body has a third magnetic part, and the third magnetic part is located at least partially on the back side of the third coil part, along the third coil part. Extending antenna. An antenna according to any one of claims 1 to 7,
The magnetic body is an antenna fixed to the coil member. An antenna structure comprising an antenna and a first conductive surface and a second conductive surface respectively disposed at different positions in a predetermined direction,
The antenna includes a coil member and a magnetic body,
The coil member includes a first coil portion extending so as to have a front surface and a back surface located on opposite sides, and a second coil portion extending so as to have a back surface continuous with the back surface of the first coil portion. And at least a part of the first coil part extends on the first plane, and at least a part of the second coil part includes the back surface of the first coil part and the second coil part. Extending on a second plane intersecting the first plane so that the back surface of the first side faces diagonally,
The coil member is provided with a coil conductor that winds around a peripheral portion of the coil member so as to extend over both the first coil portion and the second coil portion.
The magnetic body has a first magnetic part and a second magnetic part, and the first magnetic part is located at least partially on the back side of the first coil part, Extending along the first coil part, and the second magnetic part extends along the second coil part so as to be located at least partially on the back side of the second coil part,
The antenna is arranged at a predetermined arrangement position, whereby at least a part of the second coil portion is located between the first conductive surface and the second conductive surface in the predetermined direction, An antenna structure in which one coil portion extends away from the second conductive surface. An antenna structure according to claim 9, wherein
The second conductive surface is partially cut away, whereby a recess is formed in the second conductive surface;
A part of the second coil portion of the antenna is an antenna structure located between the first conductive surface and the concave portion of the second conductive surface in the predetermined direction. An antenna structure according to claim 9 or claim 10,
The first conductive surface is an antenna structure including a plurality of conductive surfaces formed separately from each other. An antenna structure according to any one of claims 9 to 11,
The second conductive surface is an antenna structure including a plurality of conductive surfaces formed separately from each other. The antenna structure according to any one of claims 9 to 12, further comprising a third conductive surface,
The third conductive surface is disposed so as to be spaced from the first conductive surface in a predetermined plane orthogonal to the predetermined direction,
The antenna is an antenna structure in which the first coil portion is disposed so as to pass between the first conductive surface and the third conductive surface in the predetermined plane. An antenna structure according to any one of claims 9 to 13,
The antenna is an antenna structure fixed to the first conductive surface.   An electronic device comprising the antenna structure according to any one of claims 9 to 14.

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