WO2015133504A1 - アンテナ装置および電子機器 - Google Patents
アンテナ装置および電子機器 Download PDFInfo
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- WO2015133504A1 WO2015133504A1 PCT/JP2015/056293 JP2015056293W WO2015133504A1 WO 2015133504 A1 WO2015133504 A1 WO 2015133504A1 JP 2015056293 W JP2015056293 W JP 2015056293W WO 2015133504 A1 WO2015133504 A1 WO 2015133504A1
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- coil
- planar conductor
- coil conductors
- conductor
- antenna device
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q1/00—Details of, or arrangements associated with, antennas
- H01Q1/12—Supports; Mounting means
- H01Q1/22—Supports; Mounting means by structural association with other equipment or articles
- H01Q1/24—Supports; Mounting means by structural association with other equipment or articles with receiving set
- H01Q1/241—Supports; Mounting means by structural association with other equipment or articles with receiving set used in mobile communications, e.g. GSM
- H01Q1/242—Supports; Mounting means by structural association with other equipment or articles with receiving set used in mobile communications, e.g. GSM specially adapted for hand-held use
- H01Q1/243—Supports; Mounting means by structural association with other equipment or articles with receiving set used in mobile communications, e.g. GSM specially adapted for hand-held use with built-in antennas
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q21/00—Antenna arrays or systems
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q1/00—Details of, or arrangements associated with, antennas
- H01Q1/12—Supports; Mounting means
- H01Q1/22—Supports; Mounting means by structural association with other equipment or articles
- H01Q1/2208—Supports; Mounting means by structural association with other equipment or articles associated with components used in interrogation type services, i.e. in systems for information exchange between an interrogator/reader and a tag/transponder, e.g. in Radio Frequency Identification [RFID] systems
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q1/00—Details of, or arrangements associated with, antennas
- H01Q1/36—Structural form of radiating elements, e.g. cone, spiral, umbrella; Particular materials used therewith
- H01Q1/38—Structural form of radiating elements, e.g. cone, spiral, umbrella; Particular materials used therewith formed by a conductive layer on an insulating support
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q1/00—Details of, or arrangements associated with, antennas
- H01Q1/48—Earthing means; Earth screens; Counterpoises
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q21/00—Antenna arrays or systems
- H01Q21/28—Combinations of substantially independent non-interacting antenna units or systems
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q7/00—Loop antennas with a substantially uniform current distribution around the loop and having a directional radiation pattern in a plane perpendicular to the plane of the loop
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q7/00—Loop antennas with a substantially uniform current distribution around the loop and having a directional radiation pattern in a plane perpendicular to the plane of the loop
- H01Q7/06—Loop antennas with a substantially uniform current distribution around the loop and having a directional radiation pattern in a plane perpendicular to the plane of the loop with core of ferromagnetic material
Definitions
- the present invention relates to an antenna device used in an RFID system, a short-range wireless communication system, and the like, and an electronic apparatus including the antenna device.
- the antenna used there is generally a planar coil antenna, which is used by being attached on the surface of a resin casing of a mobile phone terminal.
- Patent Document 1 discloses an antenna device in which the windings of the coil units are connected by a conductor so that they are the same.
- the antenna device disclosed in Patent Document 1 has a problem that a plurality of null points (insensitive points) are generated in a region facing the main surface of the mobile phone terminal, which is unusable.
- An object of the present invention is to provide an antenna device capable of obtaining good communication characteristics even in the vicinity of an antenna serving as a communication partner in a wide area of an electronic device such as a mobile phone terminal, and an electronic device including the antenna device. .
- the antenna device of the present invention A plurality of coil conductors having a coil opening and a planar conductor;
- the plurality of coil conductors are respectively disposed at the edge portions of the planar conductor in a state having a winding axis in the normal direction of the planar conductor,
- the plurality of coil conductors are connected so that the magnetic flux generated in each coil conductor is in reverse phase,
- a part of the plurality of coil conductors overlaps with the planar conductor, and a part of the coil opening does not overlap with the planar conductor. It is characterized by that.
- the coil conductor and the planar conductor are mainly magnetically coupled, the planar conductor acts as a radiator (radiating plate), and the coil conductor acts as a feeding coil for the radiator.
- At least two coil conductors among the plurality of coil conductors are arranged in line-symmetric positions with respect to a center line extending in a predetermined direction of the planar conductor in a plan view. As a result, a gain peak (hot spot) occurs on the center line of the planar conductor.
- At least two coil conductors among the plurality of coil conductors are arranged at point-symmetrical positions with respect to the center point of the planar conductor in a plan view.
- interval of the two coil conductors in a point symmetry relationship can be widened, and the area
- the planar conductor has two opposing sides, and is formed with a notch-shaped part that is recessed from each side toward the opposing side, and the coil opening of each coil conductor overlaps the notch-shaped part in plan view. Preferably it is.
- the coil conductor can be disposed outside the planar area of the planar conductor without protruding, and therefore the reduction of the planar conductor or the enlargement of the apparatus can be avoided.
- planar conductor has a main surface and a bent surface connected to the main surface, it is preferable that a notch-shaped portion is formed on the bent surface.
- a notch-shaped portion is formed on the bent surface.
- a magnetic sheet is provided so as to cover at least a part of the notch-shaped part in plan view.
- a notch shape part is shielded magnetically and unnecessary radiation can be controlled. Further, even when another conductor is close to the coil conductor, the influence can be suppressed.
- the electronic device of the present invention An antenna device and a power feeding circuit connected to the antenna device;
- the antenna device is A plurality of coil conductors having a coil opening and a planar conductor;
- the plurality of coil conductors are respectively disposed at the edge portions of the planar conductor in a state having a winding axis in the normal direction of the planar conductor,
- the plurality of coil conductors are connected so that the magnetic flux generated in each coil conductor is in reverse phase, In plan view, a part of the plurality of coil conductors overlaps with the planar conductor, a part of the coil opening does not overlap with the planar conductor,
- the planar conductor also serves as a metal part of the housing.
- the metal part of the casing originally provided in the electronic device can be effectively used as the radiator.
- the metal portion of the housing has a main surface and a bent surface connected to the main surface, and a notch-shaped portion for a device is formed on the bent surface, and at least one of the plurality of coil conductors. It is preferable that the coil opening of the coil conductor overlaps the notch shape portion. This makes it easy to use the cutout shape for the operation button so that a part of the plurality of coil conductors overlaps the metal part of the housing and a part of the coil opening does not overlap the metal part of the housing.
- a coil conductor can be arranged. That is, in order to arrange the coil conductor as described above, it is not necessary to provide a dedicated notch-shaped part in the metal part of the housing, so that a reduction in mechanical strength of the metal part can be suppressed.
- the electronic apparatus of the present invention An antenna device and a power feeding circuit connected to the antenna device;
- the antenna device is A plurality of coil conductors having a coil opening and a planar conductor;
- the plurality of coil conductors are respectively disposed at the edge portions of the planar conductor in a state having a winding axis in the normal direction of the planar conductor,
- the plurality of coil conductors are connected so that the magnetic flux generated in each coil conductor is in reverse phase,
- a part of the plurality of coil conductors overlaps with the planar conductor, a part of the coil opening does not overlap with the planar conductor
- the planar conductor is a part of a conductor formed on a circuit board. It is characterized by that.
- the circuit board conductor originally provided in the electronic device can be effectively used as the radiator.
- the plurality of coil conductors and the planar conductor are mainly magnetically coupled, the planar conductor acts as a radiator (radiating plate), and the plurality of coil conductors serve as a feeding coil for the radiator.
- the planar conductor acts as a radiator (radiating plate)
- the plurality of coil conductors serve as a feeding coil for the radiator.
- communication can be performed in a state where the planar conductor faces the communication partner antenna, and a null point (dead point) is substantially not generated.
- the metal part of the casing originally provided in the electronic device and the conductor of the circuit board also serve as the radiator of the antenna device, so that the electronic device incorporating the antenna device can be configured while being small. .
- FIG. 1A and 1B are perspective views of the antenna device according to the first embodiment, respectively.
- FIG. 2 is a plan view of the feeding coil.
- FIG. 3 is a schematic diagram showing the connection state and current path of the two coil conductors 21 and 22.
- FIG. 4A is a diagram showing the distribution of magnetic flux density around the antenna device of the first embodiment, and shows the distribution of magnetic flux density in the cross section taken along the broken line in FIG.
- FIG. 4B is an enlarged view of the vicinity of the antenna device in FIG.
- FIG. 5A is a plan view of the antenna device according to the second embodiment, and FIG. 5B is a cross-sectional view taken along the alternate long and short dash line in FIG.
- FIG. 6 is a plan view of the antenna device according to the third embodiment.
- FIG. 1A and 1B are perspective views of the antenna device according to the first embodiment, respectively.
- FIG. 2 is a plan view of the feeding coil.
- FIG. 3 is a schematic diagram showing the connection state and current
- FIG. 7 is a plan view of the antenna device according to the fourth embodiment.
- FIG. 8 is a plan view of another antenna device according to the fourth embodiment.
- FIG. 9 is a plan view of another antenna device according to the fourth embodiment.
- FIG. 10 is a plan view of another antenna device according to the fourth embodiment.
- FIG. 11A is a plan view of an antenna device 105A according to the fifth embodiment.
- FIG. 11B is a plan view of an antenna device 105B according to the fifth embodiment.
- FIG. 11C is a plan view of an antenna device 105C according to the fifth embodiment.
- FIG. 11D is a plan view of an antenna device 105D according to the fifth embodiment.
- FIG. 12 is a plan view showing the structure inside the housing of the communication terminal device according to the sixth embodiment.
- FIG. 13 is a perspective view of the lower housing of the electronic device according to the seventh embodiment.
- FIG. 14 is a plan view showing the structure inside the housing of the communication terminal device according to the eighth embodiment.
- the antenna device 101A includes two coil conductors 21 and 22 having a coil opening and a planar conductor 10.
- the planar conductor 10 is, for example, a metal part of a housing of an electronic device.
- the coil conductors 21 and 22 are respectively arranged at the edge portions of the planar conductor 10 in a state having a winding axis in the normal direction of the planar conductor 10.
- the planar conductor 10 has a symmetric center line indicated by a one-dot chain line, and the coil conductors 21 and 22 are arranged at line symmetric positions with respect to the center line of the planar conductor 10.
- the planar conductor here is a conductive member having at least a portion spreading in a planar shape, and may be a surface having not only a planar shape but also a curved shape or a three-dimensional shape.
- FIG. 2 is a plan view of the feeding coil, and FIG.
- the coil conductors 21 and 22 are patterned on one flexible substrate, and the flexible substrate and the coil conductor constitute the feeding coils 41 and 42. In the example shown in FIG. 2, the coil conductors 21 and 22 are formed on one flexible substrate, and the two power supply coils 41 and 42 are configured as one component.
- the coil conductor 21 and the coil conductor 22 are connected in series, and the terminals 31 and 32 are drawn out.
- the two coil conductors 21 and 22 are connected so that the magnetic flux generated in each coil conductor is in reverse phase with respect to the main surface direction of the planar conductor 10.
- a power supply circuit such as an RFIC is connected to the terminals 31 and 32.
- the planar conductor 10 has two opposite sides, and is formed with notched portions CR ⁇ b> 1 and CR ⁇ b> 2 that are recessed from each side toward the opposite side, and the coils of the coil conductors 21 and 22 are formed.
- the openings CA1 and CA2 overlap with the notched portions CR1 and CR2 in plan view.
- the antenna device 101A acts as a transmitting antenna, when current flows in the coil conductors 21 and 22 in the direction indicated by the solid line arrows in FIG. 3, the magnetic fluxes in the directions indicated by the cross symbols and dot symbols in the notched portions CR1 and CR2. Pass through.
- FIG. 4 (A) is a diagram showing the distribution of magnetic flux density around the antenna device of the present embodiment, and shows the distribution of magnetic flux density in the cross section of the broken line in FIG. 1 (A).
- FIG. 4B is an enlarged view of the vicinity of the antenna device in FIG.
- the planar conductor 10 is, for example, a metal part of a housing, and a feeding coil is attached to the metal part. Therefore, as shown in FIG. 4B, the coil conductors 21 and 22 are arranged in close proximity to the planar conductor 10. 4A and 4B also show the circuit board 61 in the housing.
- the communication partner antenna coil 301 and the planar conductor 10 of the antenna device 101A face each other in a parallel state.
- the communication partner antenna coil 301 moves in parallel to the planar conductor 10 of the antenna device 101A, the change in the direction of the magnetic flux entering and exiting the coil opening of the communication partner antenna coil 301 is small. There are few points. As shown in FIG. 4A, when the communication partner antenna coil 301 is located in the center between the two coil conductors 21 and 22 in a plan view, the coil opening of the communication partner antenna coil 301 enters and exits. Since the magnetic flux is subtracted 0, this position becomes the null point. However, since the magnetic field strength between the two coil conductors 21 and 22 is high, the antenna device 101A is coupled to the communication partner antenna coil 301 at a position slightly deviated from the null point. If the parallel relationship of the antenna device 101A with respect to the communication partner antenna coil 301 is shifted (tilted), the antenna device 101A is coupled to the communication partner antenna coil 301.
- the antenna device 101B shown in FIG. 1B is an example in which a coil conductor 25 is further provided in addition to the coil conductors 21 and 22.
- the coil conductor 25 is wound around the opening OP formed in the planar conductor 10.
- the opening OP is connected to the outer edge of the planar conductor 10 through the slit SL.
- the antenna device 101 ⁇ / b> B includes a first antenna including the coil conductors 21 and 22 and the planar conductor 10, and a second antenna including the coil conductor 25 and the planar conductor 10.
- the first antenna and the second antenna are used in different communication systems.
- the planar conductor 10 since at least part of the planar conductor 10 is disposed between the coil conductors of the plurality of antennas, the coil conductors are hardly electromagnetically coupled to each other. Therefore, the plurality of antennas function as independent antennas.
- one of the two communication systems can be used for a communication system such as NFC (13.56 MHz band), and the other can be used for a communication system of 5 MHz or less.
- both antennas are for NFC communication, and can be used separately for different NFC standards.
- one antenna is a communication system such as NFC (13.56 MHz band), and the other antenna is an antenna for power transmission using 6.78 MHz band such as A4WP (Alliance Wireless Power). Can also be used.
- the coil conductors 21 and 22 are disposed at the opposing edge portions of the planar conductor 10, but the present invention is not limited to this.
- Coil conductors may be arranged at adjacent edge portions of the planar conductor 10 so that the magnetic flux is radiated in the opposite phase.
- the magnetic fluxes of the coil conductors 21 and 22 are radiated in the same phase, and the magnetic fluxes of the coil conductors 21 and 25 are radiated in the opposite phase. Also good. If a planar conductor is disposed between at least two coil conductors for the same system, an antenna device in which a null point is hardly generated can be configured.
- the notch shape part may have opening. That is, the notch-shaped part may have a form in which the outer edge of the planar conductor and the opening are connected via a slit.
- the first antenna including the coil conductors 21 and 22 and the second antenna including the coil conductor 25 are configured, but at least one of the coil openings of the plurality of antennas.
- the parts may be arranged so as to overlap the notch-shaped part. That is, the coil conductor of the antenna of another system (or another standard) may be configured to share the notch shape portion.
- FIG. 5A is a plan view of the antenna device 102 according to the second embodiment
- FIG. 5B is a cross-sectional view taken along the alternate long and short dash line in FIG. 5A.
- Magnetic sheets 51 and 52 are attached to the feeding coils 41 and 42 at positions where the coil conductors 21 and 22 are formed. That is, in the plan view, the magnetic sheets 51 and 52 cover a part of the cutout portions CR1 and CR2.
- the magnetic sheets 51 and 52 are ferrite sheets, which are sintered magnetic ferrite formed into a sheet shape, or a ferrite resin sheet obtained by dispersing magnetic ferrite powder in a resin material.
- the magnetic sheets 51 and 52 cover part of the cutout portions CR1 and CR2, so that the cutout portions CR1 and CR2 are magnetically shielded by the magnetic sheets 51 and 52. Unwanted radiation is suppressed. Further, when other conductors are close to the coil conductors 21 and 22, eddy currents that are generated in the conductors are suppressed. Furthermore, since the inductance of the coil conductors 21 and 22 is increased, a predetermined inductance can be obtained with a small number of turns, and a large coil opening can be secured accordingly.
- FIG. 6 is a plan view of the antenna device 103 according to the third embodiment.
- the coil conductors 21 and 22 are formed by patterning on a flexible substrate. Unlike the first and second embodiments, in this embodiment, the notched portion is not formed in the planar conductor 10.
- planar conductor 10 is disposed between the coil conductors 21 and 22, as in the first and second embodiments, from the vicinity of the opening of one coil conductor to the other.
- the magnetic flux draws a large loop along the planar conductor 10 up to the vicinity of the opening of the coil conductor.
- FIG. 7 is a plan view of the antenna device according to the fourth embodiment.
- the planar conductor 10 has two opposing sides, and part of the coil conductors 21 and 22 overlaps the planar conductor 10. Unlike the embodiments shown so far, the coil conductors 21 and 22 are arranged in axisymmetric positions with respect to the center line (one-dot chain line) of the planar conductor 10. Thereby, the space
- FIG. 8 is a plan view of another antenna device according to the fourth embodiment.
- the coil conductor 21 is disposed so that the two sides of the coil conductor 21 are along the two sides of the notch-shaped portion CR1 formed in the planar conductor 10.
- the coil conductor 22 is arranged so that the two sides of the coil conductor 22 are along the two sides of the notch-shaped portion CR2. Even in such a structure, since the planar conductor 10 is disposed between the coil conductors 21 and 22, the magnetic flux is transmitted from the vicinity of the opening of one coil conductor to the vicinity of the opening of the other coil conductor. Draw a large loop along 10.
- FIG. 9 is a plan view of another antenna device according to the fourth embodiment.
- the planar conductor 10 has a symmetrical center point o, and the coil conductors 21 and 22 are arranged at point-symmetrical positions with respect to the central point o of the planar conductor 10.
- interval of the two coil conductors 21 and 22 in a point-symmetrical relationship can be enlarged, and the area
- FIG. 10 is a plan view of another antenna device according to the fourth embodiment.
- the electric power feeding coils 41 and 42 are comprised as an individual component.
- the two power supply coils 41 and 42 are attached to, for example, a metal part of the housing, and pin terminals (pogo pins) provided on the circuit board are brought into contact with the terminals 31, 32, 33, and 34, respectively.
- pin terminals pins
- 11A, 11B, 11C, and 11D are plan views of the antenna devices 105A, 105B, 105C, and 105D according to the fifth embodiment.
- notched portions CR1, CR2, CR3, and CR4 are formed at four locations around the planar conductor 10.
- the coil conductors 21, 22, 23, 24 are arranged such that the coil openings CA1, CA2, CA3, CA4 of the coil conductors 21, 22, 23, 24 overlap with the notch-shaped portions CR1, CR2, CR3, CR4 in plan view. Is arranged.
- the antenna device 105A shown in FIG. 11A has coil conductors 21, 24 so that the magnetic fluxes generated in the coil conductors 21, 24 are in phase, the magnetic fluxes generated in the coil conductors 22, 23 are in phase, and the magnetic fluxes generated in the coil conductors 21, 22 are out of phase. 22, 23, 24 are connected in series.
- the antenna device 105B shown in FIG. 11B has the coil conductors 21 and 22 such that the magnetic fluxes generated in the coil conductors 21 and 22 are in phase, the magnetic fluxes generated in the coil conductors 23 and 24 are in phase, and the magnetic fluxes generated in the coil conductors 21 and 24 are in reverse phase. 22, 23, 24 are connected in series.
- the antenna device 105C shown in FIG. 11C has the coil conductors 21, 23 so that the magnetic fluxes generated in the coil conductors 21, 23 are in phase, the magnetic fluxes generated in the coil conductors 22, 24 are in phase, and the magnetic fluxes generated in the coil conductors 21, 22 are out of phase. 22, 23, 24 are connected in series.
- the coil conductors 21, 22, 23, and 24 are connected in series so that the magnetic fluxes generated in the coil conductors 22, 23, and 24 are in phase and the magnetic fluxes generated in the coil conductors 21 and 22 are in reverse phase. Has been.
- each antenna device The characteristics of each antenna device are as follows.
- FIG. 11A a large magnetic flux loop is formed in the lateral direction.
- FIG. 11B a large magnetic flux loop is formed in the vertical direction.
- FIG. 11C a large magnetic flux loop is formed in both the vertical and horizontal directions.
- three or more coil conductors may be provided.
- the magnetic flux loop can be enlarged and the directivity of the antenna can be set.
- FIG. 12 is a plan view showing the structure inside the housing of the communication terminal device according to the sixth embodiment.
- This communication terminal device is an example of an electronic apparatus according to the present invention. Inside the upper housing 91, circuit boards 61, 62, 63, a battery pack 90, a camera module 76, and the like are housed. An RFIC 60 including a communication circuit, a resonance capacitor, and the like are mounted on the circuit board 61. The circuit boards 62 and 63 are provided with UHF band antennas 82 and 83, and the like.
- the lower housing 92 is formed with an opening 77 through which the lens of the camera module 76 is optically exposed.
- the lower housing 92 is made of resin, and the planar conductor 10 made of a metal film is formed on the inner surface thereof.
- the planar conductor 10 is formed with notched portions CR1 and CR2, and the coil conductors 21 and 22 are disposed at the positions of the notched portions CR1 and CR2.
- the coil conductors 21 and 22 and the planar conductor 10 constitute an antenna device.
- FIG. 13 is a perspective view of the lower housing of the electronic device according to the seventh embodiment.
- a metal casing is used as a planar conductor, that is, as a radiator of the antenna device.
- the lower housing 92 is a molded body of a metal plate, has a main surface MS and bent surfaces SS1 and SS2 connected to the main surface MS, and an opening 77 for a camera module is formed in the main surface MS.
- a notch-shaped portion CR1 for an operation button is formed on one bent surface SS1 of the lower housing 92.
- the operation buttons are not shown in FIG. 13, the operation buttons are provided so that the operation buttons are exposed outward from the notch-shaped portion CR1.
- a similar notch-shaped part is also formed on the other folding surface SS2.
- the antenna device is configured by arranging the coil conductors in the two notch-shaped portions.
- a part of the plurality of coil conductors overlaps with the metal part of the casing, and a part of the coil opening is easily connected with the metal part of the casing.
- Coil conductors can be arranged so that they do not overlap. That is, in order to arrange the coil conductor as described above, it is not necessary to provide a dedicated notch-shaped part in the metal part of the housing, so that a reduction in mechanical strength of the metal part can be suppressed. Moreover, by having a bent surface, the effective area of a planar conductor becomes large and the range which can communicate is expanded.
- the operation buttons are arranged in the cutout shape portion, but various sensors such as a slide switch, a connector for connection to the outside, a speaker, a light emitting element, an optical sensor, a fingerprint sensor, etc.
- the device may be arranged.
- the two notched portions of the planar conductor are both formed on two bent surfaces connected to the main surface, but only one of the notched portions is formed on one bent surface.
- the area of the planar conductor in which the other notch-shaped part is formed may have a structure that is not bent with respect to the main surface.
- FIG. 14 is a plan view showing the structure inside the housing of the communication terminal device according to the eighth embodiment.
- This communication terminal device is an example of an electronic apparatus according to the present invention. Inside the upper housing 91, circuit boards 61 and 63, a battery pack 90, a camera module 76, and the like are housed. An RFIC 60 including a communication circuit, a resonance capacitor, and the like are mounted on the circuit board 61. The circuit boards 61 and 63 are provided with UHF band antennas 82 and 83, and the like. A ground pattern 61G is formed on the circuit board 61. The ground pattern 61G is an example of a planar conductor according to the present invention.
- the ground pattern is formed with notched portions CR1 and CR2, and coil conductors 21 and 22 are disposed at the positions of the notched portions CR1 and CR2.
- the coil conductors 21 and 22 and the ground pattern 61G constitute an antenna device.
- the coil conductors 21 and 22 may be formed on the circuit board 61 with a conductor pattern.
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Abstract
Description
コイル開口を有する複数のコイル導体と面状導体とを備え、
前記複数のコイル導体は、面状導体の法線方向に巻回軸を有する状態で面状導体の縁端部にそれぞれ配置され、
前記複数のコイル導体は、各コイル導体に生じる磁束が逆相となるように接続されており、
平面視で、複数のコイル導体の一部は面状導体と重なり、コイル開口の一部は面状導体と重ならない、
ことを特徴とする。
アンテナ装置と、このアンテナ装置に接続された給電回路とを備え、
前記アンテナ装置は、
コイル開口を有する複数のコイル導体と面状導体とを備え、
前記複数のコイル導体は、面状導体の法線方向に巻回軸を有する状態で面状導体の縁端部にそれぞれ配置され、
前記複数のコイル導体は、各コイル導体に生じる磁束が逆相となるように接続されており、
平面視で、複数のコイル導体の一部は面状導体と重なり、コイル開口の一部は面状導体と重ならず、
前記面状導体は、筐体の金属部を兼ねている、ことを特徴とする。
アンテナ装置と、このアンテナ装置に接続された給電回路とを備え、
前記アンテナ装置は、
コイル開口を有する複数のコイル導体と面状導体とを備え、
前記複数のコイル導体は、面状導体の法線方向に巻回軸を有する状態で面状導体の縁端部にそれぞれ配置され、
前記複数のコイル導体は、各コイル導体に生じる磁束が逆相となるように接続されており、
平面視で、複数のコイル導体の一部は面状導体と重なり、コイル開口部の一部は面状導体と重ならず、
前記面状導体は、回路基板に形成されている導体の一部である、
ことを特徴とする。
図1(A)、図1(B)は第1の実施形態に係るアンテナ装置101A,101Bの斜視図である。先ず、主にアンテナ装置101Aについて説明する。このアンテナ装置101Aは、コイル開口を有する2つのコイル導体21,22と面状導体10とを備えている。面状導体10は例えば電子機器の筐体の金属部である。コイル導体21,22は、面状導体10の法線方向に巻回軸を有する状態で面状導体10の縁端部にそれぞれ配置されている。面状導体10は一点鎖線で示す対称中心線を有し、コイル導体21,22は面状導体10の中心線に関して線対称位置に配置されている。なお、ここでいう面状導体とは、少なくとも面状に広がっている部分を有する導電性部材のことであり、平面形状だけでなく、曲面形状、また立体形状が有する表面でもよい。
図2は給電コイルの平面図、図3は2つのコイル導体21,22の接続状態および電流経路を示す概略図である。コイル導体21,22は1つのフレキシブル基板にパターン形成されていて、このフレキシブル基板とコイル導体とで給電コイル41,42が構成されている。図2に示す例では、1つのフレキシブル基板にコイル導体21,22が形成されて、2つの給電コイル41,42が1つの部品として構成されている。
図5(A)は第2の実施形態に係るアンテナ装置102の平面図、図5(B)は図5(A)における一点鎖線部分での断面図である。給電コイル41,42には、コイル導体21,22の形成位置に磁性体シート51,52が貼付されている。すなわち、平面視で、磁性体シート51,52は切欠形状部CR1,CR2の一部を覆う。
図6は第3の実施形態に係るアンテナ装置103の平面図である。コイル導体21,22はフレキシブル基板にパターン形成されたものである。第1、第2の実施形態とは異なり、本実施形態では、面状導体10に切欠形状部は形成されていない。
第4の実施形態では、第1~第3の実施形態で示したアンテナ装置の幾つかの変形例について示す。
図11A、図11B、図11C、図11D、は第5の実施形態に係るアンテナ装置105A、105B、105C、105D、の平面図である。いずれも、面状導体10の周囲の4個所に切欠形状部CR1,CR2,CR3,CR4が形成されている。そして、コイル導体21,22,23,24のコイル開口CA1,CA2,CA3,CA4が、平面視で切欠形状部CR1,CR2,CR3,CR4と重なるように、コイル導体21,22,23,24が配置されている。
図11Aにおいて横方向に大きい磁束のループが形成される。
図11Bにおいて縦方向に大きい磁束のループが形成される。
図11Cにおいて縦横両方向に大きい磁束のループが形成される。
図11Dにおいて縦方向、横方向、斜め方向に大きい磁束のループが形成される。
図12は第6の実施形態に係る通信端末装置の筐体内部の構造を示す平面図である。この通信端末装置は本発明に係る電子機器の一例である。上部筐体91の内部には回路基板61,62,63、バッテリーパック90、カメラモジュール76等が収められている。回路基板61には通信回路を備えたRFIC60、共振用キャパシタ等が実装されている。回路基板62,63にはUHF帯アンテナ82,83等が設けられている。
図13は第7の実施形態に係る電子機器の下部筐体の斜視図である。本実施形態では、金属製筐体を面状導体として、すなわちアンテナ装置の放射体として利用する。下部筐体92は金属板の成型体であり、主面MSと主面MSに連接した折り曲げ面SS1,SS2を有し、主面MSにカメラモジュール用の開口77が形成されている。下部筐体92の一方の折り曲げ面SS1には操作ボタン用の切欠形状部CR1が形成されている。図13では操作ボタンは図示していないが、この切欠形状部CR1から外方へ操作ボタンが露出するように、操作ボタンは設けられる。他方の折り曲げ面SS2にも同様の切欠形状部が形成されている。
図14は第8の実施形態に係る通信端末装置の筐体内部の構造を示す平面図である。この通信端末装置は本発明に係る電子機器の一例である。上部筐体91の内部には回路基板61,63、バッテリーパック90、カメラモジュール76等が収められている。回路基板61には通信回路を備えたRFIC60、共振用キャパシタ等が実装されている。回路基板61,63にはUHF帯アンテナ82,83等が設けられている。また、回路基板61にはグランドパターン61Gが形成されている。グランドパターン61Gは本発明に係る面状導体の一例である。このグランドパターンには切欠形状部CR1,CR2が形成されていて、切欠形状部CR1,CR2の位置にコイル導体21,22が配置されている。このコイル導体21,22およびグランドパターン61Gによってアンテナ装置が構成されている。なお、コイル導体21,22は、回路基板61に導体パターンで形成してもよい。
なお、以上に示した各実施形態では、複数のコイル導体を直列接続した例を示したが、並列接続してもよい。また、面状導体は図14に示したように、矩形でなくてもよい。
CR1,CR2,CR3,CR4…切欠形状部
MS…主面
o…対称中心点
SS1…第1折り曲げ面
SS2…第2折り曲げ面
10…面状導体
21,22,23,24…コイル導体
31,32,33,34…端子
41,42…給電コイル
51,52…磁性体シート
60…RFIC
61,62,63…回路基板
61G…グランドパターン
76…カメラモジュール
77…開口
82,83…UHF帯アンテナ
90…バッテリーパック
91…上部筐体
92…下部筐体
101A,101B,102,103,105…アンテナ装置
301…通信相手側アンテナコイル
Claims (10)
- コイル開口を有する複数のコイル導体と面状導体とを備え、
前記複数のコイル導体は、前記面状導体の法線方向に巻回軸を有する状態で前記面状導体の縁端部にそれぞれ配置され、
前記複数のコイル導体は、各コイル導体に生じる磁束が逆相となるように接続されており、
平面視で、前記複数のコイル導体の一部は前記面状導体と重なり、コイル開口の一部は前記面状導体と重ならない、
ことを特徴とする、アンテナ装置。 - 前記複数のコイル導体の前記面状導体と重なる一部は、平面視で、前記面状導体の外縁に沿うように配置されている、請求項1に記載のアンテナ装置。
- 前記複数のコイル導体のうち少なくとも2つのコイル導体は、平面視で、前記面状導体の所定方向に延びる中心線に関して線対称位置に配置されている、請求項1または2に記載のアンテナ装置。
- 前記複数のコイル導体のうち少なくとも2つのコイル導体は、平面視で、前記面状導体の中心点に関して点対称位置に配置されている、請求項1または2に記載のアンテナ装置。
- 前記面状導体は対向する2辺を有し、各辺から対向辺に向かって凹む切欠形状部が形成されており、前記各コイル導体のコイル開口は平面視で前記切欠形状部と重なっている、請求項1~4のいずれかに記載のアンテナ装置。
- 前記面状導体は、主面と、前記主面に連接した折り曲げ面とを有し、前記折り曲げ面に前記切欠形状部が形成されている、請求項5に記載のアンテナ装置。
- 平面視で、前記切欠形状部の少なくとも一部を覆うように磁性体シートを備えた、請求項5または6に記載のアンテナ装置。
- アンテナ装置と、このアンテナ装置に接続された給電回路とを備えた電子機器において、
前記アンテナ装置は、
コイル開口を有する複数のコイル導体と面状導体とを備え、
前記複数のコイル導体は、前記面状導体の法線方向に巻回軸を有する状態で前記面状導体の縁端部にそれぞれ配置され、
前記複数のコイル導体は、各コイル導体に生じる磁束が逆相となるように接続されており、
平面視で、前記複数のコイル導体の一部は前記面状導体と重なり、コイル開口の一部は前記面状導体と重ならず、
前記面状導体は、筐体の金属部を兼ねている、
ことを特徴とする電子機器。 - 前記筐体の金属部は、主面と、前記主面に連接した折り曲げ面とを有し、この折り曲げ面にデバイス用の切欠形状部が形成されていて、前記複数のコイル導体のうち少なくとも1つのコイル導体のコイル開口は前記切欠形状部に重なっている、請求項8に記載の電子機器。
- アンテナ装置と、このアンテナ装置に接続された給電回路とを備えた電子機器において、
前記アンテナ装置は、
コイル開口を有する複数のコイル導体と面状導体とを備え、
前記複数のコイル導体は、前記面状導体の法線方向に巻回軸を有する状態で前記面状導体の縁端部にそれぞれ配置され、
前記複数のコイル導体は、各コイル導体に生じる磁束が逆相となるように接続されており、
平面視で、前記複数のコイル導体の一部は前記面状導体と重なり、コイル開口部の一部は前記面状導体と重ならず、
前記面状導体は、回路基板に形成されている導体の一部である、
ことを特徴とする電子機器。
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