WO2013153770A1 - アンテナ装置 - Google Patents
アンテナ装置 Download PDFInfo
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- WO2013153770A1 WO2013153770A1 PCT/JP2013/002239 JP2013002239W WO2013153770A1 WO 2013153770 A1 WO2013153770 A1 WO 2013153770A1 JP 2013002239 W JP2013002239 W JP 2013002239W WO 2013153770 A1 WO2013153770 A1 WO 2013153770A1
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- antenna element
- antenna
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- end portion
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q5/00—Arrangements for simultaneous operation of antennas on two or more different wavebands, e.g. dual-band or multi-band arrangements
- H01Q5/30—Arrangements for providing operation on different wavebands
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q1/00—Details of, or arrangements associated with, antennas
- H01Q1/27—Adaptation for use in or on movable bodies
- H01Q1/32—Adaptation for use in or on road or rail vehicles
- H01Q1/325—Adaptation for use in or on road or rail vehicles characterised by the location of the antenna on the vehicle
- H01Q1/3275—Adaptation for use in or on road or rail vehicles characterised by the location of the antenna on the vehicle mounted on a horizontal surface of the vehicle, e.g. on roof, hood, trunk
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q21/00—Antenna arrays or systems
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q21/00—Antenna arrays or systems
- H01Q21/30—Combinations of separate antenna units operating in different wavebands and connected to a common feeder system
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q9/00—Electrically-short antennas having dimensions not more than twice the operating wavelength and consisting of conductive active radiating elements
- H01Q9/04—Resonant antennas
- H01Q9/30—Resonant antennas with feed to end of elongated active element, e.g. unipole
- H01Q9/42—Resonant antennas with feed to end of elongated active element, e.g. unipole with folded element, the folded parts being spaced apart a small fraction of the operating wavelength
Definitions
- the present disclosure relates to an antenna device including a plurality of antenna elements each having a different operating frequency band.
- Patent Document 1 discloses a configuration in which a plurality of antenna elements having different operating frequency bands are erected in the vicinity of a planar base plate.
- the present disclosure has been made in view of the above points, and an object thereof is to provide an antenna device capable of appropriately obtaining desired directivity and gain for an antenna element.
- the antenna device includes a first antenna element and a second antenna element.
- the first antenna element operates in a first predetermined frequency band
- the second antenna element operates in a second predetermined frequency band different from the first predetermined frequency band.
- the first antenna element is disposed between a proximal end portion, a distal end portion, a folded portion, a first side portion disposed between the proximal end portion and the folded portion, and between the folded portion and the distal end portion.
- a second side The current vector direction in the first side is the same direction as the current vector direction in the second side.
- the second antenna element is disposed in proximity to the first antenna element.
- FIG. 1 is a perspective view illustrating an antenna device according to a first embodiment of the present disclosure.
- FIG. 2 is a front view of the antenna device according to the first embodiment.
- FIG. 3 is a diagram illustrating the directivity of the horizontal plane of the antenna device according to the first embodiment.
- FIG. 4 is a front view of the antenna device to be compared,
- FIG. 5 is a diagram illustrating the directivity of the horizontal plane of the antenna device to be compared,
- FIG. 6 is a perspective view showing an antenna apparatus according to the second embodiment of the present disclosure.
- FIG. 7 is a front view of an antenna device according to a third embodiment of the present disclosure.
- FIG. 8 is a rear view of the antenna device according to the third embodiment.
- FIG. 9 is a front view of an antenna device according to a fourth embodiment of the present disclosure.
- FIG. 10 is a rear view of the antenna device according to the fourth embodiment.
- FIG. 11 is a longitudinal front view showing an antenna device according to the fifth embodiment of the present disclosure;
- FIG. 12 is a front view illustrating an antenna device according to a sixth embodiment of the present disclosure.
- FIG. 13 is a perspective view illustrating an antenna device according to a seventh embodiment of the present disclosure.
- the antenna device 1 is used, for example, in an antenna element 10 used in a vehicle-to-vehicle communication system having an operating frequency band of 5.9 GHz (GHz) band, and in a mobile phone system having an operating frequency band of 900 MHz (MHz) band, for example.
- This is an in-vehicle integrated antenna device having an antenna element 4.
- the antenna device 1 further includes a ground plane 2 having a planar shape.
- the ground plane 2 is made of a metal plate having a substantially rectangular shape, for example.
- the ground plane 2 is used by being electrically connected to a sufficiently large metal body with respect to the operating frequency wavelength of the antenna element 4 described later.
- a planar substrate 3 made of, for example, a resin is erected substantially vertically on the upper surface 2a of the base plate 2. Substantially vertical includes a state close to vertical.
- a folded monopole antenna element 4 is formed on one surface 3a of the substrate 3 by a conductor pattern (conductor film).
- the folded monopole antenna element 4 is also referred to as a first antenna element, and a frequency band in which the first antenna element operates, for example, a 900 megahertz (MHz) band is also referred to as a first predetermined frequency band.
- the first antenna element 4 is an antenna element that transmits and receives radio waves of a mobile phone system having an operating frequency band of, for example, 900 MHz, and is electrically connected (conducted) to the ground plane 2 and a base end portion 4a. It has the front-end
- the first antenna element 4 further has a side part 5 from the base end part 4a to the folded part 4c and a side part 6 from the folded part 4c to the distal end part 4b.
- the side 5 is also referred to as a first side
- the side 6 is also referred to as a second side.
- the lengths of the first side and the second side are electrically 1 ⁇ 4 wavelength.
- the length of each of the first side portion and the second side portion is a length obtained by multiplying the wavelength of the radio wave in the 900 MHz band by 1/4 and further multiplying the wavelength shortening rate by the relative dielectric constant of the material of the substrate 3. is there. That is, the length from the base end portion 4a to the tip end portion 4b of the first antenna element 4 is, for example, multiplied by 1/2 to the wavelength of the radio wave in the 900 MHz band, and further the wavelength shortening due to the relative dielectric constant of the material of the substrate 3 It is the length multiplied by the rate.
- the length from the base end portion 4a to the tip end portion 4b of the first antenna element 4 is also referred to as an element length.
- the tip 4b of the first antenna element 4 and the ground plane 2 are at the same potential.
- the base end portion 4a of the first antenna element 4 is provided with a feeding point 7 for supplying power to the first antenna element 4, and the first antenna element 4 operates using the ground plane 2 as an antenna ground.
- the feeding point 7 is provided away from the first antenna element 4, the feeding point 7 and the base end portion 4 a of the first antenna element 4 may be connected by a microstrip line.
- the feeding point 7 is configured, for example, by connecting the inner conductor of the coaxial cable 8 to the proximal end portion 4 a of the first antenna element 4 and connecting the outer conductor of the coaxial cable 8 to the ground plane 2. Is done.
- the first antenna element 4 is folded so that the distance d (clearance) along the direction perpendicular to the ground plane 2 between the first side 5 and the second side 6 is constant. It is bent at the portion 4c.
- the second side 6 of the first antenna element 4 has a wide portion 9 that is formed integrally with the upper half of the second side 6.
- the monopole antenna element 10 has a linear shape and has a proximal end portion 10a and a distal end portion 10b.
- the base end portion 10 a of the monopole antenna element 10 is electrically connected to the upper end portion 9 a of the wide portion 9 (conducting), thereby being electrically connected to the wide portion 9.
- the monopole antenna element 10 is also referred to as a second antenna element, and a frequency band in which the second antenna element operates, for example, a 5.9 GHz band is also referred to as a second predetermined frequency band.
- the second antenna element 10 is formed so as to extend in a substantially vertical direction.
- the second antenna element 10 is connected so as to move away from the wide portion 9 as it goes from the base end portion 10a to the tip end portion 10b.
- the length of the second antenna element 10 is electrically 1 ⁇ 4 wavelength.
- the length of the second antenna element 10 is also referred to as the element length of the second antenna element 10.
- the element length of the second antenna element 10 is, for example, a length obtained by multiplying the wavelength of a radio wave of 5.9 GHz band by 1/4 and further multiplying the wavelength shortening rate by the relative dielectric constant of the material of the substrate 3.
- the horizontal width of the wide portion 9 with respect to the ground plane 2 is, for example, a length obtained by multiplying the wavelength of a radio wave in the 5.9 GHz band by 1/4 and further multiplying the wavelength shortening rate by the relative dielectric constant of the material of the substrate 3. long.
- the base end portion 10a of the second antenna element 10 is provided with a feeding point 11 for supplying power to the second antenna element 10, and the second antenna element 10 operates using the wide portion 9 as an antenna ground.
- the feeding point 11 is provided away from the second antenna element 10, the feeding point 11 and the base end portion 10a of the second antenna element 10 may be connected by a microstrip line.
- the feeding point 11 is formed by connecting the inner conductor of the coaxial cable 12 to the proximal end portion 10 a of the second antenna element 10 and connecting the outer conductor of the coaxial cable 12 to the wide portion 9.
- the second antenna element 10 may have a shape having a predetermined width.
- the antenna device 1 configured as described above is mounted (in parallel) so that the plane of the ground plane 2 is along the upper surface of the vehicle roof (not shown) in a state of being incorporated in a housing case (not shown). It is done. That is, the second antenna element 10 is mounted on the vehicle so that the axis of the second antenna element 10 is perpendicular to the main plate 2.
- the axis perpendicular to the ground plane 2 is taken as the Z axis
- the axis perpendicular to the Z axis and perpendicular to the surface on which the first antenna element 4 is formed is taken as the Y axis
- the axes perpendicular to the Z axis and the Y axis are taken as the X axis.
- the X axis is parallel to the surface on which the first antenna element 4 is formed.
- the XY plane defined by the X axis and the Y axis is also referred to as a horizontal plane. That is, the horizontal plane is a plane parallel to the main plate 2.
- FIG. 4 shows an antenna device 21 that employs a monopole antenna element 22 that is not a folded shape as an antenna element used in a 900 MHz band mobile phone system.
- FIG. 5 shows the result of simulating the directivity in the horizontal plane of the antenna element 22 shown in FIG.
- the antenna element used in the 900 MHz band mobile phone system is formed by the folded monopole antenna element 4 than the structure formed by the monopole antenna element 22 which is not folded.
- the gain of the horizontal plane is improved by 3 decibels (dB) on average.
- the first antenna element 4 employs a folded monopole antenna element, and its front end portion 4b has the same potential as the ground plane 2.
- Element 4 is equivalent to a half of a loop antenna having an element length corresponding to one wavelength of radio waves in the operating frequency band. Therefore, in the first antenna element 4, the direction of the current vector at the base end portion 4a and the tip end portion 4b is opposite to the direction of the current vector at the folded portion 4c (one is a so-called antinode and the other is a so-called node). become).
- the current vectors are in the same direction in the first side part 5 from the base end part 4a to the folded part 4c and the second side part 6 from the folded part 4c to the distal end part 4b. That is, induced currents in opposite directions with current vectors that cancel each other do not flow, and the horizontal plane gain of the first antenna element 4 does not decrease.
- the first antenna element 4 used in the 5.9 GHz band inter-vehicle communication system is formed by the folded monopole antenna element erected on the ground plane 2.
- the front end 4b has the same potential as the ground plane 2 and the ground plane 2 operates as an antenna ground.
- the second antenna element 10 used in the 900 MHz band mobile phone system is configured by a monopole antenna element so that the wide portion 9 which is a part of the first antenna element 4 operates as an antenna ground.
- the folded monopole first antenna element 4 can be equivalent to a half portion of a loop antenna having an element length corresponding to one wavelength of a radio wave in the operating frequency band.
- the second antenna element 10 operates using the wide portion 9 of the first antenna element 4 as an antenna ground, it is easy to dispose the first antenna element 4 and the second antenna element 10 close to each other. The whole can be reduced in size.
- the antenna ground of the second antenna element 10 is formed wide, the current path can be increased compared with the case where the antenna ground is formed narrow, and the bandwidth can be increased.
- the second antenna element 10 operates using the wide portion 9 that is a part of the first antenna element 4 as an antenna ground. Therefore, it is not necessary to newly form a wiring circuit or a pattern on the substrate, and the entire apparatus can be reduced in size.
- the antenna element (first antenna element 4) whose operating frequency band is on the low frequency side is provided by a folded monopole antenna element, and the antenna element on the high frequency side (second antenna element 10) is mono. And a pole-type antenna element. Further, the antenna element with the operating frequency band on the low frequency side may be provided by the monopole antenna element, and the antenna element on the high frequency side may be provided by the folded monopole antenna element.
- the antenna element (first antenna) on the low frequency side is used as shown in this embodiment for the following reason.
- the element 4) is advantageously provided by a folded monopole antenna element
- the high-frequency antenna element (second antenna element 10) is advantageously provided by a monopole antenna element.
- the second antenna element 10 on the high frequency side may be disposed on the upper side of the antenna device 1
- the first antenna element 4 on the low frequency side may be disposed on the lower side of the antenna device 1.
- the high frequency radio wave whose operating frequency band is in the GHz band has a characteristic that it is easily attenuated depending on the distance, and it is particularly important to secure a desired gain in the antenna device that receives the high frequency in the GHz band.
- the surface of the vehicle roof to which the antenna device 1 is attached is often curved in a gentle convex shape.
- the convex portion of the vehicle roof exists as an obstacle in front of the antenna device (FRONT), ensuring the desired directivity in front of the vehicle. There is a problem that it is difficult to do.
- the second antenna element 10 on the high frequency side is disposed above the first antenna element 4 on the low frequency side, so that the first antenna element 4 on the low frequency side is second on the high frequency side.
- the line-of-sight (front field of view) from the second antenna element 10 on the high frequency side to the front of the vehicle is improved, and the directivity in front of the vehicle can be appropriately ensured.
- an antenna device 31 according to the second embodiment of the present disclosure will be described with reference to FIG.
- the antenna device 31 according to the second embodiment is different from the antenna device 1 according to the first embodiment in the position of the second antenna element 32 with respect to the wide portion 9 of the first antenna element 4.
- a second antenna element 32 provided by a monopole antenna element has a linear shape, and a base end portion 32a thereof is electrically connected to a lower end portion 9b of the wide portion 9 (conduction). Thus, it is electrically connected to the wide portion 9. Further, the second antenna element 32 is formed to extend in a substantially vertical direction. That is, the second antenna element 32 is also connected so as to move away from the wide portion 9 from the base end portion 32a toward the tip end portion 32b. The length (element length) of the antenna element 32 is also electrically 1 ⁇ 4 wavelength.
- the length of the antenna element 32 is a length obtained by multiplying the wavelength of the radio wave in the 5.9 GHz band by 1/4 and further multiplying the wavelength shortening rate by the relative dielectric constant of the material of the substrate 3.
- the base end portion 32 a of the second antenna element 32 is provided with a feeding point 32 for supplying power to the second antenna element 32, and the second antenna element 32 also has the wide portion 9 of the first antenna element 4. Operates as antenna ground.
- the antenna device 31 according to the second embodiment can also obtain the same effects as the antenna device 1 according to the first embodiment.
- the antenna device 41 according to the third embodiment is characterized in that first antenna elements having two first sub-antenna elements 42 and 421 provided by folded monopole antenna elements are formed on both sides of the substrate. Different from the antenna device 1 according to the first embodiment.
- a second surface provided on one surface 3a of the substrate 3 by a first sub antenna element 421 corresponding to the first antenna element 4 described in the first embodiment and a monopole antenna element.
- An antenna element 10 is formed.
- the first sub antenna element 421 has a configuration similar to that of the first antenna element 4 of the first embodiment.
- another first sub antenna element 42 provided by a folded monopole antenna element is formed by a conductor pattern.
- the first sub-antenna element 42 is an antenna element that transmits and receives radio waves of a mobile phone system having an operating frequency band of, for example, 2 gigahertz (GHz) band, and its base end portion 42a is folded back via the via 43. While being electrically connected to the base end portion 4 a of the element 421, the tip end portion 42 b is electrically connected to the main plate 2.
- the lengths of the first side portion 44 from the base end portion 42a of the first sub antenna element 42 to the folded portion 42c and the length of the second side portion 45 from the folded portion 42c to the distal end portion 42b are electrically 1 ⁇ 4. Is the wavelength.
- the length of each of the first side portion and the second side portion is obtained by multiplying the wavelength of the radio wave in the 2 GHz band by 1 ⁇ 4, and further multiplying the wavelength shortening rate by the relative dielectric constant of the material of the substrate 3. That's it. That is, the length (element length) from the base end portion 42a to the tip end portion 42b of the first sub antenna element 42 is multiplied by 1/2 to the wavelength of the radio wave in the 2 GHz band, for example, and the ratio of the material of the substrate 3 It is the length multiplied by the wavelength shortening rate due to the dielectric constant.
- the interval along the vertical direction between the first side portion 44 and the second side portion 45 sandwiching the folded portion 42c of the first sub antenna element 42 is also constant.
- the antenna device 41 according to the third embodiment can also obtain the same operational effects as the antenna device 1 according to the first embodiment. That is, desired directivity and gain can be appropriately obtained for the first sub-antenna element 421 standing on the ground plane 2, and the desired directivity is also obtained for the other first sub-antenna element 42 standing on the ground plane 2. Sex and gain can be obtained appropriately. Further, in this case, it is possible to increase the number of functions corresponding to three bands having different operating frequency bands. Furthermore, since the first sub antenna element 4 and the first sub antenna element 42 are configured on the same substrate and the feeding point 7 is made common, the configuration can be simplified.
- an antenna device 51 according to a fourth embodiment of the present disclosure will be described with reference to FIGS. 9 and 10.
- the first side 55 and the second side 53 of the first antenna element provided by the folded monopole antenna element are respectively formed on both sides of the substrate. Is different from the antenna device 1 according to the first embodiment.
- a first antenna element 52 provided by a folded monopole antenna element corresponding to the first antenna element 4 described in the first embodiment is formed on the substrate 3.
- the second side 53 and the wide portion 54 corresponding to the second side 6 and the wide portion 9 described in the first embodiment are formed on the one surface 3a of the substrate 3, respectively.
- a first side 55 corresponding to the first side 5 described in the first embodiment is formed on the other surface 3 b of the substrate 3.
- the second side 53 and the first side 55 are electrically connected via a via 56.
- a feeding point 57 is provided at the proximal end portion of the first side portion 55, and the second antenna element 10 is connected to the wide portion 54.
- the antenna device 51 according to the fourth embodiment can also obtain the same operational effects as the antenna device 1 according to the first embodiment.
- an antenna device 61 according to a fifth embodiment of the present disclosure will be described with reference to FIG.
- the shape of the first antenna element 65 provided by the substrate 64 and the folded monopole antenna element follows the shape of the housing case attached to the vehicle roof. Different from the antenna device 1 according to the first embodiment.
- the antenna device 61 is attached to the vehicle roof while being housed in the housing case 62.
- the antenna device 61 includes a ground plane 63, a substrate 64, a first antenna element 65, a feeding point 66, a second antenna element 67 provided by a monopole antenna element, a feeding point 68, coaxial cables 69 and 70, and the like.
- the ground plate 63, the substrate 64, the first antenna element 65, the feeding point 66, the second antenna element 67, the feeding point 68, and the coaxial cables 69 and 70 are the ground plate 2, the substrate 3, and the first described in the first embodiment.
- the functions are the same as those of the antenna element 4, the feeding point 7, the second antenna element 10, the feeding point 11, and the coaxial cables 8 and 12.
- the antenna device 61 according to the fifth embodiment can also obtain the same operational effects as the antenna device 1 according to the first embodiment. Further, since the shape of the first antenna element 65 follows the shape of the housing case 62 attached to the vehicle roof and is bent near the center, the antenna element having the same antenna length (current path length) is not bent. Compared with the case where it mounts, a dimension can be shortened and the whole apparatus can be reduced in size. In addition, even when the entire apparatus is downsized, it is easy to secure a necessary antenna length, and desired antenna characteristics can be appropriately ensured.
- the antenna device 71 according to the sixth embodiment is that the antenna element (first antenna element 73) for transmitting and receiving radio waves of the mobile phone system is provided by a folded dipole antenna. Is different.
- a first antenna element 73 provided by a folded dipole antenna element is formed on a surface 72a on one side of the substrate 72 by a conductor pattern.
- the lengths of the two first side portions 74 and the second side portions 75 of the first antenna element 73 are, for example, the wavelength due to the relative dielectric constant of the material of the substrate 72 by multiplying the wavelength of the radio wave in the 900 MHz band by 1/2.
- the length multiplied by the shortening rate. That is, the total length (element length) of the antenna element 73 is, for example, a length obtained by multiplying the wavelength of a radio wave in the 900 MHz band by 1 and further multiplying the wavelength shortening rate by the relative dielectric constant of the material of the substrate 72.
- the second side portion 75 has a wide portion 76 formed integrally with the upper half portion of the second side portion 75.
- the wide portion 76 of the second side portion 75 corresponds to the wide portion 9 described in the first embodiment.
- a feeding point 77 is provided at a substantially central portion of the first side portion 74, and the monopole second antenna element 10 is connected to the wide portion 76.
- the antenna device 71 according to the sixth embodiment can also obtain the same functions and effects as those of the antenna device 1 according to the first embodiment. Further, by adopting a folded dipole antenna element as the first antenna element 73, an advantageous configuration can be obtained when the antenna element is disposed away from a body metal such as a dashboard.
- an antenna device 81 according to a seventh embodiment of the present disclosure will be described with reference to FIG.
- the second antenna element 83 provided by the monopole antenna element is compared with the surface of the wide portion 76 of the first antenna element 73 provided by the folded dipole antenna element.
- the antenna device 1 is different from the antenna device 1 according to the first embodiment in that the antenna device is erected in a substantially vertical direction.
- a first antenna element 73 provided by the folded dipole antenna element described in the sixth embodiment is formed on one surface 82a of the substrate 82.
- the second antenna element 83 provided by the monopole antenna element corresponding to the second antenna element 10 described in the first embodiment has a base end portion 83a electrically connected to the surface of the wide portion 76. , And is erected in a direction substantially perpendicular to the surface of the wide portion 76. That is, the antenna element 83 is connected so as to move away from the wide portion 76 along a direction perpendicular to the surface of the wide portion 76 as it goes from the base end portion 83a to the distal end portion 83b.
- a feeding point 84 is provided at the base end 83 a of the antenna element 83.
- the antenna device 81 according to the seventh embodiment can also obtain the same operational effects as the antenna device 71 according to the sixth embodiment.
- the antenna device described above is carried in a vehicle-to-vehicle communication system such as a road-vehicle communication system. Furthermore, the antenna device may be applied to a vehicle-mounted antenna device used in another communication system other than the inter-vehicle communication system such as a road-vehicle communication system. Further, the present invention is not limited to the in-vehicle antenna device mounted on the vehicle, but may be applied to an antenna device mounted on another device, for example.
- the substrate may be composed of a multilayer substrate having a plurality of layers, and the plurality of antenna elements may be formed on different layers of the same multilayer substrate.
- the substrate may be a flexible substrate that can be curved to some extent, or a substrate on which an electronic component or the like can be mounted. That is, any substrate may be used as long as it can form a plurality of antenna elements.
- the ground plane on which the board is erected does not have to be a perfect plane, and may have a certain degree of curvature or the like as long as it functions as an antenna ground of an antenna element formed on the board.
- the antenna element may be composed of a metal plate or the like.
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Abstract
Description
以下、本開示の第1の実施形態によるアンテナ装置1について図1乃至図5を参照して説明する。アンテナ装置1は、例えば5.9ギガヘルツ(GHz)帯を動作周波数帯域とする車々間通信システムで用いられるアンテナエレメント10と、例えば900メガヘルツ(MHz)帯を動作周波数帯域とする携帯電話システムで用いられるアンテナエレメント4とを有する車載統合アンテナ装置である。アンテナ装置1は、さらに平面形状を持つ地板2を有する。地板2は、例えば略長方形をなす金属板からなる。地板2は、後述するアンテナエレメント4の動作周波数波長に対し、十分に大きな金属体に電気的に接続されて使用される。地板2の上面部2aには例えば樹脂からなる平面形状の基板3が略垂直に立設されている。略垂直は、垂直に近い状態も含む。基板3の一方側の面3aには折り返しモノポール型のアンテナエレメント4が導体パターン(導体膜)により形成されている。折り返しモノポール型のアンテナエレメント4は、第1アンテナエレメントとも称し、第1アンテナエレメントが作動する周波数帯域、例えば900メガヘルツ(MHz)帯を第1所定の周波数帯域とも称する。
次に、本開示の第2の実施形態によるアンテナ装置31について、図6を参照して説明する。尚、上記した第1の実施形態と同一部分については説明を省略し、異なる部分について説明する。第2の実施形態によるアンテナ装置31は、第2アンテナエレメント32の第1アンテナエレメント4の幅広部9に対する位置が第1の実施形態によるアンテナ装置1とは異なる。
次に、本開示の第3の実施形態によるアンテナ装置41ついて、図7及び図8を参照して説明する。尚、上記した第1の実施形態と同一部分については説明を省略し、異なる部分について説明する。第3の実施形態によるアンテナ装置41は、折り返しモノポール型のアンテナエレメントにより提供される2つの第1サブアンテナエレメント42,421を有する第1アンテナエレメントが基板の両面部に形成されている点が第1の実施形態によるアンテナ装置1とは異なる。
次に、本開示の第4の実施形態によるアンテナ装置51について、図9及び図10を参照して説明する。尚、上記した第1の実施形態と同一部分については説明を省略し、異なる部分について説明する。第4の実施形態によるアンテナ装置51は、折り返しモノポール型のアンテナエレメントにより提供される第1アンテナエレメントの第1辺部55と第2辺部53がそれぞれ基板の両面部に形成されている点が第1の実施形態によるアンテナ装置1とは異なる。
次に、本開示の第5の実施形態によるアンテナ装置61ついて、図11を参照して説明する。尚、上記した第1の実施形態と同一部分については説明を省略し、異なる部分について説明する。第5の実施形態によるアンテナ装置61は、基板64及び折り返しモノポール型のアンテナエレメントにより提供される第1アンテナエレメント65の形状が車両ルーフに取り付けられる筐体ケースの形状に追従している点が第1の実施形態によるアンテナ装置1とは異なる。
次に、本開示の第6の実施形態によるアンテナ装置71について、図12を参照して説明する。尚、上記した第1の実施形態と同一部分については説明を省略し、異なる部分について説明する。第6の実施形態によるアンテナ装置71は、携帯電話システムの電波を送受信するアンテナエレメント(第1アンテナエレメント73)が折り返しダイポール型のアンテナにより提供されている点が第1の実施形態によるアンテナ装置1とは異なる。
次に、本開示の第7の実施形態によるアンテナ装置81ついて、図13を参照して説明する。尚、上記した第6の実施形態と同一部分については説明を省略し、異なる部分について説明する。第7の実施形態によるアンテナ装置81は、モノポール型のアンテナエレメントにより提供される第2アンテナエレメント83が折り返しダイポール型のアンテナエレメントにより提供される第1アンテナエレメント73の幅広部76の面に対して略垂直方向に立設されている点が第1の実施形態によるアンテナ装置1とは異なる。
本開示によると、上記したアンテナ装置は路車間通信システム等、車々間通信システムで持ちいれる。さらに、上記アンテナ装置は路車間通信システム等、車々間通信システム以外の別の通信システムで用いられる車載アンテナ装置に適用しても良い。又、車両に搭載される車載アンテナ装置に限らず、例えば別の装置に搭載されるアンテナ装置に適用しても良い。
Claims (7)
- 第1所定の周波数帯域で動作する第1アンテナエレメント(4,52,65,73)と
前記第1所定の周波数帯域とは異なる第2所定の周波数帯域で動作する第2アンテナエレメント(10,32,67,83)とを備え、
前記第1アンテナエレメントは、基端部(4a)、先端部(4b)、折り返し部(4c)、前記基端部と前記折り返し部の間に配置されている第1辺部(5、55、74)、前記折り返し部と前記先端部の間で配置されている第2辺部(6、53、75)とを有し、
前記第1辺部においての電流ベクトル方向は、前記第2辺部においての電流ベクトル方向と同一方向であり、
前記第2アンテナエレメントは、前記第1アンテナエレメントに近接して配置したアンテナ装置。 - 平面形状の地板(2、63)をさらに備え、
前記第1アンテナエレメント(4,52,65)は前記地板に立設され、
前記第1アンテナエレメントは前記折り返し部で前記第1辺部(5、55)と前記第2辺部(6、53)の間隔が一定となるように折り曲げられてあり、
前記第1アンテナエレメントは、前記地板をアンテナグランドとして動作する折り返しモノポール型のアンテナエレメントであり、
前記先端部は、前記地板と同電位である請求項1に記載したアンテナ装置。 - 前記第2アンテナエレメントは、前記第1アンテナエレメントの一部をアンテナグランドとして動作する請求項1又は2に記載したアンテナ装置。
- 前記第1アンテナエレメント(4)は、複数の第1サブアンテナエレメント(42、421)を含む請求項1乃至3の何れかに記載したアンテナ装置。
- 前記複数の第1サブアンテナエレメントは、共通の給電点(7)により電力を供給される請求項4に記載したアンテナ装置。
- 前記複数の第1サブアンテナエレメントを同一の基板(3)に形成した請求項4又は5に記載したアンテナ装置。
- 前記基板(3)は、複数の層を有する多層基板であり、
前記第1アンテナエレメント(52)の前記第1辺部(53)は、前記基板の1つの層に形成され、
前記第1アンテナエレメント(52)の前記第2辺部(55)は、前記基板の前記一つの層と異なる他の層に形成された請求項1乃至6の何れかに記載したアンテナ装置。
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JP6150287B2 (ja) * | 2013-08-21 | 2017-06-21 | 国立研究開発法人情報通信研究機構 | 広帯域アンテナ |
JP6206243B2 (ja) * | 2014-02-21 | 2017-10-04 | 株式会社Soken | 集合アンテナ装置 |
EP3203578B1 (en) * | 2014-10-03 | 2020-12-30 | AGC Inc. | Antenna device |
US9666937B2 (en) * | 2015-06-29 | 2017-05-30 | Waymo Llc | LTE MIMO antenna system for automotive carbon fiber rooftops |
JP6336422B2 (ja) * | 2015-09-29 | 2018-06-06 | 原田工業株式会社 | アンテナ装置 |
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JP5961027B2 (ja) | 2016-08-02 |
DE112013002000T5 (de) | 2014-12-31 |
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