WO2021079430A1 - Antenna device and wireless communication device - Google Patents

Antenna device and wireless communication device Download PDF

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Publication number
WO2021079430A1
WO2021079430A1 PCT/JP2019/041501 JP2019041501W WO2021079430A1 WO 2021079430 A1 WO2021079430 A1 WO 2021079430A1 JP 2019041501 W JP2019041501 W JP 2019041501W WO 2021079430 A1 WO2021079430 A1 WO 2021079430A1
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WO
WIPO (PCT)
Prior art keywords
antenna
antenna element
frequency
antenna device
dielectric substrate
Prior art date
Application number
PCT/JP2019/041501
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French (fr)
Japanese (ja)
Inventor
貴裕 篠島
洋平 古賀
泰光 伴
旅人 殿岡
聡史 ▲崎▼田
学 吉川
Original Assignee
富士通コネクテッドテクノロジーズ株式会社
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Application filed by 富士通コネクテッドテクノロジーズ株式会社 filed Critical 富士通コネクテッドテクノロジーズ株式会社
Priority to JP2021553204A priority Critical patent/JP7405862B2/en
Priority to PCT/JP2019/041501 priority patent/WO2021079430A1/en
Publication of WO2021079430A1 publication Critical patent/WO2021079430A1/en

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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
    • 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
    • H01Q5/378—Combination of fed elements with parasitic elements
    • 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
    • H01Q5/378—Combination of fed elements with parasitic elements
    • H01Q5/385—Two or more parasitic elements
    • 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

Definitions

  • the present invention relates to an antenna device and a wireless communication device.
  • Wireless communication devices such as smartphones, tablet computers, and vehicles equipped with in-vehicle antennas perform communication using a plurality of frequency bands in order to realize high-speed communication, for example. Therefore, the wireless communication device is equipped with an antenna device corresponding to a plurality of frequency bands.
  • Patent Document 1 the horizontal portion of the first antenna element is arranged on the upper side and the horizontal portion of the second antenna element is arranged on the lower side, and the feeding points of the first antenna element and the second antenna element are arranged.
  • Patent Document 2 discloses an antenna device corresponding to a plurality of frequencies by providing a plurality of inverted F antennas.
  • an antenna device in which a plurality of antenna elements are run side by side on the same plane has also been used.
  • the antenna element is thinly formed by, for example, Laser Direct Structuring (LDS) or the like. Since a plurality of antenna elements running side by side on the same plane are capacitively coupled on each side, the coupling capacitance (capacitance) generated by the capacitive coupling depends on the thickness of the antenna element. Since the antenna element is formed thin, the coupling capacitance tends to be small.
  • Such an antenna device has a problem that the characteristics of the high-pass filter (HPF) become remarkable due to the small coupling capacitance, and the performance at a low frequency (for example, 2 GHz or less) deteriorates. Further, since the area of the antenna device increases when a plurality of antenna elements are run side by side on the same plane, the design is not preferable for the miniaturization of the antenna device and the wireless communication device on which the antenna device is mounted.
  • LDS Laser Direct Structuring
  • One aspect of the disclosed technology is to provide an antenna device that can operate on a plurality of frequencies and is easily miniaturized, and a wireless communication device provided with the antenna device.
  • This antenna device is electrically connected to a dielectric substrate and a feeding portion provided on one surface of the dielectric substrate and one end of which is provided on the other surface of the dielectric substrate, and is a first frequency radio wave.
  • the plate-shaped first antenna element operating in the above and the other surface are provided so that at least a part thereof overlaps with the first antenna element in the plan view of the dielectric substrate, and one end thereof is provided on the other surface. It is provided with a plate-shaped second antenna element that is electrically connected to the grounding portion and has the other end located closer to the feeding portion than the grounding portion and operates with a second frequency radio wave.
  • the disclosed technology is capable of operating on multiple frequencies and is easy to miniaturize.
  • FIG. 1 is a diagram showing an example of an antenna device according to an embodiment.
  • FIG. 2 is a plan view of the antenna device according to the embodiment from the + Z direction.
  • FIG. 3 is a diagram showing an example of an antenna device according to a comparative example.
  • FIG. 4 is a diagram showing an example of the antenna device according to the first modification.
  • FIG. 5 is a plan view of the antenna device according to the first modification from the + Z direction.
  • FIG. 6 is a diagram showing an example of the antenna device according to the second modification.
  • the antenna device according to the embodiment is Dielectric substrate and A plate-shaped first antenna element provided on one surface of the dielectric substrate, one end of which is electrically connected to a feeding portion provided on the other surface of the dielectric substrate, and operates with radio waves of the first frequency.
  • a plate-shaped second antenna element whose end is located closer to the feeding portion than the grounding portion and operates on a radio wave of a second frequency is provided.
  • This antenna device is installed, for example, with the other surface of the dielectric substrate facing the ground substrate.
  • the power feeding unit supplies power to the first antenna element by being electrically connected to, for example, a feeding point provided on the ground board.
  • the grounding portion grounds the second antenna element by being electrically connected to, for example, a grounding terminal provided on the ground board.
  • This antenna device is arranged so that at least a part of the plate-shaped second antenna element overlaps with the plate-shaped first antenna element in the plan view of the dielectric substrate.
  • the coupling capacitance of the first antenna element and the second antenna element is the coupling capacitance of the first antenna element and the second antenna element.
  • this antenna device can relax the characteristics of the high-pass filter, and can realize suitable antenna performance even for radio waves having a low frequency (for example, a frequency of 2 GHz or less).
  • the present antenna device can further increase the coupling capacitance between the first antenna element and the second antenna element, and can improve the antenna performance for low frequency radio waves.
  • the first antenna element and the second antenna element are arranged on different surfaces of the dielectric substrate. Therefore, the installation area of the antenna element can be reduced as compared with the antenna device in which the first antenna element and the second antenna element run side by side on the same surface. That is, in this antenna device, it is easy to miniaturize the antenna device.
  • the first antenna element may be a monopole antenna having a length of 1/4 of the wavelength of the radio wave of the first frequency
  • the second antenna element may be 1/4 of the wavelength of the radio wave of the second frequency. It may be a monopole antenna having a length of 4.
  • the distance between the other end of the second antenna element and the feeding portion is preferably as close as possible, and the distance is, for example, 2 mm or less.
  • This antenna device may have the following features.
  • the first antenna element and the second antenna element have a bent portion. By having the first antenna element and the second antenna element bent, the antenna device can be further miniaturized.
  • the second antenna element is formed shorter than the first antenna element. That is, the second antenna element is an antenna element that operates at a higher frequency than the first antenna element.
  • the first frequency in which the first antenna element operates is, for example, 2 GHz
  • the second frequency in which the second antenna element operates is, for example, 2.5 GHz.
  • This antenna device may have the following features.
  • a plan view of the dielectric substrate at least a part thereof is provided on the other surface so as to overlap the first antenna element, one end is electrically connected to the grounding portion, and the other end is more than the grounding portion.
  • It further includes a plate-shaped third antenna element that exists near the power feeding unit and operates on radio waves of the third frequency.
  • the third antenna element can also have a large coupling capacitance between the first antenna element and the third antenna element.
  • the third antenna element may be a monopole antenna having a length of 1/4 of the wavelength of the radio wave of the third frequency.
  • the third frequency is, for example, 3.5 GHz.
  • the first antenna element is provided on one surface so that at least a part of the first antenna element runs side by side, one end is electrically connected to a grounding portion provided on the other surface, and the other end is the first antenna element.
  • a plate-shaped fourth antenna element that extends toward one end of the antenna and operates on a radio wave of a fourth frequency is further provided.
  • the grounding portion electrically connected to the fourth antenna element may be a grounding portion to which the second antenna element is connected, or may be another grounding portion. At least a part of the fourth antenna element runs in parallel with the first antenna element. Further, the other end of the fourth antenna element extends toward one end of the first antenna element where a strong current is generated in the first antenna element.
  • the fourth antenna element may be a monopole antenna having a length of 1/4 of the wavelength of the radio wave of the fourth frequency.
  • the fourth frequency is, for example, 5 GHz.
  • the disclosed technology may be a wireless communication device including the above antenna device.
  • Examples of the wireless communication device include smartphones, feature phones, tablet computers, notebook computers, wearable computers and the like.
  • FIG. 1 is a diagram showing an example of an antenna device according to an embodiment.
  • the antenna device 1 illustrated in FIG. 1 includes an LDS substrate 100, a first antenna 10, and a second antenna 20.
  • the antenna device 1 is provided on, for example, the ground substrate 200.
  • a portion that cannot be seen from the surface 110 side is shown by a dotted line.
  • the + Z direction is also referred to as an upward direction
  • the ⁇ Z direction is also referred to as a downward direction.
  • the antenna device 1 is an example of an “antenna device”.
  • the LDS substrate 100 is formed of, for example, a resin for LDS.
  • the resin for LDS is, for example, a dielectric.
  • the LDS substrate 100 illustrated in FIG. 1 is a rectangular parallelepiped in which the front surface 110 and the back surface 120 are formed in a square shape.
  • the front surface 110 and the back surface 120 are the bottom surfaces of the LDS substrate 110.
  • the front surface 110 and the back surface 120 are each 12 mm in length and width, and the area thereof is 144 mm 2.
  • the LDS substrate 100 is provided on the ground substrate 200 with the back surface 120 facing the ground substrate 200.
  • the front surface 110 and the back surface 120 are formed in a square shape, but the front surface 110 and the back surface 120 may be formed in a shape other than the square shape.
  • the LDS substrate 100 is an example of a “dielectric substrate”.
  • the surface 110 is an example of "one surface”.
  • the back surface 120 is an example of the “other surface”.
  • the first antenna 10 is a monopole antenna that operates on radio waves of the first frequency (for example, 2 GHz).
  • the first antenna 10 is formed in a thin plate shape by LDS. That is, the first antenna 10 is formed wider on the upper surface and the lower surface than on the side surface.
  • the first antenna 10 is provided on the surface 110 of the LDS substrate 100.
  • One end 11 of the first antenna 10 is electrically connected to the power feeding unit 13 provided on the back surface 120 via the via 130 provided on the LDS substrate 100.
  • the other end 12 of the first antenna 10 is a region in the first antenna 10 where a weak current exists because the electrical distance from the feeding unit 13 is the longest.
  • the first antenna 10 has a limited antenna length (for example, 1/4 of the wavelength of the first frequency radio wave) suitable for operation with the first frequency radio wave on the surface 110 of the LDS substrate 100. It is bent between one end 11 and the other end 12 so that it can be secured within the area. However, the first antenna 10 does not have to be bent as long as an antenna length suitable for operation with radio waves of the first frequency can be secured.
  • the first antenna 10 is an example of the “first antenna element”.
  • the power feeding unit 13 is an example of a “power feeding unit”.
  • the second antenna 20 is a non-feeding monopole antenna that operates on radio waves of the second frequency (for example, 2.5 GHz).
  • the second antenna 20 is formed in a thin plate shape by LDS. That is, the upper surface and the lower surface of the second antenna 20 are formed wider than the side surface.
  • the second antenna 20 is provided on the back surface 120 of the LDS substrate 100.
  • One end 21 of the second antenna 20 is electrically connected to the grounding portion 23 provided on the back surface 120 of the LDS board 100.
  • the other end 22 of the second antenna 20 is arranged at a position closer to the feeding portion 13 than the grounding portion 23. That is, the other end 22 of the second antenna 20, which is a region where a weak current exists, is arranged near the feeding portion 13 which is a region where a strong current exists.
  • the grounding portion 23 is an example of a “grounding portion”.
  • the length of the second antenna 20 is formed shorter than the length of the first antenna 10.
  • the second antenna 20 has a limited antenna length (for example, 1/4 of the wavelength of the second frequency radio wave) suitable for operation with the second frequency radio wave on the back surface 120 of the LDS substrate 100. It is bent between one end 21 and the other end 22 so that it can be secured within the area. However, the second antenna 20 does not have to be bent as long as an antenna length suitable for operation with radio waves of the second frequency can be secured.
  • the distance (interval) between the other end 22 of the second antenna 20 and the feeding portion 13 is as narrow as possible without contacting each other.
  • the distance (interval) between the other end 22 of the second antenna 20 and the feeding portion 13 is, for example, 2 mm or less when the first frequency is 1 GHz and 1 mm or less when the first frequency is 2 GHz. When the first frequency is 4 GHz, it is preferably 0.5 mm or less.
  • the second antenna 20 is an example of the “second antenna element”.
  • the ground board 200 is provided with a feeding point and a ground terminal.
  • the first antenna 10 is fed by electrically connecting the feeding unit 13 to the feeding point of the ground board 200.
  • the ground terminal of the ground board 200 is a grounded terminal.
  • the second antenna 20 is grounded by electrically connecting the grounding portion 23 to the grounding terminal of the ground board 200.
  • FIG. 2 is a plan view of the antenna device according to the embodiment from the + Z direction.
  • the region R1 in which the first antenna 10 and the second antenna 20 overlap in a plan view is shown by diagonal lines.
  • the ground board 200 is not shown.
  • the second antenna 20 is arranged so that at least a part thereof overlaps with the first antenna 10 in a plan view. It is preferable that the second antenna 20 is arranged so as to overlap the first antenna 10 as much as possible.
  • FIG. 3 is a diagram showing an example of an antenna device according to a comparative example.
  • the first antenna 810 and the second antenna 820 formed by the LDS are provided substantially in parallel on the same plane of the LDS substrate 830.
  • the first antenna 810 and the second antenna 820 provided in this way are capacitively coupled between the side surfaces of each other.
  • the first antenna 810 and the second antenna 820 are monopole antennas formed in a thin plate shape by LDS.
  • One end 811 of the first antenna 810 is electrically connected to a feeding point (not shown), and the other end 812 extends in a direction away from the feeding point.
  • One end 821 of the second antenna 820 is grounded in the vicinity of the feeding point, and the other end 822 extends in a direction away from the feeding point.
  • the capacitance coupling of the first antenna 810 and the second antenna 820 is performed on the side surfaces of each other.
  • the area of the side surface is extremely narrow as compared with the area of the upper surface and the lower surface. Therefore, in the antenna device 800 according to the comparative example, the coupling capacitance of the first antenna 810 and the second antenna 820 is, for example, 0.003 pF.
  • the antenna device 800 having such a small coupling capacitance the characteristics of the high-pass filter become remarkable. As a result, in the antenna device 800, the antenna performance tends to deteriorate at a frequency of 2 GHz or less.
  • the capacitance coupling between the first antenna 10 and the second antenna 20 is performed on the lower surface of the first antenna 10 and the upper surface of the second antenna 20.
  • the areas of the upper surface and the lower surface are extremely large as compared with the side surfaces. Therefore, in the antenna device 1 according to the embodiment, the coupling capacitance between the first antenna 10 and the second antenna 20 is, for example, 0.095 pF.
  • the coupling capacitance between the first antenna 10 and the second antenna 20 is larger than the coupling capacitance between the first antenna 810 and the second antenna 820 of the antenna device 800 according to the comparative example. can do.
  • the antenna device 1 according to the embodiment can relax the characteristics of the high-pass filter as compared with the antenna device 800 according to the comparative example, and by extension, the antenna performance suitable for radio waves having a frequency of 2 GHz or less. Can be realized.
  • the other end 22 of the second antenna 20 is arranged near the feeding portion 13.
  • the antenna device 1 according to the embodiment can further increase the coupling capacitance of the first antenna 10 and the second antenna 20 due to such a feature, and by extension, the antenna performance for radio waves having a frequency of 2 GHz or less is related to a comparative example. It can be improved more than the antenna device 800.
  • the first antenna 10 and the second antenna 20 are arranged on different surfaces of the LDS substrate 100, respectively. Therefore, the installation area of the antenna can be reduced as compared with the antenna device 800 according to the comparative example in which the first antenna 810 and the second antenna 820 are arranged on the same surface. That is, the antenna device 1 according to the embodiment is easier to miniaturize than the antenna device 800 according to the comparative example.
  • the antenna device 1 includes two monopole antennas, a first antenna 10 and a second antenna 20.
  • an antenna device including three monopole antennas will be described.
  • FIG. 4 is a diagram showing an example of the antenna device according to the first modification.
  • the antenna device 1a illustrated in FIG. 4 is different from the antenna device 1 according to the embodiment in that the third antenna 30 is further provided.
  • a portion that cannot be seen from the surface 110 side is shown by a dotted line.
  • the third antenna 30 is a non-feeding monopole antenna that operates on radio waves of a third frequency (for example, 3.5 GHz). Like the first antenna 10 and the second antenna 20, the third antenna 30 is formed in a thin plate shape by the LDS. That is, the upper surface and the lower surface of the third antenna 30 are formed wider than the side surface. The third antenna 30 is provided on the back surface 120 of the LDS substrate 100.
  • One end 31 of the third antenna 30 is electrically connected to the grounding portion 23.
  • the third antenna 30 extends in the direction opposite to that of the second antenna 20 with the grounding portion 23 interposed therebetween, and the other end 32 of the third antenna 30 is arranged closer to the feeding portion 13 than the grounding portion 23. That is, the other end 32, which is a region where a weak current exists in the third antenna 30, is arranged near the feeding portion 13 which is a region where a strong current exists.
  • the distance (interval) between the other end 32 of the third antenna 30 and the feeding portion 13 is as narrow as possible within a range in which they do not come into contact with each other.
  • the distance (interval) between the other end 32 of the third antenna 30 and the feeding portion 13 is, for example, 2 mm or less when the first frequency is 1 GHz and 1 mm or less when the first frequency is 2 GHz.
  • the first frequency is 4 GHz, it is preferably 0.5 mm or less.
  • the length of the third antenna 30 is formed shorter than the length of the second antenna 20.
  • the third antenna 30 has a limited antenna length (for example, 1/4 of the wavelength of the radio wave of the third frequency) suitable for operation with the radio wave of the third frequency on the back surface 120 of the LDS substrate 100. It is bent between one end 31 and the other end 32 so that it can be secured within the area. However, the third antenna 30 does not have to be bent as long as an antenna length suitable for operation with radio waves of the third frequency can be secured.
  • the third antenna 30 is an example of the “third antenna element”.
  • FIG. 5 is a plan view of the antenna device according to the first modification from the + Z direction.
  • the region R1 in which the first antenna 10 and the second antenna 20 overlap in the plan view is shown by an oblique line, and the region R2 in which the first antenna 10 and the third antenna 30 overlap in the plan view is indicated by dots. Shown in a pattern.
  • the illustration of the ground substrate 200 is omitted.
  • the third antenna 30 is arranged so that at least a part thereof overlaps with the first antenna 10 in a plan view. It is preferable that the third antenna 30 is arranged so as to overlap the first antenna 10 as much as possible. By arranging in this way, in the antenna device 1a, the lower surface of the first antenna 10 and the upper surface of the third antenna 30 can be capacitively coupled.
  • the second antenna 20 when the second frequency for operating the second antenna 20 is higher than the first frequency for operating the first antenna 10, the second antenna 20 is shorter than the first antenna 10. In such a case, even if the first antenna 10 and the second antenna 20 are arranged so as to overlap as much as possible in a plan view, there is a portion of the first antenna 10 that does not overlap with the second antenna 20. It will be easier. Therefore, when the second frequency is higher than the first frequency, it is easy to arrange the third antenna 30 so as to overlap the first antenna 10 in a plan view.
  • FIG. 6 is a diagram showing an example of the antenna device according to the second modification. In FIG. 6, a portion that cannot be seen from the surface 110 side is shown by a dotted line.
  • the antenna device 1b illustrated in FIG. 6 is different from the antenna device 1a according to the first modification in that the fourth antenna 40 is further provided.
  • the fourth antenna 40 is a non-feeding monopole antenna that operates on radio waves of the fourth frequency (for example, 5 GHz).
  • the fourth antenna 40 is formed in a thin plate shape by the LDS, like the first antenna 10, the second antenna 20, and the third antenna 30. That is, the upper surface and the lower surface of the fourth antenna 40 are formed wider than the side surface.
  • the fourth antenna 40 is provided on the surface 110 of the LDS substrate 100.
  • the fourth antenna 40 is provided, for example, so that at least a part thereof runs in parallel with the first antenna 10 in the region where the bending first antenna 10 is partitioned on the surface 110.
  • One end 41 of the fourth antenna 40 is electrically connected to the grounding portion 33 provided on the back surface 120 via the via 140 provided on the LDS substrate 100.
  • the fourth antenna 40 is grounded by electrically connecting the grounding portion 33 to the grounding terminal provided on the ground board 200.
  • the other end 42 of the fourth antenna 40 is arranged closer to the other end 11 than the other end 12 of the first antenna 10. In other words, the other end 42 of the fourth antenna 40 extends toward one end 11 of the first antenna 10 as close as possible. That is, the other end 42, which is a region where the current is small in the fourth antenna 40, is arranged near the one end 11 which is a region where a strong current exists in the first antenna 10.
  • one end 41 of the fourth antenna 40 is connected to a grounding portion 33 different from the grounding portion 23, but one end 41 may be connected to the grounding portion 23.
  • the distance (distance) between the other end 42 of the fourth antenna 40 and the one end 11 of the first antenna 10 is as narrow as possible without contacting each other.
  • the distance (interval) between the other end 42 of the fourth antenna 40 and the one end 11 of the first antenna 10 is, for example, 2 mm or less when the first frequency is 1 GHz and 2 GHz when the first frequency is 2 GHz. Is preferably 1 mm or less, and preferably 0.5 mm or less when the first frequency is 4 GHz.
  • the length of the fourth antenna 40 is formed shorter than the length of the third antenna 30.
  • the fourth antenna 40 has a limited antenna length (for example, 1/4 of the wavelength of the fourth frequency radio wave) suitable for operation on the fourth frequency radio wave on the surface 110 of the LDS substrate 100. It is bent between one end 41 and the other end 42 so that it can be secured within the area. However, the fourth antenna 40 does not have to be bent as long as an antenna length suitable for operation with radio waves of the fourth frequency can be secured.
  • the fourth antenna 40 is provided on the same surface as the first antenna 10, so that the lower surface of the first antenna 10 and the upper surface of the fourth antenna 40 are capacitively coupled. It's difficult. Therefore, in the fourth antenna 40, the first antenna 10 and the fourth antenna 40 are capacitively coupled by running at least a part of the fourth antenna 40 in parallel with the first antenna 10. In order to strengthen the capacitive coupling, it is preferable to run the fourth antenna 40 in parallel with the first antenna 10 for as long as possible. Further, it is preferable that the portion of the fourth antenna 40 that runs in parallel with the first antenna 10 is as close as possible to the first antenna 10. By arranging in this way, the coupling capacitance generated between the side surface of the fourth antenna 40 and the side surface of the first antenna 10 can be made as large as possible.
  • the fourth antenna 40 is an example of the “fourth antenna element”.
  • the embodiments and modifications disclosed above can be combined with each other. Further, the antenna device according to the embodiment or modification disclosed above can be mounted on the wireless communication device.

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Abstract

Provided are an antenna device which can be operated for multiple frequencies and allows simple miniaturisation, and a wireless communication device comprising said antenna device. This antenna device comprises: a dielectric substrate; a planar first antenna element which operates with waves of a first frequency and is provided on one surface of the dielectric substrate, one end of said first antenna element being electrically connected to a power supply unit provided on the other surface of the dielectric substrate; and a planar second antenna element which operates with waves of a second frequency, is provided on the other surface so as to at least partly overlap the first antenna element in a plan view of the dielectric substrate, one end of said second antenna element being electrically connected to a grounding unit provided on said other surface, the other end being positioned closer to the power supply unit than the grounding unit.

Description

アンテナ装置および無線通信装置Antenna device and wireless communication device
　本発明は、アンテナ装置および無線通信装置に関する。 The present invention relates to an antenna device and a wireless communication device.
　スマートフォン、タブレット型コンピュータ、車載用アンテナを備えた車両等の無線通信装置は、例えば高速通信を実現するために、複数の周波数帯を用いた通信を行っている。そのため、無線通信装置には、複数の周波数帯に対応するアンテナ装置が搭載されている。 Wireless communication devices such as smartphones, tablet computers, and vehicles equipped with in-vehicle antennas perform communication using a plurality of frequency bands in order to realize high-speed communication, for example. Therefore, the wireless communication device is equipped with an antenna device corresponding to a plurality of frequency bands.
　例えば、特許文献１では、第１のアンテナエレメントの水平部を上側に第２のアンテナエレメントの水平部を下側に重ねて配置し、第１のアンテナエレメントと第２のアンテナエレメントの給電点を共通にすることでデュアルバンドに対応する内蔵アンテナが開示されている。特許文献２では、複数の逆Ｆアンテナを備えることで複数の周波数に対応するアンテナ装置が開示されている。 For example, in Patent Document 1, the horizontal portion of the first antenna element is arranged on the upper side and the horizontal portion of the second antenna element is arranged on the lower side, and the feeding points of the first antenna element and the second antenna element are arranged. A built-in antenna that supports dual bands by making it common is disclosed. Patent Document 2 discloses an antenna device corresponding to a plurality of frequencies by providing a plurality of inverted F antennas.
特開２００５－２６９３０１号公報Japanese Unexamined Patent Publication No. 2005-269301 特表２００６－５２４９４０号公報Special Table 2006-524940
　近年では、複数のアンテナ素子を同一平面上に併走させたアンテナ装置も利用されている。アンテナ素子は、例えば、Ｌａｓｅｒ　Ｄｉｒｅｃｔ　Ｓｔｒｕｃｔｕｒｉｎｇ（ＬＤＳ）等によって薄く形成される。同一平面上に併走する複数のアンテナ素子は、互いの側面で容量結合することになるため、容量結合によって生じる結合容量（静電容量）はアンテナ素子の厚みに依存する。アンテナ素子は薄く形成されるため、結合容量は小さくなりやすい。このようなアンテナ装置は、小さい結合容量によってハイパスフィルタ（ＨＰＦ）の特性が顕著になり、低い周波数（例えば、２ＧＨｚ以下）における性能が低下する問題があった。また、複数のアンテナ素子を同一平面上に併走させるとアンテナ装置の面積が増大するため、アンテナ装置や当該アンテナ装置を実装する無線通信装置の小型化にも好ましい設計ではなかった。 In recent years, an antenna device in which a plurality of antenna elements are run side by side on the same plane has also been used. The antenna element is thinly formed by, for example, Laser Direct Structuring (LDS) or the like. Since a plurality of antenna elements running side by side on the same plane are capacitively coupled on each side, the coupling capacitance (capacitance) generated by the capacitive coupling depends on the thickness of the antenna element. Since the antenna element is formed thin, the coupling capacitance tends to be small. Such an antenna device has a problem that the characteristics of the high-pass filter (HPF) become remarkable due to the small coupling capacitance, and the performance at a low frequency (for example, 2 GHz or less) deteriorates. Further, since the area of the antenna device increases when a plurality of antenna elements are run side by side on the same plane, the design is not preferable for the miniaturization of the antenna device and the wireless communication device on which the antenna device is mounted.
　開示の技術の１つの側面は、複数の周波数に対して動作可能であるとともに小型化が容易なアンテナ装置および当該アンテナ装置を備えた無線通信装置を提供することを目的とする。 One aspect of the disclosed technology is to provide an antenna device that can operate on a plurality of frequencies and is easily miniaturized, and a wireless communication device provided with the antenna device.
　開示の技術の１つの側面は、次のようなアンテナ装置によって例示される。本アンテナ装置は、誘電体基板と、前記誘電体基板の一方の面に設けられ、一端が前記誘電体基板の他方の面に設けられた給電部と電気的に接続され、第１周波数の電波で動作する板状の第１アンテナ素子と、前記誘電体基板の平面視において少なくとも一部が前記第１アンテナ素子と重なるように前記他方の面に設けられ、一端が前記他方の面に設けられた接地部と電気的に接続されるとともに他端が前記接地部よりも前記給電部に近い位置に存在し、第２周波数の電波で動作する板状の第２アンテナ素子と、を備える。 One aspect of the disclosed technology is illustrated by the following antenna devices. This antenna device is electrically connected to a dielectric substrate and a feeding portion provided on one surface of the dielectric substrate and one end of which is provided on the other surface of the dielectric substrate, and is a first frequency radio wave. The plate-shaped first antenna element operating in the above and the other surface are provided so that at least a part thereof overlaps with the first antenna element in the plan view of the dielectric substrate, and one end thereof is provided on the other surface. It is provided with a plate-shaped second antenna element that is electrically connected to the grounding portion and has the other end located closer to the feeding portion than the grounding portion and operates with a second frequency radio wave.
　開示の技術は、複数の周波数に対して動作可能であるとともに小型化が容易である。 The disclosed technology is capable of operating on multiple frequencies and is easy to miniaturize.
図１は、実施形態に係るアンテナ装置の一例を示す図である。FIG. 1 is a diagram showing an example of an antenna device according to an embodiment. 図２は、実施形態に係るアンテナ装置を＋Ｚ方向から平面視した図である。FIG. 2 is a plan view of the antenna device according to the embodiment from the + Z direction. 図３は、比較例に係るアンテナ装置の一例を示す図である。FIG. 3 is a diagram showing an example of an antenna device according to a comparative example. 図４は、第１変形例に係るアンテナ装置の一例を示す図である。FIG. 4 is a diagram showing an example of the antenna device according to the first modification. 図５は、第１変形例に係るアンテナ装置を＋Ｚ方向から平面視した図である。FIG. 5 is a plan view of the antenna device according to the first modification from the + Z direction. 図６は、第２変形例に係るアンテナ装置の一例を示す図である。FIG. 6 is a diagram showing an example of the antenna device according to the second modification.
　以下、実施形態について説明する。以下に示す実施形態の構成は例示であり、開示の技術は実施形態の構成に限定されない。実施形態に係るアンテナ装置は、
　誘電体基板と、
　前記誘電体基板の一方の面に設けられ、一端が前記誘電体基板の他方の面に設けられた給電部と電気的に接続され、第１周波数の電波で動作する板状の第１アンテナ素子と、
　前記誘電体基板の平面視において少なくとも一部が前記第１アンテナ素子と重なるように前記他方の面に設けられ、一端が前記他方の面に設けられた接地部と電気的に接続されるとともに他端が前記接地部よりも前記給電部に近い位置に存在し、第２周波数の電波で動作する板状の第２アンテナ素子と、を備える。 Hereinafter, embodiments will be described. The configurations of the embodiments shown below are examples, and the disclosed technology is not limited to the configurations of the embodiments. The antenna device according to the embodiment is
Dielectric substrate and
A plate-shaped first antenna element provided on one surface of the dielectric substrate, one end of which is electrically connected to a feeding portion provided on the other surface of the dielectric substrate, and operates with radio waves of the first frequency. When,
In a plan view of the dielectric substrate, at least a part thereof is provided on the other surface so as to overlap the first antenna element, and one end thereof is electrically connected to a grounding portion provided on the other surface and the other. A plate-shaped second antenna element whose end is located closer to the feeding portion than the grounding portion and operates on a radio wave of a second frequency is provided.
　本アンテナ装置は、例えば、誘電体基板の他方の面をグランド基板に向けて設置される。給電部は、例えば、グランド基板に設けられた給電点と電気的に接続されることで第１アンテナ素子への給電を行う。接地部は、例えば、グランド基板に設けられた接地端子と電気的に接続されることで、第２アンテナ素子を接地する。 This antenna device is installed, for example, with the other surface of the dielectric substrate facing the ground substrate. The power feeding unit supplies power to the first antenna element by being electrically connected to, for example, a feeding point provided on the ground board. The grounding portion grounds the second antenna element by being electrically connected to, for example, a grounding terminal provided on the ground board.
　本アンテナ装置は、誘電体基板の平面視において、板状の第２アンテナ素子の少なくとも一部が板状の第１アンテナ素子と重なるように配置される。本アンテナ装置は、第１アンテナ素子の下面と第２アンテナ素子の上面とを容量結合させることができるため、第１アンテナ素子と第２アンテナ素子の結合容量を第１アンテナ素子と第２アンテナ素子とが同一平面上に併走される場合よりも大きくすることができる。そのため、本アンテナ装置は、ハイパスフィルタの特性を緩和することができ、ひいては、低い周波数（例えば、周波数２ＧＨｚ以下）の電波に対しても好適なアンテナ性能を実現することができる。 This antenna device is arranged so that at least a part of the plate-shaped second antenna element overlaps with the plate-shaped first antenna element in the plan view of the dielectric substrate. In this antenna device, since the lower surface of the first antenna element and the upper surface of the second antenna element can be capacitively coupled, the coupling capacitance of the first antenna element and the second antenna element is the coupling capacitance of the first antenna element and the second antenna element. Can be made larger than when and are run side by side on the same plane. Therefore, this antenna device can relax the characteristics of the high-pass filter, and can realize suitable antenna performance even for radio waves having a low frequency (for example, a frequency of 2 GHz or less).
　さらに、本アンテナ装置は、第２アンテナ素子の他端が給電部の近くに配置される。本アンテナ装置は、このような特徴により、第１アンテナ素子と第２アンテナ素子の結合容量をさらに大きくすることができ、ひいては、低い周波数の電波に対するアンテナ性能を向上させることができる。 Further, in this antenna device, the other end of the second antenna element is arranged near the feeding portion. Due to such a feature, the present antenna device can further increase the coupling capacitance between the first antenna element and the second antenna element, and can improve the antenna performance for low frequency radio waves.
　また、本アンテナ装置では、第１アンテナ素子と第２アンテナ素子とを誘電体基板の異なる面にそれぞれ配置する。そのため、第１アンテナ素子と第２アンテナ素子とを同一面上に併走させるアンテナ装置よりも、アンテナ素子の設置面積を縮小することができる。すなわち、本アンテナ装置は、アンテナ装置の小型化が容易である。 Further, in this antenna device, the first antenna element and the second antenna element are arranged on different surfaces of the dielectric substrate. Therefore, the installation area of the antenna element can be reduced as compared with the antenna device in which the first antenna element and the second antenna element run side by side on the same surface. That is, in this antenna device, it is easy to miniaturize the antenna device.
　ここで、第１アンテナ素子は、第１周波数の電波の波長の１／４の長さを有するモノポールアンテナであってもよく、第２アンテナ素子は、第２周波数の電波の波長の１／４の長さを有するモノポールアンテナであってもよい。また、前記第２アンテナ素子の他端と前記給電部との距離は、可及的に近いことが好ましく、その距離は、例えば、２ｍｍ以下である。 Here, the first antenna element may be a monopole antenna having a length of 1/4 of the wavelength of the radio wave of the first frequency, and the second antenna element may be 1/4 of the wavelength of the radio wave of the second frequency. It may be a monopole antenna having a length of 4. Further, the distance between the other end of the second antenna element and the feeding portion is preferably as close as possible, and the distance is, for example, 2 mm or less.
　本アンテナ装置は、次の特徴を有してもよい。前記第１アンテナ素子および前記第２アンテナ素子は、屈曲する部分を有する。第１アンテナ素子および第２アンテナ素子が屈曲する部分を有することで、アンテナ装置をより小型化することができる。 This antenna device may have the following features. The first antenna element and the second antenna element have a bent portion. By having the first antenna element and the second antenna element bent, the antenna device can be further miniaturized.
　本アンテナ装置は、次の特徴を有してもよい。前記第２アンテナ素子は前記第１アンテナ素子よりも短く形成される。すなわち、第２アンテナ素子は、第１アンテナ素子よりも高い周波数で動作するアンテナ素子である。第１アンテナ素子が動作する第１周波数は、例えば、２ＧＨｚであり、第２アンテナ素子が動作する第２周波数は、例えば、２．５ＧＨｚである。このような特徴を有することで、誘電体基板の平面視において第１アンテナ素子と少なくとも一部が重なるようなアンテナ素子の追加が容易になる。 This antenna device may have the following features. The second antenna element is formed shorter than the first antenna element. That is, the second antenna element is an antenna element that operates at a higher frequency than the first antenna element. The first frequency in which the first antenna element operates is, for example, 2 GHz, and the second frequency in which the second antenna element operates is, for example, 2.5 GHz. By having such a feature, it becomes easy to add an antenna element such that at least a part of the first antenna element overlaps with the first antenna element in the plan view of the dielectric substrate.
　本アンテナ装置は、次の特徴を有してもよい。前記誘電体基板の平面視において少なくとも一部が前記第１アンテナ素子と重なるように前記他方の面に設けられ、一端が前記接地部と電気的に接続され、他端が前記接地部よりも前記給電部に近い位置に存在し、第３周波数の電波で動作する板状の第３アンテナ素子をさらに備える。第３アンテナ素子も、第２アンテナ素子と同様に、第１アンテナ素子と第３アンテナ素子との結合容量を大きいものとすることができる。ここで、前記第３アンテナ素子は、前記第３周波数の電波の波長の１／４の長さを有するモノポールアンテナであってもよい。第３周波数は、例えば、３．５ＧＨｚである。 This antenna device may have the following features. In a plan view of the dielectric substrate, at least a part thereof is provided on the other surface so as to overlap the first antenna element, one end is electrically connected to the grounding portion, and the other end is more than the grounding portion. It further includes a plate-shaped third antenna element that exists near the power feeding unit and operates on radio waves of the third frequency. Like the second antenna element, the third antenna element can also have a large coupling capacitance between the first antenna element and the third antenna element. Here, the third antenna element may be a monopole antenna having a length of 1/4 of the wavelength of the radio wave of the third frequency. The third frequency is, for example, 3.5 GHz.
　本アンテナ装置は、次の特徴を有してもよい。前記第１アンテナ素子と少なくとも一部が併走するように前記一方の面に設けられ、一端が前記他方の面に設けられた接地部と電気的に接続されるとともに他端が前記第１アンテナ素子の一端に向けて延び、第４周波数の電波で動作する板状の第４アンテナ素子をさらに備える。第４アンテナ素子と電気的に接続される接地部は、第２アンテナ素子が接続される接地部であってもよいし、他の接地部であってもよい。第４アンテナ素子は、少なくとも一部が第１アンテナ素子と併走する。また、第４アンテナ素子の他端は、第１アンテナ素子において強い電流が生じる第１アンテナ素子の一端に向けて延びる。そのため、第１アンテナ素子と第４アンテナ素子の結合容量を大きいものとすることができる。ここで、第４アンテナ素子は、第４周波数の電波の波長の１／４の長さを有するモノポールアンテナであってもよい。ここで、第４周波数は、例えば、５ＧＨｚである。 This antenna device may have the following features. The first antenna element is provided on one surface so that at least a part of the first antenna element runs side by side, one end is electrically connected to a grounding portion provided on the other surface, and the other end is the first antenna element. A plate-shaped fourth antenna element that extends toward one end of the antenna and operates on a radio wave of a fourth frequency is further provided. The grounding portion electrically connected to the fourth antenna element may be a grounding portion to which the second antenna element is connected, or may be another grounding portion. At least a part of the fourth antenna element runs in parallel with the first antenna element. Further, the other end of the fourth antenna element extends toward one end of the first antenna element where a strong current is generated in the first antenna element. Therefore, the coupling capacitance between the first antenna element and the fourth antenna element can be increased. Here, the fourth antenna element may be a monopole antenna having a length of 1/4 of the wavelength of the radio wave of the fourth frequency. Here, the fourth frequency is, for example, 5 GHz.
　開示の技術は、上記アンテナ装置を備える無線通信装置であってもよい。無線通信装置としては、例えば、スマートフォン、フィーチャーフォン、タブレット型コンピュータ、ノートブック型コンピュータ、ウェアラブルコンピュータ等を挙げることができる。 The disclosed technology may be a wireless communication device including the above antenna device. Examples of the wireless communication device include smartphones, feature phones, tablet computers, notebook computers, wearable computers and the like.
　＜実施形態＞
　以下、図面を参照して、実施形態についてさらに説明する。図１は、実施形態に係るアンテナ装置の一例を示す図である。図１に例示されるアンテナ装置１は、ＬＤＳ基板１００、第１アンテナ１０および第２アンテナ２０を含む。アンテナ装置１は、例えば、グランド基板２００上に設けられる。図１において、表面１１０側から見えない部分については点線で図示している。以下、本明細書において、＋Ｚ方向を上方向とも称し、－Ｚ方向を下方向とも称する。アンテナ装置１は、「アンテナ装置」の一例である。 <Embodiment>
Hereinafter, embodiments will be further described with reference to the drawings. FIG. 1 is a diagram showing an example of an antenna device according to an embodiment. The antenna device 1 illustrated in FIG. 1 includes an LDS substrate 100, a first antenna 10, and a second antenna 20. The antenna device 1 is provided on, for example, the ground substrate 200. In FIG. 1, a portion that cannot be seen from the surface 110 side is shown by a dotted line. Hereinafter, in the present specification, the + Z direction is also referred to as an upward direction, and the −Z direction is also referred to as a downward direction. The antenna device 1 is an example of an “antenna device”.
　ＬＤＳ基板１００は、例えば、ＬＤＳ用の樹脂で形成される。ＬＤＳ用の樹脂は、例えば、誘電体である。図１に例示されるＬＤＳ基板１００は、表面１１０および裏面１２０が正方形に形成された直方体となっている。表面１１０および裏面１２０は、ＬＤＳ基板１１０の底面である。図１に例示されるＬＤＳ基板１００では、表面１１０および裏面１２０の縦横はそれぞれ１２ｍｍであり、その面積は１４４ｍｍ２となっている。ＬＤＳ基板１００は、裏面１２０をグランド基板２００に向けて、グランド基板２００上に設けられる。なお、図１に例示されるＬＤＳ基板１００では表面１１０および裏面１２０は正方形に形成されているが、表面１１０および裏面１２０は正方形以外の形状に形成されてもよい。ＬＤＳ基板１００は、「誘電体基板」の一例である。表面１１０は、「一方の面」の一例である。裏面１２０は、「他方の面」の一例である。 The LDS substrate 100 is formed of, for example, a resin for LDS. The resin for LDS is, for example, a dielectric. The LDS substrate 100 illustrated in FIG. 1 is a rectangular parallelepiped in which the front surface 110 and the back surface 120 are formed in a square shape. The front surface 110 and the back surface 120 are the bottom surfaces of the LDS substrate 110. In the LDS substrate 100 illustrated in FIG. 1, the front surface 110 and the back surface 120 are each 12 mm in length and width, and the area thereof is 144 mm 2. The LDS substrate 100 is provided on the ground substrate 200 with the back surface 120 facing the ground substrate 200. In the LDS substrate 100 illustrated in FIG. 1, the front surface 110 and the back surface 120 are formed in a square shape, but the front surface 110 and the back surface 120 may be formed in a shape other than the square shape. The LDS substrate 100 is an example of a “dielectric substrate”. The surface 110 is an example of "one surface". The back surface 120 is an example of the “other surface”.
　第１アンテナ１０は、第１周波数（例えば、２ＧＨｚ）の電波で動作するモノポールアンテナである。第１アンテナ１０は、ＬＤＳによって薄い板状に形成される。すなわち、第１アンテナ１０は、側面よりも上面および下面の方が広く形成される。第１アンテナ１０は、ＬＤＳ基板１００の表面１１０に設けられる。 The first antenna 10 is a monopole antenna that operates on radio waves of the first frequency (for example, 2 GHz). The first antenna 10 is formed in a thin plate shape by LDS. That is, the first antenna 10 is formed wider on the upper surface and the lower surface than on the side surface. The first antenna 10 is provided on the surface 110 of the LDS substrate 100.
　第１アンテナ１０の一端１１は、ＬＤＳ基板１００に設けられたビア１３０を介して裏面１２０に設けられた給電部１３と電気的に接続される。第１アンテナ１０の他端１２は、第１アンテナ１０において、給電部１３からの電気的な距離が最も遠いことから弱い電流が存在する領域となる。図１では、第１アンテナ１０は、第１周波数の電波での動作に好適なアンテナ長（例えば、第１周波数の電波の波長の１／４）をＬＤＳ基板１００の表面１１０上の限られた面積内で確保できるように一端１１と他端１２との間で屈曲させている。しかしながら、第１周波数の電波での動作に好適なアンテナ長を確保できるのであれば、第１アンテナ１０は屈曲しなくともよい。第１アンテナ１０は、「第１アンテナ素子」の一例である。給電部１３は、「給電部」の一例である。 One end 11 of the first antenna 10 is electrically connected to the power feeding unit 13 provided on the back surface 120 via the via 130 provided on the LDS substrate 100. The other end 12 of the first antenna 10 is a region in the first antenna 10 where a weak current exists because the electrical distance from the feeding unit 13 is the longest. In FIG. 1, the first antenna 10 has a limited antenna length (for example, 1/4 of the wavelength of the first frequency radio wave) suitable for operation with the first frequency radio wave on the surface 110 of the LDS substrate 100. It is bent between one end 11 and the other end 12 so that it can be secured within the area. However, the first antenna 10 does not have to be bent as long as an antenna length suitable for operation with radio waves of the first frequency can be secured. The first antenna 10 is an example of the “first antenna element”. The power feeding unit 13 is an example of a “power feeding unit”.
　第２アンテナ２０は、第２周波数（例えば、２．５ＧＨｚ）の電波で動作する無給電のモノポールアンテナである。第２アンテナ２０は、ＬＤＳによって薄い板状に形成される。すなわち、第２アンテナ２０は、側面よりも上面および下面の方が広く形成される。第２アンテナ２０は、ＬＤＳ基板１００の裏面１２０に設けられる。 The second antenna 20 is a non-feeding monopole antenna that operates on radio waves of the second frequency (for example, 2.5 GHz). The second antenna 20 is formed in a thin plate shape by LDS. That is, the upper surface and the lower surface of the second antenna 20 are formed wider than the side surface. The second antenna 20 is provided on the back surface 120 of the LDS substrate 100.
　第２アンテナ２０の一端２１は、ＬＤＳ基板１００の裏面１２０に設けられた接地部２３と電気的に接続される。第２アンテナ２０の他端２２は、接地部２３よりも給電部１３に近い位置に配置される。すなわち、第２アンテナ２０において弱い電流が存在する領域となる他端２２が、強い電流が存在する領域となる給電部１３の近くに配置される。接地部２３は、「接地部」の一例である。 One end 21 of the second antenna 20 is electrically connected to the grounding portion 23 provided on the back surface 120 of the LDS board 100. The other end 22 of the second antenna 20 is arranged at a position closer to the feeding portion 13 than the grounding portion 23. That is, the other end 22 of the second antenna 20, which is a region where a weak current exists, is arranged near the feeding portion 13 which is a region where a strong current exists. The grounding portion 23 is an example of a “grounding portion”.
　第２アンテナ２０が動作する第２周波数は第１アンテナ１０が動作する第１周波数よりも高いため、第２アンテナ２０の長さは第１アンテナ１０の長さよりも短く形成される。図１では、第２アンテナ２０は、第２周波数の電波での動作に好適なアンテナ長（例えば、第２周波数の電波の波長の１／４）をＬＤＳ基板１００の裏面１２０上の限られた面積内で確保できるように一端２１と他端２２との間で屈曲させている。しかしながら、第２周波数の電波での動作に好適なアンテナ長を確保できるのであれば、第２アンテナ２０は屈曲しなくともよい。 Since the second frequency in which the second antenna 20 operates is higher than the first frequency in which the first antenna 10 operates, the length of the second antenna 20 is formed shorter than the length of the first antenna 10. In FIG. 1, the second antenna 20 has a limited antenna length (for example, 1/4 of the wavelength of the second frequency radio wave) suitable for operation with the second frequency radio wave on the back surface 120 of the LDS substrate 100. It is bent between one end 21 and the other end 22 so that it can be secured within the area. However, the second antenna 20 does not have to be bent as long as an antenna length suitable for operation with radio waves of the second frequency can be secured.
　第２アンテナ２０の他端２２と給電部１３との間の距離（間隔）は、互いに接触しない範囲で可及的に狭いことが好ましい。第２アンテナ２０の他端２２と給電部１３との間の距離（間隔）は、例えば、第１周波数が１ＧＨｚである場合には２ｍｍ以下、第１周波数が２ＧＨｚである場合には１ｍｍ以下、第１周波数が４ＧＨｚである場合には０．５ｍｍ以下であることが好ましい。第２アンテナ２０は、「第２アンテナ素子」の一例である。 It is preferable that the distance (interval) between the other end 22 of the second antenna 20 and the feeding portion 13 is as narrow as possible without contacting each other. The distance (interval) between the other end 22 of the second antenna 20 and the feeding portion 13 is, for example, 2 mm or less when the first frequency is 1 GHz and 1 mm or less when the first frequency is 2 GHz. When the first frequency is 4 GHz, it is preferably 0.5 mm or less. The second antenna 20 is an example of the “second antenna element”.
　グランド基板２００には、給電点と接地端子とが設けられる。給電部１３がグランド基板２００の給電点と電気的に接続されることで、第１アンテナ１０が給電される。グランド基板２００の接地端子は、接地された端子である。接地部２３がグランド基板２００の接地端子と電気的に接続されることで、第２アンテナ２０が接地される。 The ground board 200 is provided with a feeding point and a ground terminal. The first antenna 10 is fed by electrically connecting the feeding unit 13 to the feeding point of the ground board 200. The ground terminal of the ground board 200 is a grounded terminal. The second antenna 20 is grounded by electrically connecting the grounding portion 23 to the grounding terminal of the ground board 200.
　図２は、実施形態に係るアンテナ装置を＋Ｚ方向から平面視した図である。図２では、平面視において第１アンテナ１０と第２アンテナ２０とが重なっている領域Ｒ１を斜線で示している。なお、図２では、グランド基板２００の図示は省略している。図２の領域Ｒ１が例示するように、第２アンテナ２０は、平面視において少なくとも一部が第１アンテナ１０と重なるように配置される。第２アンテナ２０は、可及的に第１アンテナ１０と重なるように配置されることが好ましい。このように配置されることで、アンテナ装置１では、板状に形成された第１アンテナ１０の下面と板状に形成された第２アンテナ２０の上面とで容量結合させることができる。 FIG. 2 is a plan view of the antenna device according to the embodiment from the + Z direction. In FIG. 2, the region R1 in which the first antenna 10 and the second antenna 20 overlap in a plan view is shown by diagonal lines. In FIG. 2, the ground board 200 is not shown. As the region R1 of FIG. 2 illustrates, the second antenna 20 is arranged so that at least a part thereof overlaps with the first antenna 10 in a plan view. It is preferable that the second antenna 20 is arranged so as to overlap the first antenna 10 as much as possible. By arranging in this way, in the antenna device 1, the lower surface of the plate-shaped first antenna 10 and the upper surface of the plate-shaped second antenna 20 can be capacitively coupled.
　＜比較例＞
　図３は、比較例に係るアンテナ装置の一例を示す図である。比較例に係るアンテナ装置８００は、ＬＤＳによって形成される第１アンテナ８１０および第２アンテナ８２０がＬＤＳ基板８３０の同一面状において略平行に設けられる。このように設けられた第１アンテナ８１０と第２アンテナ８２０とは、互いの側面間で容量結合される。 <Comparison example>
FIG. 3 is a diagram showing an example of an antenna device according to a comparative example. In the antenna device 800 according to the comparative example, the first antenna 810 and the second antenna 820 formed by the LDS are provided substantially in parallel on the same plane of the LDS substrate 830. The first antenna 810 and the second antenna 820 provided in this way are capacitively coupled between the side surfaces of each other.
　第１アンテナ８１０および第２アンテナ８２０は、ＬＤＳによって薄い板状に形成されるモノポールアンテナである。第１アンテナ８１０の一端８１１は給電点（図示を省略）と電気的に接続され、他端８１２は給電点から離れる方向に向けて延びている。第２アンテナ８２０の一端８２１は給電点の近傍において接地され、他端８２２は給電点から離れる方向に向けて延びている。 The first antenna 810 and the second antenna 820 are monopole antennas formed in a thin plate shape by LDS. One end 811 of the first antenna 810 is electrically connected to a feeding point (not shown), and the other end 812 extends in a direction away from the feeding point. One end 821 of the second antenna 820 is grounded in the vicinity of the feeding point, and the other end 822 extends in a direction away from the feeding point.
　＜実施形態と比較例との比較＞
　比較例に係るアンテナ装置８００では、第１アンテナ８１０と第２アンテナ８２０の容量結合は、互いの側面で行われる。薄い板状に形成された第１アンテナ８１０と第２アンテナ８２０では、側面の面積は上面や下面の面積と比較して極めて狭くなる。そのため、比較例に係るアンテナ装置８００では、第１アンテナ８１０と第２アンテナ８２０の結合容量は、例えば、０．００３ｐＦとなる。このように結合容量が小さいアンテナ装置８００ではハイパスフィルタの特性が顕著となる。その結果、アンテナ装置８００では、２ＧＨｚ以下の周波数においてアンテナ性能が低下しやすい。 <Comparison between Embodiment and Comparative Example>
In the antenna device 800 according to the comparative example, the capacitance coupling of the first antenna 810 and the second antenna 820 is performed on the side surfaces of each other. In the first antenna 810 and the second antenna 820 formed in a thin plate shape, the area of the side surface is extremely narrow as compared with the area of the upper surface and the lower surface. Therefore, in the antenna device 800 according to the comparative example, the coupling capacitance of the first antenna 810 and the second antenna 820 is, for example, 0.003 pF. In the antenna device 800 having such a small coupling capacitance, the characteristics of the high-pass filter become remarkable. As a result, in the antenna device 800, the antenna performance tends to deteriorate at a frequency of 2 GHz or less.
　一方、実施形態に係るアンテナ装置１では、第１アンテナ１０と第２アンテナ２０の容量結合は、第１アンテナ１０の下面と第２アンテナ２０の上面とで行われる。第１アンテナ１０および第２アンテナ２０において、上面や下面の面積は、側面と比較して極めて大きくなる。そのため、実施形態に係るアンテナ装置１では、第１アンテナ１０と第２アンテナ２０との結合容量が、例えば、０．０９５ｐＦとなる。このように、実施形態に係るアンテナ装置１では、第１アンテナ１０と第２アンテナ２０との結合容量を比較例に係るアンテナ装置８００の第１アンテナ８１０と第２アンテナ８２０の結合容量よりも大きくすることができる。このような特徴により、実施形態に係るアンテナ装置１は、比較例に係るアンテナ装置８００よりもハイパスフィルタの特性を緩和することができ、ひいては、周波数２ＧＨｚ以下の電波に対しても好適なアンテナ性能を実現することができる。 On the other hand, in the antenna device 1 according to the embodiment, the capacitance coupling between the first antenna 10 and the second antenna 20 is performed on the lower surface of the first antenna 10 and the upper surface of the second antenna 20. In the first antenna 10 and the second antenna 20, the areas of the upper surface and the lower surface are extremely large as compared with the side surfaces. Therefore, in the antenna device 1 according to the embodiment, the coupling capacitance between the first antenna 10 and the second antenna 20 is, for example, 0.095 pF. As described above, in the antenna device 1 according to the embodiment, the coupling capacitance between the first antenna 10 and the second antenna 20 is larger than the coupling capacitance between the first antenna 810 and the second antenna 820 of the antenna device 800 according to the comparative example. can do. Due to such characteristics, the antenna device 1 according to the embodiment can relax the characteristics of the high-pass filter as compared with the antenna device 800 according to the comparative example, and by extension, the antenna performance suitable for radio waves having a frequency of 2 GHz or less. Can be realized.
　さらに、実施形態に係るアンテナ装置１では、比較例に係るアンテナ装置８００とは異なり、第２アンテナ２０の他端２２が給電部１３の近くに配置される。実施形態に係るアンテナ装置１は、このような特徴により、第１アンテナ１０と第２アンテナ２０の結合容量をさらに大きくすることができ、ひいては、周波数２ＧＨｚ以下の電波に対するアンテナ性能を比較例に係るアンテナ装置８００よりも向上させることができる。 Further, in the antenna device 1 according to the embodiment, unlike the antenna device 800 according to the comparative example, the other end 22 of the second antenna 20 is arranged near the feeding portion 13. The antenna device 1 according to the embodiment can further increase the coupling capacitance of the first antenna 10 and the second antenna 20 due to such a feature, and by extension, the antenna performance for radio waves having a frequency of 2 GHz or less is related to a comparative example. It can be improved more than the antenna device 800.
　また、実施形態に係るアンテナ装置１では、第１アンテナ１０と第２アンテナ２０とをＬＤＳ基板１００の異なる面にそれぞれ配置する。そのため、第１アンテナ８１０と第２アンテナ８２０とを同一面上に配置する比較例に係るアンテナ装置８００よりも、アンテナの設置面積を縮小することができる。すなわち、実施形態に係るアンテナ装置１は、比較例に係るアンテナ装置８００よりも、アンテナ装置の小型化が容易である。 Further, in the antenna device 1 according to the embodiment, the first antenna 10 and the second antenna 20 are arranged on different surfaces of the LDS substrate 100, respectively. Therefore, the installation area of the antenna can be reduced as compared with the antenna device 800 according to the comparative example in which the first antenna 810 and the second antenna 820 are arranged on the same surface. That is, the antenna device 1 according to the embodiment is easier to miniaturize than the antenna device 800 according to the comparative example.
　＜第１変形例＞
　実施形態に係るアンテナ装置１は、第１アンテナ１０と第２アンテナ２０の２つのモノポールアンテナを備える。第１変形例では、３つのモノポールアンテナを備えるアンテナ装置について説明する。 <First modification>
The antenna device 1 according to the embodiment includes two monopole antennas, a first antenna 10 and a second antenna 20. In the first modification, an antenna device including three monopole antennas will be described.
　図４は、第１変形例に係るアンテナ装置の一例を示す図である。図４に例示されるアンテナ装置１ａは、第３アンテナ３０をさらに備える点で、実施形態に係るアンテナ装置１とは異なる。図４において、表面１１０側から見えない部分については点線で図示している。 FIG. 4 is a diagram showing an example of the antenna device according to the first modification. The antenna device 1a illustrated in FIG. 4 is different from the antenna device 1 according to the embodiment in that the third antenna 30 is further provided. In FIG. 4, a portion that cannot be seen from the surface 110 side is shown by a dotted line.
　第３アンテナ３０は、第３周波数（例えば、３．５ＧＨｚ）の電波で動作する無給電のモノポールアンテナである。第３アンテナ３０は、第１アンテナ１０および第２アンテナ２０と同様に、ＬＤＳによって薄い板状に形成される。すなわち、第３アンテナ３０は、側面よりも上面および下面の方が広く形成される。第３アンテナ３０は、ＬＤＳ基板１００の裏面１２０に設けられる。 The third antenna 30 is a non-feeding monopole antenna that operates on radio waves of a third frequency (for example, 3.5 GHz). Like the first antenna 10 and the second antenna 20, the third antenna 30 is formed in a thin plate shape by the LDS. That is, the upper surface and the lower surface of the third antenna 30 are formed wider than the side surface. The third antenna 30 is provided on the back surface 120 of the LDS substrate 100.
　第３アンテナ３０の一端３１は、接地部２３と電気的に接続される。第３アンテナ３０は、接地部２３を挟んで第２アンテナ２０とは逆方向に延びるとともに、第３アンテナ３０の他端３２は接地部２３よりも給電部１３の近い位置に配置される。すなわち、第３アンテナ３０において弱い電流が存在する領域となる他端３２が、強い電流が存在する領域となる給電部１３の近くに配置される。 One end 31 of the third antenna 30 is electrically connected to the grounding portion 23. The third antenna 30 extends in the direction opposite to that of the second antenna 20 with the grounding portion 23 interposed therebetween, and the other end 32 of the third antenna 30 is arranged closer to the feeding portion 13 than the grounding portion 23. That is, the other end 32, which is a region where a weak current exists in the third antenna 30, is arranged near the feeding portion 13 which is a region where a strong current exists.
　第３アンテナ３０の他端３２と給電部１３との間の距離（間隔）は、互いに接触しない範囲で可及的に狭いことが好ましい。第３アンテナ３０の他端３２と給電部１３との間の距離（間隔）は、例えば、第１周波数が１ＧＨｚである場合には２ｍｍ以下、第１周波数が２ＧＨｚである場合には１ｍｍ以下、第１周波数が４ＧＨｚである場合には０．５ｍｍ以下であることが好ましい。 It is preferable that the distance (interval) between the other end 32 of the third antenna 30 and the feeding portion 13 is as narrow as possible within a range in which they do not come into contact with each other. The distance (interval) between the other end 32 of the third antenna 30 and the feeding portion 13 is, for example, 2 mm or less when the first frequency is 1 GHz and 1 mm or less when the first frequency is 2 GHz. When the first frequency is 4 GHz, it is preferably 0.5 mm or less.
　第３アンテナ３０が動作する第３周波数は第２アンテナ２０が動作する第２周波数よりも高いため、第３アンテナ３０の長さは第２アンテナ２０の長さよりも短く形成される。図４では、第３アンテナ３０は、第３周波数の電波での動作に好適なアンテナ長（例えば、第３周波数の電波の波長の１／４）をＬＤＳ基板１００の裏面１２０上の限られた面積内で確保できるように一端３１と他端３２との間で屈曲させている。しかしながら、第３周波数の電波での動作に好適なアンテナ長を確保できるのであれば、第３アンテナ３０は屈曲しなくともよい。第３アンテナ３０は、「第３アンテナ素子」の一例である。 Since the third frequency in which the third antenna 30 operates is higher than the second frequency in which the second antenna 20 operates, the length of the third antenna 30 is formed shorter than the length of the second antenna 20. In FIG. 4, the third antenna 30 has a limited antenna length (for example, 1/4 of the wavelength of the radio wave of the third frequency) suitable for operation with the radio wave of the third frequency on the back surface 120 of the LDS substrate 100. It is bent between one end 31 and the other end 32 so that it can be secured within the area. However, the third antenna 30 does not have to be bent as long as an antenna length suitable for operation with radio waves of the third frequency can be secured. The third antenna 30 is an example of the “third antenna element”.
　図５は、第１変形例に係るアンテナ装置を＋Ｚ方向から平面視した図である。図５では、平面視において第１アンテナ１０と第２アンテナ２０とが重なっている領域Ｒ１を斜線で示し、平面視において第１アンテナ１０と第３アンテナ３０とが重なっている領域Ｒ２をドットのパターンで示す。また、図５では、グランド基板２００の図示は省略している。図５の領域Ｒ２に例示されるように、第３アンテナ３０は、平面視において少なくとも一部が第１アンテナ１０と重なるように配置される。第３アンテナ３０は、可及的に第１アンテナ１０と重なるように配置されることが好ましい。このように配置されることで、アンテナ装置１ａでは、さらに、第１アンテナ１０の下面と第３アンテナ３０の上面とで容量結合させることができる。 FIG. 5 is a plan view of the antenna device according to the first modification from the + Z direction. In FIG. 5, the region R1 in which the first antenna 10 and the second antenna 20 overlap in the plan view is shown by an oblique line, and the region R2 in which the first antenna 10 and the third antenna 30 overlap in the plan view is indicated by dots. Shown in a pattern. Further, in FIG. 5, the illustration of the ground substrate 200 is omitted. As illustrated in the region R2 of FIG. 5, the third antenna 30 is arranged so that at least a part thereof overlaps with the first antenna 10 in a plan view. It is preferable that the third antenna 30 is arranged so as to overlap the first antenna 10 as much as possible. By arranging in this way, in the antenna device 1a, the lower surface of the first antenna 10 and the upper surface of the third antenna 30 can be capacitively coupled.
　例えば、第１アンテナ１０を動作させる第１周波数よりも第２アンテナ２０を動作させる第２周波数の方が高い周波数である場合には、第１アンテナ１０よりも第２アンテナ２０が短くなる。このような場合には、平面視において第１アンテナ１０と第２アンテナ２０とを可及的に重なるように配置しても、第１アンテナ１０において第２アンテナ２０と重なっていない部分が存在しやすくなる。そのため、第１周波数よりも第２周波数の方が高い周波数である場合には、平面視において第３アンテナ３０を第１アンテナ１０とを重なるように配置することが容易である。 For example, when the second frequency for operating the second antenna 20 is higher than the first frequency for operating the first antenna 10, the second antenna 20 is shorter than the first antenna 10. In such a case, even if the first antenna 10 and the second antenna 20 are arranged so as to overlap as much as possible in a plan view, there is a portion of the first antenna 10 that does not overlap with the second antenna 20. It will be easier. Therefore, when the second frequency is higher than the first frequency, it is easy to arrange the third antenna 30 so as to overlap the first antenna 10 in a plan view.
　＜第２変形例＞
　第２変形例では、第１変形例に係るアンテナ装置１ａに対して、さらに、モノポールアンテナを追加した構成について説明する。図６は、第２変形例に係るアンテナ装置の一例を示す図である。図６において、表面１１０側から見えない部分については点線で図示している。図６に例示されるアンテナ装置１ｂは、第４アンテナ４０をさらに備える点で、第１変形例に係るアンテナ装置１ａとは異なる。 <Second modification>
In the second modification, a configuration in which a monopole antenna is further added to the antenna device 1a according to the first modification will be described. FIG. 6 is a diagram showing an example of the antenna device according to the second modification. In FIG. 6, a portion that cannot be seen from the surface 110 side is shown by a dotted line. The antenna device 1b illustrated in FIG. 6 is different from the antenna device 1a according to the first modification in that the fourth antenna 40 is further provided.
　第４アンテナ４０は、第４周波数（例えば、５ＧＨｚ）の電波で動作する無給電のモノポールアンテナである。第４アンテナ４０は、第１アンテナ１０、第２アンテナ２０および第３アンテナ３０と同様に、ＬＤＳによって薄い板状に形成される。すなわち、第４アンテナ４０は、側面よりも上面および下面の方が広く形成される。第４アンテナ４０は、ＬＤＳ基板１００の表面１１０に設けられる。第４アンテナ４０は、例えば、屈曲する第１アンテナ１０が表面１１０上に区画する領域内に、少なくとも一部が第１アンテナ１０と併走するように設けられる。 The fourth antenna 40 is a non-feeding monopole antenna that operates on radio waves of the fourth frequency (for example, 5 GHz). The fourth antenna 40 is formed in a thin plate shape by the LDS, like the first antenna 10, the second antenna 20, and the third antenna 30. That is, the upper surface and the lower surface of the fourth antenna 40 are formed wider than the side surface. The fourth antenna 40 is provided on the surface 110 of the LDS substrate 100. The fourth antenna 40 is provided, for example, so that at least a part thereof runs in parallel with the first antenna 10 in the region where the bending first antenna 10 is partitioned on the surface 110.
　第４アンテナ４０の一端４１は、ＬＤＳ基板１００に設けられたビア１４０を介して裏面１２０に設けられた接地部３３と電気的に接続される。接地部３３がグランド基板２００に設けられた接地端子と電気的に接続されることで、第４アンテナ４０は接地される。第４アンテナ４０の他端４２は、第１アンテナ１０の他端１２よりも一端１１の近い位置に配置される。換言すれば、第４アンテナ４０の他端４２は第１アンテナ１０の一端１１に向けて可及的に近づくように延びる。すなわち、第４アンテナ４０において電流が小さい領域となる他端４２が、第１アンテナ１０において強い電流が存在する領域となる一端１１の近くに配置される。なお、図６では、第４アンテナ４０の一端４１は接地部２３とは異なる接地部３３に接続されているが、一端４１は接地部２３に接続されてもよい。 One end 41 of the fourth antenna 40 is electrically connected to the grounding portion 33 provided on the back surface 120 via the via 140 provided on the LDS substrate 100. The fourth antenna 40 is grounded by electrically connecting the grounding portion 33 to the grounding terminal provided on the ground board 200. The other end 42 of the fourth antenna 40 is arranged closer to the other end 11 than the other end 12 of the first antenna 10. In other words, the other end 42 of the fourth antenna 40 extends toward one end 11 of the first antenna 10 as close as possible. That is, the other end 42, which is a region where the current is small in the fourth antenna 40, is arranged near the one end 11 which is a region where a strong current exists in the first antenna 10. In FIG. 6, one end 41 of the fourth antenna 40 is connected to a grounding portion 33 different from the grounding portion 23, but one end 41 may be connected to the grounding portion 23.
　第４アンテナ４０の他端４２と第１アンテナ１０の一端１１との間の距離（間隔）は、互いに接触しない範囲で可及的に狭いことが好ましい。第４アンテナ４０の他端４２と第１アンテナ１０の一端１１との間の距離（間隔）は、例えば、第１周波数が１ＧＨｚである場合には２ｍｍ以下、第１周波数が２ＧＨｚである場合には１ｍｍ以下、第１周波数が４ＧＨｚである場合には０．５ｍｍ以下であることが好ましい。 It is preferable that the distance (distance) between the other end 42 of the fourth antenna 40 and the one end 11 of the first antenna 10 is as narrow as possible without contacting each other. The distance (interval) between the other end 42 of the fourth antenna 40 and the one end 11 of the first antenna 10 is, for example, 2 mm or less when the first frequency is 1 GHz and 2 GHz when the first frequency is 2 GHz. Is preferably 1 mm or less, and preferably 0.5 mm or less when the first frequency is 4 GHz.
　第４アンテナ４０が動作する第４周波数は第３アンテナ３０が動作する第３周波数よりも高いため、第４アンテナ４０の長さは第３アンテナ３０の長さよりも短く形成される。図６では、第４アンテナ４０は、第４周波数の電波での動作に好適なアンテナ長（例えば、第４周波数の電波の波長の１／４）をＬＤＳ基板１００の表面１１０上の限られた面積内で確保できるように一端４１と他端４２との間で屈曲させている。しかしながら、第４周波数の電波での動作に好適なアンテナ長を確保できるのであれば、第４アンテナ４０は屈曲しなくともよい。 Since the fourth frequency in which the fourth antenna 40 operates is higher than the third frequency in which the third antenna 30 operates, the length of the fourth antenna 40 is formed shorter than the length of the third antenna 30. In FIG. 6, the fourth antenna 40 has a limited antenna length (for example, 1/4 of the wavelength of the fourth frequency radio wave) suitable for operation on the fourth frequency radio wave on the surface 110 of the LDS substrate 100. It is bent between one end 41 and the other end 42 so that it can be secured within the area. However, the fourth antenna 40 does not have to be bent as long as an antenna length suitable for operation with radio waves of the fourth frequency can be secured.
　第４アンテナ４０は、第２アンテナ２０や第３アンテナ３０とは異なり、第１アンテナ１０と同一面上に設けられるため、第１アンテナ１０の下面と第４アンテナ４０の上面とで容量結合させることは難しい。そこで、第４アンテナ４０では、少なくとも一部を第１アンテナ１０に併走させることで、第１アンテナ１０と第４アンテナ４０とを容量結合させる。容量結合を強くするためには、第４アンテナ４０を可及的に長く第１アンテナ１０と併走させることが好ましい。さらに、第４アンテナ４０において第１アンテナ１０と併走する部分は、可及的に第１アンテナ１０と近づけることが好ましい。このように配置することで、第４アンテナ４０の側面と第１アンテナ１０の側面との間で生じる結合容量を可及的に大きなものとすることができる。第４アンテナ４０は、「第４アンテナ素子」の一例である。 Unlike the second antenna 20 and the third antenna 30, the fourth antenna 40 is provided on the same surface as the first antenna 10, so that the lower surface of the first antenna 10 and the upper surface of the fourth antenna 40 are capacitively coupled. It's difficult. Therefore, in the fourth antenna 40, the first antenna 10 and the fourth antenna 40 are capacitively coupled by running at least a part of the fourth antenna 40 in parallel with the first antenna 10. In order to strengthen the capacitive coupling, it is preferable to run the fourth antenna 40 in parallel with the first antenna 10 for as long as possible. Further, it is preferable that the portion of the fourth antenna 40 that runs in parallel with the first antenna 10 is as close as possible to the first antenna 10. By arranging in this way, the coupling capacitance generated between the side surface of the fourth antenna 40 and the side surface of the first antenna 10 can be made as large as possible. The fourth antenna 40 is an example of the “fourth antenna element”.
　以上で開示した実施形態や変形例はそれぞれ組み合わせることができる。また、以上で開示した実施形態や変形例に係るアンテナ装置を無線通信装置に実装させることもできる。 The embodiments and modifications disclosed above can be combined with each other. Further, the antenna device according to the embodiment or modification disclosed above can be mounted on the wireless communication device.
　１、１ａ、１ｂ、８００・・・アンテナ装置
　１０、８１０・・・第１アンテナ
　１１、２１、３１、４１、８１１、８２１・・・一端
　１２、２２、３２、４２、８１２、８２２・・・他端
　１３・・・給電部
　２０、８２０・・・第２アンテナ
　２３・・・接地部
　３０・・・第３アンテナ
　４０・・・第４アンテナ
　１００・・・ＬＤＳ基板
　１１０・・・表面
　１２０・・・裏面
　１３０・・・ビア
　２００・・・グランド基板 1, 1a, 1b, 800 ... Antenna device 10,810 ... First antenna 11, 21, 31, 41, 811, 821 ... One end 12, 22, 32, 42, 812, 822 ... The other end 13 ... Feeding part 20, 820 ... 2nd antenna 23 ... Grounding part 30 ... 3rd antenna 40 ... 4th antenna 100 ... LDS board 110 ... Surface 120 ...・ ・ Back side 130 ・ ・ ・ Via 200 ・ ・ ・ Ground board

Claims (10)

  1. 　誘電体基板と、
    　前記誘電体基板の一方の面に設けられ、一端が前記誘電体基板の他方の面に設けられた給電部と電気的に接続され、第１周波数の電波で動作する板状の第１アンテナ素子と、
    　前記誘電体基板の平面視において少なくとも一部が前記第１アンテナ素子と重なるように前記他方の面に設けられ、一端が前記他方の面に設けられた接地部と電気的に接続されるとともに他端が前記接地部よりも前記給電部に近い位置に存在し、第２周波数の電波で動作する板状の第２アンテナ素子と、を備える、
    　アンテナ装置。     Dielectric substrate and
    A plate-shaped first antenna element provided on one surface of the dielectric substrate, one end of which is electrically connected to a feeding portion provided on the other surface of the dielectric substrate, and operates with radio waves of the first frequency. When,
    In a plan view of the dielectric substrate, at least a part thereof is provided on the other surface so as to overlap the first antenna element, and one end thereof is electrically connected to a grounding portion provided on the other surface and the other. A plate-shaped second antenna element having an end located closer to the feeding portion than the grounding portion and operating with a radio wave of a second frequency is provided.
    Antenna device.
  2. 　前記第１アンテナ素子は、前記第１周波数の電波の波長の１／４の長さを有するモノポールアンテナであり、
    　前記第２アンテナ素子は、前記第２周波数の電波の波長の１／４の長さを有するモノポールアンテナである、
    　請求項１に記載のアンテナ装置。     The first antenna element is a monopole antenna having a length of 1/4 of the wavelength of the radio wave of the first frequency.
    The second antenna element is a monopole antenna having a length of 1/4 of the wavelength of the radio wave of the second frequency.
    The antenna device according to claim 1.
  3. 　前記第２アンテナ素子の他端と前記給電部との距離は２ｍｍ以下である、
    　請求項１または２に記載のアンテナ装置。     The distance between the other end of the second antenna element and the feeding portion is 2 mm or less.
    The antenna device according to claim 1 or 2.
  4. 　前記第１アンテナ素子および前記第２アンテナ素子は、屈曲する部分を有する、
    　請求項１から３のいずれか一項に記載のアンテナ装置。     The first antenna element and the second antenna element have a bent portion.
    The antenna device according to any one of claims 1 to 3.
  5. 　前記第２アンテナ素子は前記第１アンテナ素子よりも短く形成される、
    　請求項１から４のいずれか一項に記載のアンテナ装置。     The second antenna element is formed shorter than the first antenna element.
    The antenna device according to any one of claims 1 to 4.
  6. 　前記誘電体基板の平面視において少なくとも一部が前記第１アンテナ素子と重なるように前記他方の面に設けられ、一端が前記接地部と電気的に接続され、他端が前記接地部よりも前記給電部に近い位置に存在し、第３周波数の電波で動作する板状の第３アンテナ素子をさらに備える、
    　請求項１から５のいずれか一項に記載のアンテナ装置。     In a plan view of the dielectric substrate, at least a part thereof is provided on the other surface so as to overlap the first antenna element, one end is electrically connected to the grounding portion, and the other end is more than the grounding portion. It further includes a plate-shaped third antenna element that exists near the power feeding unit and operates on radio waves of the third frequency.
    The antenna device according to any one of claims 1 to 5.
  7. 　前記第３アンテナ素子は、前記第３周波数の電波の波長の１／４の長さを有するモノポールアンテナである、
    　請求項６に記載のアンテナ装置。     The third antenna element is a monopole antenna having a length of 1/4 of the wavelength of the radio wave of the third frequency.
    The antenna device according to claim 6.
  8. 　前記第１アンテナ素子と少なくとも一部が併走するように前記一方の面に設けられ、一端が前記他方の面に設けられた接地部と電気的に接続されるとともに他端が前記第１アンテナ素子の一端に向けて延び、第４周波数の電波で動作する板状の第４アンテナ素子をさらに備える、
    　請求項１から７のいずれか一項に記載のアンテナ装置。     The first antenna element is provided on one surface so that at least a part of the first antenna element runs side by side, one end is electrically connected to a grounding portion provided on the other surface, and the other end is the first antenna element. It further includes a plate-shaped fourth antenna element that extends toward one end of the antenna and operates on radio waves of the fourth frequency.
    The antenna device according to any one of claims 1 to 7.
  9. 　前記第４アンテナ素子は、前記第４周波数の電波の波長の１／４の長さを有するモノポールアンテナである、
    　請求項８に記載のアンテナ装置。     The fourth antenna element is a monopole antenna having a length of 1/4 of the wavelength of the radio wave of the fourth frequency.
    The antenna device according to claim 8.
  10. 　請求項１から９のいずれか一項に記載のアンテナ装置を備える、
    　無線通信装置。     The antenna device according to any one of claims 1 to 9 is provided.
    Wireless communication device.
PCT/JP2019/041501 2019-10-23 2019-10-23 Antenna device and wireless communication device WO2021079430A1 (en)

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Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2004201278A (en) * 2002-12-06 2004-07-15 Sharp Corp Pattern antenna
US20080258979A1 (en) * 2007-04-23 2008-10-23 National Taiwan University Antenna
US20150288074A1 (en) * 2012-10-24 2015-10-08 Microsoft Corporation Sar reduction in radio transmitting devices

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2004201278A (en) * 2002-12-06 2004-07-15 Sharp Corp Pattern antenna
US20080258979A1 (en) * 2007-04-23 2008-10-23 National Taiwan University Antenna
US20150288074A1 (en) * 2012-10-24 2015-10-08 Microsoft Corporation Sar reduction in radio transmitting devices

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