WO2021079430A1 - アンテナ装置および無線通信装置 - Google Patents

アンテナ装置および無線通信装置 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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WIPO (PCT)
Prior art keywords
antenna
antenna element
frequency
antenna device
dielectric substrate
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/JP2019/041501
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English (en)
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
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Fujitsu Connected Technologies Ltd
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Fujitsu Connected Technologies Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Fujitsu Connected Technologies Ltd filed Critical Fujitsu Connected Technologies Ltd
Priority to JP2021553204A priority Critical patent/JP7405862B2/ja
Priority to PCT/JP2019/041501 priority patent/WO2021079430A1/ja
Publication of WO2021079430A1 publication Critical patent/WO2021079430A1/ja
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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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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PCT/JP2019/041501 2019-10-23 2019-10-23 アンテナ装置および無線通信装置 Ceased WO2021079430A1 (ja)

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JP2021553204A JP7405862B2 (ja) 2019-10-23 2019-10-23 アンテナ装置および無線通信装置
PCT/JP2019/041501 WO2021079430A1 (ja) 2019-10-23 2019-10-23 アンテナ装置および無線通信装置

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Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2004201278A (ja) * 2002-12-06 2004-07-15 Sharp Corp パターンアンテナ
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 (ja) * 2002-12-06 2004-07-15 Sharp Corp パターンアンテナ
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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