WO2021085483A1 - Mimo antenna device - Google Patents

Mimo antenna device Download PDF

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Publication number
WO2021085483A1
WO2021085483A1 PCT/JP2020/040465 JP2020040465W WO2021085483A1 WO 2021085483 A1 WO2021085483 A1 WO 2021085483A1 JP 2020040465 W JP2020040465 W JP 2020040465W WO 2021085483 A1 WO2021085483 A1 WO 2021085483A1
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WO
WIPO (PCT)
Prior art keywords
antenna
dipole antenna
mimo
dipole
antenna device
Prior art date
Application number
PCT/JP2020/040465
Other languages
French (fr)
Japanese (ja)
Inventor
龍治 小林
良平 長谷川
Original Assignee
原田工業株式会社
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
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Publication of WO2021085483A1 publication Critical patent/WO2021085483A1/en

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q1/00—Details of, or arrangements associated with, antennas
    • H01Q1/52—Means for reducing coupling between antennas; Means for reducing coupling between an antenna and another structure
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q21/00—Antenna arrays or systems
    • H01Q21/24—Combinations of antenna units polarised in different directions for transmitting or receiving circularly and elliptically polarised waves or waves linearly polarised in any direction
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q21/00—Antenna arrays or systems
    • H01Q21/28—Combinations of substantially independent non-interacting antenna units or systems
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • 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
    • H01Q9/16—Resonant antennas with feed intermediate between the extremities of the antenna, e.g. centre-fed dipole
    • 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
    • H01Q9/16—Resonant antennas with feed intermediate between the extremities of the antenna, e.g. centre-fed dipole
    • H01Q9/26—Resonant antennas with feed intermediate between the extremities of the antenna, e.g. centre-fed dipole with folded element or elements, the folded parts being spaced apart a small fraction of operating wavelength
    • 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
    • H01Q9/16—Resonant antennas with feed intermediate between the extremities of the antenna, e.g. centre-fed dipole
    • H01Q9/28—Conical, cylindrical, cage, strip, gauze, or like elements having an extended radiating surface; Elements comprising two conical surfaces having collinear axes and adjacent apices and fed by two-conductor transmission lines
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/0413—MIMO systems

Definitions

  • the present invention relates to a MIMO antenna device, and more particularly to a small and wide band MIMO antenna device.
  • MIMO Multiple Input Multiple Output
  • a MIMO antenna device using a plurality of antenna elements there are many design restrictions such that it is generally necessary to secure isolation by installing the antenna elements apart from each other.
  • the space for mounting an antenna inside an automobile has tended to be restricted by other devices such as an airbag, and it has been difficult to reduce the size to a size that can be mounted inside the vehicle.
  • Patent Document 1 discloses a multi-band antenna device using a plurality of antenna elements in a plurality of frequency bands.
  • Patent Document 1 has a structure in which a high-frequency band antenna is inserted into the same space as the low-frequency band antenna installation space while minimizing the influence of interference between antenna elements.
  • Patent Document 2 is a cross-dipole antenna formed on a sheet-shaped dielectric in order to cope with circularly polarized waves.
  • the balanced feeders for feeding the cross dipole antennas adjacent to each other without any gap. Therefore, by arranging one antenna element of the first dipole antenna and one antenna element of the second dipole antenna on the back surface side of the dielectric, the balanced feeder lines are aligned vertically when viewed from the side. It is possible to arrange it.
  • Patent Document 1 the antenna device of Patent Document 1 was used for a base station and a repeater, and was not conscious of miniaturization such as being mounted on a vehicle. In addition, the influence of interference between antenna elements in a wide band when miniaturized is not considered at all.
  • the antenna device of Patent Document 2 is one that corresponds to circularly polarized waves by using a cross dipole antenna, and cannot be used as a MIMO antenna device. Nor was it intended to suppress the effects of interference between the first dipole antenna and the second dipole antenna. Further, there are many design restrictions due to the difference in the arrangement position of the antenna element of the dipole antenna and the structure of the balanced feeder, and it is difficult to reduce the size.
  • the present invention is intended to provide a MIMO antenna device capable of suppressing interference between antennas in a wide band and being miniaturized.
  • the MIMO antenna device includes a first dipole antenna composed of a pair of first elements connected to a first feeding unit and arranged on a first surface, and a second dipole antenna.
  • a second dipole antenna composed of a pair of second elements connected to a power feeding unit and arranged on a second surface facing the first surface.
  • the second dipole antenna has a second dipole antenna in a top view.
  • the second dipole antenna is arranged so as to substantially overlap with the first feeding portion and intersects with the first dipole antenna so that the main portion of the pair of second elements does not overlap with the main portion of the pair of first elements. Any one provided with a dipole antenna may be used.
  • first dipole antenna may be composed of the first bowtie antenna
  • second dipole antenna may be composed of the second bowtie antenna
  • the first bowtie antenna may have a first convex element portion for adjusting the antenna performance extending from the first bowtie antenna on the first surface.
  • the second bowtie antenna may have a second convex element portion for adjusting the antenna performance extending from the second bowtie antenna on the second surface.
  • first bowtie antenna and / or the second bowtie antenna is a side element portion for adjusting the antenna performance extending from the first bowtie antenna and / or the second bowtie antenna on the side surface between the first surface and the second surface. It may have.
  • the first dipole antenna has a first folded element portion extending from the first surface to the second surface
  • the second dipole antenna has a second folded element portion extending from the second surface to the first surface.
  • the first folded element portion is arranged in the area where the second dipole antenna is not arranged in the second surface
  • the second folded element portion is arranged in the first surface in which the first dipole antenna is not arranged. It may be one that is placed in an area that does not exist.
  • first substrate which is arranged between the first surface and the second surface and has a first feeding portion
  • second substrate having a second feeding portion
  • first substrate and the second substrate may be composed of the front surface and the back surface of one substrate.
  • first dipole antenna and the second dipole antenna may be arranged diagonally in a rectangular parallelepiped case.
  • the MIMO antenna device of the present invention has an advantage that interference between antennas can be suppressed in a wide band and miniaturization is possible.
  • FIG. 1 is a schematic view for explaining the MIMO antenna device of the present invention.
  • FIG. 2 is a schematic view for explaining another example of the dipole antenna of the MIMO antenna device of the present invention.
  • FIG. 3 is a schematic view for explaining a modified example of the dipole antenna of the MIMO antenna device of the present invention.
  • FIG. 4 is a graph of isolation characteristics with respect to frequency of the MIMO antenna device of the present invention.
  • FIG. 1A and 1B are schematic views for explaining the MIMO antenna device of the present invention
  • FIG. 1A is a top view
  • FIG. 1B is a cross-sectional view taken along the line bb.
  • the parts with the same reference numerals represent the same products.
  • the MIMO antenna device of the present invention that performs spatial multiplex transmission is mainly composed of a first dipole antenna 10 and a second dipole antenna 20.
  • the MIMO antenna device of the present invention may be housed in, for example, a rectangular parallelepiped case 1.
  • the case 1 may be a small one having a size of, for example, 60 mm ⁇ 80 mm ⁇ 15 mm.
  • the first dipole antenna 10 is composed of a pair of first elements 11.
  • the pair of first elements 11 are arranged on the first surface 12.
  • the first dipole antenna 10 is connected to the first feeding unit 13.
  • the pair of first elements 11 in the illustrated example are shown to be composed of linear elements.
  • the first dipole antenna 10 may be arranged, for example, on the first substrate 14 forming the first surface 12.
  • the first power feeding unit 13 may be arranged on the first substrate 14.
  • the first substrate 14 may be arranged on, for example, a resin base 4.
  • the first substrate 14 may be arranged, for example, between the first surface 12 and the second surface 22 described later.
  • a coaxial cable 2 or the like is connected to the first substrate 14, and is connected to an external device (not shown).
  • the first surface 12 does not necessarily have to be a flat surface, and may be a surface curved to some extent such as a curved surface.
  • the second dipole antenna 20 is composed of a pair of second elements 21.
  • the pair of second elements 21 are arranged on the second surface 22 facing the first surface 12.
  • to face each other does not necessarily mean that the first surface 12 and the second surface 22 are parallel as shown in the drawing, and to some extent if the first surface 12 and the second surface 22 are arranged with a certain gap. It means that they may face each other diagonally.
  • the second surface 22 does not necessarily have to be a flat surface, and may be a surface curved to some extent such as a curved surface.
  • the second dipole antenna 20 is connected to the second feeding unit 23.
  • the pair of second elements 21 in the illustrated example are shown to be composed of linear elements.
  • the second dipole antenna 20 may be arranged, for example, on the second substrate 24 forming the second surface 22. Further, the second power feeding unit 23 may be arranged on the second substrate 24.
  • the second substrate 24 may be arranged on, for example, a resin base 4.
  • the second substrate 24 may be arranged, for example, between the first surface 12 and the second surface 22.
  • a coaxial cable 3 or the like is connected to the second substrate 24, and is connected to an external device (not shown). As shown in the figure, the second dipole antenna 20 is arranged so that the second feeding portion 23 substantially overlaps with the first feeding portion 13 when viewed from above.
  • the main portions of the pair of second elements 21 are arranged so as to intersect the first dipole antenna 10 so as not to overlap the main portions of the pair of first elements 11. That is, elements having the same shape may face each other on the first surface 12 (front surface) and the second surface 22 (back surface), and may be arranged so as to form an X shape when viewed from above.
  • the first substrate 14 and the second substrate 24 are arranged on the front and back surfaces of the base 4, but the present invention is not limited to this, and the first substrate 14 and the second substrate 24 are It may be composed of the front surface and the back surface of one substrate. That is, instead of using two substrates, the front surface of one substrate may be used as the first substrate and the back surface thereof may be used as the second substrate. Further, the first dipole antenna 10 and the second dipole antenna 20 may be patterned by etching, for example, a copper foil of the substrate on the first substrate 14 and the second substrate 24, respectively. However, the present invention is not limited to this, and a conductive wire or the like may be used, or the conductive wire or the like may be bent into an L shape and placed so as to float from the substrate.
  • the first dipole antenna 10 and the second dipole antenna 20 in the illustrated example are shown diagonally arranged in the rectangular parallelepiped case 1.
  • the element length can be arranged longer than that in the case 1 in which the elements are arranged in the + shape in the top view.
  • the present invention is not limited to this, and may be arranged in the case 1 in a + shape in a top view.
  • the first dipole antenna 10 and the second dipole antenna 20 are arranged in a horizontally long case in a + shape (90 degree orthogonal) in a top view
  • the first dipole antenna 10 and the second dipole antenna 20 are ,
  • the element length will change. That is, when each element is arranged in a + shape, the element lengths can be configured to be approximately the same in a square case in a top view, but vertically arranged elements in a horizontally long rectangular case in a top view. Is shorter than the horizontally placed elements. Then, since the resonance frequencies of the two dipole antennas are different, the antenna characteristics such as the gain at the target frequency are different.
  • the MIMO antenna device if the antenna gain difference between the two dipole antennas becomes large, the transmission characteristics are affected. Therefore, even if sufficient isolation can be secured between the antennas, the transmission characteristics may deteriorate due to the difference in antenna gain, and the communication speed may decrease.
  • the two elements are arranged on the diagonal line of the horizontally long case so as to form an X shape when viewed from above, the first dipole antenna 10 and the second dipole antenna 20 have the same element length regardless of the crossing angle. It can be configured with. Therefore, since the antenna gains of the two dipole antennas are substantially equal, it is possible to reduce the possibility that the communication speed will decrease.
  • the element length can be physically lengthened, so that the element length can be physically increased, so that the frequency side can be lowered. Correspondence is also possible.
  • the first dipole antenna 10 and the second dipole antenna 20 of the MIMO antenna device of the present invention are not arranged on the same plane and are circularly polarized. Since it is not intended to obtain a cross dipole antenna, it has a different purpose, configuration, and effect from the cross dipole antenna.
  • the coaxial cables 2 and 3 are used, and the first feeding unit 13 and the second feeding unit 23 are shown by unbalanced feeding.
  • the coaxial cables 2 and 3 connected to the first feeding unit 13 and the second feeding unit 23 are respectively wired between the first surface 12 and the second surface 22. Just do it. That is, in the thickness direction, the first dipole antenna 10 and the second dipole antenna 20 are arranged so as to be located on the outermost side, and the coaxial cables 2 and 3 are wired by utilizing the space between them. As a result, miniaturization is possible by efficiently using the limited area.
  • the MIMO antenna device of the present invention may use a balun or the like if necessary.
  • the MIMO antenna device of the present invention By configuring the MIMO antenna device of the present invention in this way, it is possible to suppress interference between the antennas of the first dipole antenna 10 and the second dipole antenna 20 in a wide band. In addition, since interference between antennas can be suppressed, it is possible to fit the antenna in a small case. Therefore, for example, the size can be reduced to a size that can be stored in the instrument panel of the vehicle.
  • FIG. 2A and 2B are schematic views for explaining another example of the dipole antenna of the MIMO antenna device of the present invention
  • FIG. 2A is a top view
  • FIG. 2B is a sectional view taken along line bb.
  • the parts having the same reference numerals as those in FIG. 1 represent the same objects.
  • the dipole antenna is composed of linear elements, but in the example of FIG. 2, the first dipole antenna 10 is composed of the first bow tie antenna 10'.
  • the second dipole antenna 20 is also composed of the second bowtie antenna 20'.
  • the bowtie antenna has a structure in which two bowtie antennas are arranged so as to intersect with each other in a top view.
  • the bowtie antenna is an antenna having a self-complementary structure, but the bowtie antennas 10'and 20'in the illustrated example have a structure close to the self-complementary structure.
  • the pair of first elements 11 do not have to have a symmetrical shape
  • the pair of second elements 21 do not have to have a symmetrical shape.
  • the bow tie antenna 10'and the bow tie antenna 20' do not have to have symmetrical shapes.
  • the first bow tie antenna 10'and the second bow tie antenna 20'as shown in the illustrated example are made of a conductive plate by sputtering on a sheet metal or a conductive film, a substrate, or plating by a laser direct structuring technique. It may be provided as a form.
  • the first bowtie antenna 10' is arranged on the first surface 12.
  • the surface of the base 4 constitutes the first surface 12.
  • the first substrate 14 having the first feeding portion 13 is fixed to the base portion 4.
  • the first bowtie antenna 10' is connected to the first feeding unit 13.
  • the lower left element is the ground side element
  • the upper right element is the hot side element. Therefore, the first power feeding unit 13 on the upper right side may be connected to the signal line of the first board 14, and the first power feeding unit 13 on the lower left side may be connected to the ground of the first board 14.
  • the second bowtie antenna 20' is arranged on the second surface 22 facing the first surface 12.
  • the back surface of the base 4 constitutes the second surface 22.
  • the second substrate 24 having the second feeding portion 23 is fixed to the base portion 4.
  • the second bowtie antenna 20' is connected to the second feeding unit 23.
  • the lower right element on the back surface side (indicated by the dotted line) is the ground side element, and the upper left element on the back surface side is the hot side element. Therefore, the second power feeding unit 23 on the lower right side may be connected to the signal line of the second board 24, and the second power feeding unit 23 on the upper left side may be connected to the ground of the second board 24.
  • the main part of the second bowtie antenna 20' may be arranged so as to intersect the first bowtie antenna 10'so as not to overlap the main part of the first bowtie antenna 10'.
  • the main part of the antenna means a part on the tip end side of the element that is separated from the feeding part to some extent. It should be noted that the main parts of the antennas may overlap to some extent as long as the antenna performance is acceptable.
  • the illustrated example has a first convex element 15 extending from the first bowtie antenna 10'.
  • the first convex element 15 extends on the first surface 12 and is used for adjusting the antenna performance. That is, by deforming the shape of the first bowtie antenna 10'using the first convex element 15, it is possible to adjust the antenna performance such as frequency characteristics.
  • the shape and position of the first convex element 15 are not limited to those shown in the illustrated example, and may be appropriately determined while observing the antenna performance.
  • the second bowtie antenna 20' may also be provided with a second convex element portion 25 for adjusting the antenna performance extending from the second bowtie antenna 20'on the second surface 22.
  • the shape and position of the second convex element 25 are not limited to those shown in the illustrated example, and may be appropriately determined while observing the antenna performance.
  • the MIMO antenna device of the present invention can have a wider band width than the linear element.
  • the present invention is not limited thereto.
  • the element may be patterned on the circuit board by etching or the like.
  • FIG. 3A and 3B are schematic views for explaining a modified example of the dipole antenna of the MIMO antenna device of the present invention
  • FIG. 3A is a top view
  • FIG. 3B is a partial cross-sectional front view
  • FIG. c) is a side view.
  • the parts having the same reference numerals as those in FIG. 1 represent the same objects.
  • the dipole antenna of the illustrated example is basically based on the bowtie antenna as shown in FIG. As shown in FIG.
  • the first bowtie antenna 10'and the second bowtie antenna 20' show an example in which the above-mentioned convex elements for adjusting the antenna performance are appropriately combined and deformed.
  • the present invention is not limited to this, and any shape may be used as long as it serves as a bowtie antenna in principle.
  • the first bowtie antenna 10' is an antenna extending from the first bowtie antenna 10'on the side surface between the first surface 12 and the second surface 22. It has a first side surface element 16 for performance adjustment. Specifically, the first side surface element 16 extends to the side surface so as to be bent 90 degrees from the pair of first element 11 along the side surface of the base portion 4.
  • the second bowtie antenna 20' has a second side surface element 26 for adjusting antenna performance extending from the second bowtie antenna 20'on the side surface between the first surface 12 and the second surface 22. There is. Specifically, the second side surface element 26 extends to the side surface so as to be bent 90 degrees along the side surface of the base 4 from the pair of second element 21.
  • the side space By using the side space in this way, it is possible to extend the antenna length of the bowtie antenna by using the side elements 16 and 26. This makes it possible to adjust the antenna performance near the lower limit frequency of the dipole antenna.
  • the first side surface element 16 and the second side surface element 26 are not limited to those formed by bending the bowtie antenna by 90 degrees as described above.
  • the side element may be arranged inside or outside the case covering the MIMO antenna device, and the side element may be electrically connected to the bowtie antenna.
  • the second dipole antenna 20 may be configured to have a second folded element portion 27 extending from the second surface 22 to the first surface 12.
  • the second folded element portion 27 is configured to further extend the pair of second elements 21 arranged on the second surface 22 onto the first surface 12.
  • the second folded element portion 27 may have a shape that allows the antenna performance to be adjusted as appropriate. For example, as shown in the figure, one may be L-shaped and the other may be triangular, or the same shape. Is also good.
  • the second folded element portion 27 and the second element 21 may be electrically connected by the second side surface connecting portion 28.
  • the second side surface connecting portion 28 may be provided by sheet metal processing or the like integrally with the second element 21 and the second folded element portion 27 using a conductive plate-shaped body. Further, the second folded element portion 27 and the second element 21 may be connected by using a through hole, wiring, or the like.
  • the first dipole antenna 10 may be configured to further include a first folded element portion 17 extending from the first surface 12 to the second surface 22.
  • the first folded element portion 17 is configured to further extend the pair of first elements 11 arranged on the first surface 12 onto the second surface 22.
  • the first folded element portion 17 may also have a shape that allows the antenna performance to be adjusted as appropriate. For example, as shown in the figure, one may be L-shaped and the other may be triangular, or the same shape. Is also good.
  • the first folded element portion 17 and the first element 11 may be electrically connected by the first side surface connecting portion 18.
  • the second folded element portion 27 may be arranged in the area where the first dipole antenna 10'is not arranged in the first surface 12.
  • the first folded element portion 17 may also be arranged in the area where the second dipole antenna 20'is not arranged in the second surface 22.
  • first folded element portion 17 and the second folded element portion 27 may also be appropriately inserted and fixed to the insertion portion 5 provided on the side surface of the base portion 4.
  • the antennas on the first surface 12 and the second surface 22 can be formed completely symmetrically. Therefore, when two ports (two antennas) are not required, one antenna is used. It is also possible to easily make a 1-port antenna device by removing it. Further, for example, in the above illustrated example, the example in which the MIMO antenna device uses two dipole antennas has been described, but the present invention is not limited to this, and a dipole antenna is further added, and the main part of the element is heavy. It is also possible to increase the number of ports while suppressing interference between antennas by arranging them so as to intersect each other.
  • FIG. 4 is a graph of isolation characteristics with respect to frequency of the MIMO antenna device of the present invention.
  • the horizontal axis is frequency and the vertical axis is isolation.
  • the gray line is a desired specification, and if it is lower than this, it is a level considered to be good isolation. As shown in the figure, it can be seen that the MIMO antenna device of the present invention can secure good isolation characteristics over a wide band.
  • the MIMO antenna device of the present invention is not limited to the above illustrated example, and it goes without saying that various modifications can be made without departing from the gist of the present invention.

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Variable-Direction Aerials And Aerial Arrays (AREA)
  • Details Of Aerials (AREA)

Abstract

Provided is a compact MIMO antenna device capable of suppressing interference between antennas in wide bands. A MIMO antenna device for performing spatial multiplex transmission comprises a first dipole antenna 10 and a second dipole antenna 20. The first dipole antenna 10 comprises a pair of first elements 11 connected to a first feed unit 13 and disposed on a first surface 12. The second dipole antenna 20 comprises a pair of second elements 21 connected to a second feed unit 23 and disposed on a second surface 22 opposing the first surface 12. The second dipole antenna 20 is disposed across the first dipole antenna 10 in a top view, with the second feed unit 23 generally overlapping the first feed unit 13 and without major parts of the pair of second elements 21 overlapping major parts of the pair of first elements 11.

Description

ＭＩＭＯアンテナ装置MIMO antenna device
　本発明はＭＩＭＯアンテナ装置に関し、特に、小型且つ広帯域なＭＩＭＯアンテナ装置に関する。 The present invention relates to a MIMO antenna device, and more particularly to a small and wide band MIMO antenna device.
　近来、自動運転を目指す自動車において、携帯電話網を用いる広域通信ネットワークは、通信する情報の大容量化・高速化等が進められている。例えば、大容量化・高速化を図るために空間多重伝送を行う技術として、ＭＩＭＯ（Ｍｕｌｔｉｐｌｅ　Ｉｍｐｕｔ　Ｍｕｌｔｉｐｌｅ　Ｏｕｔｐｕｔ）技術が知られている。複数のアンテナ素子を用いるＭＩＭＯアンテナ装置においては、一般的にアンテナ素子間を離して設置することでアイソレーションを確保する必要がある等、設計上の制約が多い。また、近年自動車の車両内部のアンテナ搭載スペースは、エアバッグ等の他の機器により制約される傾向にあり、車両内部に搭載可能な大きさまで小型化するのは難しかった。 Recently, in automobiles aiming for autonomous driving, wide-area communication networks that use mobile phone networks are being promoted to increase the capacity and speed of communication information. For example, MIMO (Multiple Input Multiple Output) technology is known as a technology for performing spatial multiplex transmission in order to increase the capacity and speed. In a MIMO antenna device using a plurality of antenna elements, there are many design restrictions such that it is generally necessary to secure isolation by installing the antenna elements apart from each other. Further, in recent years, the space for mounting an antenna inside an automobile has tended to be restricted by other devices such as an airbag, and it has been difficult to reduce the size to a size that can be mounted inside the vehicle.
　また、例えば複数の周波数帯域で複数のアンテナ素子を用いて多重帯域アンテナ装置を実現するものとして特許文献１がある。特許文献１は、アンテナ素子間の干渉の影響を最大限減らしつつ、低周波帯域のアンテナ設置空間と同一の空間に高周波帯域のアンテナを挿入する構造を有するものである。 Further, for example, Patent Document 1 discloses a multi-band antenna device using a plurality of antenna elements in a plurality of frequency bands. Patent Document 1 has a structure in which a high-frequency band antenna is inserted into the same space as the low-frequency band antenna installation space while minimizing the influence of interference between antenna elements.
　また、自動車に搭載可能とするためにアンテナ装置を薄型化したものとして、特許文献２がある。特許文献２は、円偏波に対応するためにクロスダイポールアンテナをシート状の誘電体上に形成したものである。クロスダイポールアンテナを構成する第１のダイポールアンテナと第２のダイポールアンテナにおいては、これらに給電を行う平衡給電線を隙間なく隣接させて配置する必要がある。したがって、第１のダイポールアンテナの一方のアンテナエレメントと第２のダイポールアンテナの一方のアンテナエレメントを誘電体の裏面側に配置することで、側方から見て平衡給電線が上下に揃ったように配置できるようにしている。 Further, there is Patent Document 2 as a thin antenna device so that it can be mounted on an automobile. Patent Document 2 is a cross-dipole antenna formed on a sheet-shaped dielectric in order to cope with circularly polarized waves. In the first dipole antenna and the second dipole antenna constituting the cross dipole antenna, it is necessary to arrange the balanced feeders for feeding the cross dipole antennas adjacent to each other without any gap. Therefore, by arranging one antenna element of the first dipole antenna and one antenna element of the second dipole antenna on the back surface side of the dielectric, the balanced feeder lines are aligned vertically when viewed from the side. It is possible to arrange it.
特表２０１６－５３５５１２号公報Special Table 2016-535512 特開２００４－２４２２７７号公報Japanese Unexamined Patent Publication No. 2004-242277
　しかしながら、特許文献１のアンテナ装置は、基地局や中継器に用いられるものであり、車載するような小型化を意識したものではなかった。また、小型化した際の広帯域におけるアンテナ素子間の干渉の影響についても何ら考慮していないものである。 However, the antenna device of Patent Document 1 was used for a base station and a repeater, and was not conscious of miniaturization such as being mounted on a vehicle. In addition, the influence of interference between antenna elements in a wide band when miniaturized is not considered at all.
　また、特許文献２のアンテナ装置は、クロスダイポールアンテナを用いて円偏波に対応させたものであり、ＭＩＭＯアンテナ装置として使用できるものではなかった。また、第１のダイポールアンテナと第２のダイポールアンテナ間の干渉の影響を抑制する目的でもなかった。さらに、ダイポールアンテナのアンテナエレメントの配置位置の違いや平衡給電線の構造等による設計上の制約が多く、小型化が難しかった。 Further, the antenna device of Patent Document 2 is one that corresponds to circularly polarized waves by using a cross dipole antenna, and cannot be used as a MIMO antenna device. Nor was it intended to suppress the effects of interference between the first dipole antenna and the second dipole antenna. Further, there are many design restrictions due to the difference in the arrangement position of the antenna element of the dipole antenna and the structure of the balanced feeder, and it is difficult to reduce the size.
　本発明は、斯かる実情に鑑み、広帯域にアンテナ間の干渉を抑制すると共に小型化が可能なＭＩＭＯアンテナ装置を提供しようとするものである。 In view of such circumstances, the present invention is intended to provide a MIMO antenna device capable of suppressing interference between antennas in a wide band and being miniaturized.
　上述した本発明の目的を達成するために、本発明によるＭＩＭＯアンテナ装置は、第１給電部に接続され第１面上に配置される一対の第１エレメントからなる第１ダイポールアンテナと、第２給電部に接続され第１面に対向する第２面上に配置される一対の第２エレメントからなる第２ダイポールアンテナであって、該第２ダイポールアンテナが、上面視で第２給電部が第１給電部と概ね重なるように配置されると共に、一対の第２エレメントの主要部が一対の第１エレメントの主要部と重ならないように、第１ダイポールアンテナに交差して配置される、第２ダイポールアンテナと、を具備するものであれば良い。 In order to achieve the above-described object of the present invention, the MIMO antenna device according to the present invention includes a first dipole antenna composed of a pair of first elements connected to a first feeding unit and arranged on a first surface, and a second dipole antenna. A second dipole antenna composed of a pair of second elements connected to a power feeding unit and arranged on a second surface facing the first surface. The second dipole antenna has a second dipole antenna in a top view. The second dipole antenna is arranged so as to substantially overlap with the first feeding portion and intersects with the first dipole antenna so that the main portion of the pair of second elements does not overlap with the main portion of the pair of first elements. Any one provided with a dipole antenna may be used.
　ここで、第１給電部及び第２給電部にそれぞれ接続される同軸ケーブルが、第１面と第２面の間にそれぞれ配線されるものであれば良い。 Here, it suffices if the coaxial cables connected to the first power feeding unit and the second power feeding unit are respectively wired between the first surface and the second surface.
　また、第１ダイポールアンテナは、第１ボウタイアンテナからなり、第２ダイポールアンテナは、第２ボウタイアンテナからなるものであっても良い。 Further, the first dipole antenna may be composed of the first bowtie antenna, and the second dipole antenna may be composed of the second bowtie antenna.
　また、第１ボウタイアンテナは、第１ボウタイアンテナから第１面上に延在するアンテナ性能調整用の第１用凸状エレメント部を有するものであっても良い。 Further, the first bowtie antenna may have a first convex element portion for adjusting the antenna performance extending from the first bowtie antenna on the first surface.
　また、第２ボウタイアンテナは、第２ボウタイアンテナから第２面上に延在するアンテナ性能調整用の第２用凸状エレメント部を有するものであっても良い。 Further, the second bowtie antenna may have a second convex element portion for adjusting the antenna performance extending from the second bowtie antenna on the second surface.
　また、第１ボウタイアンテナ及び／又は第２ボウタイアンテナは、第１面と第２面の間の側面に第１ボウタイアンテナ及び／又は第２ボウタイアンテナから延在するアンテナ性能調整用の側面エレメント部を有するものであっても良い。 Further, the first bowtie antenna and / or the second bowtie antenna is a side element portion for adjusting the antenna performance extending from the first bowtie antenna and / or the second bowtie antenna on the side surface between the first surface and the second surface. It may have.
　また、第１ダイポールアンテナは、第１面から第２面へ延在する第１折り返しエレメント部を有し、第２ダイポールアンテナは、第２面から第１面へ延在する第２折り返しエレメント部を有し、第１折り返しエレメント部は、第２面内で第２ダイポールアンテナの配置されていないエリアに配置され、第２折り返しエレメント部は、第１面内で第１ダイポールアンテナの配置されていないエリアに配置される、ものであっても良い。 Further, the first dipole antenna has a first folded element portion extending from the first surface to the second surface, and the second dipole antenna has a second folded element portion extending from the second surface to the first surface. The first folded element portion is arranged in the area where the second dipole antenna is not arranged in the second surface, and the second folded element portion is arranged in the first surface in which the first dipole antenna is not arranged. It may be one that is placed in an area that does not exist.
　さらに、第１面と第２面の間に配置され、第１給電部を有する第１基板と、第２給電部を有する第２基板と、を有するものであっても良い。 Further, it may have a first substrate which is arranged between the first surface and the second surface and has a first feeding portion, and a second substrate having a second feeding portion.
　また、第１基板と第２基板は、１枚の基板の表面と裏面からなるものであっても良い。 Further, the first substrate and the second substrate may be composed of the front surface and the back surface of one substrate.
　また、第１ダイポールアンテナ及び第２ダイポールアンテナは、直方体のケース内で、対角線上にそれぞれ配置されるものであれば良い。 Further, the first dipole antenna and the second dipole antenna may be arranged diagonally in a rectangular parallelepiped case.
　本発明のＭＩＭＯアンテナ装置には、広帯域にアンテナ間の干渉を抑制すると共に小型化が可能であるという利点がある。 The MIMO antenna device of the present invention has an advantage that interference between antennas can be suppressed in a wide band and miniaturization is possible.
図１は、本発明のＭＩＭＯアンテナ装置を説明するための概略図である。FIG. 1 is a schematic view for explaining the MIMO antenna device of the present invention. 図２は、本発明のＭＩＭＯアンテナ装置のダイポールアンテナの他の例を説明するための概略図である。FIG. 2 is a schematic view for explaining another example of the dipole antenna of the MIMO antenna device of the present invention. 図３は、本発明のＭＩＭＯアンテナ装置のダイポールアンテナの変形例を説明するための概略図である。FIG. 3 is a schematic view for explaining a modified example of the dipole antenna of the MIMO antenna device of the present invention. 図４は、本発明のＭＩＭＯアンテナ装置の周波数に対するアイソレーション特性のグラフである。FIG. 4 is a graph of isolation characteristics with respect to frequency of the MIMO antenna device of the present invention.
　以下、本発明を実施するための形態を図示例と共に説明する。図１は、本発明のＭＩＭＯアンテナ装置を説明するための概略図であり、図１（ａ）は上面図、図１（ｂ）はｂ－ｂ断面図である。図中、同一の符号を付した部分は同一物を表している。空間多重伝送を行う本発明のＭＩＭＯアンテナ装置は、図示の通り、第１ダイポールアンテナ１０と、第２ダイポールアンテナ２０と、から主に構成されている。本発明のＭＩＭＯアンテナ装置は、例えば直方体のケース１内に収納されれば良い。ケース１は、例えば６０ｍｍ×８０ｍｍ×１５ｍｍのサイズのような小型のものでも良い。 Hereinafter, a mode for carrying out the present invention will be described with an illustrated example. 1A and 1B are schematic views for explaining the MIMO antenna device of the present invention, FIG. 1A is a top view, and FIG. 1B is a cross-sectional view taken along the line bb. In the figure, the parts with the same reference numerals represent the same products. As shown in the figure, the MIMO antenna device of the present invention that performs spatial multiplex transmission is mainly composed of a first dipole antenna 10 and a second dipole antenna 20. The MIMO antenna device of the present invention may be housed in, for example, a rectangular parallelepiped case 1. The case 1 may be a small one having a size of, for example, 60 mm × 80 mm × 15 mm.
　第１ダイポールアンテナ１０は、一対の第１エレメント１１からなる。一対の第１エレメント１１は、第１面１２上に配置されている。第１ダイポールアンテナ１０は、第１給電部１３に接続されている。図示例の一対の第１エレメント１１は、線状エレメントで構成されるものを示した。第１ダイポールアンテナ１０は、例えば第１面１２を形成する第１基板１４上に配置されれば良い。また、第１給電部１３は、第１基板１４に配置されれば良い。第１基板１４は、例えば樹脂製の基部４上に配置されれば良い。第１基板１４は、例えば第１面１２と後述する第２面２２の間に配置されれば良い。第１基板１４には、同軸ケーブル２等が接続され、外部機器（図示せず）と接続されている。なお、第１面１２は、平面である必要は必ずしもなく、曲面のようなある程度湾曲した面であっても良い。 The first dipole antenna 10 is composed of a pair of first elements 11. The pair of first elements 11 are arranged on the first surface 12. The first dipole antenna 10 is connected to the first feeding unit 13. The pair of first elements 11 in the illustrated example are shown to be composed of linear elements. The first dipole antenna 10 may be arranged, for example, on the first substrate 14 forming the first surface 12. Further, the first power feeding unit 13 may be arranged on the first substrate 14. The first substrate 14 may be arranged on, for example, a resin base 4. The first substrate 14 may be arranged, for example, between the first surface 12 and the second surface 22 described later. A coaxial cable 2 or the like is connected to the first substrate 14, and is connected to an external device (not shown). The first surface 12 does not necessarily have to be a flat surface, and may be a surface curved to some extent such as a curved surface.
　第２ダイポールアンテナ２０は、一対の第２エレメント２１からなる。一対の第２エレメント２１は、第１面１２に対向する第２面２２上に配置されている。ここで、対向するとは、必ずしも第１面１２と第２面２２が図示のように平行である必要はなく、第１面１２と第２面２２がある程度間を開けて配置されていればある程度斜めに対向しても良いことを意味する。また、第２面２２も、平面である必要は必ずしもなく、曲面のようなある程度湾曲した面であっても良い。第２ダイポールアンテナ２０は、第２給電部２３に接続されている。図示例の一対の第２エレメント２１は、線状エレメントで構成されるものを示した。第２ダイポールアンテナ２０は、例えば第２面２２を形成する第２基板２４上に配置されれば良い。また、第２給電部２３は、第２基板２４に配置されれば良い。第２基板２４は、例えば樹脂製の基部４上に配置されれば良い。第２基板２４は、例えば第１面１２と第２面２２の間に配置されれば良い。第２基板２４には、同軸ケーブル３等が接続され、外部機器（図示せず）と接続されている。図示の通り、第２ダイポールアンテナ２０は、上面視で第２給電部２３が第１給電部１３と概ね重なるように配置されている。第１給電部１３と第２給電部２３が上面視で概ね重なるように配置されるとは、第１給電部１３と第２給電部２３が上面視で概ね第１ダイポールアンテナ１０や第２ダイポールアンテナ２０の中心付近に配置されるものであれば良いことを意味する。また、一対の第２エレメント２１の主要部が、一対の第１エレメント１１の主要部と重ならないように、第１ダイポールアンテナ１０に交差して配置されている。即ち、第１面１２（表面）と第２面２２（裏面）にそれぞれ同じ形状のエレメントを向かい合わせ、上面視でＸ字状になるように配置されれば良い。 The second dipole antenna 20 is composed of a pair of second elements 21. The pair of second elements 21 are arranged on the second surface 22 facing the first surface 12. Here, to face each other does not necessarily mean that the first surface 12 and the second surface 22 are parallel as shown in the drawing, and to some extent if the first surface 12 and the second surface 22 are arranged with a certain gap. It means that they may face each other diagonally. Further, the second surface 22 does not necessarily have to be a flat surface, and may be a surface curved to some extent such as a curved surface. The second dipole antenna 20 is connected to the second feeding unit 23. The pair of second elements 21 in the illustrated example are shown to be composed of linear elements. The second dipole antenna 20 may be arranged, for example, on the second substrate 24 forming the second surface 22. Further, the second power feeding unit 23 may be arranged on the second substrate 24. The second substrate 24 may be arranged on, for example, a resin base 4. The second substrate 24 may be arranged, for example, between the first surface 12 and the second surface 22. A coaxial cable 3 or the like is connected to the second substrate 24, and is connected to an external device (not shown). As shown in the figure, the second dipole antenna 20 is arranged so that the second feeding portion 23 substantially overlaps with the first feeding portion 13 when viewed from above. The fact that the first feeding unit 13 and the second feeding unit 23 are arranged so as to substantially overlap each other in the top view means that the first feeding unit 13 and the second feeding unit 23 are arranged so as to be substantially overlapped with each other in the top view. It means that it may be arranged near the center of the antenna 20. Further, the main portions of the pair of second elements 21 are arranged so as to intersect the first dipole antenna 10 so as not to overlap the main portions of the pair of first elements 11. That is, elements having the same shape may face each other on the first surface 12 (front surface) and the second surface 22 (back surface), and may be arranged so as to form an X shape when viewed from above.
　なお、図示例では、基部４の表裏に第１基板１４と第２基板２４がそれぞれ配置される例を示したが、本発明はこれに限定されず、第１基板１４と第２基板２４は、１枚の基板の表面と裏面からなるものであっても良い。即ち、基板を２枚用いないで、１枚の基板の表面を第１基板として用い、その裏面を第２基板として用いるように構成しても良い。また、第１ダイポールアンテナ１０や第２ダイポールアンテナ２０は、それぞれ第１基板１４や第２基板２４上に例えば基板の銅箔をエッチング等することでパターンニング形成されれば良い。しかしながら、本発明はこれに限定されず、導電線等を用いても良いし、導電線等を例えばＬ字状に折り曲げて基板から浮かせて配置させても良い。 In the illustrated example, the first substrate 14 and the second substrate 24 are arranged on the front and back surfaces of the base 4, but the present invention is not limited to this, and the first substrate 14 and the second substrate 24 are It may be composed of the front surface and the back surface of one substrate. That is, instead of using two substrates, the front surface of one substrate may be used as the first substrate and the back surface thereof may be used as the second substrate. Further, the first dipole antenna 10 and the second dipole antenna 20 may be patterned by etching, for example, a copper foil of the substrate on the first substrate 14 and the second substrate 24, respectively. However, the present invention is not limited to this, and a conductive wire or the like may be used, or the conductive wire or the like may be bent into an L shape and placed so as to float from the substrate.
　図示例の第１ダイポールアンテナ１０及び第２ダイポールアンテナ２０は、直方体のケース１内で、対角線上にそれぞれ配置されるものを示した。ケース１内に上面視でＸ字状に各エレメントが配置されることで、上面視で＋字状に配置されるものに比べてエレメント長を長く配置可能となる。しかしながら本発明はこれに限定されず、ケース１内に上面視で＋字状に配置されるものであっても良い。 The first dipole antenna 10 and the second dipole antenna 20 in the illustrated example are shown diagonally arranged in the rectangular parallelepiped case 1. By arranging each element in the case 1 in an X shape in the top view, the element length can be arranged longer than that in the case 1 in which the elements are arranged in the + shape in the top view. However, the present invention is not limited to this, and may be arranged in the case 1 in a + shape in a top view.
　ここで、第１ダイポールアンテナ１０と第２ダイポールアンテナ２０を、横長のケース内に上面視で＋字状（９０度直交に）に配置した場合、第１ダイポールアンテナ１０と第２ダイポールアンテナ２０は、エレメント長が変わってしまうことになる。即ち、各エレメントを＋字状に配置すると、上面視で正方形のケースであればエレメント長は概ね等しく構成可能であるが、上面視で横長の長方形のケースであれば、縦に配置されたエレメントのほうが横に配置されたエレメントよりも短くなってしまう。そうすると、２つのダイポールアンテナの共振周波数が異なってしまうため、ターゲット周波数における利得等のアンテナ特性が異なるものとなる。ＭＩＭＯアンテナ装置においては、２つのダイポールアンテナのアンテナ利得差が大きくなると、伝送特性に影響を及ぼしてしまう。したがって、アンテナ間で十分なアイソレーションを確保できたとしても、アンテナ利得の違いにより伝送特性が悪くなり、通信速度が低下するおそれがある。しかしながら、横長のケースの対角線上に上面視でＸ字状になるように２つのエレメントを配置すれば、交差角度に関わらず、第１ダイポールアンテナ１０及び第２ダイポールアンテナ２０は、同様のエレメント長で構成可能となる。したがって、２つのダイポールアンテナのアンテナ利得は概ね等しくなるため、通信速度が低下する可能性を低減可能となる。さらに、横長のケースの対角線上に上面視でＸ字状になるように２つのエレメントを配置した場合には、物理的にエレメント長を長くすることが可能となるため、より低周波数側への対応も可能となる。 Here, when the first dipole antenna 10 and the second dipole antenna 20 are arranged in a horizontally long case in a + shape (90 degree orthogonal) in a top view, the first dipole antenna 10 and the second dipole antenna 20 are , The element length will change. That is, when each element is arranged in a + shape, the element lengths can be configured to be approximately the same in a square case in a top view, but vertically arranged elements in a horizontally long rectangular case in a top view. Is shorter than the horizontally placed elements. Then, since the resonance frequencies of the two dipole antennas are different, the antenna characteristics such as the gain at the target frequency are different. In the MIMO antenna device, if the antenna gain difference between the two dipole antennas becomes large, the transmission characteristics are affected. Therefore, even if sufficient isolation can be secured between the antennas, the transmission characteristics may deteriorate due to the difference in antenna gain, and the communication speed may decrease. However, if the two elements are arranged on the diagonal line of the horizontally long case so as to form an X shape when viewed from above, the first dipole antenna 10 and the second dipole antenna 20 have the same element length regardless of the crossing angle. It can be configured with. Therefore, since the antenna gains of the two dipole antennas are substantially equal, it is possible to reduce the possibility that the communication speed will decrease. Furthermore, when two elements are arranged on the diagonal line of the horizontally long case so as to form an X shape when viewed from above, the element length can be physically lengthened, so that the element length can be physically increased, so that the frequency side can be lowered. Correspondence is also possible.
　なお、上面視だとクロスダイポールアンテナのように見えるが、本発明のＭＩＭＯアンテナ装置の第１ダイポールアンテナ１０と第２ダイポールアンテナ２０は、同一平面上に配置されるものではなく、また円偏波を得るためのものでもないため、クロスダイポールアンテナとは目的も構成も効果も異なるものである。 Although it looks like a cross dipole antenna when viewed from above, the first dipole antenna 10 and the second dipole antenna 20 of the MIMO antenna device of the present invention are not arranged on the same plane and are circularly polarized. Since it is not intended to obtain a cross dipole antenna, it has a different purpose, configuration, and effect from the cross dipole antenna.
　また、上述の図示例では、同軸ケーブル２，３を用いて第１給電部１３や第２給電部２３に不平衡給電によるものを示した。ここで、本発明のＭＩＭＯアンテナ装置では、第１給電部１３及び第２給電部２３にそれぞれ接続される同軸ケーブル２，３は、第１面１２と第２面２２の間にそれぞれ配線されれば良い。即ち、厚さ方向において、第１ダイポールアンテナ１０や第２ダイポールアンテナ２０が最も外側に位置するように配置し、これらの間の空間を利用して同軸ケーブル２，３を配線する。これにより、限られたエリアを効率良く利用することで小型化が可能となる。なお、本発明のＭＩＭＯアンテナ装置は、必要によりバラン等を用いても良い。 Further, in the above illustrated example, the coaxial cables 2 and 3 are used, and the first feeding unit 13 and the second feeding unit 23 are shown by unbalanced feeding. Here, in the MIMO antenna device of the present invention, the coaxial cables 2 and 3 connected to the first feeding unit 13 and the second feeding unit 23 are respectively wired between the first surface 12 and the second surface 22. Just do it. That is, in the thickness direction, the first dipole antenna 10 and the second dipole antenna 20 are arranged so as to be located on the outermost side, and the coaxial cables 2 and 3 are wired by utilizing the space between them. As a result, miniaturization is possible by efficiently using the limited area. The MIMO antenna device of the present invention may use a balun or the like if necessary.
　本発明のＭＩＭＯアンテナ装置は、このように構成されることで、第１ダイポールアンテナ１０と第２ダイポールアンテナ２０のアンテナ間の干渉を広帯域に抑制することが可能となる。また、アンテナ間の干渉を抑制できるため、小型のケース内に収めることが可能となる。したがって、例えば車両のインストゥルメンタルパネル内に収納可能なサイズまで小型化が可能となる。 By configuring the MIMO antenna device of the present invention in this way, it is possible to suppress interference between the antennas of the first dipole antenna 10 and the second dipole antenna 20 in a wide band. In addition, since interference between antennas can be suppressed, it is possible to fit the antenna in a small case. Therefore, for example, the size can be reduced to a size that can be stored in the instrument panel of the vehicle.
　次に、図２を用いて本発明のＭＩＭＯアンテナ装置のダイポールアンテナの他の例を説明する。図２は、本発明のＭＩＭＯアンテナ装置のダイポールアンテナの他の例を説明するための概略図であり、図２（ａ）は上面図、図２（ｂ）はｂ－ｂ断面図である。図中、図１と同一の符号を付した部分は同一物を表している。図１の例では、ダイポールアンテナが線状エレメントで構成されるものを示したが、図２の例では、第１ダイポールアンテナ１０が、第１ボウタイアンテナ１０'からなるものを示した。また、第２ダイポールアンテナ２０も、第２ボウタイアンテナ２０'からなる。即ち、２つのボウタイアンテナを上面視で交差して配置した構造を有するものである。一般的にボウタイアンテナは自己補対構造を有するアンテナであるが、図示例のボウタイアンテナ１０'，２０'は、自己補対構造に近い構造である。図示例のように一対の第１エレメント１１はそれぞれ対称形状でなくても良く、一対の第２エレメント２１もそれぞれ対称形状でなくても良い。さらに、ボウタイアンテナ１０'とボウタイアンテナ２０'も対称形状でなくても良い。図示例のような第１ボウタイアンテナ１０'や第２ボウタイアンテナ２０'は、板金や導電性フィルム、また基板上にスパッタリング形成したものや、レーザ直接構造化技術によるメッキ等により、導電性の板状体として提供されれば良い。 Next, another example of the dipole antenna of the MIMO antenna device of the present invention will be described with reference to FIG. 2A and 2B are schematic views for explaining another example of the dipole antenna of the MIMO antenna device of the present invention, FIG. 2A is a top view, and FIG. 2B is a sectional view taken along line bb. In the figure, the parts having the same reference numerals as those in FIG. 1 represent the same objects. In the example of FIG. 1, the dipole antenna is composed of linear elements, but in the example of FIG. 2, the first dipole antenna 10 is composed of the first bow tie antenna 10'. The second dipole antenna 20 is also composed of the second bowtie antenna 20'. That is, it has a structure in which two bowtie antennas are arranged so as to intersect with each other in a top view. Generally, the bowtie antenna is an antenna having a self-complementary structure, but the bowtie antennas 10'and 20'in the illustrated example have a structure close to the self-complementary structure. As shown in the illustrated example, the pair of first elements 11 do not have to have a symmetrical shape, and the pair of second elements 21 do not have to have a symmetrical shape. Further, the bow tie antenna 10'and the bow tie antenna 20' do not have to have symmetrical shapes. The first bow tie antenna 10'and the second bow tie antenna 20'as shown in the illustrated example are made of a conductive plate by sputtering on a sheet metal or a conductive film, a substrate, or plating by a laser direct structuring technique. It may be provided as a form.
　第１ボウタイアンテナ１０'は、第１面１２上に配置されている。図示例では、基部４の表面が第１面１２を構成している。そして、第１給電部１３を有する第１基板１４が、基部４に固定されている。第１ボウタイアンテナ１０'は、第１給電部１３に接続されている。図２（ａ）に示される例では、左下側のエレメントがグラウンド側エレメントであり、右上側のエレメントがホット側のエレメントである。したがって、右上側の第１給電部１３が第１基板１４の信号線に接続され、左下側の第１給電部１３が第１基板１４のグラウンドに接続されれば良い。 The first bowtie antenna 10'is arranged on the first surface 12. In the illustrated example, the surface of the base 4 constitutes the first surface 12. Then, the first substrate 14 having the first feeding portion 13 is fixed to the base portion 4. The first bowtie antenna 10'is connected to the first feeding unit 13. In the example shown in FIG. 2A, the lower left element is the ground side element, and the upper right element is the hot side element. Therefore, the first power feeding unit 13 on the upper right side may be connected to the signal line of the first board 14, and the first power feeding unit 13 on the lower left side may be connected to the ground of the first board 14.
　また、第２ボウタイアンテナ２０'は、第１面１２に対向する第２面２２上に配置されている。図示例では、基部４の裏面が第２面２２を構成している。そして、第２給電部２３を有する第２基板２４が、基部４に固定されている。第２ボウタイアンテナ２０'は、第２給電部２３に接続されている。図２（ａ）に示される例では、裏面側（点線で示される）の右下側エレメントがグラウンド側エレメントであり、裏面側の左上側のエレメントがホット側のエレメントである。したがって、右下側の第２給電部２３が第２基板２４の信号線に接続され、左上側の第２給電部２３が第２基板２４のグラウンドに接続されれば良い。そして、第２ボウタイアンテナ２０'の主要部が、第１ボウタイアンテナ１０'の主要部と重ならないように、第１ボウタイアンテナ１０'に交差して配置されれば良い。ここで、アンテナの主要部とは、給電部からある程度離れたエレメントの先端側の部分を意味する。なお、各アンテナの主要部は、アンテナ性能が許容できる範囲であれば、ある程度は重なっていても問題ない。 Further, the second bowtie antenna 20'is arranged on the second surface 22 facing the first surface 12. In the illustrated example, the back surface of the base 4 constitutes the second surface 22. Then, the second substrate 24 having the second feeding portion 23 is fixed to the base portion 4. The second bowtie antenna 20'is connected to the second feeding unit 23. In the example shown in FIG. 2A, the lower right element on the back surface side (indicated by the dotted line) is the ground side element, and the upper left element on the back surface side is the hot side element. Therefore, the second power feeding unit 23 on the lower right side may be connected to the signal line of the second board 24, and the second power feeding unit 23 on the upper left side may be connected to the ground of the second board 24. Then, the main part of the second bowtie antenna 20'may be arranged so as to intersect the first bowtie antenna 10'so as not to overlap the main part of the first bowtie antenna 10'. Here, the main part of the antenna means a part on the tip end side of the element that is separated from the feeding part to some extent. It should be noted that the main parts of the antennas may overlap to some extent as long as the antenna performance is acceptable.
　また、図示例のものは、第１ボウタイアンテナ１０'から延在する第１用凸状エレメント１５を有している。第１用凸状エレメント１５は、第１面１２上に延在するものであり、アンテナ性能調整用に用いられる。即ち、第１ボウタイアンテナ１０'の形状を、第１用凸状エレメント１５を用いて変形させることで、周波数特性等のアンテナ性能を調整することが可能である。なお、第１用凸状エレメント１５の形状や位置は、図示例のものには限定されず、アンテナ性能を見ながら適宜決定されれば良い。 Further, the illustrated example has a first convex element 15 extending from the first bowtie antenna 10'. The first convex element 15 extends on the first surface 12 and is used for adjusting the antenna performance. That is, by deforming the shape of the first bowtie antenna 10'using the first convex element 15, it is possible to adjust the antenna performance such as frequency characteristics. The shape and position of the first convex element 15 are not limited to those shown in the illustrated example, and may be appropriately determined while observing the antenna performance.
　同様に、第２ボウタイアンテナ２０'にも、第２ボウタイアンテナ２０'から第２面２２上に延在するアンテナ性能調整用の第２用凸状エレメント部２５を設けても良い。なお、第２用凸状エレメント２５の形状や位置も、図示例のものには限定されず、アンテナ性能を見ながら適宜決定されれば良い。 Similarly, the second bowtie antenna 20'may also be provided with a second convex element portion 25 for adjusting the antenna performance extending from the second bowtie antenna 20'on the second surface 22. The shape and position of the second convex element 25 are not limited to those shown in the illustrated example, and may be appropriately determined while observing the antenna performance.
　本発明のＭＩＭＯアンテナ装置は、このようなボウタイアンテナを用いることで、線状エレメントと比べてより広帯域化が可能となる。 By using such a bowtie antenna, the MIMO antenna device of the present invention can have a wider band width than the linear element.
　なお、上述の図示例では、第１ダイポールアンテナ１０や第２ダイポールアンテナ２０は、線状エレメントや板金エレメントを用いた例を説明したが、本発明はこれに限定されない。例えば、回路基板上にエレメントをエッチング等によりパターンニング形成しても良い。 In the above illustrated example, an example in which the first dipole antenna 10 and the second dipole antenna 20 use a linear element or a sheet metal element has been described, but the present invention is not limited thereto. For example, the element may be patterned on the circuit board by etching or the like.
　次に、図３を用いて本発明のＭＩＭＯアンテナ装置のダイポールアンテナの変形例を説明する。図３は、本発明のＭＩＭＯアンテナ装置のダイポールアンテナの変形例を説明するための概略図であり、図３（ａ）は上面図、図３（ｂ）は一部断面前面図、図３（ｃ）は横側面図である。図中、図１と同一の符号を付した部分は同一物を表している。図示例のダイポールアンテナは、基本的には図２に示されるようなボウタイアンテナをベースにしている。図３に示されるように、第１ボウタイアンテナ１０'や第２ボウタイアンテナ２０'は、上述のアンテナ性能調整用の凸状エレメントを適宜組み合わせて変形させた例を示した。しかしながら、本発明はこれに限定されず、原理的にボウタイアンテナとなるものであれば、如何なる形状であっても良い。 Next, a modified example of the dipole antenna of the MIMO antenna device of the present invention will be described with reference to FIG. 3A and 3B are schematic views for explaining a modified example of the dipole antenna of the MIMO antenna device of the present invention, FIG. 3A is a top view, FIG. 3B is a partial cross-sectional front view, and FIG. c) is a side view. In the figure, the parts having the same reference numerals as those in FIG. 1 represent the same objects. The dipole antenna of the illustrated example is basically based on the bowtie antenna as shown in FIG. As shown in FIG. 3, the first bowtie antenna 10'and the second bowtie antenna 20'show an example in which the above-mentioned convex elements for adjusting the antenna performance are appropriately combined and deformed. However, the present invention is not limited to this, and any shape may be used as long as it serves as a bowtie antenna in principle.
　この例では、図３（ｂ）に示されるように、第１ボウタイアンテナ１０'は、第１面１２と第２面２２の間の側面に、さらに第１ボウタイアンテナ１０'から延在するアンテナ性能調整用の第１側面エレメント１６を有している。具体的には、一対の第１エレメント１１から基部４の側面に沿って９０度折り曲げられるように第１側面エレメント１６が側面に延在している。同様に、第２ボウタイアンテナ２０'も、第１面１２と第２面２２の間の側面に、第２ボウタイアンテナ２０'から延在するアンテナ性能調整用の第２側面エレメント２６を有している。具体的には、一対の第２エレメント２１から基部４の側面に沿って９０度折り曲げられるように第２側面エレメント２６が側面に延在している。 In this example, as shown in FIG. 3B, the first bowtie antenna 10'is an antenna extending from the first bowtie antenna 10'on the side surface between the first surface 12 and the second surface 22. It has a first side surface element 16 for performance adjustment. Specifically, the first side surface element 16 extends to the side surface so as to be bent 90 degrees from the pair of first element 11 along the side surface of the base portion 4. Similarly, the second bowtie antenna 20'has a second side surface element 26 for adjusting antenna performance extending from the second bowtie antenna 20'on the side surface between the first surface 12 and the second surface 22. There is. Specifically, the second side surface element 26 extends to the side surface so as to be bent 90 degrees along the side surface of the base 4 from the pair of second element 21.
　図示例の第１側面エレメント１６や第２側面エレメント２６は、基部４に設けられた差込部５に差し込まれて固定される例を示した。これにより、一体的に板金加工等で提供されるボウタイアンテナと共に、ダイポールアンテナが基部４に固定されることになる。 An example is shown in which the first side surface element 16 and the second side surface element 26 in the illustrated example are inserted into and fixed to the insertion portion 5 provided in the base portion 4. As a result, the dipole antenna is fixed to the base 4 together with the bowtie antenna integrally provided by sheet metal processing or the like.
　このように側面のスペースを用いることで、ボウタイアンテナのアンテナ長を、側面エレメント１６，２６を用いて延ばすことが可能となる。これにより、ダイポールアンテナの下限周波数付近のアンテナ性能を調整することが可能となる。なお、第１側面エレメント１６や第２側面エレメント２６は、上述のようにボウタイアンテナを９０度折り曲げて形成するものには限られない。例えば、ＭＩＭＯアンテナ装置を覆うケース等の内側や外側に側面エレメントを配置し、側面エレメントをボウタイアンテナに電気的に接続するように構成されるものであっても良い。 By using the side space in this way, it is possible to extend the antenna length of the bowtie antenna by using the side elements 16 and 26. This makes it possible to adjust the antenna performance near the lower limit frequency of the dipole antenna. The first side surface element 16 and the second side surface element 26 are not limited to those formed by bending the bowtie antenna by 90 degrees as described above. For example, the side element may be arranged inside or outside the case covering the MIMO antenna device, and the side element may be electrically connected to the bowtie antenna.
　また、図３（ａ）に示されるように、第２ダイポールアンテナ２０は、第２面２２から第１面１２へ延在する第２折り返しエレメント部２７を有するように構成しても良い。第２折り返しエレメント部２７は、第２面２２上に配置される一対の第２エレメント２１をさらに第１面１２上に延長するように構成されている。なお、第２折り返しエレメント部２７は、適宜アンテナ性能を調整できる形状であれば良く、例えば図示のように一方がＬ字型で他方が三角型等であっても良いし、同じ形状であっても良い。また、図３（ｃ）に示される通り、第２折り返しエレメント部２７と第２エレメント２１は、第２側面接続部２８により電気的に接続されれば良い。第２側面接続部２８は、導電性の板状体を用いて第２エレメント２１や第２折り返しエレメント部２７と一体的に板金加工等で提供されれば良い。また、スルーホールや配線等を用いて第２折り返しエレメント部２７と第２エレメント２１が接続されても良い。 Further, as shown in FIG. 3A, the second dipole antenna 20 may be configured to have a second folded element portion 27 extending from the second surface 22 to the first surface 12. The second folded element portion 27 is configured to further extend the pair of second elements 21 arranged on the second surface 22 onto the first surface 12. The second folded element portion 27 may have a shape that allows the antenna performance to be adjusted as appropriate. For example, as shown in the figure, one may be L-shaped and the other may be triangular, or the same shape. Is also good. Further, as shown in FIG. 3C, the second folded element portion 27 and the second element 21 may be electrically connected by the second side surface connecting portion 28. The second side surface connecting portion 28 may be provided by sheet metal processing or the like integrally with the second element 21 and the second folded element portion 27 using a conductive plate-shaped body. Further, the second folded element portion 27 and the second element 21 may be connected by using a through hole, wiring, or the like.
　同様に、第１ダイポールアンテナ１０も、第１面１２から第２面２２へ延在する第１折り返しエレメント部１７をさらに有するように構成しても良い。第１折り返しエレメント部１７は、第１面１２上に配置される一対の第１エレメント１１をさらに第２面２２上に延長するように構成されている。なお、第１折り返しエレメント部１７も、適宜アンテナ性能を調整できる形状であれば良く、例えば図示のように一方がＬ字型で他方が三角型等であっても良いし、同じ形状であっても良い。第１折り返しエレメント部１７と第１エレメント１１も、同様に第１側面接続部１８により電気的に接続されれば良い。 Similarly, the first dipole antenna 10 may be configured to further include a first folded element portion 17 extending from the first surface 12 to the second surface 22. The first folded element portion 17 is configured to further extend the pair of first elements 11 arranged on the first surface 12 onto the second surface 22. The first folded element portion 17 may also have a shape that allows the antenna performance to be adjusted as appropriate. For example, as shown in the figure, one may be L-shaped and the other may be triangular, or the same shape. Is also good. Similarly, the first folded element portion 17 and the first element 11 may be electrically connected by the first side surface connecting portion 18.
　そして、図示の通り、第２折り返しエレメント部２７は、第１面１２内で第１ダイポールアンテナ１０'の配置されていないエリアに配置されれば良い。同様に、第１折り返しエレメント部１７も、第２面２２内で第２ダイポールアンテナ２０'の配置されていないエリアに配置されれば良い。このように配置されることで、ケース１内の限られたエリアを効率良く利用しながら、ダイポールアンテナの下限周波数付近のアンテナ性能を調整することが可能となる。 Then, as shown in the drawing, the second folded element portion 27 may be arranged in the area where the first dipole antenna 10'is not arranged in the first surface 12. Similarly, the first folded element portion 17 may also be arranged in the area where the second dipole antenna 20'is not arranged in the second surface 22. By arranging in this way, it is possible to adjust the antenna performance near the lower limit frequency of the dipole antenna while efficiently utilizing the limited area in the case 1.
　また、第１折り返しエレメント部１７や第２折り返しエレメント部２７も、基部４の側面に設けられる差込部５に適宜差し込まれて固定されても良い。 Further, the first folded element portion 17 and the second folded element portion 27 may also be appropriately inserted and fixed to the insertion portion 5 provided on the side surface of the base portion 4.
　本発明のＭＩＭＯアンテナ装置は、第１面１２と第２面２２のアンテナを、完全に対称に形成することが可能であるため、２ポート（２つのアンテナ）が不要な場合、一方のアンテナを取り外すことで簡易的に１ポートのアンテナ装置とすることも可能である。また、例えば、上述の図示例では、ＭＩＭＯアンテナ装置は、２つのダイポールアンテナを用いた例を説明したが、本発明はこれに限定されず、さらにダイポールアンテナを追加し、エレメントの主要部が重ならないように交差して配置することで、アンテナ間の干渉を抑制しながらより多くのポート数とすることも可能である。 In the MIMO antenna device of the present invention, the antennas on the first surface 12 and the second surface 22 can be formed completely symmetrically. Therefore, when two ports (two antennas) are not required, one antenna is used. It is also possible to easily make a 1-port antenna device by removing it. Further, for example, in the above illustrated example, the example in which the MIMO antenna device uses two dipole antennas has been described, but the present invention is not limited to this, and a dipole antenna is further added, and the main part of the element is heavy. It is also possible to increase the number of ports while suppressing interference between antennas by arranging them so as to intersect each other.
　図４は、本発明のＭＩＭＯアンテナ装置の周波数に対するアイソレーション特性のグラフである。図中、横軸が周波数であり、縦軸がアイソレーションである。また、グレー線が所望スペックであり、これより低いと良好なアイソレーションであると考えられるレベルである。図示の通り、本発明のＭＩＭＯアンテナ装置は、広帯域に良好なアイソレーション特性を確保できていることが分かる。 FIG. 4 is a graph of isolation characteristics with respect to frequency of the MIMO antenna device of the present invention. In the figure, the horizontal axis is frequency and the vertical axis is isolation. Further, the gray line is a desired specification, and if it is lower than this, it is a level considered to be good isolation. As shown in the figure, it can be seen that the MIMO antenna device of the present invention can secure good isolation characteristics over a wide band.
　なお、本発明のＭＩＭＯアンテナ装置は、上述の図示例にのみ限定されるものではなく、本発明の要旨を逸脱しない範囲内において種々変更を加え得ることは勿論である。 It should be noted that the MIMO antenna device of the present invention is not limited to the above illustrated example, and it goes without saying that various modifications can be made without departing from the gist of the present invention.
　１　　ケース
　２　　同軸ケーブル
　３　　同軸ケーブル
　４　　基部
　５　　差込部
　１０　　第１ダイポールアンテナ
　１０'　　第１ボウタイアンテナ
　１１　　第１エレメント
　１２　　第１面
　１３　　第１給電部
　１４　　第１基板
　１５　　第１用凸状エレメント
　１６　　第１側面エレメント
　１７　　第１折り返しエレメント部
　１８　　第１側面接続部
　２０　　第２ダイポールアンテナ
　２０'　　第２ボウタイアンテナ
　２１　　第２エレメント
　２２　　第２面
　２３　　第２給電部
　２４　　第２基板
　２５　　第２用凸状エレメント部
　２６　　第２側面エレメント
　２７　　第２折り返しエレメント部
　２８　　第２側面接続部 1 Case 2 Coaxial cable 3 Coaxial cable 4 Base 5 Insertion part 10 1st dipole antenna 10'1st bow tie antenna 11 1st element 12 1st surface 13 1st feeding part 14 1st board 15 1st convex element 16 1st side element 17 1st folded element part 18 1st side connection part 20 2nd dipole antenna 20'2nd bow tie antenna 21 2nd element 22 2nd surface 23 2nd feeding part 24 2nd board 25 2nd convex Element part 26 2nd side element 27 2nd folded element part 28 2nd side connection part

Claims (10)

  1. 　空間多重伝送を行うＭＩＭＯアンテナ装置であって、該ＭＩＭＯアンテナ装置は、
    　第１給電部に接続され第１面上に配置される一対の第１エレメントからなる第１ダイポールアンテナと、
    　第２給電部に接続され第１面に対向する第２面上に配置される一対の第２エレメントからなる第２ダイポールアンテナであって、該第２ダイポールアンテナが、上面視で第２給電部が第１給電部と概ね重なるように配置されると共に、一対の第２エレメントの主要部が一対の第１エレメントの主要部と重ならないように、第１ダイポールアンテナに交差して配置される、第２ダイポールアンテナと、
    　を具備することを特徴とするＭＩＭＯアンテナ装置。     A MIMO antenna device that performs spatial multiplex transmission, and the MIMO antenna device is
    A first dipole antenna composed of a pair of first elements connected to the first feeding unit and arranged on the first surface,
    A second dipole antenna composed of a pair of second elements connected to the second feeding unit and arranged on the second surface facing the first surface, and the second dipole antenna is the second feeding unit in a top view. Is arranged so as to substantially overlap with the first feeding portion, and is arranged so as to intersect the first dipole antenna so that the main portion of the pair of second elements does not overlap with the main portion of the pair of first elements. 2nd dipole antenna and
    A MIMO antenna device comprising.
  2. 　請求項１に記載のＭＩＭＯアンテナ装置において、前記第１給電部及び第２給電部にそれぞれ接続される同軸ケーブルが、第１面と第２面の間にそれぞれ配線されることを特徴とするＭＩＭＯアンテナ装置。 The MIMO antenna device according to claim 1, wherein the coaxial cables connected to the first power feeding unit and the second feeding unit are respectively wired between the first surface and the second surface. Antenna device.
  3. 　請求項１又は請求項２に記載のＭＩＭＯアンテナ装置において、前記第１ダイポールアンテナは、第１ボウタイアンテナからなり、第２ダイポールアンテナは、第２ボウタイアンテナからなることを特徴とするＭＩＭＯアンテナ装置。 The MIMO antenna device according to claim 1 or 2, wherein the first dipole antenna is composed of a first bow tie antenna, and the second dipole antenna is composed of a second bow tie antenna.
  4. 　請求項３に記載のＭＩＭＯアンテナ装置において、前記第１ボウタイアンテナは、第１ボウタイアンテナから第１面上に延在するアンテナ性能調整用の第１用凸状エレメント部を有することを特徴とするＭＩＭＯアンテナ装置。 The MIMO antenna device according to claim 3, wherein the first bowtie antenna has a first convex element portion for adjusting antenna performance extending from the first bowtie antenna on the first surface. MIMO antenna device.
  5. 　請求項３又は請求項４に記載のＭＩＭＯアンテナ装置において、前記第２ボウタイアンテナは、第２ボウタイアンテナから第２面上に延在するアンテナ性能調整用の第２用凸状エレメント部を有することを特徴とするＭＩＭＯアンテナ装置。 In the MIMO antenna device according to claim 3 or 4, the second bowtie antenna has a second convex element portion for adjusting antenna performance extending from the second bowtie antenna on the second surface. A MIMO antenna device characterized by.
  6. 　請求項３乃至請求項５の何れかに記載のＭＩＭＯアンテナ装置において、前記第１ボウタイアンテナ及び／又は第２ボウタイアンテナは、第１面と第２面の間の側面に第１ボウタイアンテナ及び／又は第２ボウタイアンテナから延在するアンテナ性能調整用の側面エレメント部を有することを特徴とするＭＩＭＯアンテナ装置。 In the MIMO antenna device according to any one of claims 3 to 5, the first bow tie antenna and / or the second bow tie antenna has a first bow tie antenna and / or a first bow tie antenna on a side surface between the first surface and the second surface. Alternatively, a MIMO antenna device having a side element portion for adjusting antenna performance extending from the second bow tie antenna.
  7. 　請求項１乃至請求項６の何れかに記載のＭＩＭＯアンテナ装置において、
    　前記第１ダイポールアンテナは、第１面から第２面へ延在する第１折り返しエレメント部を有し、
    　前記第２ダイポールアンテナは、第２面から第１面へ延在する第２折り返しエレメント部を有し、
    　前記第１折り返しエレメント部は、第２面内で第２ダイポールアンテナの配置されていないエリアに配置され、
    　前記第２折り返しエレメント部は、第１面内で第１ダイポールアンテナの配置されていないエリアに配置される、
    　ことを特徴とするＭＩＭＯアンテナ装置。     In the MIMO antenna device according to any one of claims 1 to 6.
    The first dipole antenna has a first folded element portion extending from the first surface to the second surface.
    The second dipole antenna has a second folded element portion extending from the second surface to the first surface.
    The first folded element portion is arranged in the second surface in an area where the second dipole antenna is not arranged.
    The second folded element portion is arranged in the area where the first dipole antenna is not arranged in the first surface.
    A MIMO antenna device characterized by this.
  8. 　請求項１乃至請求項７の何れかに記載のＭＩＭＯアンテナ装置であって、さらに、前記第１面と第２面の間に配置され、第１給電部を有する第１基板と、第２給電部を有する第２基板と、を有することを特徴とするＭＩＭＯアンテナ装置。 The MIMO antenna device according to any one of claims 1 to 7, further comprising a first substrate which is arranged between the first surface and the second surface and has a first power feeding unit, and a second power feeding unit. A MIMO antenna device comprising a second substrate having a portion.
  9. 　請求項８に記載のＭＩＭＯアンテナ装置において、前記第１基板と第２基板は、１枚の基板の表面と裏面からなることを特徴とするＭＩＭＯアンテナ装置。 The MIMO antenna device according to claim 8, wherein the first substrate and the second substrate are composed of a front surface and a back surface of one substrate.
  10. 　請求項１乃至請求項９の何れかに記載のＭＩＭＯアンテナ装置において、前記第１ダイポールアンテナ及び第２ダイポールアンテナは、直方体のケース内で、対角線上にそれぞれ配置されることを特徴とするＭＩＭＯアンテナ装置。 In the MIMO antenna device according to any one of claims 1 to 9, the first dipole antenna and the second dipole antenna are arranged diagonally in a rectangular parallelepiped case. apparatus.
PCT/JP2020/040465 2019-10-29 2020-10-28 Mimo antenna device WO2021085483A1 (en)

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Citations (6)

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Publication number Priority date Publication date Assignee Title
JPH1197915A (en) * 1997-06-30 1999-04-09 Sony Internatl Europ Gmbh Phase array antenna
WO2005112196A1 (en) * 2004-05-18 2005-11-24 Telefonaktiebolaget Lm Ericsson (Publ) Closely packed dipole array antenna
JP2006333194A (en) * 2005-05-27 2006-12-07 Toppan Forms Co Ltd Antenna member and its impedance adjusting method
JP2009518954A (en) * 2005-12-06 2009-05-07 シンボル テクノロジーズ， インコーポレイテッド System integration of RFID technology and MIMO technology
JP2010161959A (en) * 2009-01-14 2010-07-29 Mitsubishi Electric Corp Earmark rfid tag for animal
JP2011066837A (en) * 2009-09-18 2011-03-31 Yazaki Corp Bow-tie antenna

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH1197915A (en) * 1997-06-30 1999-04-09 Sony Internatl Europ Gmbh Phase array antenna
WO2005112196A1 (en) * 2004-05-18 2005-11-24 Telefonaktiebolaget Lm Ericsson (Publ) Closely packed dipole array antenna
JP2006333194A (en) * 2005-05-27 2006-12-07 Toppan Forms Co Ltd Antenna member and its impedance adjusting method
JP2009518954A (en) * 2005-12-06 2009-05-07 シンボル テクノロジーズ， インコーポレイテッド System integration of RFID technology and MIMO technology
JP2010161959A (en) * 2009-01-14 2010-07-29 Mitsubishi Electric Corp Earmark rfid tag for animal
JP2011066837A (en) * 2009-09-18 2011-03-31 Yazaki Corp Bow-tie antenna

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