JP2001223517A - Frequency sharing antenna - Google Patents
Frequency sharing antennaInfo
- Publication number
- JP2001223517A JP2001223517A JP2000031522A JP2000031522A JP2001223517A JP 2001223517 A JP2001223517 A JP 2001223517A JP 2000031522 A JP2000031522 A JP 2000031522A JP 2000031522 A JP2000031522 A JP 2000031522A JP 2001223517 A JP2001223517 A JP 2001223517A
- Authority
- JP
- Japan
- Prior art keywords
- conductor
- antenna
- frequency
- plate
- conductor piece
- 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.)
- Granted
Links
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- Variable-Direction Aerials And Aerial Arrays (AREA)
- Waveguide Aerials (AREA)
- Details Of Aerials (AREA)
Abstract
Description
【0001】[0001]
【発明の属する技術分野】この発明は例えば移動通信に
おける不感地対策用の天井などに取付けられる対移動局
用アンテナとして利用され、特に全体として平面状の形
状をしていながら2周波数に共振する、つまり2周波数
帯に共用される周波数共用アンテナに関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is used, for example, as an antenna for a mobile station mounted on a ceiling or the like for measures against a blind spot in mobile communications. In particular, the antenna resonates at two frequencies while having a planar shape as a whole. That is, the present invention relates to a frequency sharing antenna shared by two frequency bands.
【0002】[0002]
【従来の技術】従来において天井などに取付けられ、対
移動局用アンテナとして平面形状ものが用いられてい
た。即ち、図7に示すように、方形地板11の中心部に
モノポールアンテナ12が立てられ、モノポールアンテ
ナ12の突出端上に方形導体板13が地板11と平行
に、その中心で装着され、モノポールアンテナ12の中
間部はインピーダンス整合用導体14で地板11に短絡
され、地板11のモノポールアンテナ12と反対側に給
電部15が取付けられている。なお地板11の形状寸法
は使用波長に対し、十分大きい。2. Description of the Related Art Conventionally, a planar antenna is mounted on a ceiling or the like and used as an antenna for a mobile station. That is, as shown in FIG. 7, the monopole antenna 12 is erected at the center of the rectangular ground plate 11, and the rectangular conductor plate 13 is mounted on the protruding end of the monopole antenna 12 in parallel with the ground plate 11 at the center thereof, An intermediate portion of the monopole antenna 12 is short-circuited to the ground plane 11 by a conductor 14 for impedance matching, and a feeder 15 is attached to the ground plane 11 on the side opposite to the monopole antenna 12. The shape and size of the base plate 11 are sufficiently large with respect to the wavelength used.
【0003】このように導体板13を取付けることによ
り容量成分が装荷され、モノポールアンテナ12の長さ
を4分の1使用波長よりも短かくすることができ、例え
ばモノポールアンテナ12を70%に短縮することがで
き、全体としての高さを低くし、かつ平面状アンテナと
することができる。例えば地板11を室内の天井側とし
て取付けられ、天井よりの突出が目立たないようにされ
る。なお、このように低姿勢形状としたことにより、イ
ンピーダンスが数Ωと小さくなるため、少なくとも1
本、好ましくは2本のインピーダンス整合用導体14、
いわゆるトラップ回路を設けることにより、給電線の5
0Ωとインピーダンス整合するようにされている。By mounting the conductor plate 13 in this manner, a capacitance component is loaded, and the length of the monopole antenna 12 can be made shorter than a quarter of the used wavelength. , The overall height can be reduced, and a planar antenna can be obtained. For example, the base plate 11 is mounted on the ceiling side of the room, so that the protrusion from the ceiling is not noticeable. In addition, by adopting such a low-profile shape, the impedance is reduced to several Ω.
, Preferably two impedance matching conductors 14,
By providing a so-called trap circuit, the 5
The impedance is matched to 0Ω.
【0004】この平面状アンテナを2.0GHz帯で使
用する場合は、方形導体板13の各辺の長さW1 とW2
を共に0.11λ(λは2.0GHzの波長)、モノポ
ールアンテナ12の高さH1 を0.10λとして、無指
向性アンテナが実現される。When the planar antenna is used in the 2.0 GHz band, the lengths W 1 and W 2 of each side of the rectangular conductor plate 13 are set.
Is 0.11λ (λ is a wavelength of 2.0 GHz), and the height H 1 of the monopole antenna 12 is 0.10λ, thereby realizing an omnidirectional antenna.
【0005】[0005]
【発明が解決しようとする課題】従来において、移動無
線の不感地対策のために二つの周波数帯が用いられ、こ
の場合のアンテナとしては図8に示すように、第1周波
数帯用の図7に示した平面状アンテナ21と、第2周波
数帯用の図7に示した平面状アンテナ22とが地板11
を共通にして設けたものが用いられている。このような
アンテナ装置は、設置空間が大きくなる欠点があった。Conventionally, two frequency bands are used in order to cope with blind spots of mobile radio. In this case, as an antenna in this case, as shown in FIG. And the planar antenna 22 for the second frequency band shown in FIG.
Are commonly used. Such an antenna device has a drawback that the installation space becomes large.
【0006】[0006]
【課題を解決するための手段】この発明によれば、従来
の第1周波数に共振する平面状アンテナに対し、その地
板と反対側において、平板状導体とほぼ平行し、これと
一部が短絡された導体片が設けられ、第1周波数より低
い第2周波数でも共振が生じるように構成される。According to the present invention, a conventional planar antenna which resonates at a first frequency is substantially parallel to a flat conductor on the side opposite to the ground plane, and a part thereof is short-circuited. The conductor piece is provided so that resonance occurs even at a second frequency lower than the first frequency.
【0007】[0007]
【発明の実施の形態】図1にこの発明の実施例を示し、
図7と対応する部分に同一番号を付けて重複説明を省略
する。つまり図7に示した第1周波数に共振する平面状
アンテナに対し、その地板11と反対側において、地板
11と平行した導体片31として方形ループ導体片がそ
の一部を導体板13と短絡して設けられる。方形ループ
導体片31はこの例ではほぼ正方形状であり、かつ、モ
ノポールアンテナ12の中心線を中心として、正方形状
導体板13に対し、角度的にほぼ45度回転されて、互
いに対向されている。またループ導体片31の一辺の中
点が正方形状導体板13の1つのコーナ部の近くに接続
導体32にて接続されると共にループ導体片31が導体
板13に支持される。FIG. 1 shows an embodiment of the present invention.
Parts corresponding to those in FIG. 7 are denoted by the same reference numerals, and redundant description is omitted. That is, in the planar antenna resonating at the first frequency shown in FIG. 7, on the side opposite to the ground plane 11, a rectangular loop conductor piece as a conductor piece 31 parallel to the ground plane 11 partially short-circuits with the conductor plate 13. Provided. In this example, the square loop conductor pieces 31 have a substantially square shape, and are rotated by about 45 degrees with respect to the square conductor plate 13 about the center line of the monopole antenna 12 so as to face each other. I have. In addition, the midpoint of one side of the loop conductor piece 31 is connected to one corner portion of the square conductor plate 13 by a connection conductor 32 and the loop conductor piece 31 is supported by the conductor plate 13.
【0008】この構成によれば、モノポールアンテナ1
2及び導体板13により決る共振周波数f1 で従来と同
様にアンテナとして動作すると共に、モノポールアンテ
ナ12及びループ導体片31により決る共振周波数f2
でアンテナとして動作し、つまり2周波共振アンテナと
して動作する。この場合、ループ導体片31が導体板1
3と結合すると2周波共振アンテナとして動作しない点
から、これらの結合を小さくする必要がある。この点か
ら導体片31は平板導体でもよいが、ループ導体が好ま
しく、またこの方が、アンテナ全体としての高さ、つま
りモノポールアンテナ12の延長方向の長さを小さくす
る点からも好ましい。更に導体片31と導体板13は結
合を小とする点からは互いに対向しないように、地板1
1と平行な方向においてずらした方がよいが、全体とし
てのアンテナ面積を小さくする点からは導体片31を方
形ループ導体片とし、かつ、図1に示したように、導体
板13と対向するようにした方がよく、この場合結合を
小さくする点から、角度的にずらした方がよい。According to this configuration, the monopole antenna 1
2 and the conductor plate 13 to operate as an antenna at the resonance frequency f 1 as in the prior art, and the resonance frequency f 2 determined by the monopole antenna 12 and the loop conductor piece 31.
Operate as an antenna, that is, operate as a two-frequency resonance antenna. In this case, the loop conductor piece 31 is
It is necessary to reduce these couplings since they do not operate as a two-frequency resonance antenna when they are coupled with the antenna 3. From this point, the conductor piece 31 may be a flat conductor, but is preferably a loop conductor, and is more preferable in terms of reducing the height of the entire antenna, that is, the length of the monopole antenna 12 in the extending direction. In addition, the conductor plate 31 and the conductor plate 13 are not opposed to each other from the point
Although it is better to shift in the direction parallel to 1, the conductor piece 31 is a rectangular loop conductor piece and is opposed to the conductor plate 13 as shown in FIG. 1 from the viewpoint of reducing the antenna area as a whole. In this case, the angle should be shifted from the viewpoint of reducing the coupling.
【0009】以下に具体例を示す。導体板13を各辺W
1 =W2 を0.11λ1、導体板13の地板11より高
さH1を0.10λ1 (λ1 は2.0GHzの波長)と
し、ループ導体片31の外側辺W3 =W5 を0.17λ
2 、内側辺W4 を0.15λ 2 、W6 を0.12λ2 、
導体片31の地板11よりの高さH2 を0.15λ
2(λ2 は1.5GHzの波長)とした。この場合のリ
ターンロス周波数特性は図2に示すようになった、これ
より1.492GHzで−25.04dB、2.127
GHzで−19.88dBとほぼ1.5GHzと2.0
GHzで共振現象が生じた。つまりこのアンテナは2周
波共用アンテナとして動作することが確認された。また
1.492GHzにおける水平面内指向特性を図3に、
垂直面内指向特性を図4に、2.127GHzにおける
水平面内指向特性を図5に、垂直面内指向特性を図6に
それぞれ示す。これらより、1.492GHz、2.1
27GHzでの水平面内指向特性は共にほぼ無指向性で
あり、垂直面内指向特性は8字特性であるがその半値幅
が共に広いものであることが確認できた。A specific example will be described below. The conductor plate 13 is placed on each side W
1= WTwo0.11λ1, Higher than the ground plane 11 of the conductor plate 13
H10.10λ1(Λ1Is the wavelength of 2.0 GHz)
And the outer side W of the loop conductor piece 31Three= WFiveIs 0.17λ
Two, Inside side WFour0.15λ Two, W6Is 0.12λTwo,
Height H of conductor piece 31 above ground plate 11Two0.15λ
Two(ΛTwoIs a wavelength of 1.5 GHz). In this case,
Turn loss frequency characteristics are as shown in Fig. 2.
-25.04 dB at 1.492 GHz, 2.127
-19.88 dB at GHz and almost 1.5 GHz and 2.0
A resonance phenomenon occurred at GHz. In other words, this antenna has two laps
It has been confirmed that the antenna operates as a wave sharing antenna. Also
FIG. 3 shows directional characteristics in a horizontal plane at 1.492 GHz.
FIG. 4 shows the directional characteristics in the vertical plane at 2.127 GHz.
Fig. 5 shows the directional characteristics in the horizontal plane, and Fig. 6 shows the directional characteristics in the vertical plane.
Shown respectively. From these, 1.492 GHz, 2.1
The directional characteristics in the horizontal plane at 27 GHz are almost omnidirectional.
Yes, the directional characteristic in the vertical plane is a figure-eight characteristic, but its half-value width
Were both broad.
【0010】なお、導体板13の高さH1 を固定して、
ループ導体片31を導体板13に近づけると、1.5G
Hz付近の共振特性が鋭くなるが、2.0GHz付近の
共振特性は弱くなり、逆に導体片31を導体板13から
離すと、1.5GHz付近の共振特性が弱くなり、2.
0GHz付近の共振特性が強くなる。また導体片31の
面積を大きくすると、低い方の共振周波数が低下し、導
体板13の面積を小さくすると高い方の共振周波数が高
くなる。導体片31と導体板13との接続点は導体板1
3の任意の点でよい。導体板13と導体片31との間に
高周波損失が小さい誘電体板33を介在させ、誘導体板
33により導体片31を導体板13上に支持させること
もできる。The height H 1 of the conductor plate 13 is fixed,
When the loop conductor piece 31 is brought close to the conductor plate 13, 1.5 G
Although the resonance characteristic around 1 Hz becomes sharp, the resonance characteristic around 2.0 GHz becomes weaker. On the contrary, when the conductor piece 31 is separated from the conductor plate 13, the resonance characteristic around 1.5 GHz becomes weaker.
The resonance characteristics around 0 GHz become stronger. When the area of the conductor piece 31 is increased, the lower resonance frequency is reduced, and when the area of the conductor plate 13 is reduced, the higher resonance frequency is increased. The connection point between the conductor piece 31 and the conductor plate 13 is the conductor plate 1
Any three points may be used. A dielectric plate 33 having a small high-frequency loss may be interposed between the conductor plate 13 and the conductor piece 31, and the conductor piece 31 may be supported on the conductor plate 13 by the dielectric plate 33.
【0011】[0011]
【発明の効果】以上述べたようにこの発明によれば、2
つの周波数帯に使用できる平面状アンテナを、狭い面
積、つまり小形に構成することができる。As described above, according to the present invention, 2
A planar antenna that can be used for one frequency band can be configured to have a small area, that is, a small size.
【図1】この発明の実施例を示し、Aは平面図、Bは正
面図である。FIG. 1 shows an embodiment of the present invention, wherein A is a plan view and B is a front view.
【図2】この発明の実施例のリターンロス特性を示す
図。FIG. 2 is a diagram showing return loss characteristics of the embodiment of the present invention.
【図3】上記実施例の1.5GHz帯での水平面内指向
特性を示す図。FIG. 3 is a diagram showing a directional characteristic in a horizontal plane in a 1.5 GHz band of the embodiment.
【図4】上記実施例の1.5GHz帯での垂直面内指向
特性を示す図。FIG. 4 is a diagram showing a directional characteristic in a vertical plane in a 1.5 GHz band of the embodiment.
【図5】上記実施例の2.0GHz帯での水平面内指向
特性を示す図。FIG. 5 is a diagram showing a directional characteristic in a horizontal plane in the 2.0 GHz band of the embodiment.
【図6】上記実施例の2.0GHz帯での垂直面内指向
特性を示す図。FIG. 6 is a diagram showing a directional characteristic in a vertical plane in a 2.0 GHz band of the embodiment.
【図7】従来の単一共振平面形アンテナを示し、Aは平
面図、Bは正面図である。FIG. 7 shows a conventional single-resonance planar antenna, where A is a plan view and B is a front view.
【図8】従来の平面形アンテナを用いた2周波共用アン
テナを示す斜視図。FIG. 8 is a perspective view showing a dual-frequency antenna using a conventional planar antenna.
───────────────────────────────────────────────────── フロントページの続き (51)Int.Cl.7 識別記号 FI テーマコート゛(参考) H01Q 21/30 H01Q 21/30 (72)発明者 恵比根 佳雄 東京都港区虎ノ門二丁目10番1号 エヌ・ ティ・ティ移動通信網株式会社内 (72)発明者 新井 宏之 神奈川県横浜市旭区今宿東町615−11 Fターム(参考) 5J021 AA02 AA06 AA13 AB02 AB06 FA32 GA02 HA05 HA10 JA03 5J045 AA03 DA09 FA01 HA06 NA01 5J046 AA04 AA12 AB06 AB13 TA04──────────────────────────────────────────────────の Continued on the front page (51) Int.Cl. 7 Identification symbol FI Theme coat ゛ (Reference) H01Q 21/30 H01Q 21/30 (72) Inventor Yoshio Ebine 2-1-1 Toranomon, Minato-ku, Tokyo N・ Within TTI Mobile Communication Network Co., Ltd. 5J046 AA04 AA12 AB06 AB13 TA04
Claims (4)
上記地板と平行に平板状導体が装着され、上記モノポー
ルアンテナのほぼ中間部と上記地板とを短絡するインピ
ーダンス整合用導体が設けられ、第1周波数で共振する
アンテナ装置において、 上記地板と反対側において上記平板状導体とほぼ平行
し、これと一部において短絡された導体片が設けられ
て、上記第1周波数より低い第2周波数でも共振が生じ
るようにされていることを特徴とする周波数共用アンテ
ナ。At the tip of a monopole antenna with a ground plate,
A flat conductor mounted in parallel with the ground plane, an impedance matching conductor for short-circuiting a substantially middle portion of the monopole antenna and the ground plane is provided, and an antenna device resonating at a first frequency; Wherein a conductor piece substantially parallel to the flat conductor and partially short-circuited therewith is provided so that resonance occurs even at a second frequency lower than the first frequency. antenna.
とを特徴とする請求項1記載の周波数共用アンテナ。2. The frequency sharing antenna according to claim 1, wherein said conductor piece is a loop-shaped conductor piece.
体片は方形ループ状導体片であり、 その方形ループ状導体片と上記方形状平板状導体は、上
記モノポールアンテナを中心として角度的にほぼ45度
離して互いに対向していることを特徴とする請求項2記
載の周波数共用アンテナ。3. The planar conductor has a rectangular shape, the conductor piece is a rectangular loop-shaped conductor piece, and the rectangular loop-shaped conductor piece and the rectangular planar conductor have an angle around the monopole antenna. 3. The frequency sharing antenna according to claim 2, wherein the antennas are substantially 45 degrees apart from each other and face each other.
板が介在されていることを特徴とする請求項1乃至3の
何れかに記載の周波数共用アンテナ。4. The frequency sharing antenna according to claim 1, wherein a dielectric plate is interposed between said conductor piece and said conductor plate.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2000031522A JP3621620B2 (en) | 2000-02-09 | 2000-02-09 | Frequency sharing antenna |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2000031522A JP3621620B2 (en) | 2000-02-09 | 2000-02-09 | Frequency sharing antenna |
Publications (2)
Publication Number | Publication Date |
---|---|
JP2001223517A true JP2001223517A (en) | 2001-08-17 |
JP3621620B2 JP3621620B2 (en) | 2005-02-16 |
Family
ID=18556264
Family Applications (1)
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JP2000031522A Expired - Fee Related JP3621620B2 (en) | 2000-02-09 | 2000-02-09 | Frequency sharing antenna |
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JP (1) | JP3621620B2 (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
KR100607648B1 (en) | 2004-05-03 | 2006-08-01 | (주)에이스안테나 | Patch Antenna of Broadband Having Omnidirectional pattern |
KR100865750B1 (en) * | 2008-04-04 | 2008-10-28 | 주식회사 감마누 | Small type double-band omni antenna |
-
2000
- 2000-02-09 JP JP2000031522A patent/JP3621620B2/en not_active Expired - Fee Related
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
KR100607648B1 (en) | 2004-05-03 | 2006-08-01 | (주)에이스안테나 | Patch Antenna of Broadband Having Omnidirectional pattern |
KR100865750B1 (en) * | 2008-04-04 | 2008-10-28 | 주식회사 감마누 | Small type double-band omni antenna |
Also Published As
Publication number | Publication date |
---|---|
JP3621620B2 (en) | 2005-02-16 |
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