JPH11112230A - Modified yagi-antenna having directivity in plural directions - Google Patents
Modified yagi-antenna having directivity in plural directionsInfo
- Publication number
- JPH11112230A JPH11112230A JP9309173A JP30917397A JPH11112230A JP H11112230 A JPH11112230 A JP H11112230A JP 9309173 A JP9309173 A JP 9309173A JP 30917397 A JP30917397 A JP 30917397A JP H11112230 A JPH11112230 A JP H11112230A
- Authority
- JP
- Japan
- Prior art keywords
- antenna
- directivity
- yagi
- directions
- sensitivity
- 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.)
- Pending
Links
Landscapes
- Aerials With Secondary Devices (AREA)
- Variable-Direction Aerials And Aerial Arrays (AREA)
- Details Of Aerials (AREA)
- Radio Transmission System (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、電波を送り、又は受け
るためのアンテナに関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an antenna for transmitting or receiving radio waves.
【０００２】[0002]
【図１】は従来の八木型アンテナの基本構成である。八
木型アンテナは感度が良い（利得が高い）代わりに、実
用上、単一の方向にしか指向性を持たず、その方向にし
か送信又は受信できない。FIG. 1 is a basic configuration of a conventional Yagi-type antenna. The Yagi-type antenna has high sensitivity (high gain) but practically has directivity only in a single direction, and can transmit or receive only in that direction.
【０００３】[0003]
【発明が解決しようとする課題】八木型アンテナでも、
使用目的によっては複数の方向に指向性を持ち、かつそ
れぞれの方向に、ある程度の利得があれば便利である。SUMMARY OF THE INVENTION Even with a Yagi type antenna,
Depending on the purpose of use, it is convenient to have directivity in a plurality of directions and to have a certain amount of gain in each direction.
【０００４】[0004]
【図２】のように、一基の八木アンテナに、複数組の導
波器を設ける。As shown in FIG. 2, a plurality of sets of directors are provided in one Yagi antenna.
【０００５】[0005]
【作用】複数方向に、実用上の指向性を持ち、各方向に
相当の利得を持つようになる。The present invention has practical directivity in a plurality of directions, and has a considerable gain in each direction.
【０００６】[0006]
【図２】は本発明の変形八木アンテナの基本構成であ
る。このアンテナは、従来の八木型アンテナと同様に、
水平使用又は垂直使用が可能である。さらに、これらを
組み合わせたクロス八木やスタック使用などの応用が可
能である。FIG. 2 shows a basic configuration of a modified Yagi antenna according to the present invention. This antenna is similar to the conventional Yagi antenna,
Horizontal or vertical use is possible. Furthermore, applications such as the use of cross-Yagi and stacks combining these are possible.
【図３】とFIG. 3 and
【図４】は本発明の実施例である。以下FIG. 4 is an embodiment of the present invention. Less than
【図３】の実施例について説明する。FIG. 3 illustrates an embodiment of FIG.
【図３】は[Fig. 3]
【図２】の変形八木アンテナ４基を角度をずらして、水
平に配置し、車載用テレビアンテナシステムを構成した
例である。車載用テレビアンテナシステムとしては、ダ
イパシティーアンテナシステムが広く用いられている。
従来のものは、アンテナ本体が、ロッドアンテナ状のも
のが多く、原理的に利得が低い（感度がよくない）。ま
た、放送は水平偏波が多いが、実際にはアンテナはほと
んど垂直的に使用され（垂直偏波という）、偏波面が合
わない（これも感度低下の原因）などの欠点があり、放
送局や中継局が近くにある市街地ではよいが、そうでな
い郊外では使いにくい面があった。FIG. 2 shows an example in which four modified Yagi antennas of FIG. 2 are horizontally arranged at different angles to constitute a vehicle-mounted TV antenna system. As an in-vehicle television antenna system, a diversity antenna system is widely used.
Conventional antennas often have a rod antenna-like antenna body, and have a low gain (poor sensitivity) in principle. Broadcasting also has many horizontal polarizations, but in practice, antennas are used almost vertically (called vertical polarization), and there are drawbacks such as inconsistent polarization planes (this also causes a decrease in sensitivity). It is good in the city area where relay stations and relay stations are nearby, but it is difficult to use in suburbs where it is not.
【図３】の実施例は、このような欠点の軽減を目的とす
るものである。The embodiment of FIG. 3 aims at alleviating such disadvantages.
【０００７】[0007]
【発明の効果】本発明の変形八木アンテナは、複数方向
に指向性が得られる。また、それぞれの方向について、
原理的にある程度の利得も期待できる。従ってこれをダ
イパシティーアンテナシステムに組み込むと、従来のも
のに比べ、利得が高い、偏波面が一致する、従って感度
が高くなるという効果が得られる。また、本発明の変形
八木アンテナを垂直に使用する場合、さらに多数の方向
に指向性を得ることができ、それぞれの方向に相当の利
得が期待できる。いずれの場合も、アンテナ本体を回転
させずに、実用上の感度を得ることができる。特に必要
があって、アンテナを回転させる場合も、わずかに回転
させるだけで、必要な方向に感度を得ることができるの
で、操作の時間を短縮することができる。従って、自動
車や船舶などの移動体への応用に好適である。According to the modified Yagi antenna of the present invention, directivity can be obtained in a plurality of directions. Also, for each direction,
In principle, some gain can also be expected. Therefore, when this is incorporated into a diversity antenna system, effects are obtained in which the gain is higher, the polarization planes coincide with each other, and the sensitivity is higher than in the conventional antenna. Further, when the modified Yagi antenna of the present invention is used vertically, directivity can be obtained in more directions, and considerable gain can be expected in each direction. In any case, practical sensitivity can be obtained without rotating the antenna body. Especially when the antenna needs to be rotated, the sensitivity can be obtained in a required direction only by slightly rotating the antenna, so that the operation time can be reduced. Therefore, it is suitable for application to mobile objects such as automobiles and ships.
【図１】通常の八木アンテナの基本構成Fig. 1 Basic configuration of a normal Yagi antenna
【図２】本発明の変形八木アンテナの基本構成FIG. 2 is a basic configuration of a modified Yagi antenna according to the present invention.
【図３】本発明の変形八木アンテナを水平に使用する実
施例FIG. 3 shows an embodiment in which the modified Yagi antenna of the present invention is used horizontally.
【図４】本発明の変形八木アンテナを垂直に使用する実
施例FIG. 4 shows an embodiment in which the modified Yagi antenna of the present invention is used vertically.
Claims (1)
ナ1. A modified Yagi antenna having directivity in a plurality of directions.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP9309173A JPH11112230A (en) | 1997-10-06 | 1997-10-06 | Modified yagi-antenna having directivity in plural directions |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP9309173A JPH11112230A (en) | 1997-10-06 | 1997-10-06 | Modified yagi-antenna having directivity in plural directions |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH11112230A true JPH11112230A (en) | 1999-04-23 |
Family
ID=17989819
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP9309173A Pending JPH11112230A (en) | 1997-10-06 | 1997-10-06 | Modified yagi-antenna having directivity in plural directions |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH11112230A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2019136271A1 (en) * | 2018-01-05 | 2019-07-11 | Wispry, Inc. | Hybrid high gain antenna systems, devices, and methods |
-
1997
- 1997-10-06 JP JP9309173A patent/JPH11112230A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2019136271A1 (en) * | 2018-01-05 | 2019-07-11 | Wispry, Inc. | Hybrid high gain antenna systems, devices, and methods |
| US10886611B2 (en) | 2018-01-05 | 2021-01-05 | Wispry, Inc. | Hybrid high gain antenna systems, devices, and methods |
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