JPH0779189A - Mobile communications system - Google Patents
Mobile communications systemInfo
- Publication number
- JPH0779189A JPH0779189A JP5161054A JP16105493A JPH0779189A JP H0779189 A JPH0779189 A JP H0779189A JP 5161054 A JP5161054 A JP 5161054A JP 16105493 A JP16105493 A JP 16105493A JP H0779189 A JPH0779189 A JP H0779189A
- Authority
- JP
- Japan
- Prior art keywords
- antenna
- mobile station
- reception
- communication system
- transmission
- 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
- Transceivers (AREA)
- Mobile Radio Communication Systems (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は送信と受信とで異なる周
波数を用いて通信を行なう移動通信システムに関し、特
に衛星と移動局とで通信を行なう移動体通信システムに
関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mobile communication system which uses different frequencies for transmission and reception, and more particularly to a mobile communication system which communicates between a satellite and a mobile station.
【０００２】[0002]
【従来の技術】従来の移動通信システムで衛星と移動局
との相互通信及び該移動通信システムに使用される移動
局アンテナを図２及び図３を参照して説明する。ＭＳＡ
Ｔ（移動体衛星通信）システムにおいては、移動局の移
動による位置変更に伴い、常に移動局アンテナのビーム
方向（指向方向）を衛星方向に向けるよう調整する必要
があるため移動局アンテナはできるだけ小型化が望まし
い。従って、小型で、簡単な構造をもつヘリカル型マス
トアンテナが有望視されている。2. Description of the Related Art An intercommunication between a satellite and a mobile station in a conventional mobile communication system and a mobile station antenna used in the mobile communication system will be described with reference to FIGS. MSA
In the T (Mobile Satellite Communication) system, it is necessary to adjust the beam direction (pointing direction) of the mobile station antenna always toward the satellite as the position is changed by the movement of the mobile station. Is desirable. Therefore, a helical-type mast antenna having a small size and a simple structure is considered promising.
【０００３】移動体通信システムでは異なる周波数の送
信及び受信を一本のアンテナで行なっている。図２に示
すように、ヘリカル型マストアンテナはらせん状のヘリ
カルを備えた構造となっている。又、前記ヘリカルの始
点と終点は固定されており、このアンテナの指向性の調
整は、前記らせん状のヘリカルを巻線の周方向にさらに
ねじって１ヘリカルの長さＬを変えたり、ピッチＳを変
えたりして行なわれている。尚、１ヘリカルの長さＬは
図２の矢印のようにヘリカル一巻き分の長さである。In a mobile communication system, transmission and reception of different frequencies are performed by one antenna. As shown in FIG. 2, the helical mast antenna has a structure having a helical spiral. Further, the start point and the end point of the helical are fixed, and the directivity of the antenna is adjusted by further twisting the helical helical in the circumferential direction of the winding to change the length L of one helical or the pitch S. It is done by changing. The length L of one helix is the length of one turn of the helix as indicated by the arrow in FIG.
【０００４】図２のようなヘリカル型マストアンテナを
一本用いて人工衛星を介した通信を行なう場合、送信と
受信で異なる周波数が使用される。この場合、図３に示
すように、例えば送信時に使用される周波数（ＴＸ）が
１．６６ＧＨｚのときのヘリカル型マストアンテナの指
向性は破線のようになり、受信時に使用される周波数
（ＲＸ）が１．５５９ＧＨｚのときのヘリカル型マスト
アンテナの指向性は実線のようになる。When performing communication through an artificial satellite using one helical mast antenna as shown in FIG. 2, different frequencies are used for transmission and reception. In this case, as shown in FIG. 3, for example, the directivity of the helical mast antenna when the frequency (TX) used for transmission is 1.66 GHz is as shown by the broken line, and the frequency (RX) used for reception is shown. Is 1.559 GHz, the directivity of the helical mast antenna is as shown by the solid line.
【０００５】[0005]
【発明が解決しようとする課題】しかし、上述のように
従来の移動通信システムでは、アンテナの指向性が通信
に使用される周波数の変化によって変化するため、両方
の周波数において最大利得の得られる角度を通信対象の
方向とすることが不可能であった。However, as described above, in the conventional mobile communication system, the directivity of the antenna changes due to the change in the frequency used for communication, so that the angle at which the maximum gain is obtained at both frequencies. It was impossible to set the direction of communication target.
【０００６】本発明は、上記問題点を解決し、送信用と
受信用のアンテナをそれぞれ独立して設け、送信と受信
にそれぞれ用いられる周波数において最大利得の得られ
る角度を通信対象の方向として設定可能な移動通信シス
テムを提供することを目的とする。The present invention solves the above-mentioned problems, and an antenna for transmission and an antenna for reception are provided independently of each other, and the angle at which the maximum gain is obtained at the frequencies used for transmission and reception is set as the direction of the communication target. An object is to provide a possible mobile communication system.
【０００７】[0007]
【課題を解決するための手段】本発明によれば、移動局
に設けられている移動局アンテナを用い、送信と受信と
で異なる周波数を用いて通信を行なう移動通信システム
において、前記移動局アンテナとして送信アンテナ及び
受信アンテナを備え、かつ前記送信アンテナ及び前記受
信アンテナが同一方向に最大利得が得られる指向性を有
していることを特徴とする移動通信システムが得られ
る。According to the present invention, there is provided a mobile communication system in which a mobile station antenna provided in a mobile station is used to perform communication using different frequencies for transmission and reception. As a result, a mobile communication system is provided, which is provided with a transmitting antenna and a receiving antenna, and the transmitting antenna and the receiving antenna have a directivity with which a maximum gain is obtained in the same direction.
【０００８】又、本発明によれば、移動局アンテナを有
する移動局と衛星との相互間で、送信と受信とで異なる
周波数を用いて通信を行なう移動通信システムにおい
て、前記移動局アンテナには送信アンテナと受信アンテ
ナとが設けられ、前記送信アンテナ及び前記受信アンテ
ナが同一方向に最大利得が得られる指向性を有し、前記
移動局の位置の変更に伴って前記送信アンテナ及び前記
受信アンテナの前記衛星に対する指向方向をそれぞれ独
立して調整することを特徴とする移動通信システムが得
られる。Further, according to the present invention, in a mobile communication system in which a mobile station having a mobile station antenna and a satellite communicate with each other using different frequencies for transmission and reception, A transmission antenna and a reception antenna are provided, and the transmission antenna and the reception antenna have directivities so that the maximum gain is obtained in the same direction, and the transmission antenna and the reception antenna have a directivity according to a change in the position of the mobile station. A mobile communication system is obtained which is characterized by independently adjusting the pointing directions with respect to the satellites.
【０００９】さらに、本発明によれば、前記送信アンテ
ナ及び前記受信アンテナがヘリカル型マストアンテナで
あることを特徴とする移動通信システムが得られる。Further, according to the present invention, there is provided a mobile communication system in which the transmitting antenna and the receiving antenna are helical mast antennas.
【００１０】[0010]
【実施例】本発明に係る移動通信システムの一実施例に
ついて図１を参照して説明する。図１は本発明の一実施
例を説明する図である。この移動通信システムにおい
て、移動局（図示せず）には、送信用アンテナＡと受信
用アンテナＢを独立して設けている。従って、送信用ア
ンテナＡと受信用アンテナＢにおいて、それぞれ独立し
て指向性を調節することによって各々通信対象Ｃに対し
て最適の指向性を持たせることができる。この場合、送
信用アンテナＡと受信用アンテナＢには図２に示すよう
なヘリカル型マストアンテナが使用される。DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the mobile communication system according to the present invention will be described with reference to FIG. FIG. 1 is a diagram for explaining an embodiment of the present invention. In this mobile communication system, a mobile station (not shown) is provided with a transmitting antenna A and a receiving antenna B independently. Therefore, by adjusting the directivities of the transmitting antenna A and the receiving antenna B independently, it is possible to give the communication target C an optimum directivity. In this case, a helical mast antenna as shown in FIG. 2 is used for the transmitting antenna A and the receiving antenna B.
【００１１】例えば、送信と受信にそれぞれ用いられる
送信周波数ＴＸ，受信周波数ＲＸを図３に示すような値
（ＴＸ：１．６６ＧＨｚ，ＲＸ：１．５５９ＧＨｚ）と
した場合、上述のように、送信用アンテナＡと受信用ア
ンテナＢの指向性を独立して調節することによって図３
における送信用アンテナＡの指向性（破線）と受信用ア
ンテナＢの指向性（実線）とが同じになり、実線と破線
とが重なる。従って、送信用アンテナＡと受信用アンテ
ナＢは各々通信対象Ｃに対して最適の指向性を持つこと
ができる。即ち、送信と受信にそれぞれ用いられる周波
数において最大利得の得られる角度を通信対象Ｃの方向
として設定可能となる。For example, when the transmission frequency TX and the reception frequency RX used for transmission and reception are values as shown in FIG. 3 (TX: 1.66 GHz, RX: 1.559 GHz), as described above, By independently adjusting the directivities of the credit antenna A and the receiving antenna B, FIG.
The directivity (broken line) of the transmitting antenna A and the directivity (solid line) of the receiving antenna B in are the same, and the solid line and the broken line overlap. Therefore, the transmitting antenna A and the receiving antenna B can each have an optimum directivity with respect to the communication target C. That is, the angle at which the maximum gain is obtained at the frequencies used for transmission and reception can be set as the direction of the communication target C.
【００１２】尚、送信用アンテナＡと受信用アンテナＢ
の指向性の調節は、図２に示すようならせん状のヘリカ
ルを巻線の周方向にさらにねじって１ヘリカルの長さＬ
を変えたり、ピッチＳを変えたりして行なわれる。A transmitting antenna A and a receiving antenna B
To adjust the directivity of the coil, the helical helix as shown in FIG. 2 is further twisted in the circumferential direction of the winding to length L of one helix.
And the pitch S are changed.
【００１３】[0013]
【発明の効果】本発明によれば、送信用と受信用のアン
テナを独立して設ける構成をとることにより、送信と受
信で異なる周波数を使用する場合、両方の周波数におい
て最大利得の得られる角度を通信対象の方向として設定
することができる。According to the present invention, by adopting a structure in which the transmitting antenna and the receiving antenna are provided independently, when different frequencies are used for transmission and reception, the angle at which the maximum gain is obtained at both frequencies. Can be set as the direction of the communication target.
【図１】本発明に係る移動通信システムの一実施例を示
す図である。FIG. 1 is a diagram showing an embodiment of a mobile communication system according to the present invention.
【図２】本発明に係る移動通信システムに用いられる移
動局アンテナの構造を示す図である。FIG. 2 is a diagram showing a structure of a mobile station antenna used in the mobile communication system according to the present invention.
【図３】従来の移動通信システムによる指向性と周波数
の関係を示したグラフである。FIG. 3 is a graph showing the relationship between directivity and frequency in a conventional mobile communication system.
Ａ 送信用アンテナ Ｂ 受信用アンテナ Ｃ 通信対象 A transmitting antenna B receiving antenna C communication target
Claims (3)
を用い、送信と受信とで異なる周波数を用いて通信を行
なう移動通信システムにおいて、前記移動局アンテナと
して送信アンテナ及び受信アンテナを備え、かつ前記送
信アンテナ及び前記受信アンテナが同一方向に最大利得
が得られる指向性を有していることを特徴とする移動通
信システム。1. A mobile communication system that uses a mobile station antenna provided in a mobile station to perform communication using different frequencies for transmission and reception, wherein a transmission antenna and a reception antenna are provided as the mobile station antenna, and A mobile communication system, wherein the transmitting antenna and the receiving antenna have directivity so that maximum gain is obtained in the same direction.
の相互間で、送信と受信とで異なる周波数を用いて通信
を行なう移動通信システムにおいて、前記移動局アンテ
ナには送信アンテナと受信アンテナとが設けられ、前記
送信アンテナ及び前記受信アンテナが同一方向に最大利
得が得られる指向性を有し、前記移動局の位置の変更に
伴って前記送信アンテナ及び前記受信アンテナの前記衛
星に対する指向方向をそれぞれ独立して調整することを
特徴とする移動通信システム。2. A mobile communication system for performing communication between a mobile station having a mobile station antenna and a satellite using different frequencies for transmission and reception, wherein the mobile station antenna includes a transmission antenna and a reception antenna. Is provided, and the transmitting antenna and the receiving antenna have directivity with which maximum gain is obtained in the same direction, and the directivity of the transmitting antenna and the receiving antenna with respect to the satellite is changed with a change in the position of the mobile station. A mobile communication system characterized by being adjusted independently.
において、前記送信アンテナ及び前記受信アンテナがヘ
リカル型マストアンテナであることを特徴とする移動通
信システム。3. The mobile communication system according to claim 1, wherein the transmitting antenna and the receiving antenna are helical mast antennas.
Priority Applications (6)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP5161054A JPH0779189A (en) | 1993-06-30 | 1993-06-30 | Mobile communications system |
| AU66060/94A AU680497B2 (en) | 1993-06-30 | 1994-06-29 | Antenna apparatus having individual transmitting and receiving antenna elements for different frequencies |
| CA002127079A CA2127079C (en) | 1993-06-30 | 1994-06-29 | Antenna apparatus having individual transmitting and receiving antenna elements for different frequencies |
| DE69421009T DE69421009T2 (en) | 1993-06-30 | 1994-06-29 | Antenna connection with individual transmit and receive antenna elements for different frequencies |
| EP94110127A EP0632603B1 (en) | 1993-06-30 | 1994-06-29 | Antenna apparatus having individual transmitting and receiving antenna elements for different frequencies |
| US08/269,053 US5477232A (en) | 1993-06-30 | 1994-06-29 | Antenna apparatus having individual transmitting and receiving antenna elements for different frequencies |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP5161054A JPH0779189A (en) | 1993-06-30 | 1993-06-30 | Mobile communications system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0779189A true JPH0779189A (en) | 1995-03-20 |
Family
ID=15727737
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP5161054A Pending JPH0779189A (en) | 1993-06-30 | 1993-06-30 | Mobile communications system |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0779189A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6459916B1 (en) | 1996-04-16 | 2002-10-01 | Kyocera Corporation | Portable radio communication device |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS648703A (en) * | 1987-07-01 | 1989-01-12 | Mitsubishi Electric Corp | Rf equipment for satellite communication earth station |
| JPH0486104A (en) * | 1990-07-30 | 1992-03-18 | Mitsubishi Electric Corp | Antenna system |
-
1993
- 1993-06-30 JP JP5161054A patent/JPH0779189A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS648703A (en) * | 1987-07-01 | 1989-01-12 | Mitsubishi Electric Corp | Rf equipment for satellite communication earth station |
| JPH0486104A (en) * | 1990-07-30 | 1992-03-18 | Mitsubishi Electric Corp | Antenna system |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6459916B1 (en) | 1996-04-16 | 2002-10-01 | Kyocera Corporation | Portable radio communication device |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| A02 | Decision of refusal |
Free format text: JAPANESE INTERMEDIATE CODE: A02 Effective date: 19960409 |