JPH0435324A - Antenna switch - Google Patents
Antenna switchInfo
- Publication number
- JPH0435324A JPH0435324A JP2137824A JP13782490A JPH0435324A JP H0435324 A JPH0435324 A JP H0435324A JP 2137824 A JP2137824 A JP 2137824A JP 13782490 A JP13782490 A JP 13782490A JP H0435324 A JPH0435324 A JP H0435324A
- Authority
- JP
- Japan
- Prior art keywords
- side circuit
- pass filter
- circuit
- low pass
- reception
- 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
- 230000005540 biological transmission Effects 0.000 abstract description 9
- 230000035945 sensitivity Effects 0.000 abstract description 7
- 230000005855 radiation Effects 0.000 abstract description 6
- 239000003990 capacitor Substances 0.000 abstract description 2
- 230000015556 catabolic process Effects 0.000 abstract 1
- 238000006731 degradation reaction Methods 0.000 abstract 1
- 230000007423 decrease Effects 0.000 description 3
- 239000000758 substrate Substances 0.000 description 3
- 230000000694 effects Effects 0.000 description 2
- 239000003795 chemical substances by application Substances 0.000 description 1
- 238000011109 contamination Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000001771 impaired effect Effects 0.000 description 1
Abstract
Description
【発明の詳細な説明】
産業上の利用分野
本発明は、携帯用電話などに用いられるアンテナスイッ
チに関するものである。DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to an antenna switch used in a mobile phone or the like.
従来の技術
従来、この種のアンテナスイッチは第２図のように構成
されていた。すなわち、送信端子ｌに送信側回路２が接
続され、この送信側回路２の出力側にアンテナ端子７が
接続され、前記送信側回路２の出力側に受信側回路３が
接続され、この受信側回路３の出力側に受信端子４が接
続されていた。BACKGROUND OF THE INVENTION Conventionally, this type of antenna switch has been constructed as shown in FIG. That is, a transmitting side circuit 2 is connected to the transmitting terminal l, an antenna terminal 7 is connected to the output side of the transmitting side circuit 2, a receiving side circuit 3 is connected to the output side of the transmitting side circuit 2, and the receiving side A receiving terminal 4 was connected to the output side of the circuit 3.
そしてローパスフィルタ６は、アンテナスイッチの外部
で、前記アンテナ端子７とアンテナ８の間に接続されて
いた。つまりアンテナスイッチとローパスフィルタ６は
、それぞれ個別に構成されていた。The low-pass filter 6 was connected between the antenna terminal 7 and the antenna 8 outside the antenna switch. In other words, the antenna switch and the low-pass filter 6 were each configured separately.
発明が解決しようとする！！！！
上記構成とした場合、送信時においては電源端子５に通
電してダイオード２ａを導通させてアンテナ８に送信側
回路２を接続する。また受信時には電源端子５からの通
電を断ってダイオード２ａを非導通とし、受信側回路３
をアンテナ８に接続する。この受信時においてダイオー
ド２ａは非導通としているのであるが、一つの基板上に
おいて送・受信側回路２，３が接近して設けられていた
ので、送信側回路２からの輻射が直接、受信側回路３へ
混入し、その結果として受信感度を低下させてしまうと
いう課題があった。Invention tries to solve! ! ! ! In the case of the above configuration, at the time of transmission, power is applied to the power supply terminal 5 to make the diode 2a conductive and connect the transmitting side circuit 2 to the antenna 8. Also, during reception, the power from the power supply terminal 5 is cut off to make the diode 2a non-conductive, and the receiving side circuit 3
Connect to antenna 8. At the time of this reception, the diode 2a is non-conductive, but since the transmitting and receiving circuits 2 and 3 are provided close to each other on the same board, the radiation from the transmitting circuit 2 is directly transmitted to the receiving side. There was a problem in that it got mixed into the circuit 3 and as a result, the reception sensitivity was reduced.
そこで本発明は、この受信感度の低下を防止することを
目的とするものである。Therefore, it is an object of the present invention to prevent this decrease in receiving sensitivity.
Ｉｆｆを解決するための手段
そしてこの目的を達成するために本発明は、基板上の送
、受信側回路間にローパスフィルタを配置したものであ
る。In order to solve this problem and to achieve this objective, the present invention disposes a low-pass filter between the transmitting and receiving circuits on the board.
作用
以上の構成とした場合、ローパスフィルタが基板上の送
、受信側回路間に配置されているので、送信側回路と受
信側回路との間の距離が大きくなり、これによって送信
側回路から輻射受信側回路への混入は防止され、結果と
して受信感度の低下が防止されるのである。If the configuration exceeds the function, a low-pass filter is placed between the transmitting and receiving circuits on the board, so the distance between the transmitting circuit and the receiving circuit becomes large, and this reduces radiation from the transmitting circuit. This prevents it from entering the receiving circuit, and as a result, a decrease in receiving sensitivity is prevented.
実施例 以下、本発明の実施例を図面を用いて説明する。Example Embodiments of the present invention will be described below with reference to the drawings.
なお、本実施例において、従来例と同一部品には同一番
号を付して説明を行う。In this embodiment, parts that are the same as those in the conventional example are given the same numbers and will be explained.
第１図に示すごとく、本実施例においては、つの基板９
上にローパスフィルタ６を用いた。このローパスフィル
タ６は、矩形状に蛇行させたパターンによるコイル６ａ
とチップによるコンデンサ（図示せず）から構成したも
のである。そしてこの状態において、ローパスフィルタ
６の左側の基板９上には送信側回路２が配置されている
。またローパスフィルタ６の右側の基板９上には受信側
回路３が配置されている０以上の構成とした場合、ロー
パスフィルタ６の配置により、送信側回路２と受信側回
路３とは分離去れ、両者間の距離も大きくなるので、こ
の間において、送信側回路２からの輻射の受信側回路３
への混入は起きなくなる。そしてこの結果として、受信
感度は、損なわれることなく、安定したレベルとなる。As shown in FIG. 1, in this embodiment, two substrates 9 are used.
A low-pass filter 6 was used above. This low-pass filter 6 has a coil 6a having a meandering rectangular pattern.
and a chip capacitor (not shown). In this state, the transmitting circuit 2 is arranged on the substrate 9 on the left side of the low-pass filter 6. Further, in the case of a configuration of 0 or more in which the receiving circuit 3 is arranged on the substrate 9 on the right side of the low-pass filter 6, the transmitting-side circuit 2 and the receiving-side circuit 3 are separated by the arrangement of the low-pass filter 6. Since the distance between the two also increases, during this time, the receiving circuit 3 of the radiation from the transmitting circuit 2
No contamination will occur. As a result, the receiving sensitivity remains at a stable level without being impaired.
なお、送信側回路２と受信側回路３は逆の位置であって
もよい。Note that the transmitting side circuit 2 and the receiving side circuit 3 may be in opposite positions.
また本実施例においてはローパスフィルタ６のパターン
によるコイル６ａを矩形状に蛇行させることにより、受
信側回路３のパターンによる直線状のコイル３ａと並行
状態にならぬようにしているので、この間の誘導作用は
おきにくくなる。Furthermore, in this embodiment, the coil 6a according to the pattern of the low-pass filter 6 is made to meander in a rectangular shape to prevent it from being in a parallel state with the linear coil 3a according to the pattern of the receiving side circuit 3. The effect becomes less likely to occur.
発明の効果
以上のように本発明は、基板上の送、受信側回路間にロ
ーパスフィルタを配置したものであるので、送信側回路
から受信側回路への輻射の混入は防止され、受信感度の
低下が防止できるものとなる。Effects of the Invention As described above, in the present invention, a low-pass filter is placed between the transmitting and receiving circuits on the board, so radiation from the transmitting circuit is prevented from entering the receiving circuit, and the receiving sensitivity is reduced. The decline can be prevented.
第１図は本発明の一実施例にかかるアンチナスの
イッチの平面図、第２図は従来例と本発明Ｙ実施例の電
気回路図である。
１・・・・・・送信端子、２・・・・・・送信側回路、
３・・・・・・受信側回路、４・・・・・・受信端子、
５・・・・・・電源端子、６・・・・・・ローパスフィ
ルタ、７・・・・・・アンテナ端子。
代理人の氏名 弁理士 粟野重孝 はか１名第 １１１
！！
第２図
６ ｏ−１ｒスフイＬりFIG. 1 is a plan view of an antinus switch according to an embodiment of the present invention, and FIG. 2 is an electric circuit diagram of a conventional example and a Y embodiment of the present invention. 1... Transmission terminal, 2... Transmission side circuit,
3... Receiving side circuit, 4... Receiving terminal,
5...Power terminal, 6...Low pass filter, 7...Antenna terminal. Name of agent: Patent attorney Shigetaka Awano, No. 111
! ! Figure 2 6 o-1r Sufi Lri
Claims (1)
れらの送、受信側回路間の前記基板上には、これらの送
、受信側回路とアンテナ端子間に電気的に介在させたロ
ーパスフィルターを配置したアンテナスイッチ。A transmitting side circuit and a receiving side circuit are provided on the board, and a low pass filter is electrically interposed between the transmitting and receiving side circuits and the antenna terminal on the board between these transmitting and receiving side circuits. Antenna switch placed.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2137824A JPH0435324A (en) | 1990-05-28 | 1990-05-28 | Antenna switch |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2137824A JPH0435324A (en) | 1990-05-28 | 1990-05-28 | Antenna switch |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0435324A true JPH0435324A (en) | 1992-02-06 |
Family
ID=15207707
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2137824A Pending JPH0435324A (en) | 1990-05-28 | 1990-05-28 | Antenna switch |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0435324A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2345615B (en) * | 1998-10-22 | 2003-10-29 | Matsushita Electric Ind Co Ltd | Transmitting/receiving switch and portable terminal unit |
| JP2008071557A (en) * | 2006-09-13 | 2008-03-27 | Fujitsu Ltd | Operation piece unit for switch, and electronic apparatus |
-
1990
- 1990-05-28 JP JP2137824A patent/JPH0435324A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2345615B (en) * | 1998-10-22 | 2003-10-29 | Matsushita Electric Ind Co Ltd | Transmitting/receiving switch and portable terminal unit |
| US7127215B2 (en) | 1998-10-22 | 2006-10-24 | Matsushita Electric Industrial Co., Ltd. | Transmitting/receiving switch |
| JP2008071557A (en) * | 2006-09-13 | 2008-03-27 | Fujitsu Ltd | Operation piece unit for switch, and electronic apparatus |
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