JPH0332118A - Antenna switch circuit - Google Patents
Antenna switch circuitInfo
- Publication number
- JPH0332118A JPH0332118A JP1166160A JP16616089A JPH0332118A JP H0332118 A JPH0332118 A JP H0332118A JP 1166160 A JP1166160 A JP 1166160A JP 16616089 A JP16616089 A JP 16616089A JP H0332118 A JPH0332118 A JP H0332118A
- Authority
- JP
- Japan
- Prior art keywords
- pass filter
- antenna
- reception
- impedance circuit
- switching signal
- 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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- 239000003990 capacitor Substances 0.000 abstract description 10
- 208000019300 CLIPPERS Diseases 0.000 abstract description 3
- 208000021930 chronic lymphocytic inflammation with pontine perivascular enhancement responsive to steroids Diseases 0.000 abstract description 3
- 238000010586 diagram Methods 0.000 description 3
- 230000008878 coupling Effects 0.000 description 2
- 238000010168 coupling process Methods 0.000 description 2
- 238000005859 coupling reaction Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
Abstract
Description
【発明の詳細な説明】
〔産業上の利用分野〕
本発明は無線送受信機等に用いるアンテナスイッチ回路
に関する。DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an antenna switch circuit used in a wireless transmitter/receiver or the like.
一般に、アンテナを共用する無線送受信機においては、
−本のアンテナに対して送信機能と受信機能を切換える
アンテナスイッチ回路を備えている。Generally, in wireless transceivers that share an antenna,
-Equipped with an antenna switch circuit that switches between transmitting and receiving functions for the main antenna.
従来のアンテナスイッチ回路を第３図に符号３０で示す
。A conventional antenna switch circuit is shown at 30 in FIG.
同回路３０はインピーダンス回路３Ｉを備え、切換信号
入力端子３２ａが（＋）、３２ｂが（−）となる送信用
切換信号を付与すれば、矢印Ｉｂに沿って電流が流れる
。この結果、コイルＬ１０は接地状態となり、コンデン
サＣＩＯとコイルＬＩＯによる共振回路３３が形成され
るため、インピーダンス回路３１はダイオードＤｌｌの
カソード側から見ると高インピーダンス回路となり、送
信信号は矢印Ｈｔに沿って送信端子３５からアンテナ３
６に供給される。The circuit 30 includes an impedance circuit 3I, and when a transmission switching signal is applied such that the switching signal input terminal 32a becomes (+) and the switching signal input terminal 32b becomes (-), a current flows along the arrow Ib. As a result, the coil L10 becomes grounded and a resonant circuit 33 is formed by the capacitor CIO and the coil LIO, so the impedance circuit 31 becomes a high impedance circuit when viewed from the cathode side of the diode Dll, and the transmission signal is transmitted along the arrow Ht. From transmission terminal 35 to antenna 3
6.
一方、切換信号入力端子３２ａが（−）、３２ｂが（＋
）となる受信用切換信号を付与すれば、ダイオードＤＩ
Ｏが逆バイアスされるため、インピーダンス回路３１に
おけるコイルＬＩＯ１Ｌ１１、コンデンサＣＩＯ，Ｃ１
ｌ、Ｃ１２により二段のローパスフィルタ３１ａとして
機能し、受信信号は矢印Ｈｒに沿ってアンテナ３６から
ローパスフィルタ３１ａを通って受信端子３７に供給さ
れる。On the other hand, the switching signal input terminal 32a is (-), and the switching signal input terminal 32b is (+
), the diode DI
Since O is reverse biased, the coil LIO1L11 and the capacitors CIO and C1 in the impedance circuit 31
1 and C12 function as a two-stage low-pass filter 31a, and the received signal is supplied to the receiving terminal 37 from the antenna 36 through the low-pass filter 31a along the arrow Hr.
なお、ＤＩ２、Ｄ１３は過大受信入力をクリップさせる
クリッパ用ダイオード、３８はアンテナ３６１、：接続
したローパスフィルタを示す。Note that DI2 and D13 are clipper diodes for clipping excessive reception input, and 38 is a low-pass filter connected to the antenna 361.
ところで、上述した従来のアンテナスイッチ回路３０は
、受信時におけるインピーダンス回路３１はローパスフ
ィルタ３１ａとして機能し、結局、アンテナスイッチ回
路３０の総合フィルタ特性は第２図に示すように、同フ
ィルタ３１ａによる特性Ｐｌとアンテナ３６に接続した
ローパスフィルタ３８による特性Ｐ２によって符号Ｐ３
のようになる。このため、ローパスフィルタとしての特
性は向上するが、遣択度については十分とはいえず、特
に、受信ローカルが受信周波数よりも、より低い周波数
帯域に存在する場合には第１イメージ周波数が第１１Ｆ
周波数の２倍分だけ受信周波数よりも低い周波数となり
、また、受信周波数よりも低い周波数帯域に大電力層が
存在する場合にもきわめて不利となる。 しかも、ダ
イオードの使用数量が多くなり、回路的にも不利になる
問題があった。By the way, in the conventional antenna switch circuit 30 described above, the impedance circuit 31 functions as a low-pass filter 31a during reception, and as a result, the overall filter characteristics of the antenna switch circuit 30 are the characteristics of the filter 31a, as shown in FIG. P3 due to the characteristic P2 due to the low pass filter 38 connected to Pl and the antenna 36.
become that way. Therefore, although the characteristics as a low-pass filter are improved, the degree of selectivity is not sufficient. In particular, when the receiving local is in a lower frequency band than the receiving frequency, the first image frequency is the first image frequency. 11F
The frequency is lower than the reception frequency by twice the frequency, and it is also extremely disadvantageous when a high power layer exists in a frequency band lower than the reception frequency. Moreover, the number of diodes used is large, which is disadvantageous in terms of circuitry.
本発明はこのような従来の技術に存在する課題を解決し
たアンテナスイッチ回路の提供を目的とするものである
。An object of the present invention is to provide an antenna switch circuit that solves the problems existing in the conventional technology.
本発明に係るアンテナ３イツチ回路ｌはインピーダンス
回路を備え、受信用切換信号Ｓｒの付与により、前記イ
ンピーダンス回路をフィルターとして機能させ、アンテ
ナ３から受信可能に切換えるとともに、送信用切換信号
Ｓｔの付与により、前記インピーダンス回路を高インピ
ーダンス回路として機能させ、アンテナ３から送信可能
に切換えるスイッチ回路を構成するに際して、受信用切
換信号Ｓｒの付与により、ノ＼イバスフィルタ２ａとし
て機能するインピーダンス回路２を設けてなることを特
徴する。なお、この場合、インピーダンス回路２はアン
テナ３に接続したローパスフィルタ４と共に、バンドパ
スフィルタとして機能させることが望ましい。The antenna three-switch circuit l according to the present invention is equipped with an impedance circuit, and by applying a reception switching signal Sr, the impedance circuit functions as a filter and is switched to enable reception from the antenna 3, and by applying a transmission switching signal St. , when configuring a switch circuit that causes the impedance circuit to function as a high impedance circuit and switches to enable transmission from the antenna 3, an impedance circuit 2 that functions as a noise filter 2a by applying a reception switching signal Sr is provided. Characterized by becoming. In this case, it is desirable that the impedance circuit 2 functions as a bandpass filter together with the lowpass filter 4 connected to the antenna 3.
本発明に係るアンテナ３イツチ回路ｌによれば、受信用
切換信号Ｓｒを付与することにより、インピーダンス回
路２はハイパスフィルタ２ａとして機能し、受信周波数
よりも低い周波数帯域は遮断される。また、ハイパスフ
ィルタ２ａはアンテナ３に接続したローパスフィルタ４
と共に、バンドパスフィルタとして機能し、アンテナ３
イツチ回路ｌの総合選択度特性を向上させる。According to the three-and-one antenna circuit 1 according to the present invention, by applying the reception switching signal Sr, the impedance circuit 2 functions as a high-pass filter 2a, and a frequency band lower than the reception frequency is cut off. Furthermore, the high-pass filter 2a is a low-pass filter 4 connected to the antenna 3.
It also functions as a bandpass filter, and the antenna 3
To improve the overall selectivity characteristics of the switch circuit l.
以下には、本発明に係る好適な実施例を挙げ、図面に基
づき詳細に説明する。Hereinafter, preferred embodiments of the present invention will be described in detail based on the drawings.
まず、本発明に係るアンテナスイッチ回路１の構成につ
いて第１図を参照して説明する。First, the configuration of an antenna switch circuit 1 according to the present invention will be explained with reference to FIG.
３はアンテナであり、ローパスフィルタ４、カップリン
グコンデンサＣ３を介して共通接続点Ｘに接続する。ま
た、Ｉｌａ、ｌｌｂは切換信号の入力端子であり、一方
の入力端子１１ａは抵抗Ｒ１，チヲークコイルＬ２、ダ
イオードＤＩを介して接続点Ｘに接続するとともに、他
方の入力端子１１ｂはコイルＬｌを介して接続点Ｘに接
続する。そして、送信端子Ｉ２をカップリングコンデン
サＣ４を介してコイルＬ２とダイオードＤＩの接続部に
接続する。さらに、共通接続点ＸにはコンデンサＣ１、
Ｃ２を介して受信端子Ｉ３を接続する。コンデンサＣ１
と０２の接続部はコイルＬ２、抵抗Ｒ２を介して前記入
力端子１１ａに接続するとともに、同接続部と接地間に
は極性が反対となる一対のダイオードＤ２とＤ３を並列
接続し、また、コンデンサＣ２と受信端子１３の接続部
はコイルＬ３を介して接地する。なお、Ｃ５、Ｃ６、Ｃ
７は適宜接続したバイパスコンデンサを示す。3 is an antenna, which is connected to the common connection point X via a low-pass filter 4 and a coupling capacitor C3. Further, Ila and llb are input terminals for switching signals, and one input terminal 11a is connected to the connection point Connect to connection point X. Then, the transmission terminal I2 is connected to the connection between the coil L2 and the diode DI via the coupling capacitor C4. Furthermore, at the common connection point X, a capacitor C1,
Connect the receiving terminal I3 via C2. Capacitor C1
and 02 are connected to the input terminal 11a via a coil L2 and a resistor R2, and a pair of diodes D2 and D3 with opposite polarities are connected in parallel between the connection and the ground. The connection between C2 and receiving terminal 13 is grounded via coil L3. In addition, C5, C6, C
7 indicates a bypass capacitor connected as appropriate.
また、二点鎖線で囲った回路はインピーダンス回路２を
構成する。Further, a circuit surrounded by a two-dot chain line constitutes an impedance circuit 2.
次に、本発明に係るアンテナ３イツチ回路ｌの機能につ
いて説明する。Next, the function of the three-antenna circuit I according to the present invention will be explained.
まず、送信時には入力端子１１ａが（＋）、ｌｌｂが（
＝）となる受信用切換信号Ｓｔが付与され、矢印１ｅ及
びＩｆの二経路に電流が流れる。First, during transmission, the input terminal 11a is (+) and llb is (
= ) is applied, and current flows in two paths indicated by arrows 1e and If.
この結果、インピーダンス回路２におけるコイルＬｌと
コンデンサＣ１は共振回路を形成し、共通接続点Ｘから
みて受信端子１３側は高インピーダンス回路となる。′
よって、送信端子１２に入力する送信信号は矢印Ｅｔの
経路でアンテナ３に供給される。As a result, the coil Ll and the capacitor C1 in the impedance circuit 2 form a resonant circuit, and the receiving terminal 13 side as viewed from the common connection point X becomes a high impedance circuit. ′
Therefore, the transmission signal input to the transmission terminal 12 is supplied to the antenna 3 along the path indicated by the arrow Et.
一方、受信時には入力端子１１ａが（＝）、１１ｂが（
＋）となる受信用切換信号Ｓｒが付与される。受信時に
はダイオードＤｌが逆バイアスされるため、アンテナ３
で受信する受信信号は矢印Ｅｒの経路で受信端子１３に
供給される。この際、インピーダンス回路２を構成する
コンデンサＣ１゜Ｃ２とコイルＬＩＳＬ２、Ｌ３は二段
のハイパスフィルタ２ａとして機能する。On the other hand, during reception, the input terminal 11a is (=) and the input terminal 11b is (
+) is applied to the reception switching signal Sr. During reception, diode Dl is reverse biased, so antenna 3
The received signal received at the terminal 13 is supplied to the receiving terminal 13 along the path indicated by the arrow Er. At this time, the capacitors C1 and C2 and the coils LISL2 and L3 that constitute the impedance circuit 2 function as a two-stage high-pass filter 2a.
ところで、アンテナ３にはローパスフィルタ４が接続さ
れているため、このローパスフィルタ４によるフィルタ
特性は第２図中特性Ｐ２となり、また、ハイパスフィル
タ２ａによるフィルタ特性は同図中特性Ｐ４となるため
、結局、特性曲線が実線で示す特性ＰＯとなるバンドパ
スフィルタとして機能する。即ち、本発明に係るアンテ
ナスイッチ回路１によれば、受信時には受信信号がバン
ドパスフィルタを通過し、全体の選択度特性は大きく向
上する。By the way, since the low-pass filter 4 is connected to the antenna 3, the filter characteristic of the low-pass filter 4 is the characteristic P2 in FIG. 2, and the filter characteristic of the high-pass filter 2a is the characteristic P4 in the figure. In the end, it functions as a bandpass filter whose characteristic curve has the characteristic PO shown by the solid line. That is, according to the antenna switch circuit 1 according to the present invention, the received signal passes through the bandpass filter during reception, and the overall selectivity characteristic is greatly improved.
なお、クリッパ用ダイオードの機能をアンテナスイッチ
用のダイオードＤ２が兼用するため、従来回路（第３図
参照）に比べてダイオードは一本不要となる。Note that since the antenna switch diode D2 also serves as the clipper diode, one diode is not required compared to the conventional circuit (see FIG. 3).
以上、実施例について詳細に説明したが、本発明はこの
ような実施例に限定されるものではない。Although the embodiments have been described in detail above, the present invention is not limited to these embodiments.
例えば、アンテナに接続するローパスフィルタはなくて
もよい。また、インピーダンス回路は二段のフィルタと
して機能する場合を示したが他の段数であってもよい。For example, there may be no low-pass filter connected to the antenna. Moreover, although the case where the impedance circuit functions as a two-stage filter is shown, it may have another number of stages.
その他、細部の構成等において本発明の要旨を逸脱しな
い範囲で任意に変更できる。Other changes may be made in the detailed structure and the like without departing from the gist of the present invention.
このように、本発明に係るアンテナスイッチ回路は受信
用切換信号の付与により、ハイパスフィルタとして機能
するインピーダンス回路を設けてなるため、アンテナス
イッチ回路における総合の選択度特性が大きく向上する
とともに、ダイオードの使用数量を削減でき、回路上有
利となる効果を奏する。As described above, since the antenna switch circuit according to the present invention is provided with an impedance circuit that functions as a high-pass filter by applying a reception switching signal, the overall selectivity characteristic of the antenna switch circuit is greatly improved, and the diode The quantity used can be reduced, which has an advantageous effect on the circuit.
第１図：本発明に係るアンテナスイッチ回路の電気回路
図、
第２図二同アンテナスイツチ回路におけるフィルタ特性
図、
第３図：従来の技術に係るアンテナスイッチ回路の電気
回路図。
尚図面中、
ｌ：アンテナスイッチ回路
２：インピーダンス回路
２ａ：ハイパスフィルタFIG. 1: An electric circuit diagram of an antenna switch circuit according to the present invention. FIG. 2: A filter characteristic diagram in the same antenna switch circuit. FIG. 3: An electric circuit diagram of an antenna switch circuit according to the prior art. In the drawing, l: antenna switch circuit 2: impedance circuit 2a: high-pass filter
Claims (1)
与により、前記インピーダンス回路をフィルタとして機
能させ、アンテナから受信可能に切換えるとともに、送
信用切換信号の付与により、前記インピーダンス回路を
高インピーダンス回路として機能させ、アンテナから送
信可能に切換えるアンテナスイッチ回路において、受信
用切換信号の付与により、ハイパスフィルタとして機能
するインピーダンス回路を設けてなることを特徴とする
アンテナスイッチ回路。 〔２〕受信用切換信号の付与により、前記インピーダン
ス回路をハイパスフィルタとして機能させ、かつアンテ
ナに接続したローパスフィルタと共に、バンドパスフィ
ルタとして機能させることを特徴とする請求項１記載の
アンテナスイッチ回路。[Scope of Claims] [1] An impedance circuit is provided, and by applying a reception switching signal, the impedance circuit functions as a filter and is switched to enable reception from the antenna, and by applying a transmission switching signal, the impedance circuit functions as a filter. An antenna switch circuit that functions as a high impedance circuit and switches to enable transmission from the antenna, characterized in that the antenna switch circuit is provided with an impedance circuit that functions as a high pass filter by applying a reception switching signal. [2] The antenna switch circuit according to claim 1, wherein the impedance circuit is caused to function as a high-pass filter by applying a reception switching signal, and to function as a band-pass filter together with a low-pass filter connected to the antenna.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1166160A JPH0783290B2 (en) | 1989-06-28 | 1989-06-28 | Antenna switch circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1166160A JPH0783290B2 (en) | 1989-06-28 | 1989-06-28 | Antenna switch circuit |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0332118A true JPH0332118A (en) | 1991-02-12 |
| JPH0783290B2 JPH0783290B2 (en) | 1995-09-06 |
Family
ID=15826184
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1166160A Expired - Lifetime JPH0783290B2 (en) | 1989-06-28 | 1989-06-28 | Antenna switch circuit |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0783290B2 (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5442812A (en) * | 1992-07-08 | 1995-08-15 | Matsushita Electric Industrial Co., Ltd. | Antenna switching apparatus for selectively connecting antenna to transmitter or receiver |
| US7183875B2 (en) * | 1999-07-29 | 2007-02-27 | Murata Manufacturing Co., Ltd. | High frequency switching component with electrostatic surge elimination |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS52117509A (en) * | 1976-03-25 | 1977-10-03 | Motorola Inc | Antenna switching device |
-
1989
- 1989-06-28 JP JP1166160A patent/JPH0783290B2/en not_active Expired - Lifetime
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS52117509A (en) * | 1976-03-25 | 1977-10-03 | Motorola Inc | Antenna switching device |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5442812A (en) * | 1992-07-08 | 1995-08-15 | Matsushita Electric Industrial Co., Ltd. | Antenna switching apparatus for selectively connecting antenna to transmitter or receiver |
| US7183875B2 (en) * | 1999-07-29 | 2007-02-27 | Murata Manufacturing Co., Ltd. | High frequency switching component with electrostatic surge elimination |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0783290B2 (en) | 1995-09-06 |
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