JPS61214625A - Antenna coupling circuit - Google Patents
Antenna coupling circuitInfo
- Publication number
- JPS61214625A JPS61214625A JP60055047A JP5504785A JPS61214625A JP S61214625 A JPS61214625 A JP S61214625A JP 60055047 A JP60055047 A JP 60055047A JP 5504785 A JP5504785 A JP 5504785A JP S61214625 A JPS61214625 A JP S61214625A
- Authority
- JP
- Japan
- Prior art keywords
- circuit
- transmitting
- receiving
- trap
- frequency
- 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
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/38—Transceivers, i.e. devices in which transmitter and receiver form a structural unit and in which at least one part is used for functions of transmitting and receiving
- H04B1/40—Circuits
- H04B1/50—Circuits using different frequencies for the two directions of communication
- H04B1/52—Hybrid arrangements, i.e. arrangements for transition from single-path two-direction transmission to single-direction transmission on each of two paths or vice versa
Landscapes
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Transceivers (AREA)
Abstract
Description
【発明の詳細な説明】
産業上の利用分野
本発明は、１本のアンテナを送受信で共用するデユープ
レックス通信用のアンテナ結合回路に関する。DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to an antenna coupling circuit for duplex communication in which one antenna is shared for transmission and reception.
従来の技術
従来、１本のアンテナを送受信で同時に使用する場合１
次のような方式が採られている。第１の方式として、空
胴共振器を用いるものがある。第２の方式として方向性
結合器を用いるものがある。Conventional technology Conventionally, when one antenna is used for transmitting and receiving at the same time 1
The following method is adopted. A first method uses a cavity resonator. A second method uses a directional coupler.
第３の方式として第３図に示すように、送信回路１のＴ
ｘ端子・アンテナＡＮＴ２間、受信回路３のＲｘ端子・
アンテナＡＮＴ２間の各々にフィルタ回路４，５を介在
させるものがある。As a third method, as shown in FIG.
Between the x terminal and the antenna ANT2, the Rx terminal of the receiving circuit 3,
Some antennas have filter circuits 4 and 5 interposed between the antennas ANT2.
発明が解決しようとする問題点
まず、空胴共振器や方向性結合器による場合、非常に高
価な部品が必要となる。Problems to be Solved by the Invention First, when using a cavity resonator or a directional coupler, very expensive components are required.
又、第３のフィルタ方式の場合、狭帯域フィルタの調整
が困難であり、このフィルタが送信回路の負荷になるこ
とからアンテナ回路のインピーダンス整合がとりにくい
。より具体的には、フィルタ回路１の周波数は送信周波
数ｆ？、 フィルタ回路２の周波数は受信周波数ｆＲに
各々設定されているが、第４図に示すように、各々のフ
ィルタ能力に重複領域を生じて送受信間のアイソレーシ
ョンを完全なものとすることができない。Furthermore, in the case of the third filter method, it is difficult to adjust the narrow band filter, and this filter becomes a load on the transmitting circuit, making it difficult to match the impedance of the antenna circuit. More specifically, the frequency of the filter circuit 1 is the transmission frequency f? , the frequencies of the filter circuits 2 are each set to the reception frequency fR, but as shown in Figure 4, there is an overlapping area in each filter capability, making it impossible to achieve complete isolation between transmission and reception. .
しかして２本発明は、アンテナとの整合を採ることがで
き、送受信間のアイソレーションを完全なものとするこ
とができるアンテナ結合回路を得ることを目的とする。Therefore, two objects of the present invention are to obtain an antenna coupling circuit that can match the antenna and achieve complete isolation between transmitting and receiving.
問題点を解決するための手段
本発明は、送信回路６を送信周波数ｆＴに設定された送
信用フィルタ回路８を介してアンテナ７に接続するとと
もに、受信回路９を送信周波数ｆＴと分離された受信周
波数ｆＲに設定された受信用フィルタ回路１０を介して
アンテナ７に接続し、送信回路６・送信用フィルタ回路
８間に受信周波数ｆＲに共振周波数が設定された受信用
トラップ回路１１を設けるとともに、受信回路９・受信
用フィルタ回路１０間に送信周波数ｆＴに共振周波数が
設定された送信用トラップ回路１２を設ける構成を採用
するものである。Means for Solving the Problems The present invention connects the transmitting circuit 6 to the antenna 7 via the transmitting filter circuit 8 set to the transmitting frequency fT, and connects the receiving circuit 9 to the receiving circuit 9 separated from the transmitting frequency fT. A receiving trap circuit 11 is connected to the antenna 7 via a receiving filter circuit 10 set to the frequency fR, and a receiving trap circuit 11 whose resonance frequency is set to the receiving frequency fR is provided between the transmitting circuit 6 and the transmitting filter circuit 8. A configuration is adopted in which a transmitting trap circuit 12 whose resonant frequency is set to the transmitting frequency fT is provided between the receiving circuit 9 and the receiving filter circuit 10.
作用
基本的には、送受信電力が各々のフィルタ回路８．１０
により分離されてアンテナ７がら出力され又は受信回路
９に入力されるが、その周波数分離が完全でないとして
も、送信側には受信周波数ｆＲに設定された受信用トラ
ップ回路１１を有し、受信側には送信周波数ｆＴに設定
された送信用トラップ回路１２を有するので、互いに洩
れのないインピーダンス整合を採ることができ、送受信
間のアイソレーションを確実なものとすることができる
ものである。Basically, the transmitting and receiving power is controlled by each filter circuit 8.10.
However, even if the frequency separation is not perfect, the transmitting side has a receiving trap circuit 11 set to the receiving frequency fR, and the receiving side Since the transmission trap circuit 12 has a transmission trap circuit 12 set to the transmission frequency fT, impedance matching without leakage can be achieved, and isolation between transmission and reception can be ensured.
実施例
本発明の一実施例を第１図および第２図に基づいて説明
する。まず、送信回路６のＴｘ入力端子・アンテナＡＮ
Ｔ７間には送信周波数ｆＴをバスさせるようにその周波
数が設定された送信用フィルタ回路８が介在されている
。一方、受信回路９のＲｘ出力端子・前記アンテナＡＮ
Ｔ７間には受信周波数ｆＲをパスさせるようにその周波
数が設定された受信用フィルタ回路１ｏが介在されてい
る。これらのフィルタ回路８，１ｏは共にり、Ｃにより
構成された１／４波長波長同型が用いられている。しか
して、本実施例では、前記送信回路６・送信用フィルタ
回路８に受信用トラップ回路１１を設けるとともに、前
記受信回路９・受信用フィルタ回路１０間には送信用ト
ラップ回路１２を設けるものである。ここで、前記トラ
ップ回路１１．１２は何れもり、Ｃ直列共振回路構成で
あり、前記受信用トラップ回路１１の共振周波数は受信
周波数ｆＲに設定され、他方の送信用トラップ回路１２
の共振周波数は送信周波数ｆＴに設定されている。Embodiment An embodiment of the present invention will be described based on FIGS. 1 and 2. First, the Tx input terminal/antenna AN of the transmitting circuit 6
A transmission filter circuit 8 whose frequency is set so as to pass the transmission frequency fT is interposed between T7. On the other hand, the Rx output terminal of the receiving circuit 9 and the antenna AN
A reception filter circuit 1o whose frequency is set so as to pass the reception frequency fR is interposed between T7. Both of these filter circuits 8 and 1o use a 1/4 wavelength isomorphism composed of C. Therefore, in this embodiment, a receiving trap circuit 11 is provided in the transmitting circuit 6 and the transmitting filter circuit 8, and a transmitting trap circuit 12 is provided between the receiving circuit 9 and the receiving filter circuit 10. be. Here, the trap circuits 11 and 12 both have a C series resonant circuit configuration, and the resonant frequency of the receiving trap circuit 11 is set to the receiving frequency fR, and the other transmitting trap circuit 12 is set to the receiving frequency fR.
The resonant frequency of is set to the transmission frequency fT.
このような構成において、送信回路６の送信出力はＴｘ
入力端子より入り、送信用フィルタ回路８を経てＡ点に
達する。この際、送信出力の送信周波数ｆＴに対して受
信用フィルタ回路１ｏのフィルタ能力が完全でないとし
ても、その後段の送信用トラップ回路１２が送信周波数
ｆＴにて共振するように設定され、その共振動作により
第２図に示すようにトラップの共振インピーダンスが低
いものとなる。つまり、送信周波数ｆＴに対して送信用
トラップ回路１２の存在により、受信用フィルタ回路１
０の右側が低インピーダンスとなっており、Ａ点から受
信用フィルタ回路１０（受信回路９）側を見た場合のイ
ンピーダンスはアンテナＡＮＴ７の特性インピーダンス
に比べて十分に高く保たれており、送信回路６からの送
信電力はアンテナＡＮＴ７側へ確実に供給される。換言
すれば、受信用フィルタ回路１０側への送信出力の洩れ
があったとしても送信用トラップ回路１２により吸収さ
れることになり、受信回路９側に入り込むことがなく、
受信回路９側とのアイソレーションを確保することがで
きる。In such a configuration, the transmission output of the transmission circuit 6 is Tx
The signal enters from the input terminal, passes through the transmission filter circuit 8, and reaches point A. At this time, even if the filtering ability of the reception filter circuit 1o is not perfect with respect to the transmission frequency fT of the transmission output, the transmission trap circuit 12 at the subsequent stage is set to resonate at the transmission frequency fT, and its resonance operation As a result, the resonant impedance of the trap becomes low as shown in FIG. In other words, due to the presence of the transmission trap circuit 12 for the transmission frequency fT, the reception filter circuit 1
The right side of 0 has low impedance, and the impedance when looking from point A to the receiving filter circuit 10 (receiving circuit 9) side is kept sufficiently high compared to the characteristic impedance of antenna ANT7, and the transmitting circuit The transmission power from antenna ANT 6 is reliably supplied to antenna ANT 7. In other words, even if the transmission output leaks to the reception filter circuit 10 side, it will be absorbed by the transmission trap circuit 12 and will not leak into the reception circuit 9 side.
Isolation from the receiving circuit 9 side can be ensured.
一方、受信時について説明する。まず、アンテナＡＮＴ
７からの受信電力はＡ点に達する。この際、受信出力の
受信周波数ｆＲに対して送信用フィルタ回路８のフィル
タ能力が完全でないとしても、その後段の受信用トラッ
プ回路１１が受信周波数ｆＲにて共振するように設定さ
れ、その共振動作により第２図に示すようにトラップの
共振インピーダンスが低いものとなる。つまり、受信周
波数ｆＲに対して受信用トラップ回路１１の存在により
、送信用フィルタ回路８の左側が低インピ−ダンスとな
っており、Ａ点から送信用フィルタ回路８（送信回路６
）側を見た場合のインピーダンスは受信用フィルタ回路
１０のインピーダンスに比べて十分に高く保たれており
、アンテナＡＮＴ７からの受信電力は受信用フィルタ回
路１ｏを経て出力端子Ｒｘへ導かれ、受信回路９に入力
する。アンテナＡＮＴＴ側へ確実に供給される。換言す
れば、送信用フィルタ回路８側への受信入力の洩れがあ
ったとしても受信用トラップ回路１１により吸収される
ことになり、送信回路６側に入り込むことがなく、送信
回路６側とのアイソレーションを確保することができる
。On the other hand, the time of reception will be explained. First, the antenna ANT
The received power from 7 reaches point A. At this time, even if the filtering ability of the transmitting filter circuit 8 is not perfect for the receiving frequency fR of the receiving output, the receiving trap circuit 11 at the subsequent stage is set to resonate at the receiving frequency fR, and its resonance operation As a result, the resonant impedance of the trap becomes low as shown in FIG. In other words, due to the presence of the reception trap circuit 11 with respect to the reception frequency fR, the left side of the transmission filter circuit 8 has low impedance, and the transmission filter circuit 8 (transmission circuit 6
) side is kept sufficiently high compared to the impedance of the reception filter circuit 10, and the received power from the antenna ANT7 is guided to the output terminal Rx via the reception filter circuit 1o, and the reception circuit Enter 9. It is reliably supplied to the antenna ANTT side. In other words, even if there is a leakage of reception input to the transmission filter circuit 8 side, it will be absorbed by the reception trap circuit 11 and will not enter the transmission circuit 6 side, thereby preventing communication with the transmission circuit 6 side. Isolation can be ensured.
なお５回路調整について説明すると、フィルタ回路８，
１０はＶＨＦ帯では集中定数回路（Ｔ型回路構成でもよ
い）、ＵＨＦＨＦ上では分布定数回路により構成するが
、何方の場合も固定部品を使用して調整を省略すること
ができる。一方、トラップ回路１１．１２にはＱの高い
ヘリカルレゾネータが用いられ、アイソレーション最大
点に調整される。In addition, to explain the five-circuit adjustment, filter circuit 8,
10 is composed of a lumped constant circuit (a T-type circuit configuration may be used) in the VHF band, and a distributed constant circuit in the UHF band, but in either case, fixed parts can be used and adjustment can be omitted. On the other hand, a high Q helical resonator is used in the trap circuits 11 and 12, and is adjusted to the maximum isolation point.
このように本実施例によれば、安価な部品で構成するこ
とができ、調整点も少なくて、この調整を単一周波数で
行なえるため、スイープする必要がなく、容易なものと
なる。そして、アンテナＡＮＴ７とのインピーダンス整
合をとれるため、電力ロスが少なくて、送受信間のアイ
ソレーションも確実なものとして良好なるデユープレッ
クス通償を行なうことができる。As described above, according to this embodiment, it can be constructed with inexpensive parts, the number of adjustment points is small, and the adjustment can be performed at a single frequency, so there is no need for sweeping, making it easy. Since impedance matching with the antenna ANT7 can be achieved, power loss is reduced and isolation between transmission and reception is ensured, making it possible to perform good duplex compensation.
発明の効果
本発明は、上述したように、送信側には受信周波数に設
定された受信用トラップ回路を設け、受信側には送信周
波数に設定された送信用トラップ回路を設けたので、ア
ンテナとのインピーダンス整合を採ることができ、送受
信間のアイソレーションを確実なものとして、良好なる
デュープレッタス通信を行なうことができ、このための
構成も安価で調整点の少ないものとして構成することが
できるものである。Effects of the Invention As described above, the present invention provides a receiving trap circuit set to the receiving frequency on the transmitting side, and a transmitting trap circuit set to the transmitting frequency on the receiving side. Impedance matching can be achieved, isolation between transmitter and receiver is ensured, and good duplex communication can be performed, and the configuration for this can be configured at low cost and with few adjustment points. It is something.
第１図は本発明の一実施例を示す回路図、第２図はトラ
ップのインピーダンス特性図、第３図は従来例を示す回
路図、第４図はそのレスポンス特性図である。
６・・・送信回路、７・・・アンテナ、８輸送信用フィ
ルタ回路、９・・・受信回路、１ｏ・・・受信用フィル
タ回路、１１・・・受信用トラップ回路、１２・・・送
信用トラップ回路FIG. 1 is a circuit diagram showing an embodiment of the present invention, FIG. 2 is a trap impedance characteristic diagram, FIG. 3 is a circuit diagram showing a conventional example, and FIG. 4 is a response characteristic diagram thereof. 6... Transmission circuit, 7... Antenna, 8 Transportation filter circuit, 9... Receiving circuit, 1o... Filter circuit for reception, 11... Trap circuit for reception, 12... For transmission trap circuit
Claims (1)
を介してアンテナに接続するとともに、受信回路を前記
送信周波数と分離された受信周波数に設定された受信用
フィルタ回路を介して前記アンテナに接続し、前記送信
回路・送信用フィルタ回路間に前記受信周波数に共振周
波数が設定された受信用トラップ回路を設けるとともに
、前記受信回路・受信用フィルタ回路間に前記送信周波
数に共振周波数が設定された送信用トラップ回路を設け
たことを特徴とするアンテナ結合回路。A transmitting circuit is connected to the antenna via a transmitting filter circuit set to a transmitting frequency, and a receiving circuit is connected to the antenna via a receiving filter circuit set to a receiving frequency separated from the transmitting frequency. A receiving trap circuit having a resonant frequency set to the receiving frequency is provided between the transmitting circuit and the transmitting filter circuit, and a transmitting trap circuit having a resonant frequency set to the transmitting frequency between the receiving circuit and the receiving filter circuit. An antenna coupling circuit characterized in that a reliable trap circuit is provided.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP60055047A JPS61214625A (en) | 1985-03-19 | 1985-03-19 | Antenna coupling circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP60055047A JPS61214625A (en) | 1985-03-19 | 1985-03-19 | Antenna coupling circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS61214625A true JPS61214625A (en) | 1986-09-24 |
Family
ID=12987755
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP60055047A Pending JPS61214625A (en) | 1985-03-19 | 1985-03-19 | Antenna coupling circuit |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS61214625A (en) |
Cited By (15)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH01200726A (en) * | 1988-02-04 | 1989-08-11 | Matsushita Electric Ind Co Ltd | Antenna multicoupler |
| JPH01243625A (en) * | 1988-03-24 | 1989-09-28 | Matsushita Electric Ind Co Ltd | Antenna shared unit |
| US4980660A (en) * | 1986-10-06 | 1990-12-25 | Matsushita Electric Industrial Co., Ltd. | Antenna sharing apparatus for switchable transmit/receive filters |
| US5015974A (en) * | 1988-06-20 | 1991-05-14 | Oki Electric Industry Co., Ltd. | Isolating circuit and dielectric filter for use therein |
| US5015973A (en) * | 1987-08-31 | 1991-05-14 | Oki Electric Industry Co., Ltd. | Duplexer with an isolating circuit on a dielectric plate |
| EP0441500A2 (en) * | 1990-02-08 | 1991-08-14 | Nokia Mobile Phones (U.K.) Limited | Radio Transceiver |
| JPH05244034A (en) * | 1992-02-26 | 1993-09-21 | Saitama Nippon Denki Kk | Radio transmitter/receiver |
| US5375256A (en) * | 1991-09-04 | 1994-12-20 | Nec Corporation | Broadband radio transceiver |
| EP0680108A1 (en) * | 1994-04-26 | 1995-11-02 | Murata Manufacturing Co., Ltd. | Duplexer |
| US5515015A (en) * | 1992-06-18 | 1996-05-07 | Mitsubishi Denki Kabushiki Kaisha | Transceiver duplex filter utilizing saw filter |
| US5768692A (en) * | 1994-12-20 | 1998-06-16 | Lg Electronics Inc. | Transmission and reception matching method for a cordless communication apparatus and apparatus thereof |
| AU708446B2 (en) * | 1995-04-28 | 1999-08-05 | Toko Kabushiki Kaisha | Antenna sharing apparatus |
| WO1999048199A1 (en) * | 1998-03-17 | 1999-09-23 | Matsushita Electric Industrial Co., Ltd. | Multiplexer/branching filter |
| WO1999048220A1 (en) * | 1998-03-17 | 1999-09-23 | Motorola Inc. | Combiner circuit for dual band voltage controlled oscillators |
| JP2008252249A (en) * | 2007-03-29 | 2008-10-16 | Mitsubishi Electric Corp | Ground station apparatus for satellite communication |
-
1985
- 1985-03-19 JP JP60055047A patent/JPS61214625A/en active Pending
Cited By (18)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4980660A (en) * | 1986-10-06 | 1990-12-25 | Matsushita Electric Industrial Co., Ltd. | Antenna sharing apparatus for switchable transmit/receive filters |
| US5015973A (en) * | 1987-08-31 | 1991-05-14 | Oki Electric Industry Co., Ltd. | Duplexer with an isolating circuit on a dielectric plate |
| JPH01200726A (en) * | 1988-02-04 | 1989-08-11 | Matsushita Electric Ind Co Ltd | Antenna multicoupler |
| JPH01243625A (en) * | 1988-03-24 | 1989-09-28 | Matsushita Electric Ind Co Ltd | Antenna shared unit |
| US5015974A (en) * | 1988-06-20 | 1991-05-14 | Oki Electric Industry Co., Ltd. | Isolating circuit and dielectric filter for use therein |
| US5267234A (en) * | 1990-02-08 | 1993-11-30 | Technophone Limited | Radio transceiver with duplex and notch filter |
| EP0441500A2 (en) * | 1990-02-08 | 1991-08-14 | Nokia Mobile Phones (U.K.) Limited | Radio Transceiver |
| US5375256A (en) * | 1991-09-04 | 1994-12-20 | Nec Corporation | Broadband radio transceiver |
| JPH05244034A (en) * | 1992-02-26 | 1993-09-21 | Saitama Nippon Denki Kk | Radio transmitter/receiver |
| US5515015A (en) * | 1992-06-18 | 1996-05-07 | Mitsubishi Denki Kabushiki Kaisha | Transceiver duplex filter utilizing saw filter |
| EP0680108A1 (en) * | 1994-04-26 | 1995-11-02 | Murata Manufacturing Co., Ltd. | Duplexer |
| US5768692A (en) * | 1994-12-20 | 1998-06-16 | Lg Electronics Inc. | Transmission and reception matching method for a cordless communication apparatus and apparatus thereof |
| AU708446B2 (en) * | 1995-04-28 | 1999-08-05 | Toko Kabushiki Kaisha | Antenna sharing apparatus |
| WO1999048199A1 (en) * | 1998-03-17 | 1999-09-23 | Matsushita Electric Industrial Co., Ltd. | Multiplexer/branching filter |
| WO1999048220A1 (en) * | 1998-03-17 | 1999-09-23 | Motorola Inc. | Combiner circuit for dual band voltage controlled oscillators |
| US6011959A (en) * | 1998-03-17 | 2000-01-04 | Motorola, Inc. | Combiner circuit for dual band voltage controlled oscillators |
| US6335663B1 (en) | 1998-03-17 | 2002-01-01 | Matsushita Electric Industrial Co., Ltd. | Multiplexer/branching filter |
| JP2008252249A (en) * | 2007-03-29 | 2008-10-16 | Mitsubishi Electric Corp | Ground station apparatus for satellite communication |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US4910481A (en) | Branching filter | |
| US6326866B1 (en) | Bandpass filter, duplexer, high-frequency module and communications device | |
| US3731235A (en) | Dual polarized diplexer | |
| KR101084707B1 (en) | Dual band antenna with twin port | |
| US5584067A (en) | Dual traveling wave resonator filter and method | |
| JPS61214625A (en) | Antenna coupling circuit | |
| JPH06188622A (en) | Antenna multicoupler | |
| US4449108A (en) | Band-stop filter for VHF-UHF band | |
| JPS60174534A (en) | Antenna switch circuit | |
| JPH0378329A (en) | Rf transmitting/receiving circuit of shifting body communication facility | |
| JPS5892103A (en) | Microwave diplexer | |
| US2705752A (en) | Microwave communication system | |
| GB2188493A (en) | Orthogonal mode transducer | |
| JPH01158805A (en) | Antenna | |
| JPS60249436A (en) | Input switching device of receiver | |
| JPH0584961B2 (en) | ||
| US10686485B1 (en) | High isolation duplexer/quasi circulator with two quadrature couplers | |
| JPH053923B2 (en) | ||
| JPS6035311Y2 (en) | Transmission/reception duplexer | |
| GB2257335A (en) | Antenna switching circuit | |
| KR100504813B1 (en) | Front end transceiver for dual mode terminal | |
| JPS584500B2 (en) | Transmission/reception demultiplexing device | |
| JPS5924204Y2 (en) | wireless communication device | |
| JPH0645806A (en) | Synthesizing/branching filter | |
| JP2619843B2 (en) | Antenna duplexer |