JPH0595204A - Duplexer - Google Patents
DuplexerInfo
- Publication number
- JPH0595204A JPH0595204A JP3256304A JP25630491A JPH0595204A JP H0595204 A JPH0595204 A JP H0595204A JP 3256304 A JP3256304 A JP 3256304A JP 25630491 A JP25630491 A JP 25630491A JP H0595204 A JPH0595204 A JP H0595204A
- Authority
- JP
- Japan
- Prior art keywords
- filter
- duplexer
- acoustic wave
- surface acoustic
- 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
- Control Of Motors That Do Not Use Commutators (AREA)
- Surface Acoustic Wave Elements And Circuit Networks Thereof (AREA)
- Transceivers (AREA)
Abstract
(57)【要約】
【目的】小型で、かつ安定した性能をもつ分波器を提供
する。
【構成】送信フィルタあるいは受信フィルタのいずれか
一方に誘電体フィルタ５を用い、他方に表面弾性波フィ
ルタ４を用いて構成する。
(57) [Abstract] [Purpose] To provide a compact duplexer with stable performance. [Structure] A dielectric filter 5 is used for either the transmission filter or the reception filter, and a surface acoustic wave filter 4 is used for the other.
Description
【０００１】[0001]
【産業上の利用分野】本発明は、無線通信機等に用いら
れる分波器に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a duplexer used in a wireless communication device or the like.
【０００２】[0002]
【従来の技術】従来の分波器は、昭和６１年度電子通信
学会総合全国大会資料７４３「８００ＭＨｚ帯誘電体充
てん小型分波器」に記載のように、送信フィルタと受信
フィルタの双方に誘電体フィルタを用いていた。2. Description of the Related Art A conventional duplexer is a dielectric for both a transmission filter and a reception filter, as described in "The 800MHz Band Dielectric-Filled Small Demultiplexer", Material 743, National Conference of the Institute of Electronics and Communication Engineers, 1986. I used a filter.
【０００３】あるいは、特開昭６３−５４００９号公報
に記載のように、送信フィルタと受信フィルタの双方に
表面弾性波フィルタを用いていた。Alternatively, as described in Japanese Patent Laid-Open No. 63-54009, surface acoustic wave filters are used for both the transmission filter and the reception filter.
【０００４】[0004]
【発明が解決しようとする課題】近年、無線通信機の小
型化が急速に進み、分波器もこれに対応して高周波領域
での高安定を基本に、小型であることが要求されてい
る。しかし、従来の送信フィルタと受信フィルタの双方
に誘電体フィルタを用いていた分波器は、個々の誘電体
フィルタの容積が大きく、分波器を構成したときの容積
も大きくなる。In recent years, miniaturization of wireless communication devices has rapidly progressed, and correspondingly, the duplexer is required to be small based on high stability in a high frequency region. .. However, in the conventional duplexer that uses the dielectric filters for both the transmission filter and the reception filter, the volume of each dielectric filter is large, and the volume when the duplexer is configured is also large.
【０００５】又、従来の送信フィルタと受信フィルタの
双方に表面弾性波フィルタを用いていた分波器は、個々
の表面弾性波フィルタの容積は小さいながら、周辺回路
が必要となり、周辺回路を含めて同一パッケージ内に分
波器を構成したときの容積が大きくなる。これは一般
に、表面弾性波フィルタでは通過帯域内の入出力インピ
ーダンスが特性インピーダンスにあまり等しくないこ
と、及び、通過帯域外減衰帯域の入出力インピーダンス
が完全にはリアクタンスにならないことにより、周辺回
路を付加してインピーダンス補正を行う必要があるから
である。同時に、送信フィルタ、受信フィルタは、各々
一方のフィルタの通過帯域が他方のフィルタの通過帯域
外減衰帯域であるため、特性ばらつき等により一方のフ
ィルタの入出力インピーダンスにずれが生じると、他方
のフィルタの特性に影響するが、周辺回路を付加してイ
ンピーダンス補正を行っている場合、一方のフィルタの
入出力インピーダンスにずれが生じやすく、他方のフィ
ルタの特性も影響しやすくなり、所望の性能を得られな
いこともある。Further, in the conventional duplexer which uses the surface acoustic wave filters for both the transmission filter and the reception filter, peripheral circuits are required although the volume of each surface acoustic wave filter is small. Therefore, the volume when the duplexer is configured in the same package becomes large. This is because in a surface acoustic wave filter, the input / output impedance in the pass band is not very equal to the characteristic impedance, and the input / output impedance in the attenuation band outside the pass band does not become a reactance, so peripheral circuits are added. This is because it is necessary to perform impedance correction. At the same time, in the transmission filter and the reception filter, since the pass band of one filter is the attenuation band outside the pass band of the other filter, if the input / output impedance of one filter deviates due to variations in characteristics, the other filter However, if a peripheral circuit is added to perform impedance correction, the input / output impedance of one filter is likely to shift, and the characteristics of the other filter are also easily affected to obtain the desired performance. Sometimes you can't.
【０００６】本発明の目的は、無線通信機の小型化に充
分対応できるような小型で、かつ安定した性能をもつ分
波器を構成することにある。An object of the present invention is to construct a demultiplexer having a small size and stable performance, which can sufficiently cope with downsizing of a wireless communication device.
【０００７】[0007]
【課題を解決するための手段】上記目的を達成させるた
め、本発明は送信フィルタあるいは受信フィルタのいず
れか一方に誘電体フィルタを用い、他方に表面弾性波フ
ィルタを用いて同一パッケージ内に分波器を構成する。In order to achieve the above object, the present invention uses a dielectric filter as one of a transmission filter or a reception filter and a surface acoustic wave filter as the other, and separates them into the same package. Make up a container.
【０００８】[0008]
【作用】上記方法により、一方のフィルタは誘電体フィ
ルタであるため周辺回路が不必要であり、入出力インピ
ーダンスにずれが生じにくい。それによって他方の表面
弾性波フィルタは付加する周辺回路が簡単なものですむ
ため、容積は小さくなるだけでなく、かつ、誘電体フィ
ルタの影響を受けにくく、安定した性能をもつことがで
きる。即ち、容積が小さく、かつ安定した性能をもつ、
小型分波器を構成することができる。According to the above method, since one filter is a dielectric filter, a peripheral circuit is unnecessary, and deviation of input / output impedance is unlikely to occur. As a result, the other surface acoustic wave filter requires only a simple peripheral circuit to be added, so that not only the volume becomes smaller, but also the dielectric filter is less affected and stable performance can be obtained. That is, it has a small volume and stable performance,
A compact duplexer can be constructed.
【０００９】[0009]
【実施例】以下、本発明の一実施例を図により説明す
る。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings.
【００１０】本発明の一実施例を示す分波器の回路図を
図１に示す。この分波器は、受信フィルタに誘電体フィ
ルタ５を用い、送信フィルタに表面弾性波フィルタ４を
用いて分波器を構成している。表面弾性波フィルタ４は
整合回路用マイクロストリップライン７により入出力イ
ンピーダンスの補正が行なわれている。この送信用表面
弾性波フィルタ４は耐電力用構成のフィルタであり、送
信電力が大きいことに関して、表面弾性波フィルタの微
細電極パターンの、熱発生、マイグレーション等による
破壊は問題とする必要はない。A circuit diagram of a duplexer showing an embodiment of the present invention is shown in FIG. In this duplexer, a dielectric filter 5 is used as a reception filter, and a surface acoustic wave filter 4 is used as a transmission filter to form a duplexer. The input / output impedance of the surface acoustic wave filter 4 is corrected by the matching circuit microstrip line 7. The transmission surface acoustic wave filter 4 is a filter having a power-proof structure, and regarding the large transmission power, it is not necessary to cause a problem of the fine electrode pattern of the surface acoustic wave filter due to heat generation or migration.
【００１１】送信系端子２より分波器内に入力された送
信信号は、整合回路用マイクロストリップライン７によ
り入出力インピーダンスの補正が行なわれている表面弾
性波フィルタ４を通過し、アンテナ端子１より出力され
る。又、アンテナ端子１より入力された受信信号は、誘
電体フィルタ５を通過し、受信系端子３へ出力される。The transmission signal input into the duplexer from the transmission system terminal 2 passes through the surface acoustic wave filter 4 whose input / output impedance is corrected by the matching circuit microstrip line 7, and the antenna terminal 1 Will be output. The reception signal input from the antenna terminal 1 passes through the dielectric filter 5 and is output to the reception system terminal 3.
【００１２】本発明の一実施例を示す分波器の斜視図を
図２に示す。この分波器は、誘電体フィルタ５、表面弾
性波フィルタ４と基板１０，１１を金属ケース１２によ
りシールドし、パッケージ化している。マイクロストリ
ップライン８は基板１０，１１に配置され、整合回路用
マイクロストリップライン７は基板１０上面に配置され
ている。この表面弾性波フィルタ４の整合回路は、簡略
化されるためマイクロストリップライン７のみとなり小
型化されている。FIG. 2 is a perspective view of a duplexer showing an embodiment of the present invention. In this duplexer, the dielectric filter 5, the surface acoustic wave filter 4, and the substrates 10 and 11 are shielded by a metal case 12 and packaged. The microstrip line 8 is arranged on the substrates 10 and 11, and the matching circuit microstrip line 7 is arranged on the upper surface of the substrate 10. Since the matching circuit of the surface acoustic wave filter 4 is simplified, only the microstrip line 7 is provided and the size is reduced.
【００１３】又、本実施例における表面弾性波フィルタ
４は面実装タイプであり、一層の小型化に寄与してい
る。Further, the surface acoustic wave filter 4 in this embodiment is a surface mounting type, which contributes to further miniaturization.
【００１４】[0014]
【発明の効果】本発明によれば、従来の分波器に比べて
容積が小さく、かつ、安定した性能をもつ小型分波器を
構成し、無線通信機を小型化することができる。According to the present invention, a compact duplexer having a volume smaller than that of a conventional duplexer and having stable performance can be configured to downsize a radio communication device.
【図１】本発明の一実施例を示す分波器の回路図、FIG. 1 is a circuit diagram of a duplexer showing an embodiment of the present invention,
【図２】本発明の一実施例を示す分波器の斜視図。FIG. 2 is a perspective view of a duplexer showing an embodiment of the present invention.
【符号の説明】 １…アンテナ端子、２…送信系端子、３…受信系端子、
４…表面弾性波フィルタ、５…誘電体フィルタ、６…誘
電体共振子、７…整合回路用マイクロストリップライ
ン、８…マイクロストリップライン、９…アース端子。[Explanation of Codes] 1 ... Antenna terminal, 2 ... Transmission system terminal, 3 ... Reception system terminal,
4 ... Surface acoustic wave filter, 5 ... Dielectric filter, 6 ... Dielectric resonator, 7 ... Matching circuit microstrip line, 8 ... Microstrip line, 9 ... Ground terminal.
Claims (2)
る分波器において、前記送信フィルタあるいは前記受信
フィルタのいずれか一方に誘電体フィルタを用い、他方
に表面弾性波フィルタを用いたことを特徴とする分波
器。1. A duplexer comprising a transmission filter and a reception filter, wherein a dielectric filter is used for either the transmission filter or the reception filter, and a surface acoustic wave filter is used for the other. A branching filter.
記受信フィルタを小型の同一パッケージ内に構成した分
波器。2. The duplexer according to claim 1, wherein the transmission filter and the reception filter are formed in a single small package.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3256304A JPH0595204A (en) | 1991-10-03 | 1991-10-03 | Duplexer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3256304A JPH0595204A (en) | 1991-10-03 | 1991-10-03 | Duplexer |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0595204A true JPH0595204A (en) | 1993-04-16 |
Family
ID=17290806
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP3256304A Pending JPH0595204A (en) | 1991-10-03 | 1991-10-03 | Duplexer |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0595204A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH06350307A (en) * | 1993-06-03 | 1994-12-22 | Fuji Elelctrochem Co Ltd | Duplexer |
| US6308051B1 (en) * | 1997-10-17 | 2001-10-23 | Murata Manufacturing Co., Ltd. | Antenna duplexer |
| US6483399B1 (en) | 1999-09-21 | 2002-11-19 | Murata Manufacturing Co., Ltd. | Duplexer and communication apparatus with first and second filters, the second filter having plural switch selectable saw filters |
-
1991
- 1991-10-03 JP JP3256304A patent/JPH0595204A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH06350307A (en) * | 1993-06-03 | 1994-12-22 | Fuji Elelctrochem Co Ltd | Duplexer |
| US6308051B1 (en) * | 1997-10-17 | 2001-10-23 | Murata Manufacturing Co., Ltd. | Antenna duplexer |
| US6483399B1 (en) | 1999-09-21 | 2002-11-19 | Murata Manufacturing Co., Ltd. | Duplexer and communication apparatus with first and second filters, the second filter having plural switch selectable saw filters |
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