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JPH0595204A - Branching filter - Google Patents

Branching filter

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Publication number
JPH0595204A
JPH0595204A JP25630491A JP25630491A JPH0595204A JP H0595204 A JPH0595204 A JP H0595204A JP 25630491 A JP25630491 A JP 25630491A JP 25630491 A JP25630491 A JP 25630491A JP H0595204 A JPH0595204 A JP H0595204A
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JP
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Patent type
Prior art keywords
filter
microstrip
wave
acoustic
lines
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
Application number
JP25630491A
Other languages
Japanese (ja)
Inventor
Tetsuya Hirashima
Kazuhito Kurosawa
哲也 平島
和仁 黒沢
Original Assignee
Hitachi Ltd
株式会社日立製作所
Priority date (The priority date 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 date listed.)
Filing date
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Abstract

PURPOSE:To form a small-sized branching filter whose volume is small with stable performance by using a dielectric filter for one of filter and a surface acoustic wave filter for the other in a dielectric filter composed of a transmission filter and a reception filter. CONSTITUTION:A transmission signal inputted from a transmission system terminal 2 into the branching filter passes through a surface acoustic wave filter 4 whose input/output impedance is corrected by matching circuit microstrip lines 7 and the result is outputted from an antenna terminal 1. Moreover, a reception signal inputted from the antenna terminal 1 is given to a dielectric filter 5, the surface acoustic wave filter 4 whose boards 10, 11 are shielded by a metallic case 12 and which are formed to be a module. Microstrip lines 8 are arranged to the boards 10, 11 and the matching circuit use microstrip lines 7 are arranged on the upper side of the board 10. Since the matching circuit of the surface acoustic wave filter 4 is simplified to employ the microstrip lines 7 only, the filter is miniaturized.

Description

【発明の詳細な説明】 DETAILED DESCRIPTION OF THE INVENTION

【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。 The present invention relates to a duplexer used in wireless communications equipment and 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。 A conventional duplexer, as described in the 1986 Institute of Electronics and Communication Engineers General National Convention article 743 "800MHz band dielectric filling small demultiplexer", dielectric in both of the receive filter and the transmit filter I had been using 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。 [0003] Alternatively, as described in JP-A-63-54009, have used surface acoustic wave filter in both the reception filter and transmission 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。 [SUMMARY OF THE INVENTION In recent years, rapid progress miniaturization of radio communication equipment, a high stability to basic at high frequencies in response to which also the demultiplexer, it is required that a small . 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。 However, both a duplexer has a dielectric filter and receive conventional transmission filter filters a large volume of individual dielectric filter, the volume is also increased when the structure duplexer.

【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。 [0005] Also, the conventional transmission filter and the duplexer have used surface acoustic wave filter in both of the receive filter, while the volume of the individual surface acoustic wave filter small, requires peripheral circuits, including the peripheral circuit volume when configuring the demultiplexer in the same packages designed increases. 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。 This generally be input and output impedance in the pass band in the surface acoustic wave filter is not so equal to the characteristic impedance, and, by the input and output impedance of the pass band attenuation band does not become completely reactance, adding a peripheral circuit This is because it is necessary to carry out the impedance correction is. 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。 At the same time, transmit filter, receive filter, respectively for the passband of one filter is outside the pass band attenuation band of the other filter, the deviation in the input and output impedance of one filter by the characteristic variation or the like occurs, the other filter of it affects the characteristics, if by adding a peripheral circuit is performed impedance correction easily lag behind input and output impedance of one filter, also tends to affect the characteristics of the other filter to give the desired performance sometimes not.

【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 configure a duplexer having a small size, and stable performance as can sufficiently correspond to the size of the 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。 To achieve the above object, according to an aspect of the present invention is branched into the transmission filter or a dielectric filter in one of the reception filter, the same package with a surface acoustic wave filter to the other vessel constitutes a.

【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。 [Action] by the above method, one of the filter peripheral circuit for a dielectric filter is unnecessary, the deviation in input and output impedance is less likely to occur. 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。 Whereby for the other surface acoustic wave filter requires only one simple peripheral circuits added, the volume is not only smaller, and less susceptible to dielectric filter can have stable performance. 即ち、容積が小さく、かつ安定した性能をもつ、 That is, the volume is small and has stable performance,
小型分波器を構成することができる。 It is possible to construct a compact duplexer.

【0009】 [0009]

【実施例】以下、本発明の一実施例を図により説明する。 BRIEF DESCRIPTION by Figure an embodiment of the present invention.

【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。 [0010] The circuit diagram of a duplexer of an embodiment of the present invention shown in FIG. 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。 The duplexer, a dielectric filter 5 to the receiving filter, constitute a duplexer using the surface acoustic wave filter 4 to the transmission filter. 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。 Surface acoustic wave filter 4 is made to correct the input and output impedance microstrip line 7 for matching. 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。 The transmission surface acoustic wave filter 4 is a filter structure for power handling capability, in terms of transmission power is large, the fine electrode pattern of the surface acoustic wave filters, heat generation, destruction due to migration or the like need not be a problem.

【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。 [0011] The transmission signal input to the transmission system terminal 2 from the demultiplexer in passes through the surface acoustic wave filter 4 is made to correct the input and output impedance by the matching circuit microstrip line 7, the antenna terminal 1 It is more output. 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。 Further, the received signal input from the antenna terminal 1 passes through the dielectric filter 5, output to the reception system terminals 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。 [0012] The perspective view of the duplexer of an embodiment of the present invention shown in FIG. 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。 The duplexer, the dielectric filter 5, a surface acoustic wave filter 4 and the substrate 10, 11 shielded by the metal case 12 is packaged. 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。 Microstrip line 8 is disposed on the substrate 10 and 11, the matching circuit microstrip line 7 is disposed on the substrate 10 upper surface. 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。 Matching circuit of the surface acoustic wave filter 4 is miniaturized becomes only microstrip line 7 to be simplified.

【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。 [0013] The surface acoustic wave filter 4 in this embodiment is a surface mount 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 small volume as compared with the conventional duplexer, and constitute a compact duplexer having stable performance, it is possible to downsize the wireless communication device.

【図面の簡単な説明】 BRIEF DESCRIPTION OF THE DRAWINGS

【図1】本発明の一実施例を示す分波器の回路図、 Circuit diagram of a duplexer of an embodiment of the invention, FIG,

【図2】本発明の一実施例を示す分波器の斜視図。 Perspective view of a duplexer of an embodiment of the present invention; FIG.

【符号の説明】 1…アンテナ端子、2…送信系端子、3…受信系端子、 [Description of Reference Numerals] 1 ... antenna terminal, 2 ... transmission system terminals, 3 ... receiving system terminal,
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。 4 ... the surface acoustic wave filter, 5 ... dielectric filter, 6 ... dielectric resonator, 7 ... a microstrip line for matching circuit, 8 ... microstrip line, 9 ... ground terminal.

Claims (2)

    【特許請求の範囲】 [The claims]
  1. 【請求項1】送信フィルタ、受信フィルタから構成される分波器において、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 transmission filter, in composed demultiplexer from the reception filter, a dielectric filter on one of the transmission filter or the reception filter, and characterized by using the surface acoustic wave filter to the other demultiplexer that.
  2. 【請求項2】請求項1において、前記送信フィルタと前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. A according to claim 1, duplexer constitutes the reception filter and the transmission filter in the compact of the same package.
JP25630491A 1991-10-03 1991-10-03 Branching filter Pending JPH0595204A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP25630491A JPH0595204A (en) 1991-10-03 1991-10-03 Branching filter

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP25630491A JPH0595204A (en) 1991-10-03 1991-10-03 Branching filter

Publications (1)

Publication Number Publication Date
JPH0595204A true true JPH0595204A (en) 1993-04-16

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Family Applications (1)

Application Number Title Priority Date Filing Date
JP25630491A Pending JPH0595204A (en) 1991-10-03 1991-10-03 Branching filter

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JP (1) JPH0595204A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH06350307A (en) * 1993-06-03 1994-12-22 Fuji Elelctrochem Co Ltd Branching device
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

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH06350307A (en) * 1993-06-03 1994-12-22 Fuji Elelctrochem Co Ltd Branching device
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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