JPH02206201A - Band pass filter - Google Patents
Band pass filterInfo
- Publication number
- JPH02206201A JPH02206201A JP2631989A JP2631989A JPH02206201A JP H02206201 A JPH02206201 A JP H02206201A JP 2631989 A JP2631989 A JP 2631989A JP 2631989 A JP2631989 A JP 2631989A JP H02206201 A JPH02206201 A JP H02206201A
- Authority
- JP
- Japan
- Prior art keywords
- wavelength
- coupling section
- lines
- line
- microstrip line
- 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
- 230000008878 coupling Effects 0.000 claims abstract description 19
- 238000010168 coupling process Methods 0.000 claims abstract description 19
- 238000005859 coupling reaction Methods 0.000 claims abstract description 19
- 230000005540 biological transmission Effects 0.000 claims abstract description 17
- 238000010586 diagram Methods 0.000 description 4
- 239000004809 Teflon Substances 0.000 description 2
- 229920006362 Teflon® Polymers 0.000 description 2
- 239000000758 substrate Substances 0.000 description 2
- 238000001914 filtration Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
Landscapes
- Control Of Motors That Do Not Use Commutators (AREA)
Abstract
Description
【発明の詳細な説明】
〔発明の目的〕
（産業上の利用分野）
本発明は分布定数型帯域通過濾波器に関づるものである
。DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Field of Industrial Application) The present invention relates to a distributed constant type bandpass filter.
（従来の技術）
従来、マイクロストリップ線路を用いた分布定数型帯域
通過濾波器としては、第５図に示すようなものがある。(Prior Art) Conventionally, there is a distributed constant type bandpass filter using a microstrip line as shown in FIG.
同図に示されるように、この帯域通過濾波器は、５木の
マイクロストリップライン１，２，３．４．５を平行に
並べることにより各マイクロストリップライン１と２お
よび２と３および３と４および４と５の間にそれぞれ１
／４波長結合部５．６，７．８を形成し、ストリップ。As shown in the figure, this bandpass filter is constructed by arranging five microstrip lines 1, 2, 3, 4, and 5 in parallel. 4 and 1 each between 4 and 5
/4 wavelength coupling portions 5.6, 7.8 are formed and stripped.
ライン１に入力部１ａを形成し、ストリブライン５に出
力部５ａを形成して構成される。この分布定数型帯域通
過濾波器（よ、各１／４波長結合部５゜６．７．８で、
入力部１ａから入力された信号のうち共振する周波数の
みが選択されて出力部５ａから出力され、これによって
周波数の帯域濾波が行われる
（発明が解決しようとする課題）
しかしながら、このような従来の帯域通過濾波器では、
各１／４波長結合部の長さを１とすると濾波器の全長し
がＬ＝４Ｊ）となり、濾波器自体が大きくなるという不
都合があった。The input section 1a is formed on the line 1, and the output section 5a is formed on the strib line 5. This distributed constant type bandpass filter (with each 1/4 wavelength coupling section 5°6.7.8,
Only the resonant frequency of the signal input from the input section 1a is selected and output from the output section 5a, thereby performing frequency bandpass filtering (problem to be solved by the invention). In a bandpass filter,
If the length of each 1/4 wavelength coupling part is 1, the total length of the filter becomes L=4J), which is disadvantageous in that the filter itself becomes large.
例えば、通過周波数をＩＧＨｚとし、０．８ｍ〔登Ｂ商
標〕
ｍ厚のテフロン基板上に、上記のような４段の分布定数
型帯域通過濾波器を設計する場合を考えると、上記１／
４波長結合部の長さは約５５ｍｍとなり、結局濾波器の
全長は２２０ｍ’ｍと、かなり大きくなった。For example, if we assume that the pass frequency is IGHz and design a four-stage distributed constant bandpass filter as described above on a Teflon substrate with a thickness of 0.8 m [trademark B], the above 1/
The length of the four-wavelength coupling section was approximately 55 mm, and the total length of the filter was 220 mm, which was quite large.
このため、従来は共振器を平行に配置するのではなく、
斜めに配置したり、くの字型に曲げるといったようなこ
とが行われたが、このようにしても、全長りをさして短
縮することはできなかった。For this reason, conventionally, instead of arranging the resonators in parallel,
Attempts were made to place it diagonally or bend it into a dogleg shape, but even with these methods, it was not possible to significantly shorten the entire length.
また、特公昭６０−４１８８１には、共振器ＩＪをＵ字
型あるいは別の型に曲げてスペースの有効利用を図るよ
うにしと構成が示されているが、この特公昭６０−４１
８８１のものでは濾波器の設計が繁雑になるという問題
点があった。Furthermore, in Japanese Patent Publication No. 60-41881, a configuration is shown in which the resonator IJ is bent into a U-shape or another shape to make effective use of space.
The problem with the 881 was that the filter design was complicated.
本発明はこのような問題点に顧みてなされたもので、そ
の目的とするところは、装置自体が小型であり又構成が
簡単な帯域通過濾波器を提供することにある。The present invention has been made in consideration of these problems, and its purpose is to provide a bandpass filter that is compact in size and has a simple configuration.
（１１明の構成〕
（課題を解決するための手段）
上記目的を達成するために本発明では、通過信号の波長
に関して、１／４波長の長さで互いに結合する２つの線
路によって形成された１／４波長結合部を複数段設けた
分布定数型帯域通過濾波器において、前記各段の段間に
曲折した所定の特性インピーダンスを有する伝送路を挿
入したことを特徴とする。(11 Bright Configuration) (Means for Solving the Problems) In order to achieve the above object, the present invention provides a transmission line formed by two lines coupled to each other with a length of 1/4 wavelength with respect to the wavelength of the passing signal. A distributed constant bandpass filter having a plurality of stages of quarter-wavelength coupling sections is characterized in that a bent transmission line having a predetermined characteristic impedance is inserted between each stage.
（作用）
各段の段間に曲折した所定の特性インピーダンスを有す
る伝送路を挿入したことにより８置自体が小型化される
。(Function) By inserting a bent transmission line having a predetermined characteristic impedance between each stage, the 8-position itself is miniaturized.
（実施例） 以下図面に基いて、本光明の実施例を詳細に説明する。(Example) Embodiments of the present invention will be described in detail below with reference to the drawings.
第１図は本発明の一実施例に係る帯域通過濾波器を示し
たものである。この実施例の帯域通過濾波器は、所望の
通過信号の波長をλとするとき、λ／４の長さの１／４
波長マイクロストリップライン１１、互いに平行に配設
された２本の１／４波長マイクロストリツプライン１３
ａ。FIG. 1 shows a bandpass filter according to an embodiment of the present invention. The bandpass filter of this embodiment has a length of 1/4 of λ/4, where λ is the wavelength of the desired passing signal.
Wavelength microstrip line 11, two 1/4 wavelength microstrip lines 13 arranged parallel to each other
a.
１３ｂを所定の特性インピーダンスを有する伝送線路１
３ｃで接続した０字型マイクロストリップライン１３、
互いに平行に配設された２本の１／４波長マイクロスト
リツプライン１４ａ、１４ｂを所定の特性インピーダン
スを有する伝送線路１４Ｃで接続した１字型マイクロス
トリップライン１４、互いに平行に配設された２本の１
／４波長マイクロストリツプライン１５ａ、１５ｂを所
定の特性インピーダンスを有する伝送線路１５ｃで接続
したＵ字型マイクロス！・リップライン１５およびマイ
クロストリップライン１２から構成され、１／４波長マ
イクロストリツプライン１１と１／４波長マイクロスト
リツプライン１３ａとの間に１／４波長結合部１６が形
成され、１／４波長マイクロストリツプライン１３ｂと
１／４波長マイクロストリツプライン１４ａとの間に１
／４波長結合部１７が形成され、１／４波長マイクロス
トリツプライン１４ｂと１／４波長マイクロストリツプ
ライン１５ａとの間に１／４波長結合部１８が形成され
、１／４波長マイクロストリツプライン１５ｂと１７４
波長マイクロストリツプライン１２との間に１／４波長
結合部１９が形成され、更に、１／４波艮マイクロス］
・リップライン１１に入力部１１ａが設けられ、１／４
波長マイクロスＩ・リップライン１２に出力部１２ａが
設けられる。13b is a transmission line 1 having a predetermined characteristic impedance.
0-shaped microstrip line 13 connected with 3c,
A single-shaped microstrip line 14 in which two quarter-wavelength microstrip lines 14a and 14b arranged parallel to each other are connected by a transmission line 14C having a predetermined characteristic impedance; Book 1
/4-wavelength microstrip lines 15a and 15b are connected by a transmission line 15c having a predetermined characteristic impedance! - Consisting of a lip line 15 and a microstrip line 12, a 1/4 wavelength coupling section 16 is formed between the 1/4 wavelength microstrip line 11 and the 1/4 wavelength microstrip line 13a, and the 1/4 1 between the wavelength microstrip line 13b and the 1/4 wavelength microstrip line 14a.
A quarter wavelength coupling section 17 is formed, a quarter wavelength coupling section 18 is formed between the quarter wavelength microstrip line 14b and the quarter wavelength microstrip line 15a, and a quarter wavelength coupling section 18 is formed between the quarter wavelength microstrip line 14b and the quarter wavelength microstrip line 15a. Rip lines 15b and 174
A 1/4 wavelength coupling section 19 is formed between the wavelength microstrip line 12, and a 1/4 wavelength coupling section 19 is further formed between the wavelength microstrip line 12 and the 1/4 wavelength microstrip line 12.
- An input section 11a is provided on the lip line 11, and 1/4
The wavelength micros I lip line 12 is provided with an output section 12a.
ここで、通過帯域を１ＧＨｚに設定し、上記構成の濾波
器を例えば０．８ｍｍ厚のテフロン基板上に形成する場
合を考えると、１／４波長マイクロストリツプライン１
１，１２．１３ａ、１３ｂ。Here, if we consider the case where the passband is set to 1 GHz and the filter with the above configuration is formed on a Teflon substrate with a thickness of 0.8 mm, for example, 1/4 wavelength microstrip line 1
1, 12.13a, 13b.
１４ａ、１４ｂ、１５ａ、１５ｂの長さｊｌはそれぞれ
約５５ｍｍとなる。また、０字型マイクロストリップラ
イン１３．１４．１５の伝送線路１３ｃ、１４ｃ、１５
ｃの特性インピーダンスを５０Ωとすると、各伝送路１
３ｃ、１４ｃ、１５ｃの幅は約２．５ｍ菌となり、結局
、濾波器の全長Ｌ１は約６０ｍｍとなる。The length jl of each of 14a, 14b, 15a, and 15b is about 55 mm. In addition, the transmission lines 13c, 14c, 15 of the 0-shaped microstrip line 13, 14, 15
If the characteristic impedance of c is 50Ω, each transmission line 1
The widths of 3c, 14c, and 15c are approximately 2.5 m, and the total length L1 of the filter is approximately 60 mm.
このようにこの実施例の帯域通過濾波器では、濾波器の
全長Ｌ を略１１に等しくすることかでき、装置の小型
化を図ることができる。In this way, in the band-pass filter of this embodiment, the total length L of the filter can be made approximately equal to 11, and the device can be made smaller.
なお、このような伝送線路１３ｃ、１４ｃ、１５Ｃを挿
入すると、この伝送線路の長さに応じて各１／４波長結
合部における共振周波数が低くなる。この影響を小さく
するには、例えば第２図に示すように、伝送線路１３ｃ
、１４ｃ、１５ｃの半分の長さａ／２だけ１／４波長マ
イクロストリツプライン１の長さＪｌｌを短く設計する
ようにすればよい。Note that when such transmission lines 13c, 14c, and 15C are inserted, the resonant frequency at each quarter-wavelength coupling portion becomes lower depending on the length of the transmission line. In order to reduce this influence, for example, as shown in FIG.
, 14c, 15c, the length Jll of the 1/4 wavelength microstrip line 1 may be designed to be shorter by half the length a/2 of 14c, 15c.
第３図は、本発明の他の実施例を示すもので、この実施
例では、長さ１の１／４波長マイクロストリツプライン
２１．２２に隣接して長さが略その倍のマイクロストリ
ップライン２３．２４を設け、さらにマイクロストリッ
プライン２３．２４の間に０字型の伝送マイクロストリ
ップライン２５を設けたものである。本実施例において
は、濾波器の長さしをＬ＝２ｊ程度に押えることができ
る。FIG. 3 shows another embodiment of the present invention, in which a quarter-wave microstrip line 21, 22 of length 1 is adjacent to a microstrip line 21, 22 of approximately twice the length. Lines 23 and 24 are provided, and a 0-shaped transmission microstrip line 25 is further provided between the microstrip lines 23 and 24. In this embodiment, the length of the filter can be kept to about L=2j.
また、この実施例において、マイクロストリップライン
２５をＵ字状ではなく、扇形に問いた状態に形成するこ
とにより、入力信号の方向と出力信号の方向を任意に設
定できる。Furthermore, in this embodiment, by forming the microstrip line 25 not in a U-shape but in a fan-shape, the direction of the input signal and the direction of the output signal can be set arbitrarily.
第４図は、本発明の更に他の実施例を表すもので、同図
に示されるように、１／４波長マイクロストリツプライ
ン３１．３５間にかぎ型のマイクロストリップライン３
２，３３．３４を階段状に配置する。この実施例でも、
全長りをＬ＝２ｊ程度に押えることができる。また、こ
の実施例では入力信号の方向と出力信号の方向とを９０
度に設定することができる。FIG. 4 shows still another embodiment of the present invention, in which a hook-shaped microstrip line 31 and 35 are interposed between 1/4 wavelength microstrip lines 31 and 35.
2, 33, and 34 are arranged in a stepwise manner. Also in this example,
The total length can be kept to about L=2j. Further, in this embodiment, the direction of the input signal and the direction of the output signal are set at 90°.
Can be set at any time.
以上詳細に説明したように本発明によれば、非常に簡単
な構成により帯域通過濾波器の小型化を図ることができ
る。As described above in detail, according to the present invention, it is possible to downsize the bandpass filter with a very simple configuration.
第１図は、本発明の一実施例に係る帯域通過濾波器の構
成図、第２図はその拡大図、第３図は本発明の他の実施
例に係る帯域通過濾波器の構成図、第４図は本発明の更
に他の実施例に係る帯域通過濾波器の構成図、第５図は
従来の帯域通過濾波器の構成図である。
１．５，１１．１２，２１，２２．３１．３５・・・１
／４波長マイクロストリツプライン、１３ｃ。
１４ｃ、１５ｃ・・・伝送線路。
第１図
第２図
第３図
第４図FIG. 1 is a block diagram of a band-pass filter according to an embodiment of the present invention, FIG. 2 is an enlarged view thereof, and FIG. 3 is a block diagram of a band-pass filter according to another embodiment of the present invention. FIG. 4 is a block diagram of a band pass filter according to still another embodiment of the present invention, and FIG. 5 is a block diagram of a conventional band pass filter. 1.5, 11.12, 21, 22.31.35...1
/4 wavelength microstrip line, 13c. 14c, 15c...transmission line. Figure 1 Figure 2 Figure 3 Figure 4
Claims (3)
いに結合する２つの線路によつて形成された１／４波長
結合部を複数段設けた分布定数型帯域通過濾波器におい
て、 前記各段の段間に曲折した所定の特性インピーダンスを
有する伝送路を挿入したことを特徴とする帯域通過濾波
器。(1) Regarding the wavelength of a passing signal, in a distributed constant bandpass filter having a plurality of stages of 1/4 wavelength coupling sections formed by two lines that are coupled to each other with a length of 1/4 wavelength, the above-mentioned A bandpass filter characterized in that a bent transmission line having a predetermined characteristic impedance is inserted between each stage.
（１）記載の帯域通過濾波器。(2) The bandpass filter according to claim (1), wherein the transmission path is U-shaped.
（１）記載の帯域通過濾波器。(3) The bandpass filter according to claim (1), wherein the transmission path is key-shaped.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2631989A JPH02206201A (en) | 1989-02-03 | 1989-02-03 | Band pass filter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2631989A JPH02206201A (en) | 1989-02-03 | 1989-02-03 | Band pass filter |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH02206201A true JPH02206201A (en) | 1990-08-16 |
Family
ID=12190072
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2631989A Pending JPH02206201A (en) | 1989-02-03 | 1989-02-03 | Band pass filter |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH02206201A (en) |
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0349301A (en) * | 1989-07-17 | 1991-03-04 | Nec Corp | Band pass filter |
| JPH04116404U (en) * | 1991-03-30 | 1992-10-19 | 太陽誘電株式会社 | Micro strip line filter |
| US5986525A (en) * | 1996-11-08 | 1999-11-16 | Murata Manufacturing Co., Ltd. | Filter device having a distributed-constant-line-type resonator |
| US6559741B2 (en) * | 2000-04-27 | 2003-05-06 | Kyocera Corporation | Distributed element filter |
| US6895262B2 (en) | 1993-05-28 | 2005-05-17 | Superconductor Technologies, Inc. | High temperature superconducting spiral snake structures and methods for high Q, reduced intermodulation structures |
| US6995635B2 (en) * | 2004-02-26 | 2006-02-07 | Chung Shan Institute Of Science And Technology | Microstrip line parallel-coupled-resonator filter with open-and-short end |
| US7231238B2 (en) | 1989-01-13 | 2007-06-12 | Superconductor Technologies, Inc. | High temperature spiral snake superconducting resonator having wider runs with higher current density |
| CN102280678A (en) * | 2011-05-27 | 2011-12-14 | 华南理工大学 | Balanced radio frequency electrically tunable bandpass filter with constant relative bandwidth |
| CN103457007A (en) * | 2013-09-06 | 2013-12-18 | 南京理工大学 | High-performance distributed 3100-3400 MHz miniature band-pass filter |
-
1989
- 1989-02-03 JP JP2631989A patent/JPH02206201A/en active Pending
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7231238B2 (en) | 1989-01-13 | 2007-06-12 | Superconductor Technologies, Inc. | High temperature spiral snake superconducting resonator having wider runs with higher current density |
| JPH0349301A (en) * | 1989-07-17 | 1991-03-04 | Nec Corp | Band pass filter |
| JPH04116404U (en) * | 1991-03-30 | 1992-10-19 | 太陽誘電株式会社 | Micro strip line filter |
| US6895262B2 (en) | 1993-05-28 | 2005-05-17 | Superconductor Technologies, Inc. | High temperature superconducting spiral snake structures and methods for high Q, reduced intermodulation structures |
| US5986525A (en) * | 1996-11-08 | 1999-11-16 | Murata Manufacturing Co., Ltd. | Filter device having a distributed-constant-line-type resonator |
| US6559741B2 (en) * | 2000-04-27 | 2003-05-06 | Kyocera Corporation | Distributed element filter |
| US6995635B2 (en) * | 2004-02-26 | 2006-02-07 | Chung Shan Institute Of Science And Technology | Microstrip line parallel-coupled-resonator filter with open-and-short end |
| CN102280678A (en) * | 2011-05-27 | 2011-12-14 | 华南理工大学 | Balanced radio frequency electrically tunable bandpass filter with constant relative bandwidth |
| CN103457007A (en) * | 2013-09-06 | 2013-12-18 | 南京理工大学 | High-performance distributed 3100-3400 MHz miniature band-pass filter |
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