JPS6242522B2 - - Google Patents
Info
- Publication number
- JPS6242522B2 JPS6242522B2 JP7145680A JP7145680A JPS6242522B2 JP S6242522 B2 JPS6242522 B2 JP S6242522B2 JP 7145680 A JP7145680 A JP 7145680A JP 7145680 A JP7145680 A JP 7145680A JP S6242522 B2 JPS6242522 B2 JP S6242522B2
- Authority
- JP
- Japan
- Prior art keywords
- filter
- frequency
- attenuation
- stub
- wavelength
- 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.)
- Expired
Links
- 230000005540 biological transmission Effects 0.000 claims description 11
- 230000001939 inductive effect Effects 0.000 claims description 8
- 238000010586 diagram Methods 0.000 description 7
- 230000008878 coupling Effects 0.000 description 4
- 238000010168 coupling process Methods 0.000 description 4
- 238000005859 coupling reaction Methods 0.000 description 4
- 230000000903 blocking effect Effects 0.000 description 2
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01P—WAVEGUIDES; RESONATORS, LINES, OR OTHER DEVICES OF THE WAVEGUIDE TYPE
- H01P1/00—Auxiliary devices
- H01P1/20—Frequency-selective devices, e.g. filters
- H01P1/201—Filters for transverse electromagnetic waves
- H01P1/203—Strip line filters
- H01P1/2039—Galvanic coupling between Input/Output
Description
【発明の詳細な説明】
この発明は、マイクロストリツプ線路を用いて
構成したストリツプ線路フイルタに関するもので
ある。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a stripline filter constructed using microstrip lines.
マイクロストリツプ線路を基本構成とするマイ
クロ波の平面回路において、第１図に示す帯域遮
断フイルタがよく使用される。これは、１／２波長の
長さの両端開放線路からなる共振器１の端から１／４
波長の長さの部分を伝送線路２に結合の空隙３を
設けて平行に接近させて構成するもので、共振器
１の共振周波数で大きな減衰が得られる帯域遮断
フイルタとなる。第２図に、このフイルタの特性
を示す。このフイルタは、結合の空隙３を小さく
することにより第２図の特性４のように減衰量を
大きくできるが、フイルタの結合帯域が広がつ
て、阻止したい周波数１の減衰は大きくなる
が、阻止したくない周波数２の減衰も増すとい
う欠点をもつている。そこで、このフイルタの設
計は、阻止したくない周波数２で結合がなくな
る特性５を用いるが、この時阻止したい周波数
１の減衰量も小さくなつてしまう。即ち、従来の
上記構成のフイルタでは、阻止周波数１と阻止
しない周波数２が近い場合、希望する減衰量が
作れないという欠点をもつていた。 In a microwave planar circuit whose basic configuration is a microstrip line, a band cutoff filter shown in FIG. 1 is often used. This is constructed by making a 1/4 wavelength portion from the end of a resonator 1 consisting of a 1/2 wavelength open line at both ends parallel to the transmission line 2 with a coupling gap 3 provided. This makes it a band-cut filter that can obtain large attenuation at the resonant frequency of the resonator 1. Figure 2 shows the characteristics of this filter. This filter can increase the amount of attenuation as shown in characteristic 4 in Figure 2 by reducing the coupling gap 3, but the coupling band of the filter expands and the attenuation of the frequency 1 that you want to block becomes large. This has the disadvantage that the attenuation of frequency 2 , which is not desired, also increases. Therefore, the design of this filter uses characteristic 5 where coupling disappears at frequency 2 , which is not desired to be blocked, but at this time, the frequency that is desired to be blocked is
The attenuation amount of 1 also becomes small. That is, the conventional filter having the above configuration has the disadvantage that when the blocking frequency 1 and the non-blocking frequency 2 are close to each other, the desired amount of attenuation cannot be produced.
この発明は、上述のような従来のストリツプ線
路フイルタの欠点を解決するためになされたもの
であり、従つてこの発明の目的は、通過帯域の減
衰が小さく、阻止帯域の減衰が大きいストリツプ
線路フイルタを提供することにある。従来のフイ
ルタ構成において、阻止帯域の減衰を大きくとる
と、通過帯域の減衰量が増した。これは、フイル
タを形成する共振器の残留容量と、残留インダク
タンスによるものであり、この発明ではこの残留
リアクタンスを打消すように構成したものであ
る。従つてこの発明の構成の要点は、１／２波長の長
さの終端開放線路の端から１／４波長の長さの部分を
伝送線路に平行に接近させ、該伝送線路におい
て、前記１／４波長の長さ部分の両端のどちらか一方
の位置に対すると共に、それとは反対の側にある
場所に、容量性あるいは誘導性のスタブを取り付
けることによりストリツプ線路フイルタを構成し
た点にある。 This invention was made in order to solve the above-mentioned drawbacks of the conventional stripline filter, and an object of the invention is to provide a stripline filter that has small attenuation in the passband and large attenuation in the stopband. Our goal is to provide the following. In conventional filter configurations, increasing the attenuation in the stopband increases the amount of attenuation in the passband. This is due to the residual capacitance and residual inductance of the resonator forming the filter, and the present invention is designed to cancel this residual reactance. Therefore, the main point of the configuration of the present invention is to bring a 1/4 wavelength portion from the end of the 1/2 wavelength open terminated line close to the transmission line in parallel, and to The stripline filter is constructed by attaching capacitive or inductive stubs to either end of a four-wavelength section and at the opposite end.
以下、この発明を図に示す実施例に従つて詳細
に説明する。第３図は、この発明の原理を説明す
るための説明図で、同図において端子６から伝送
線路２を見たインピーダンスと、端子７から伝送
線路２を見たインピーダンスは逆になる。即ち、
第４図のフイルタ特性説明図に示すように、帯域
阻止フイルタの中心周波数を０，０より低い
周波数をL，０より高い周波数をHとすると
第３図において、端子６から見たインピーダンス
は、周波数Lで容量性、周波数０で短絡、周
波数Hで誘導性のインピーダンスとなる。一
方、端子７から見たインピーダンスは、周波数
Lで誘導性、周波数０で開放、周波数Hで容量
性となる。従つて、周波数Lでの減衰を小さく
するには、伝送線路２において共振器１の中心の
位置で、共振器１と反対側に、誘導性スタブある
いは、端子７側の共振器１の端に対応した位置に
容量性スタブを接続することにより、フイルタの
残留のインピーダンスを打消し、周波数Lでの
減衰を小さくする。また、周波数Hでの減衰を
小さくするには、周波数Lの場合と逆のスタブ
を接続することにより、残留のインピーダンスを
打消すことができる。 Hereinafter, the present invention will be explained in detail according to embodiments shown in the drawings. FIG. 3 is an explanatory diagram for explaining the principle of the present invention. In the figure, the impedance when viewing the transmission line 2 from the terminal 6 and the impedance when viewing the transmission line 2 from the terminal 7 are opposite. That is,
As shown in the filter characteristic diagram in Figure 4, if the center frequency of the band rejection filter is 0 , the frequency lower than 0 is L , and the frequency higher than 0 is H , the impedance seen from terminal 6 in Figure 3 is: At frequency L it becomes capacitive, at frequency 0 it becomes a short circuit, and at frequency H it becomes inductive impedance. On the other hand, the impedance seen from terminal 7 is the frequency
It is inductive at L , open at frequency 0 , and capacitive at frequency H. Therefore, in order to reduce the attenuation at frequency L , at the center of the resonator 1 in the transmission line 2, install an inductive stub on the side opposite to the resonator 1, or at the end of the resonator 1 on the terminal 7 side. By connecting a capacitive stub at the corresponding position, the residual impedance of the filter is canceled and the attenuation at frequency L is reduced. Furthermore, in order to reduce the attenuation at frequency H , residual impedance can be canceled by connecting a stub opposite to that for frequency L.
第５図は、この発明の一実施例を示す回路パタ
ーン図であり、同図において、伝送線路２で、共
振器１の端に対応する位置で、しかも共振器１の
反対側に容量性スタブ８を接続した実施例が示さ
れている。この実施例の減衰特性を第６図に示
す。第６図において、特性９は、スタブ８を接続
する前の特性、特性１０は容量性スタブ８を接続
した時の特性で、中心周波数０の減衰量は変わ
らずに、それより低い周波数Lの減衰量が大幅
に小さくなつている。なお、このスタブ線路は終
端を短絡したり、開放にしたり、また、長さを変
えることにより、容量性にも誘導性にもなること
はよく知られている。また、第５図のスタブ８を
誘導性スタブにすることにより、高い周波数H
の減衰を小さくできることは、上記説明より明ら
かである。 FIG. 5 is a circuit pattern diagram showing an embodiment of the present invention. In the figure, a capacitive stub is inserted in the transmission line 2 at a position corresponding to the end of the resonator 1 and on the opposite side of the resonator 1. An example in which 8 are connected is shown. The attenuation characteristics of this embodiment are shown in FIG. In Fig. 6, characteristic 9 is the characteristic before connecting the stub 8, and characteristic 10 is the characteristic when the capacitive stub 8 is connected . The amount of attenuation has become significantly smaller. It is well known that this stub line can be made capacitive or inductive by short-circuiting or opening its terminal ends, or by changing its length. In addition, by making the stub 8 in Fig. 5 an inductive stub, high frequency H
It is clear from the above explanation that the attenuation of can be reduced.
以上説明した通りであるから、この発明によれ
ば、１／２波長共振器の１／４波長部分を伝送線路に接
近さ
せて構成する帯域阻止フイルタにおいて、上記フ
イルタ回路が形成された伝送線路の両端のどちら
か一方に容量性あるいは誘導性スタブを接続する
ことにより、阻止帯域の減衰量を変えることなく
阻止帯域に近い通過帯域の減衰量を小さくできる
という利点がある。 As explained above, according to the present invention, in a band rejection filter configured by bringing a 1/4 wavelength portion of a 1/2 wavelength resonator close to a transmission line, the transmission line on which the filter circuit is formed is By connecting a capacitive or inductive stub to either end, there is an advantage that the amount of attenuation in the pass band near the stop band can be reduced without changing the amount of attenuation in the stop band.
第１図は、従来のストリツプ線路フイルタの回
路パターンを示す平面図、第２図は、従来のフイ
ルタの特性を示す特性図、第３図は、この発明の
原理を説明するための説明図、第４図はフイルタ
特性の説明図、第５図はこの発明の一実施例を示
す平面図、第６図はこの発明によるフイルタの特
性例を示す特性図、である。
図において、１は１／２波長共振器、２は伝送線
路、３は空隙、８はスタブ、を示す。
FIG. 1 is a plan view showing the circuit pattern of a conventional strip line filter, FIG. 2 is a characteristic diagram showing the characteristics of the conventional filter, and FIG. 3 is an explanatory diagram for explaining the principle of the present invention. FIG. 4 is an explanatory diagram of filter characteristics, FIG. 5 is a plan view showing an embodiment of the present invention, and FIG. 6 is a characteristic diagram showing an example of the characteristics of the filter according to the present invention. In the figure, 1 is a 1/2 wavelength resonator, 2 is a transmission line, 3 is a gap, and 8 is a stub.
Claims (1)
トリツプ線路フイルタであつて、１／２波長の長さの 終端開放線路の端から１／４波長の長さの部分を伝送 線路に平行に接近させ、該伝送線路において、前
記１／４波長の長さ部分の両端のどちらか一方の位置 に対すると共に、それとは反対の側にある場所
に、容量性あるいは誘導性のスタブを取り付けて
成ることを特徴とするストリツプ線路フイルタ。[Scope of Claims] 1. A strip line filter configured using a microstrip line, in which a 1/4 wavelength portion from the end of a 1/2 wavelength open terminated line is used as a transmission line. A capacitive or inductive stub is installed in the transmission line at a position on either end of the 1/4 wavelength length portion and at a location on the opposite side thereof. A strip line filter characterized by comprising:
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7145680A JPS56168401A (en) | 1980-05-30 | 1980-05-30 | Strip line filter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7145680A JPS56168401A (en) | 1980-05-30 | 1980-05-30 | Strip line filter |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS56168401A JPS56168401A (en) | 1981-12-24 |
| JPS6242522B2 true JPS6242522B2 (en) | 1987-09-09 |
Family
ID=13461087
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP7145680A Granted JPS56168401A (en) | 1980-05-30 | 1980-05-30 | Strip line filter |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS56168401A (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3422899A1 (en) * | 1984-06-20 | 1986-01-02 | Siemens AG, 1000 Berlin und 8000 München | Planar circuit structure constructed as a filter circuit |
| JPH05299712A (en) * | 1992-04-22 | 1993-11-12 | Sumitomo Electric Ind Ltd | Microwave part |
| JPH09326602A (en) * | 1996-06-04 | 1997-12-16 | Atr Kodenpa Tsushin Kenkyusho:Kk | High frequency filter circuit |
| US6792299B2 (en) * | 2001-03-21 | 2004-09-14 | Conductus, Inc. | Device approximating a shunt capacitor for strip-line-type circuits |
-
1980
- 1980-05-30 JP JP7145680A patent/JPS56168401A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS56168401A (en) | 1981-12-24 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US5675301A (en) | Dielectric filter having resonators aligned to effect zeros of the frequency response | |
| US5497130A (en) | Layered transmission line filter with a capacitively coupled electrode in a layer opposing stripline resonators | |
| US5365209A (en) | Dielectric filters and duplexers incorporating same | |
| JP3531603B2 (en) | High frequency filter, filter device using the same, and electronic device using the same | |
| US4536725A (en) | Stripline filter | |
| CN105720337B (en) | The two band filter of substrate integration wave-guide complementary openings resonant ring and strip lines configuration | |
| US5291161A (en) | Microwave band-pass filter having frequency characteristic of insertion loss steeply increasing on one outside of pass-band | |
| JPS6242522B2 (en) | ||
| US4730173A (en) | Asymmetrical trap comprising coaxial resonators, reactance elements, and transmission line elements | |
| KR100392341B1 (en) | Band pass filter using DGS | |
| JP2718984B2 (en) | Resonator and filter using the resonator | |
| JP2583849B2 (en) | Stripline resonator | |
| JPH0669703A (en) | Dielectric resonance component | |
| JPS6126722B2 (en) | ||
| CN214625335U (en) | Dielectric filter | |
| JP2800478B2 (en) | Microwave filter | |
| CN113036325B (en) | Dielectric filter | |
| JPH051122Y2 (en) | ||
| JP2800479B2 (en) | Microwave filter | |
| JPS633212Y2 (en) | ||
| JP2671571B2 (en) | Microwave filter | |
| KR100557297B1 (en) | A dielectric band pass and duplexer filters having a micro-strip bandstop filter printed on filter main body | |
| JPH0718161Y2 (en) | Dielectric resonator type bandpass filter | |
| KR940007879B1 (en) | Voltage controlled band pass filter using dummy load | |
| JPS62157402A (en) | Dielectric filter |