JPH061841B2 - Interdigital filter - Google Patents
Interdigital filterInfo
- Publication number
- JPH061841B2 JPH061841B2 JP63266574A JP26657488A JPH061841B2 JP H061841 B2 JPH061841 B2 JP H061841B2 JP 63266574 A JP63266574 A JP 63266574A JP 26657488 A JP26657488 A JP 26657488A JP H061841 B2 JPH061841 B2 JP H061841B2
- Authority
- JP
- Japan
- Prior art keywords
- metal
- resonator
- band
- metal case
- interdigital filter
- 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 - Lifetime
Links
- 239000002184 metal Substances 0.000 claims description 44
- 230000008878 coupling Effects 0.000 description 6
- 238000010168 coupling process Methods 0.000 description 6
- 238000005859 coupling reaction Methods 0.000 description 6
- 230000000694 effects Effects 0.000 description 3
- 238000010586 diagram Methods 0.000 description 1
- 230000037431 insertion Effects 0.000 description 1
- 238000003780 insertion Methods 0.000 description 1
Landscapes
- Control Of Motors That Do Not Use Commutators (AREA)
Description
【発明の詳細な説明】 〔産業上の利用分野〕 本発明はマイクロ波帯やミリ波帯において使用されるイ
ンタディジタルフィルタの構造に関する。The present invention relates to a structure of an interdigital filter used in a microwave band or a millimeter wave band.
〔従来の技術〕 従来、マタクロ波帯やミリ波帯のような高周波帯におい
て使用されるインタディジタルフィルタは、約1/4波長
の長さで交互に片持梁構造とした共振器を備えた金属共
振器と、この金属共振器を挟む断面がコの字状の金属ケ
ースとで構成し、同軸モードで所望のバンドパスフィル
タ特性を得ている。[Prior Art] Conventionally, an interdigital filter used in a high frequency band such as a matacro wave band and a millimeter wave band has a cantilever structure resonator alternately having a length of about 1/4 wavelength. A metal resonator and a metal case having a U-shaped cross section sandwiching the metal resonator are provided to obtain a desired bandpass filter characteristic in the coaxial mode.
例えば、第２図（ａ）及び（ｂ）に従来のインタディジ
タルフィルタの構成例を示す。For example, FIGS. 2A and 2B show a configuration example of a conventional interdigital filter.
第２図（ａ）は縦断面図、同図（ｂ）はそのＣ−Ｃ線に
沿う断面図である。図において、１は約1/4波長の長さ
で交互に片持梁構造とした共振器２，及びアンテナ３を
備えた金属共振板である。また、４，５はこの金属共振
板１を挟む断面がコの字状の金属ケースであり、両金属
ケース４，５で方形導波管を構成している。そして、帯
域を可変するための結合調整のねじ６を一方の金属ケー
ス４に螺合させ、かつねじ６を前記共振器２の中間に位
置させている。FIG. 2 (a) is a vertical sectional view, and FIG. 2 (b) is a sectional view taken along the line CC. In the figure, reference numeral 1 is a metal resonator plate having a resonator 2 and an antenna 3, which are alternately cantilevered and have a length of about 1/4 wavelength. Further, reference numerals 4 and 5 are metal cases having a U-shaped cross section sandwiching the metal resonance plate 1, and both metal cases 4 and 5 form a rectangular waveguide. Then, a screw 6 for adjusting coupling for varying the band is screwed into one metal case 4, and the screw 6 is positioned in the middle of the resonator 2.
なお、金属ケース４，５，及び金属共振板１は電磁波が
漏えいしないように取り付けねじ等で組み立てられてい
る。The metal cases 4, 5 and the metal resonance plate 1 are assembled with mounting screws or the like so that electromagnetic waves do not leak.
上述した従来のインタディジタルフィルタでは、第２図
（ｂ）における寸法ｌ２、即ち金属共振板１と金属ケー
ス４，５によって構成される方形導波管の幅の寸法によ
り遮断周波数が決定されるため、遮断周波数より高い領
域でのバンドパスフィルタの帯域外減衰量が十分に得ら
れない。これに対処するためには金属共振板１や金属ケ
ース４，５を小さくする必要があるが、これでは所要の
共振周波数が得られなくなる。In the conventional interdigital filter described above, the cutoff frequency is determined by the dimension l 2 in FIG. 2B, that is, the width of the rectangular waveguide formed by the metal resonator plate 1 and the metal cases 4 and 5. Therefore, the out-of-band attenuation of the bandpass filter cannot be sufficiently obtained in the region higher than the cutoff frequency. In order to deal with this, it is necessary to make the metal resonance plate 1 and the metal cases 4 and 5 small, but this makes it impossible to obtain the required resonance frequency.
特に、容量を装荷するための帯域可変用結合調整ねじの
挿入量が大きくなった場合には、更に方形導波管の遮断
周波数が低くなり、バンドパスフィルタの帯域外減衰量
が更に得にくくなるという問題がある。In particular, when the insertion amount of the variable band coupling adjustment screw for loading the capacitance becomes large, the cutoff frequency of the rectangular waveguide becomes further low, and it becomes more difficult to obtain the out-of-band attenuation of the bandpass filter. There is a problem.
本発明は遮断周波数より高い領域での帯域外減衰量を確
保することができるインタディジタルフィルタを提供す
ることを目的とする。An object of the present invention is to provide an interdigital filter that can secure out-of-band attenuation in a region higher than the cutoff frequency.
本発明のインタディジタルフィルタは、金属ケースの内
壁に金属共振板の共振器の長手方向に沿って段部を形成
し、この段部により金属ケース内に画成される調整ねじ
を挟む部分の空洞の幅寸法を階段状に低減した構成とし
ている。In the interdigital filter of the present invention, a step portion is formed on the inner wall of the metal case along the longitudinal direction of the resonator of the metal resonator plate, and a cavity of a portion sandwiching the adjusting screw defined in the metal case by the step portion. The width dimension of is reduced stepwise.
上述した構成では、段部により金属ケース内の調整ねじ
を挟む部分の幅寸法を低減することで、同一の金属共振
板を使用した場合でも高周波側の帯域外における減衰量
を改善する。In the above-described configuration, the width dimension of the portion sandwiching the adjusting screw in the metal case is reduced by the step portion, so that the attenuation amount outside the high frequency band is improved even when the same metal resonator plate is used.
次に、本発明を図面を参照して説明する。 Next, the present invention will be described with reference to the drawings.
第１図は本発明の実施例を説明するための図であり、同
図（ａ）は平面方向の断面図，同図（ｂ）はそのＡ−Ａ
線に沿う断面図，同図（ｃ）はそのＢ−Ｂ線に沿う断面
図である。FIG. 1 is a diagram for explaining an embodiment of the present invention, in which FIG. 1 (a) is a sectional view in the plane direction, and FIG.
A sectional view taken along the line B, and FIG. 6C are sectional views taken along the line B-B.
これらの図において、１は約1/4波長の長さで交互に片
持梁構造とした共振器２，及びアンテナ３を備えた金属
共振板、４，５はこの金属共振板１を挟む断面がコの字
状の金属ケースであり、両金属ケース４，５で方形導波
管を構成している。また、帯域を可変するための結合調
整のねじ６を一方の金属ケース４に螺合させ、かつねじ
６を前記共振器２の中間に位置させている。In these figures, 1 is a metal resonator plate having a resonator 2 and an antenna 3 alternately having a cantilever structure with a length of about 1/4 wavelength, and 4 and 5 are cross sections sandwiching the metal resonator plate 1. Is a U-shaped metal case, and both metal cases 4 and 5 form a rectangular waveguide. Further, a screw 6 for adjusting coupling for varying the band is screwed into one metal case 4, and the screw 6 is positioned in the middle of the resonator 2.
そして、金属ケース４，５は金属共振板１を挟んで電磁
波が漏洩しないように取り付けねじ等で組み立てるとと
もに、前記帯域可変用結合調整ねじ６を螺合させた側の
金属ケース４の内壁に、共振器２の長手方向に沿って段
部４ａを形成し、段部４ａ間の幅寸法、換言すれば金属
ケースの空洞の幅寸法を階段状に狭くしている。即ち、
この幅寸法ｌ１を金属ケース４の本来の幅寸法ｌ２に対
して、ｌ１＜ｌ２となるように構成している。Then, the metal cases 4 and 5 are assembled with a mounting screw or the like so as to prevent the electromagnetic wave from leaking with the metal resonance plate 1 sandwiched therebetween, and the inner wall of the metal case 4 on which the band-variable coupling adjusting screw 6 is screwed, The step portion 4a is formed along the longitudinal direction of the resonator 2, and the width dimension between the step portions 4a, in other words, the width dimension of the cavity of the metal case is narrowed stepwise. That is,
The width dimension l 1 is configured such that l 1 <l 2 with respect to the original width dimension l 2 of the metal case 4.
この構成によれば、金属共振板１の共振器２における共
振により、中心周波数ｆ０での帯域減衰効果が得られる
のはもとより、ここでは帯域可変用結合調整ねじ６に最
も影響を与え易い金属ケース４の内壁幅を小さくしてい
るので、特に高周波側における帯域外減衰を増大するこ
とが可能となる。この結果、第３図に実線で示すように
高周波側での帯域外における減衰量を改善し、十分な帯
域外減衰を得ることを可能となる。これにより、従来と
同一の1/4波長共振器を有する金属共振板２を用いた場
合でも、帯域外減衰の高いフィルタが構成できる。According to this configuration, the resonance of the resonator 2 of the metal resonance plate 1 provides a band attenuation effect at the center frequency f 0 , and here, the metal that most easily affects the band adjustment coupling adjustment screw 6 is also used. Since the width of the inner wall of the case 4 is made small, it is possible to increase the out-of-band attenuation particularly on the high frequency side. As a result, as shown by the solid line in FIG. 3, it is possible to improve the amount of attenuation outside the band on the high frequency side and obtain sufficient out-of-band attenuation. As a result, even when the metal resonator plate 2 having the same 1/4 wavelength resonator as the conventional one is used, a filter with high out-of-band attenuation can be configured.
なお、第３図に破線で示す減衰特性は第２図に示した従
来構造のインタディジタルフィルタを示している。The attenuation characteristic shown by the broken line in FIG. 3 shows the interdigital filter of the conventional structure shown in FIG.
なお、前記実施例ではインタディジタルフィルタが２段
構成のものを示したが、本発明はそれ以外の各種段数の
フィルタに適用できることはもちろんである。Although the interdigital filter has a two-stage structure in the above-mentioned embodiment, the present invention can be applied to filters having various stages other than that.
以上説明したように本発明は、金属ケースの内壁に金属
共振板の共振器の長手方向に沿つて段部を形成し、この
段部により金属ケース内に画成される調整ねじを挟む部
分の空洞の幅寸法を階段状に低減しているので、同一の
金属共振板を使用した場合でも高周波側の帯域外におけ
る減衰量を改善することができる効果がある。As described above, according to the present invention, a step portion is formed on the inner wall of the metal case along the longitudinal direction of the resonator of the metal resonance plate, and the step portion forms a step for sandwiching the adjusting screw defined in the metal case. Since the width of the cavity is reduced stepwise, there is an effect that the attenuation amount outside the high frequency band can be improved even when the same metal resonator plate is used.
第１図（ａ）は本発明のインタディジタルフィルタの平
面方向の断面図、第１図（ｂ）は第１図（ａ）のＡ−Ａ
断面図、第１図（ｃ）は第１図（ｂ）のＢ−Ｂ断面図、
第２図（ａ）は従来のインタディジタルフィルタの縦方
向の断面図、第２図（ｂ）は第２図（ａ）のＣ−Ｃ断面
図、第３図はインタディジタルフィルタの減衰特性を示
す図である。 １…金属共振板、２…共振器、３…アンテナ、４，５…
金属ケース、４ａ…段部、６…帯域可変用結合調整ね
じ。FIG. 1 (a) is a cross-sectional view of the interdigital filter of the present invention in the plane direction, and FIG. 1 (b) is AA of FIG. 1 (a).
Sectional view, FIG. 1 (c) is a sectional view taken along line BB of FIG. 1 (b),
2 (a) is a longitudinal sectional view of a conventional interdigital filter, FIG. 2 (b) is a sectional view taken along the line CC of FIG. 2 (a), and FIG. 3 is an attenuation characteristic of the interdigital filter. FIG. 1 ... Metal resonance plate, 2 ... Resonator, 3 ... Antenna, 4, 5 ...
Metal case, 4a ... Step portion, 6 ... Band adjusting coupling adjusting screw.
Claims (1)
た共振器を有する金属共振板と、この金属共振板を挟ん
で内部に空洞を画成する金属ケースと、この金属ケース
に螺合されて空洞内への突出量が調整可能な帯域可変用
の調整ねじとで構成したインタディジタルフィルタにお
いて、前記共振器の長手方向に沿う金属ケースの内壁に
段部を形成し、この段部により前記調整ねじを挟む部分
の金属ケース内の幅寸法を階段状に低減したことを特徴
とするインタディジタルフィルタ。1. A metal resonator plate having a resonator having a cantilever structure alternately with a length of about 1/4 wavelength, a metal case defining a cavity inside with the metal resonator plate interposed therebetween, and In an interdigital filter configured with a band-variable adjusting screw that is screwed into a metal case and can adjust the amount of protrusion into the cavity, a step is formed on the inner wall of the metal case along the longitudinal direction of the resonator. An interdigital filter characterized in that the width dimension inside the metal case at the portion sandwiching the adjusting screw by this step portion is reduced stepwise.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63266574A JPH061841B2 (en) | 1988-10-22 | 1988-10-22 | Interdigital filter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63266574A JPH061841B2 (en) | 1988-10-22 | 1988-10-22 | Interdigital filter |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH02113602A JPH02113602A (en) | 1990-04-25 |
| JPH061841B2 true JPH061841B2 (en) | 1994-01-05 |
Family
ID=17432705
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP63266574A Expired - Lifetime JPH061841B2 (en) | 1988-10-22 | 1988-10-22 | Interdigital filter |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH061841B2 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP5481293B2 (en) * | 2010-07-12 | 2014-04-23 | 新日本無線株式会社 | Distributed line type bandpass filter |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS502445A (en) * | 1973-05-09 | 1975-01-11 |
-
1988
- 1988-10-22 JP JP63266574A patent/JPH061841B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPH02113602A (en) | 1990-04-25 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US4675631A (en) | Waveguide bandpass filter | |
| US4626809A (en) | Bandpass filter with dielectric resonators | |
| JPS59223001A (en) | Tunable microwave band erasing filter | |
| JPH01152801A (en) | Waveguide band-pass filter | |
| JPH061841B2 (en) | Interdigital filter | |
| US5418510A (en) | Cylindrical waveguide resonator filter section having increased bandwidth | |
| JPS63232602A (en) | Resonance filter | |
| JP2002359502A (en) | Dielectric resonator band-pass filter and reentrant cylndrical resonator band-pass filter | |
| JPS6390203A (en) | Dielectric filter | |
| JP3329235B2 (en) | filter | |
| JPH0220001B2 (en) | ||
| JPH0153923B2 (en) | ||
| JPS61159805A (en) | Cavity resonator | |
| JP2798539B2 (en) | Band stop filter | |
| JPS625530B2 (en) | ||
| JP3022163B2 (en) | Microwave filter | |
| JPH01173902A (en) | Dielectric filter | |
| JPS5952841B2 (en) | Dielectric line type filter | |
| JPH0595203A (en) | Coaxial resonator filter | |
| JPS627201A (en) | Dielectric resonator band pass-filter | |
| JPS6324647Y2 (en) | ||
| KR200215837Y1 (en) | A filter having characteristics of flat group delay in a wide band | |
| JPS60254801A (en) | Distributed constant type filter | |
| JPS6122327Y2 (en) | ||
| JPH05335806A (en) | Dielectric microwave filter |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20080105 Year of fee payment: 14 |
|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20090105 Year of fee payment: 15 |
|
| EXPY | Cancellation because of completion of term |