CN101604779A - Narrowband FSS filter - Google Patents
Narrowband FSS filter Download PDFInfo
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- CN101604779A CN101604779A CNA2009100592501A CN200910059250A CN101604779A CN 101604779 A CN101604779 A CN 101604779A CN A2009100592501 A CNA2009100592501 A CN A2009100592501A CN 200910059250 A CN200910059250 A CN 200910059250A CN 101604779 A CN101604779 A CN 101604779A
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- metallic membrane
- waveguide
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- narrowband
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Abstract
The invention discloses a kind of narrowband FSS filter, comprise waveguide, resonance metallic membrane and coupling metallic membrane.Resonance metallic membrane and coupling metallic membrane be vertical vertical with waveguide all, and the while is connected with four faces up and down of waveguide, it is characterized in that, described resonance metallic membrane vertically is arranged alternately along filter with the metallic membrane that is coupled.Be provided with the coupling aperture that is connected with the waveguide inwall on the direction only on two kinds of metallic membranes in waveguide cross-section.The present invention can satisfy in the scope of bandwidth relative narrower that Insertion Loss in the passband is low, suppress the designing requirement of height and compact appearance outside the passband, have flexible design, characteristics simple in structure, easy to process, be mainly used in the electronic system of various microwave bands, particularly military field and civil areas such as radar, antenna-feedback system, missile guidance, communication.
Description
Technical field
The present invention relates to a kind of waveguide filter, specifically, relate to a kind of narrowband FSS filter.
Background technology
2006, people such as Rosa-Maria Barrio-Garrido reported a kind of compact waveguide filter [IEEE MTT-S International Microwave SymposiumDigest, June 2006, pp 250-253].This filter is formed by several metal resonant iris serial connections.The transmission response of filter is controlled by the position and the size of the coupling aperture on the metallic membrane on the resonant cavity cross section.Because this metallic membrane resonant cavity is more intense with the coupling between the waveguide that is connected, this structure only is suitable for broadband filter, is difficult to make relative bandwidth and is lower than 10% narrow band filter.
Summary of the invention
The purpose of this invention is to provide a kind of narrowband FSS filter, increase the outer inhibition of band, improve performance, simplify the course of processing, reduce difficulty of processing, cut down finished cost.
To achieve these goals, the technical solution used in the present invention is:
Narrowband FSS filter comprises waveguide, resonance metallic membrane and coupling metallic membrane, it is characterized in that, described resonance metallic membrane and coupling metallic membrane vertically are arranged alternately along waveguide, wherein, the coupling metallic membrane is provided with narrow coupling aperture, and the resonance metallic membrane is provided with wide coupling aperture.
The width of described narrow coupling aperture is less than its 0.1mm highly at least.
The width of described wide coupling aperture is greater than its 0.1nm highly at least.
Connection waveguide between described adjacent coupled metallic membrane and the resonance metallic membrane in length longitudinally at least than 1/3rd also little 0.1mm of duct width.
Described narrow coupling aperture is a rectangle.
Described wide coupling aperture is a rectangle.
The two sides, the left and right sides of described wide coupling aperture may extend into waveguide left and right sides sidewall, makes the width of wide coupling aperture equal the waveguide cross-section width.
The bottom surface of described narrow coupling aperture may extend to the waveguide lower wall, makes this coupling aperture height equal waveguide inner chamber height.
The difference of the present invention and prior art maximum is that the resonance metal film in the waveguide cavity is arranged alternately with the coupling metallic membrane.The resonance metallic membrane is " recessed " type diaphragm, and the wide coupling aperture on it is only above that along linking to each other with the broadside inwall of waveguide.At this moment, the lower edge of wide coupling aperture and the distance of guide floor are a transformable parameter, and this makes that with regard to for the design of whole filter has increased a parameter design is more flexible.Simultaneously, in waveguide, between each resonance sheet metal the coupling metallic membrane is set.Be equipped with narrow coupling aperture above the coupling metallic membrane.The upper edge of all wide coupling apertures and narrow coupling aperture links to each other with the broadside inwall of waveguide.The height of narrow coupling aperture is greater than its width.For guaranteeing performance of the present invention, be connected waveguide in that length should be less than 1/2nd of duct width longitudinally between resonance metallic membrane and the coupling metallic membrane.
The present invention has following characteristics:
One. resonant cavity can reduce by the width that dwindles narrow coupling aperture with the degree of coupling in the external world among the present invention, thereby constitutes narrow band filter, obtains good narrow-band filtering characteristic, and the common direct-coupled cavity filter of the outer rejection ratio of band is better.
Two. compare with common direct-coupled cavity filter, the present invention is obtaining under the high performance prerequisite owing to adopted the FSS diaphragm, and overall dimensions are compact more, help the miniaturization Design of microwave circuit system.
Three. compare with common direct-coupled cavity filter, under the very narrow situation of relative bandwidth, require the width of the narrow coupling aperture on the coupling metallic membrane in the filter very little.This filter adds man-hour by milling, requires to adopt very thin milling cutter.The present invention has reduced the height of coupling aperture, does not need to be machined to the rectangular waveguide bottom during processing coupling aperture, can reduce the mismachining tolerance that the milling cutter bending brings, and guarantees machining accuracy better.
Four. increased the number of design parameter, made design more flexible.
Five. adopt technical scheme of the present invention, not only can realize wideband filtered, can also realize narrow-band filtering, when realizing narrow-band filtering, its passband relative bandwidth can reach below 5%.
The present invention can be widely used in the electronic system of each microwave band, particularly military affairs and civil areas such as radar, antenna-feedback system, missile guidance, communication.
Description of drawings
Fig. 1 is the structural representation of the present invention-embodiment one.
Fig. 2 is that the A-A of Fig. 1 is to structural representation.
Fig. 3 is the structural representation of resonance sheet metal among Fig. 1.
Fig. 4 is the structural representation of coupling sheet metal among Fig. 1.
The corresponding title of label in the accompanying drawing: 1-rectangular waveguide, 2-resonance metallic membrane, the 3-metallic membrane that is coupled, the narrow coupling aperture of 4-, the wide coupling aperture of 5-.
Embodiment
Embodiment one
As depicted in figs. 1 and 2, narrowband FSS filter, comprise waveguide 1, resonance metallic membrane 2 and coupling metallic membrane 3, wherein, resonance metallic membrane 2 and coupling metallic membrane 3 are arranged alternately in waveguide 1 chamber, and link to each other with the inwall of four faces up and down of waveguide 1, the connection waveguide between resonance metallic membrane 2 and the coupling metallic membrane 3 in length longitudinally less than 1/3rd of duct width.Resonance metallic membrane 2 is provided with the wide coupling aperture 5 that only is connected with the waveguide inwall on a direction of waveguide 1 cross section as described in Figure 5, makes resonance metallic membrane 2 form the metallic membrane of a spill, and the width of wide coupling aperture is greater than its height; The metallic membrane 3 that is coupled as described in Figure 6 is provided with the narrow coupling aperture 4 that only is connected with the waveguide inwall on a direction of waveguide 1 cross section, make coupling metallic membrane 3 also form a concave metal diaphragm, and the width of this narrow coupling aperture is less than its height.
Among the present invention, the narrow coupling aperture 4 on resonance metallic membrane 2 and the coupling metallic membrane 3 and the size of wide coupling aperture 5 can change according to actual needs.By the foregoing description, as can be seen, the present invention can satisfy in the scope of bandwidth relative narrower that Insertion Loss in the passband is low, suppress the designing requirement of height and compact appearance outside the passband.The present invention has flexible design, characteristics simple in structure, easy to process, is mainly used in the electronic system of various microwave bands, particularly military field and civil areas such as radar, antenna-feedback system, missile guidance, communication.
Claims (6)
1, narrowband FSS filter, comprise waveguide (1), resonance metallic membrane (2) and coupling metallic membrane (3), it is characterized in that, described resonance metallic membrane (2) and coupling metallic membrane (3) vertically are arranged alternately along waveguide (1), wherein, resonance metallic membrane (2) is provided with wide coupling aperture (5), and coupling metallic membrane (3) is provided with narrow coupling aperture (4).
2, narrowband FSS filter according to claim 1 is characterized in that, the width of described narrow coupling aperture (4) is less than its 0.1mm highly at least.
3, narrowband FSS filter according to claim 1 is characterized in that, the width of described wide coupling aperture (5) is greater than its 0.1mm highly at least.
4, according to claims 1 or 2 or 3 described narrowband FSS filters, it is characterized in that, described adjacent coupling metallic membrane (3) and the connection waveguide between the resonance metallic membrane (2) in length longitudinally at least than 1/2nd also little 0.1mm of duct width.
5. according to claims 1 described narrowband FSS filter, it is characterized in that described narrow coupling aperture (4) is a rectangle.
6. according to claims 1 described narrowband FSS filter, it is characterized in that described wide coupling aperture (5) is a rectangle.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2009100592501A CN101604779A (en) | 2009-05-12 | 2009-05-12 | Narrowband FSS filter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2009100592501A CN101604779A (en) | 2009-05-12 | 2009-05-12 | Narrowband FSS filter |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN101604779A true CN101604779A (en) | 2009-12-16 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNA2009100592501A Pending CN101604779A (en) | 2009-05-12 | 2009-05-12 | Narrowband FSS filter |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110336101A (en) * | 2019-06-28 | 2019-10-15 | 电子科技大学 | A kind of Wide stop bands inductance diaphragm, capacitive window interlock loading waveguide bandpass filter |
-
2009
- 2009-05-12 CN CNA2009100592501A patent/CN101604779A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110336101A (en) * | 2019-06-28 | 2019-10-15 | 电子科技大学 | A kind of Wide stop bands inductance diaphragm, capacitive window interlock loading waveguide bandpass filter |
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Application publication date: 20091216 |