CN101719578B - Folding filter - Google Patents
Folding filter Download PDFInfo
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- CN101719578B CN101719578B CN 200910215404 CN200910215404A CN101719578B CN 101719578 B CN101719578 B CN 101719578B CN 200910215404 CN200910215404 CN 200910215404 CN 200910215404 A CN200910215404 A CN 200910215404A CN 101719578 B CN101719578 B CN 101719578B
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- filter
- rectangular
- folding filter
- rectangular resonant
- resonant cavities
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Abstract
The invention discloses a folding filter belonging to the technical field of microwave communication and mainly solving the problem that the miniaturization of a filter is conflicted with the enhancement of the external inhibition capacity of the filter in the prior art. The folding filter comprises input structures, output structures and rectangular resonant cavities, wherein the input structures and the output structures are respectively arranged on both ends of the rectangular resonant cavities. The folding filter is characterized by comprising at least three rectangular resonant cavities, the central points of the adjacent three rectangular resonant cavities are connected into a V shape, and two rectangular resonant cavities positioned at the same side respectively have coincided angles with the other rectangular resonant cavity. The invention has small length, few assembly processes and good high-end inhibition, can be widely used for electric systems, such as a satellite television receiving system, a satellite communication system, a radar, and the like.
Description
Technical field
The present invention relates to a kind of filter, specifically, the line that relates between the center of adjacent resonators is the folding filter of broken line.
Background technology
The miniaturization of filter is the classical research topic in microwave electromagnetic field field.Common direct-coupled cavity filter utilizes the inductance diaphragm that rectangular cavity is coupled together, and has advantages such as Insertion Loss is low, power capacity big, handling ease.But this filter also has following weakness:
The first, the length of filter is the length of each rectangular cavity and the thickness sum of each inductance diaphragm, so the length of filter is difficult to shorten;
The second because the influence of adopting the inductance diaphragm and receiving its parasitic passband, the outer inhibition ability of its band outside passband is high-end than low side heterodyne;
The 3rd, when this filter is divided into base and upper cover plate adds man-hour, need near the upper shed of inductance diaphragm, set up hold-down screw; To guarantee the excellent electric contact on cover plate bottom and inductance diaphragm top, in this case, will have to increase the thickness of inductance diaphragm; Cause the length of filter to increase; Perhaps filter mounts and upper cover plate are welded, cause filter to increase manufacturing procedures such as silver-plated, gold-plated, make the manufacturing cost of filter improve greatly.
Summary of the invention
The object of the present invention is to provide a kind of, passband high-end outer suppress better and manufacturing cost lower folding filter shorter than existing direct-coupled cavity filter.
To achieve these goals, the technical scheme of the present invention's employing is following:
Folding filter; Comprise input structure, export structure and rectangular cavity; Input structure and export structure are arranged at the two ends of rectangular cavity respectively; Tool is characterised in that said folding filter comprises three rectangular cavities at least, three adjacent rectangular cavity central points be wired to " V " font; And two rectangular cavities that are positioned at the same side have an angle that overlaps with the another one rectangular cavity respectively, and the angle of this coincidence has just constituted the coupling channel between two rectangular cavities.
The angle that has a coincidence between said input structure and the rectangular cavity that is adjacent also has the angle of a coincidence between export structure and the rectangular cavity that is adjacent.
Two adjacent but do not have between the rectangular cavity of coincident configurations and be provided with cross coupling structure.
Also be provided with the metal boss in the said rectangular cavity, the metal boss has only the bottom to be connected with rectangular cavity, with length or the width that further dwindles filter.
Can know that from the theory of filter band pass filter is to be formed through certain coupled structure serial connection by some resonant cavitys.In the direct-coupled cavity filter; Resonant cavity is a rectangular enclosure, and coupled structure is the middle inductance diaphragm that cracks, and all resonant cavitys and inductance diaphragm are connected in series along the filter longitudinal axis successively; So the length of filter adds the thickness of each inductance diaphragm for the length of each rectangular cavity.The present invention is through placing adjacent rectangular cavity at lateral alternate; And make the angle of the coincidence that the adjacent rectangle resonant cavity has; Utilize the coupling between the superposed part control adjacent rectangle resonant cavity, be used to realize the inductance diaphragm that is coupled in the prior art thereby removed; Simultaneously and since the adjacent rectangle resonant cavity filter laterally have a lap, the length of whole filter deducts the lap of adjacent rectangle resonant cavity for the length sum of each rectangular cavity
In the axial length sum of filter, compared with prior art, folding filter of the present invention has littler length.
In sum, the present invention mainly has following advantage:
The one, overlaps through an angle that makes two adjacent rectangular cavities and realizes coupling, removes the inductance diaphragm in the existing direct-coupled cavity filter simultaneously, and the length of filter is shortened greatly.
The 2nd, is not owing to there is an inductance diaphragm, and when filter was installed with upper cover plate processing back as the bottom, electrically contacting between the two needn't only need just can be guaranteed through attachment screw through welding.When lower cost materials such as employing alloy aluminum, the superiority of this structure is more obvious, because the welding of these materials mostly need be carried out silver-plated or gold-plated processing to workpiece.
The 3rd. this structure can realize transmission zero outside the passband of filter is high-end, the high-end inhibition ability of filter is improved greatly.
The 4th. this structure realizes cross-couplings adjacent but that do not have between the rectangular cavity of coincident configurations more easily.Electric capacity, inductance or other resonance cross-couplings can realize transmission zero outside the passband low side of this filter, high-end or two ends, also can be used to improve the phase linearity in the passband of filter.
The present invention designs ingenious, and is simple in structure, easy to process, has very high value, can be widely used in the electronic systems such as satellite television reception, satellite communication, radar.
Description of drawings
Fig. 1 is the vertical view of the present invention-embodiment.
Embodiment
Embodiment
As shown in Figure 1, folding filter comprises input waveguide 1, output waveguide 2 and seven rectangular cavities 3.The line of the central point of three the adjacent rectangular cavities 3 of going constitutes angle " V " font less than 50 degree.In three rectangular cavities that each composition " V " font is provided with; Two rectangular cavities 3 in the same side have an angle that overlaps respectively with between another rectangular cavity; The angle of this coincidence has constituted the coupling channel between two rectangular cavities, and the rectangular cavity 3 of all coupling channels through the relevant position just constituted the main coupling channel of whole filter after being communicated with.In second rectangular cavity 3, be provided with the metal boss 5 of a rectangle.5 of this metal boss are connected with rectangular cavity 3 in the bottom.Any two adjacent but do not have between the rectangular cavity of coincident configurations and be provided with cross coupling structure 4, cross coupling structure 4 is a rectangular opening.
The simplest instance of the present invention is based on the filter cell of three rectangular cavities.This filter cell comprises input structure, export structure, and has the coupling channel between two rectangular cavities of coincident configurations and do not have the cross coupling structure between two rectangular cavities of coincident configurations.This filter cell can constitute filter separately, also can connect and compose filter with other resonant cavity.The another kind of purposes of this unit is to be used to constitute duplexer or multiplexer.
Though resonant cavity is shaped as rectangle in the foregoing description,, other resonant cavity of the similar rectangle of shape of cross section comprises that the rectangular cylinder of elliptic cylindrical and corner cut, chamfering can be used for constituting filter of the present invention.
Claims (5)
1. folding filter; Comprise input structure (1), export structure (2) and rectangular cavity (3); Input structure (1) and export structure (2) are arranged at the two ends of rectangular cavity (3) respectively, it is characterized in that, said folding filter comprises three rectangular cavities (3) at least; Adjacent three rectangular cavities (3) central point be wired to " V " font, and two rectangular cavities (3) that are positioned at horizontal the same side have an angle that overlaps with another one rectangular cavity (3) respectively.
2. folding filter according to claim 1 is characterized in that, has the angle of a coincidence between said input structure (1) and the rectangular cavity (3) that is adjacent.
3. folding filter according to claim 1 is characterized in that, has the angle of a coincidence between said export structure (2) and the rectangular cavity (3) that is adjacent.
4. folding filter according to claim 1 is characterized in that, two adjacent but do not have between the rectangular cavity (3) of overlapped part and be provided with cross coupling structure (4).
5. folding filter according to claim 1 is characterized in that, is provided with metal boss (5) in the said rectangular cavity (3), and said metal boss (5) has only the bottom to be connected with rectangular cavity.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200910215404 CN101719578B (en) | 2009-12-25 | 2009-12-25 | Folding filter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200910215404 CN101719578B (en) | 2009-12-25 | 2009-12-25 | Folding filter |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101719578A CN101719578A (en) | 2010-06-02 |
| CN101719578B true CN101719578B (en) | 2012-09-05 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200910215404 Expired - Fee Related CN101719578B (en) | 2009-12-25 | 2009-12-25 | Folding filter |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN101719578B (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20210027060A (en) * | 2019-08-30 | 2021-03-10 | 주식회사 케이엠더블유 | Waveguide filter |
| CN110676547A (en) * | 2019-10-12 | 2020-01-10 | 南京理工大学 | Ku wave band interdigital cavity filter |
| CN114927844B (en) * | 2022-07-20 | 2022-11-15 | 南京天朗防务科技有限公司 | Waveguide filter of Ku wave band |
| CN118659103A (en) * | 2024-08-22 | 2024-09-17 | 合肥锋浩电子科技有限公司 | Millimeter wave broadband band-pass filter |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4578655A (en) * | 1983-01-19 | 1986-03-25 | Thomson-Csf | Tuneable ultra-high frequency filter with mode TM010 dielectric resonators |
| CN2881986Y (en) * | 2006-03-29 | 2007-03-21 | 摩比天线技术（深圳）有限公司 | Combined cross coupling device |
| CN201311960Y (en) * | 2008-11-17 | 2009-09-16 | 成都赛纳赛德科技有限公司 | Rectangular dual-mode filter |
| CN201655940U (en) * | 2009-12-25 | 2010-11-24 | 成都赛纳赛德科技有限公司 | Folded filter |
-
2009
- 2009-12-25 CN CN 200910215404 patent/CN101719578B/en not_active Expired - Fee Related
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4578655A (en) * | 1983-01-19 | 1986-03-25 | Thomson-Csf | Tuneable ultra-high frequency filter with mode TM010 dielectric resonators |
| CN2881986Y (en) * | 2006-03-29 | 2007-03-21 | 摩比天线技术（深圳）有限公司 | Combined cross coupling device |
| CN201311960Y (en) * | 2008-11-17 | 2009-09-16 | 成都赛纳赛德科技有限公司 | Rectangular dual-mode filter |
| CN201655940U (en) * | 2009-12-25 | 2010-11-24 | 成都赛纳赛德科技有限公司 | Folded filter |
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| Publication number | Publication date |
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| CN101719578A (en) | 2010-06-02 |
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Granted publication date: 20120905 Termination date: 20171225 |