CN202616376U - Adjustable band-stop filter - Google Patents
Adjustable band-stop filter Download PDFInfo
- Publication number
- CN202616376U CN202616376U CN2012202864832U CN201220286483U CN202616376U CN 202616376 U CN202616376 U CN 202616376U CN 2012202864832 U CN2012202864832 U CN 2012202864832U CN 201220286483 U CN201220286483 U CN 201220286483U CN 202616376 U CN202616376 U CN 202616376U
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- Prior art keywords
- cover plate
- metal
- stop filter
- wire
- metal wire
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Abstract
The utility model discloses an adjustable band-stop filter which comprises a metal wire, a cover plate, at last two resonant cavities and frequency tuning screws. Frequency of the band-stop filter can be adjusted within the range of a wide band by means of the changing of depth of the frequency tuning screws inserted into the resonant cavities. Bandwidth of the band-stop filter can be adjusted within the range of a wide frequency by means of the changing of distance of the metal wire and a metal post or the metal wire and a metal disk. The adjustable band-stop filter has the advantages of being simple in processing, low in processing cost, and convenient to change the bandwidth, and frequency changing of the bandwidth is facilitated. The adjustable band-stop filter can be widely used in electronic systems of various microwave wave bands, and especially in military and civil fields such as radar, missile guidance, and communication.
Description
Technical field
The utility model relates to filter, specifically, relates to a kind of a kind of frequency of coaxial transmission line and resonant cavity coupling formation and tunable band-stop filter that bandwidth can be regulated of utilizing in very wide scope outside filter.
Background technology
On the sidewall of the microwave transmission line of a sealing, increase a coupled resonator, can on the transmission curve of transmission line, some frequency produce transmission zero, thereby the signal that stops these frequencies is through this transmission line.At present the most common to band stop filter comprise the transmission line of a coaxial configuration and some resonant cavitys of arranging along this transmission line axis.These resonant cavitys in transmission line one side for opening wide structure.Open wide structure through these and realize the coupling between transmission line and the resonant cavity.Be provided with metal column in the resonant cavity, the length of metal column can change outside filter, can regulate the resonance frequency resonant cavity of resonant cavity and the coupling between the transmission line simultaneously.But; Because the degree of depth that metal column inserts in the resonant cavity changes the resonance frequency resonant cavity of resonant cavity and the coupling between the transmission line simultaneously, make external screw thread and the cooperation degree of tightness between the internal thread on the screw on the resonant cavity on the metal column select to bring difficulty.Simultaneously, because related between the coupling of the frequency resonant cavity of resonant cavity and transmission line, just can not independent variation between the frequency of band stop filter and the bandwidth of rejection, cause the adjustable range of frequency and bandwidth of rejection of band stop filter very narrow.Change the above-mentioned parameter of filter a little, just require to design again and process band stop filter.This carries out design iterations and a large amount of small lot batch manufactures with needs, causes the cost of band stop filter high.
The utility model content
The purpose of the utility model is to provide a kind of and processes simply, can realize that the broadband is regulated, the tunable band-stop filter of compact conformation to frequency and bandwidth.
For achieving the above object, the technical scheme that the utility model adopts is:
A kind of tunable band-stop filter comprises the base that has at least 2 cylindricality resonant cavitys, and said base openings position is connected with cover plate; Said base set inside has the metal column that is connected in the base bottom, and metal column is positioned at intra; Said cover plate has wire casing near the one side of base direction, is provided with metal wire in the said wire casing, and has the gap between said metal wire and the cover plate; Said cover plate two ends are connected with metallic plate and coaxial fitting respectively in turn; Said coaxial fitting comprises outer medium and is arranged on the inner inner wire of outer medium; And the inner wire of coaxial fitting runs through metallic plate and is connected with cover plate and with metal wire, and cover plate is connected with the screw that runs through metallic plate.
The end face that said cover plate is connected with metallic plate is provided with N group fixing threaded hole, N >=2 wherein, and every group of fixing threaded hole is made up of M screw, wherein M >=2; The spacing at adjacent screw center is less than 1/3 times of spacing of two adjacent groups fixing threaded hole in any one group of fixing threaded hole; The end face that said cover plate is connected with metallic plate also is provided with rectangle adjustment through hole.
Said metallic plate is provided with N rectangular through-hole, wherein N >=2; Also be provided with the circular hole that is complementary with coaxial fitting on the said metallic plate, the inner wire of said coaxial fitting extends into cover plate inside through circular hole, rectangle adjustment through hole successively and is connected with metal wire.
Said metal column also is connected with metal dish away from an end of base bottom, and the parallel axes of the axis of metal dish and metal column, the metal dish cross section be shaped as rectangle, and the downward projection area of metal dish is greater than the downward projection area of metal column.
Said metal dish extends towards the base bottom bend near the edge of resonant cavity sidewall.
Said cover plate is provided with the frequency tuning screw; Said tuning screw runs through cover plate and extends into intra; And have the gap between frequency tuning screw and the metal column, and the axis of the axis of said frequency tuning screw and metal wire is the downward projection of vertical and frequency tuning screw and there is the gap in the downward projection of metal wire.
Cover plate is provided with the coupling tuning screw, and said coupling tuning screw runs through cover plate and extends into wire casing inside, and the coupling tuning screw be positioned at metal wire directly over, have the gap between coupling tuning screw and the metal wire.
Further; For with metal wire unsettled to be arranged on the inlet wire groove inner; The utility model also comprises at least two pairs of Supporting Medias, and every pair of Supporting Media comprises two Supporting Medias, and said two Supporting Medias lay respectively at the both sides up and down of metal wire; The upper surface of every Supporting Media is all parallel with the cover plate bottom surface with lower surface; And Supporting Media also is connected with and outside cover plate, stretches into the inner hold-down screw of cover plate, hold-down screw be positioned at every pair of Supporting Media directly over, the end that hold-down screw gets into cover plate is connected with Supporting Media.
Said resonant cavity and be positioned at the metal column of intra and the shape of cross section of metal wire and wire casing is rectangle.
The direction projection area of overlooking of metal column is overlooked the direction projection area greater than metal wire.
Based on foregoing, we can be regarded as metal wire and wire casing constitutes transmission line, and said metal column is positioned at the resonant cavity bottom and only is connected with the resonant cavity wall in the resonant cavity bottom, and its position and degree of depth in resonant cavity can not be regulated outside resonant cavity.Make us make the frequency of resonant cavity and design load very approaching through the milling processing of precision like this, the convenient tuning screw completion resonant cavity that adopts is tuning.
The metal column top is provided with the metal dish that only is connected with metal column, and this arrangement makes us can dwindle the volume of resonant cavity, increases the basic mode of resonant cavity and the difference between the higher mode resonance frequency simultaneously.The latter will help realizing the band stop filter of parasitic stopband far away.
Metal dish extends towards the base bottom bend near the end face of resonant cavity sidewall.This arrangement makes us can further dwindle the volume of resonant cavity, increases the basic mode of resonant cavity and the difference between the higher mode resonance frequency simultaneously.The latter will help realizing the band stop filter of farther parasitic stopband.
Be provided with the frequency tuning screw at cover plate, this frequency tuning screw stretches into the degree of depth of resonant cavity and can outside resonant cavity, regulate, and its position is not above metal wire.In the utility model since the metal column in the resonant cavity or be arranged at the metal column top metallic plate overlook the direction projection area greater than metal wire overlook the direction projection area, so the frequency tuning screw is to the tuning simple of resonant cavity frequency and effectively.
Be provided with the coupling tuning screw at cover plate, directly over the coupling tuning screw was positioned at metal wire, the coupling tuning screw ran through cover plate and extends into wire casing inside, but does not contact with metal wire.
The utility model can be divided into base and cover plate.After the metal dish needs that are connected with metal column are processed in addition, being welded on the metal column, other structure of all on all the other bases can once be accomplished through milling processing.
Metal wire is positioned at the inside wire casing of cover plate; Can effectively reduce the volume of whole filter; Favourable realization the miniaturization Design of filter; At band stop filter the back is installed for ease simultaneously and changes the distance between metal wire and metal column or the metal dish, we are provided with at least one pair of Supporting Media.Every pair of Supporting Media is placed in same position on the transmission line inner wire axis, is positioned at the above and below of transmission line inner wire.Every Supporting Media and transmission line inner wire top and following be the part on the plane parallel with the transmission line bottom surface.
In order to make the position of metal wire in cover plate fixing according to the complete back of bandwidth parameter needs adjustment of filter, we also are provided with hold-down screw.Above our Supporting Media on metal wire hold-down screw is set.We regulate the degree of depth of hold-down screw entering transmission line and can outside transmission line, through Supporting Media the position of transmission line inner wire transmission line be pinned.
Said cover plate two ends link to each other with coaxial fitting respectively.Distance between metal wire and metal column or the metal dish can be through changing the position change of coaxial fitting and metallic plate outside transmission line simultaneously.
The utility model has solved the problem of transmission line inner wire adjustment, and generally speaking, existing metal wire all adopts fixed mode, and is not removable.Therefore be not easy to regulate the operation of filtering.
Therefore; We are employed in cover plate and are outside equipped with the hold-down screw that is connected with Supporting Media; Unclamp Supporting Media through unscrewing hold-down screw, can change the position of coaxial fitting and metallic plate easily, thereby make the transmission line inner wire that contacts with Supporting Media directed mobile; With this change metal wire and metal column or between distance, therefore doing coupling and regulating.Because metal wire also passes the two ends of cover plate, in order to satisfy above-mentioned adjusting, so cover plate two ends through hole is set to rectangle adjustment through hole, and the coaxial fitting that metal wire connects can be adjusted through hole at rectangle and do and directedly move and drive metal wire and move.On this basis, metal wire does not have fixed structure, so we are designed with a metallic plate that is complementary therewith at this; Metallic plate be provided with through hole; Be used for fixing coaxial fitting, its metallic plate also is provided with rectangular through-hole, is used to adjust the relative link position of metallic plate and cover plate.
In conjunction with foregoing; The utility model has been realized two big purposes; The one, for filter is carried out miniaturization Design, the utility model changes conventional design, and the metal wire that will be used for transmission signals is arranged on the wire casing inside that cover plate is offered; Compare so in the past metal wire is arranged under, whole filter construction volume significantly reduces.The 2nd, for according to the actual requirements; Can realize the signal processing of different-waveband for a filter; For realizing the purpose of multi-use, the utility model spy is connected with metallic plate and coaxial fitting respectively in turn at the cover plate two ends, and the two ends of cover plate and metallic plate have the various holes that match each other; Can supply to regulate the metal wire up-down adjustment, realize the purpose of multi-use with this.Simultaneously; We can find out, from above-mentioned two problems can draw between the two with, when metal wire being arranged on wire casing that cover plate offers when inner; When the cover plate two ends were connected with metallic plate and coaxial fitting respectively in turn simultaneously, the volume of whole filter was only minimum design.It is inner to suppose that we are arranged on the wire casing that cover plate offers with metal wire, but is used to regulate the sidewall that through hole that metal wire moves up and down is arranged on base, and such structure wants to realize to have only metal wire is bent, and is also extremely inconvenient when regulating simultaneously.Therefore we can find out, have only when metal wire being arranged on wire casing that cover plate offers when inner, and when the cover plate two ends were connected with metallic plate and coaxial fitting respectively in turn simultaneously, the volume of whole filter was only the design of minimum.Other designs all can not achieve the above object.
The operation principle of band stop filter can be narrated as follows:
At first, electromagnetic wave signal is input to the transmission line and along transmission line from an end of transmission line.When signal ran into resonant cavity, this signal was distributed for the first time.Wherein a part continues transmission along transmission line, and another part gets in the resonant cavity and is reflected, and is distributed for the second time.Respectively along transmission line and reflection.
In certain frequency, from resonant cavity, reflect along the signal of transmission line and the signal phase that distributes the back along transmission line for the first time and differ 180 when spending, two parts of signals will be cancelled out each other, and make that to continue the resultant signal amplitude of transmission along transmission line very low.At this moment, most of signal of this frequency returns along transmission line and can not be along transmission line.A resonant cavity has like this played the effect that stops some frequency signal to pass through.Several resonant cavitys of arranging along transmission line make the signal that is in the stop-band frequency still less pass through, and let simultaneously be in more the passing through of signal in the passband more.
In a word, employing can further reduce wire casing and metal wire design the volume of band stop filter in cover plate inside; And wire casing on the cover board can once be accomplished through milling processing, and metal wire can be processed in addition and fix with Supporting Media, arranges like this to make the processing of filter simple, can cut down finished cost effectively; Simultaneously can also increase the basic mode of resonant cavity and the difference between the higher mode resonance frequency, this will help realizing the band stop filter of parasitic stopband far away.
The advantage of the utility model is to process simply, frequency and bandwidth can be regulated outside filter in very wide scope, simple in structure.The band stop filter of the utility model is expected to be widely used in the electronic system of each microwave band, particularly military affairs and civil areas such as radar, missile guidance, communication.
Description of drawings
Fig. 1 looks sketch map for the master of the utility model embodiment one.
Fig. 2 is the schematic side view of the utility model embodiment one.
Fig. 3 is the schematic top plan view of the utility model embodiment one.
Fig. 4 is a screw sketch map on the cover plate end face of the utility model embodiment one.
Fig. 5 is a through hole sketch map on the metallic plate of the utility model embodiment one.
Fig. 6 is the structural representation of the utility model embodiment two.
Fig. 7 is the structural representation of the utility model embodiment three.
Label among the figure is expressed as respectively: 1, resonant cavity; 2, wire casing; 3, metal wire; 4, metal column; 5, metal dish; 6, frequency tuning screw; 7, coupling tuning screw; 8, cover plate; 9, Supporting Media; 10, coaxial fitting; 11, metallic plate; 12, screw; 13, fixing threaded hole; 14, rectangular through-hole; 15, rectangle adjustment through hole; 16, hold-down screw.
Embodiment
Below in conjunction with embodiment the utility model is done to specify further, but the execution mode of the utility model is not limited thereto.
Embodiment one
Like Fig. 1,2,3,4, shown in 5, a kind of tunable band-stop filter comprises the base that has at least 2 resonant cavitys 1, and the base openings position is connected with cover plate 8; The base set inside has the metal column 4 that is connected in the base bottom, and metal column 4 is positioned at resonant cavity 1; Cover plate 8 has wire casing 2 near the one side of base direction, is provided with a wires 3 in the wire casing 2, and metal wire 3 constitutes transmission line with wire casing 2; There is the gap between metal wire 3 and the cover plate 8; And also comprise at least two pairs of Supporting Medias 9 in the wire casing, every pair of Supporting Media 9 comprises two Supporting Medias 9, and said two Supporting Medias 9 lay respectively at the both sides up and down of metal wire 3; The upper surface of every Supporting Media 9 is all parallel with cover plate 8 bottom surfaces with lower surface; And also comprise and outside cover plate 8, stretch into the inner hold-down screw 16 of cover plate 8, be positioned at every pair of Supporting Media 9 directly over, the end that hold-down screw 16 gets into cover plates 8 is connected with Supporting Media 9; Be respectively arranged with N group fixing threaded hole 13 on said cover plate 8 both ends of the surface, N >=2 wherein, every group of fixing threaded hole 13 is made up of M screw, wherein M >=2; The spacing at adjacent screw center is less than 1/3 times of spacing of two adjacent groups fixing threaded hole 13 in any one group of fixing threaded hole 13; All also be provided with rectangle adjustment through hole 15 on said cover plate 8 both ends of the surface; Said metallic plate 11 is provided with N rectangular through-hole 14, wherein N >=2; Also be provided with the circular hole that is complementary with coaxial fitting 10 on the said metallic plate 11, the inner wire of said coaxial fitting 10 extends into through circular hole and through rectangle adjustment through hole 15 that cover plate 8 is inner to be connected with metal wire 3.Cover plate 8 is connected with metallic plate 11 through screw 12.
Be provided with frequency tuning screw 6 at cover plate 8, this frequency tuning screw 6 stretches into the degree of depth of resonant cavity 1 and can outside cover plate 8, regulate, and its position is not above metal wire 3 and as far as possible away from metal wire 3.
All resonant cavitys, the shape of cross section that is positioned at resonant cavity 1 inner metal column 4, metal wire 3 and wire casing 2 all are set to rectangle.
Embodiment two
As shown in Figure 6; Present embodiment and embodiment one unique different place are that metal column 4 tops in resonant cavity 1 are provided with a metal dish 5, and metal dish 5 the projected area of overlooking direction with the direction of metal wire 3 axis normal on overlook the projected area of direction greater than metal wire 3.
Embodiment three
As shown in Figure 7, present embodiment with embodiment two unique different places is: the axis normal of the axis of metal dish 5 and metal column 4, and metal dish 5 extends towards the base bottom bend near the end face of resonant cavity 1 sidewall.
We have provided the embodiment of three tunable band-stop filters here.The implementation of the utility model is hard-core.Such as, according to the requirement that stopband suppresses, the number that constitutes the resonant cavity 1 of filter can be arranged to 3～20.This filter also can be used as part and is used to constitute other filtering device and microwave components.
Just can realize the utility model preferably as stated.
Claims (10)
1. tunable band-stop filter, it is characterized in that: comprise the base that has at least 2 cylindricality resonant cavitys (1), said base openings position is connected with cover plate (8); Said base set inside has the metal column (4) that is connected in the base bottom, and metal column (4) is positioned at resonant cavity (1) inside; Said cover plate (8) has wire casing (2) near the one side of base direction, is provided with metal wire (3) in the said wire casing (2), and has the gap between said metal wire (3) and the cover plate (8); Said cover plate (8) two ends are connected with metallic plate (11) and coaxial fitting (10) respectively in turn; Said coaxial fitting (10) comprises outer medium and is arranged on the inner inner wire of outer medium; And the inner wire of coaxial fitting (10) runs through metallic plate (11) and is connected with cover plate (8) and with metal wire (3), and cover plate (8) is connected with the screw (12) that runs through metallic plate (11).
2. a kind of tunable band-stop filter according to claim 1; It is characterized in that: the end face that said cover plate (8) is connected with metallic plate (11) is provided with N group fixing threaded hole (13); N >=2 wherein, every group of fixing threaded hole (13) is made up of M screw, wherein M >=2; The spacing at adjacent screw center is less than 1/3 times of spacing of two adjacent groups fixing threaded hole (13) in any one group of fixing threaded hole (13); The end face that said cover plate (8) is connected with metallic plate (11) also is provided with rectangle adjustment through hole (15).
3. a kind of tunable band-stop filter according to claim 2 is characterized in that: said metallic plate (11) is provided with N rectangular through-hole (14), wherein N >=2; Also be provided with the circular hole that is complementary with coaxial fitting (10) on the said metallic plate (11), the inner wire of said coaxial fitting (10) extends into cover plate (8) inside through circular hole, rectangle adjustment through hole (15) successively and is connected with metal wire (3).
4. a kind of tunable band-stop filter according to claim 1; It is characterized in that: said metal column (4) also is connected with metal dish (5) away from an end of base bottom; And the parallel axes of the axis of metal dish (5) and metal column (4); Metal dish (5) cross section be shaped as rectangle, and the downward projection area of metal dish (5) is greater than the downward projection area of metal column (4).
5. a kind of tunable band-stop filter according to claim 4 is characterized in that: said metal dish (5) extends towards the base bottom bend near the edge of resonant cavity (1) sidewall.
6. a kind of tunable band-stop filter according to claim 1; It is characterized in that: said cover plate (8) is provided with frequency tuning screw (6); Said tuning screw (6) runs through cover plate (8) and extends into resonant cavity (1) inside; And have the gap between frequency tuning screw (6) and the metal column (4), and the axis of the axis of said frequency tuning screw (6) and metal wire (3) is the downward projection of vertical and frequency tuning screw (6) and there is the gap in the downward projection of metal wire (3).
7. a kind of tunable band-stop filter according to claim 1; It is characterized in that: cover plate (8) is provided with coupling tuning screw (7); Said coupling tuning screw (7) runs through cover plate (8) and extends into wire casing (2) inside; And coupling tuning screw (7) be positioned at metal wire (3) directly over, have the gap between coupling tuning screw (7) and the metal wire (3).
8. according to any described a kind of tunable band-stop filter among the claim 1-7; It is characterized in that: also comprise at least two pairs of Supporting Medias (9); Every pair of Supporting Media (9) comprises two Supporting Medias (9); Said two Supporting Medias (9) lay respectively at the both sides up and down of metal wire (3); The upper surface of every Supporting Media (9) is all parallel with cover plate (8) bottom surface with lower surface; And Supporting Media (9) also is connected with and outside cover plate (8), stretches into the inner hold-down screw (16) of cover plate (8), hold-down screw (16) be positioned at every pair of Supporting Media (9) directly over, the end that hold-down screw (16) gets into cover plate (8) is connected with Supporting Media (9).
9. according to any described a kind of compact band stop filter among the claim 1-7, it is characterized in that: said resonant cavity (1) and be positioned at the inner metal column (4) of resonant cavity (1) and the shape of cross section of metal wire (3) and wire casing (2) is rectangle.
10. according to any described a kind of tunable band-stop filter among the claim 1-7, it is characterized in that: the direction projection area of overlooking of said metal column (4) is overlooked the direction projection area greater than metal wire (3).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012202864832U CN202616376U (en) | 2012-06-19 | 2012-06-19 | Adjustable band-stop filter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012202864832U CN202616376U (en) | 2012-06-19 | 2012-06-19 | Adjustable band-stop filter |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202616376U true CN202616376U (en) | 2012-12-19 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2012202864832U Expired - Fee Related CN202616376U (en) | 2012-06-19 | 2012-06-19 | Adjustable band-stop filter |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202616376U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102709626A (en) * | 2012-06-19 | 2012-10-03 | 成都赛纳赛德科技有限公司 | Adjustable band-stop filter |
| CN112886161A (en) * | 2015-11-27 | 2021-06-01 | 华为技术有限公司 | Dielectric filter, transceiver and base station |
-
2012
- 2012-06-19 CN CN2012202864832U patent/CN202616376U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102709626A (en) * | 2012-06-19 | 2012-10-03 | 成都赛纳赛德科技有限公司 | Adjustable band-stop filter |
| CN112886161A (en) * | 2015-11-27 | 2021-06-01 | 华为技术有限公司 | Dielectric filter, transceiver and base station |
| CN112886161B (en) * | 2015-11-27 | 2022-03-29 | 华为技术有限公司 | Dielectric filter, transceiver and base station |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20121219 Termination date: 20150619 |
|
| EXPY | Termination of patent right or utility model |