CN202259612U - Band elimination filter - Google Patents
Band elimination filter Download PDFInfo
- Publication number
- CN202259612U CN202259612U CN 201120399285 CN201120399285U CN202259612U CN 202259612 U CN202259612 U CN 202259612U CN 201120399285 CN201120399285 CN 201120399285 CN 201120399285 U CN201120399285 U CN 201120399285U CN 202259612 U CN202259612 U CN 202259612U
- Authority
- CN
- China
- Prior art keywords
- resonant cavity
- inner wire
- cylindrical metal
- tuning screw
- stop 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.)
- Withdrawn - After Issue
Links
Images
Landscapes
- Control Of Motors That Do Not Use Commutators (AREA)
Abstract
The utility model discloses a band elimination filter which comprises a base provided with four resonant cavities. The opening position of the base is connected with a cover plate. The band elimination filter has the characteristics of simple processing, low processing cost and convenient debugging and can be broadly applied to electronic systems with each microwave band, in particular to military and civil fields such as radar, missile guidance and communications and the like.
Description
Technical field
The utility model relates to filter, specifically, relates to a kind of a kind of band stop filter that utilizes coaxial transmission line and resonant cavity coupling to constitute.
Background technology
On the microwave transmission line sidewall of a sealing, increase a coupled resonator, can on the transmission curve of transmission line, some frequency produce transmission zero, thereby stop the signal of these frequencies to pass through this transmission line.Present modal band stop filter comprises the transmission line of a coaxial configuration and some resonant cavitys of arranging along this transmission line axis.These resonant cavitys, are opened wide structure through these and are realized the coupling between transmission line and the resonant cavity for opening wide structure in transmission line one side.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,, make external screw thread and the cooperation degree of tightness between the internal thread of the screw on the resonant cavity on the metal column select to bring difficulty 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.If too loose, after screw structural locking, the screw axis direction is uncertain in resonant cavity, can make the filter fine setting become difficult.If too tightly will make metal column rotate difficulty, also can make the debugging of filter become difficult.In addition, in order to obtain the stopband response of symmetry, the electrical length that needs transmission line between the resonant cavity in theory is 1/4 of a center frequency place wavelength.When stop-band frequency is higher, require the length of transmission line very short, this will cause the close between each resonant cavity.Guaranteeing that band stop filter inserts under the enough little situation of loss, the volume of resonant cavity can not be too little, like this between chamber and the chamber even the phenomenon of juxtaposition possibly occur.
The utility model content
The purpose of the utility model is to provide a kind of and processes simply, debugging is convenient, the band stop filter of compact conformation.
For achieving the above object, the technical scheme that the utility model adopts is: a kind of band stop filter is characterized in that: comprise the base that is provided with some resonant cavitys, said base openings position is connected with cover plate; Said resonant cavity is the column rectangular enclosure, is provided with cylindrical metal in the chamber, and said cylindrical metal is connected with the resonant cavity bottom away from an end of base openings; Said cover plate has metallic channel near the one side of base, in the said metallic channel inner wire is arranged; Said resonant cavity is arranged in a side of inner wire along the axis of inner wire.
Inner wire and metallic channel constitute transmission line, said inner wire and the insulation of metallic channel inwall, and the shape of cross section of metallic channel is a rectangle.
The said shape of cross section that is positioned at the cylindrical metal of intra is a rectangle, and the transverse width of said cylindrical metal is greater than the width that is positioned at the metallic channel on the cover plate.
Said cylindrical metal is provided with metallic plate at the end away from the resonant cavity bottom, and the transverse width of metallic plate is greater than the width that is positioned at the metallic channel on the cover plate.
Said cylindrical metal is provided with metallic plate at the end away from resonant cavity bottom, and metallic plate at relative two ends to the resonant cavity bottom bend, perhaps metallic plate respectively at horizontal and vertical opposite end to the resonant cavity bottom bend.
Said resonant cavity bottom also is provided with two metal steps, has the gap between said metal step and the cylindrical metal.
Said cover plate is provided with frequency tuning screw and coupling tuning screw, and said coupling tuning screw runs through cover plate and extends into metallic channel inside, and has the gap between coupling tuning screw and the inner wire; Said frequency tuning screw runs through cover plate and extends into intra, and has the gap between frequency tuning screw and the cylindrical metal.
Be connected with Supporting Media in the said metallic channel, inner wire runs through and is arranged on Supporting Media inside.
From foregoing, can find out; A kind of band stop filter of the utility model comprises the resonant cavity of the transmission line that connects extraneous and band stop filter or be connected adjacent resonators in the band stop filter and at least one rectangle and is positioned at the cylindrical metal of the rectangle of intra.Said resonant cavity is a rectangle column cavity, and the axis of resonant cavity and the axis normal of inner wire have been avoided under the enough big situation of resonant cavity juxtaposition between chamber and the chamber.Intra is provided with the rectangle cylindrical metal, and cylindrical metal is fixed on resonant cavity bottom and only is connected with the chamber wall of resonant cavity in the resonant cavity bottom, and the position in resonant cavity and the degree of depth can not be regulated outside resonant cavity.We can make the resonance frequency of resonant cavity and design load very approaching through the milling technology processing of precision, adopt tuning screw to accomplish the tuning of resonant cavity at last.
Said cylindrical metal top is provided with the metallic plate that only is connected with cylindrical metal, can dwindle the volume of resonant cavity like this, increases the difference between resonant cavity basic mode and the higher mode resonance frequency simultaneously, helps realizing the band stop filter of parasitic stopband far away.
Said metallic plate two ends are crooked to the resonant cavity bottom direction.We can further dwindle the volume of resonant cavity like this, increase the basic mode of resonant cavity and the difference between the higher mode resonance frequency simultaneously, will help realizing the band stop filter of farther parasitic stopband.
Said transmission line is made up of inner wire, outer conductor, wherein insulate between inner wire and the outer conductor, and the cross section of the metallic channel of transmission line is a rectangle.Characteristic impedance and electrical length that frequency tuning screw that is provided with and coupling tuning screw are used to regulate the transmission line between the different resonant cavitys, the coupling and the stopband that are beneficial in the accommodation zone resistance filter passband respond the symmetry with frequency.Transmission line is positioned on the cover plate; Can make us like this under the prerequisite of confirming the band stop filter bandwidth of rejection; Dwindle the distance of cylindrical metal or metallic plate and resonant cavity wall to greatest extent; Increase the wall of resonant cavity and the capacitive load at cylindrical metal top to greatest extent, thereby realize the miniaturization of resonant cavity and increase the basic mode of resonant cavity and the difference between the higher mode resonance frequency, to realize the band stop filter of farther parasitic stopband.
The frequency tuning screw stretches into intra and can outside resonant cavity, regulate, and its position is not directly over metal wire.In the utility model; Since the cylindrical metal in the resonant cavity or be arranged at the cylindrical metal top metallic plate overlook direction projection at least in one direction greater than the direction projection of overlooking of metal wire, promptly the transverse width of cylindrical metal or metallic plate is greater than near the width of metallic channel.The frequency tuning screw to the tuning simple of resonant cavity frequency and effectively like this.
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, and wherein a part continues transmission along transmission line, and another part gets in the resonant cavity and is reflected, and was 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, and a such resonant cavity has 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.
The advantage of the utility model is that processing is simple, debugging is convenient, compact conformation.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 is a cross-sectional view among the utility model embodiment.
Fig. 2 is an A-A profile among the utility model embodiment.
Fig. 3 is a B-B profile among the utility model embodiment.
Fig. 4 adds the cross-sectional view of metallic plate for column metal roof end among the utility model embodiment.
Fig. 5 be among the utility model embodiment column metal roof end metallic plate two ends to the cross-sectional view of resonant cavity bottom bend.
Fig. 6 is added with the cross-sectional view of metal step for resonant cavity bottom among the utility model embodiment.
Label among the figure is expressed as respectively: 1, inner wire; 2, resonant cavity; 3, cylindrical metal; 4, metallic channel; 5, cover plate; 6, frequency tuning screw; 7, Supporting Media; 8, metal step; 9, coaxial fitting inner wire; 10, coaxial fitting; 11, metallic plate; 12, coupling tuning 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, shown in 2,3, a kind of band stop filter comprises the base that is provided with 4 resonant cavitys 2, and the base openings position is connected with cover plate 5; Be provided with a cylindrical metal 3 in each resonant cavity 2, and an end of cylindrical metal 3 is connected with resonant cavity 2 bottom chamber wall; Cover plate 5 has metallic channel 4 near the one side of base; Be connected with 4 Supporting Medias 7 in the metallic channel 4; Inner wire 1 is through Supporting Media 7; Inner wire 1 two ends all are connected with coaxial fitting inner wire 9, and cover plate 5 outer walls are provided with coaxial fitting 10, and coaxial fitting inner wire 9 is arranged on coaxial fitting 10 inside; Cover plate 5 faces of each resonant cavity 2 top are provided with at least two frequency tuning screws 6; Coupling tuning screw 12 runs through cover plate 5 and extends into metallic channel 4 inside, and has the gap between coupling tuning screw 12 and the inner wire 1; Frequency tuning screw 6 runs through cover plate 5 and extends into resonant cavity 2 inside, and has the gap between frequency tuning screw 6 and the cylindrical metal 3; The parallel axes of the axis of frequency tuning screw 6 and resonant cavity 2 and with the axis normal of inner wire 1.The height of Supporting Media 7 equals the degree of depth of metallic channel 4; The transmission line of inner wire 1 and metallic channel 4 formations; Resonant cavity 2 is arranged in a side of inner wire 1 along the axis of inner wire 1.Inner wire 1 and the insulation of metallic channel 4 inwalls, and the shape of cross section of metallic channel 4 is a rectangle.Resonant cavity 2 is a rectangle column cavity, and the shape of cross section that is positioned at the inner cylindrical metal 3 of resonant cavity 2 is a rectangle; The transverse width of cylindrical metal 3 is greater than near the width of metallic channel 4.
Embodiment two
As shown in Figure 4, be that cylindrical metal 3 tops add a metallic plate 11 with embodiment one different place, and the transverse width of metallic plate 11 is greater than near the width of metallic channel 4.
Embodiment three
As shown in Figure 5, with embodiment two different places be metallic plate 11 at relative two ends to resonant cavity 2 bottom bend, perhaps metallic plate 11 respectively at horizontal and vertical opposite end to resonant cavity 2 bottom bend.In order to guarantee the quality of bandreject filtering, reclinate part is set to parallel with resonant cavity 2 inwalls.
Embodiment four
As shown in Figure 6, be that resonant cavity 2 bottoms are provided with two metal steps 8 with embodiment three different places.Metal step 8 can transversely be arranged or vertically arrange.The inner cylindrical metals of resonant cavity 2 can be any among the embodiment one to embodiment three.
Claims (8)
1. band stop filter, it is characterized in that: comprise the base that is provided with some resonant cavitys (2), said base openings position is connected with cover plate (5); Said resonant cavity (2) is the column rectangular enclosure, is provided with cylindrical metal (3) in the chamber, and said cylindrical metal (3) is connected with resonant cavity (2) bottom away from an end of base openings; Said cover plate (5) is provided with metallic channel (4) near the one side of base, and inner wire (1) is arranged in the said metallic channel (4); Said resonant cavity (2) is arranged in a side of inner wire (1) along the axis of inner wire (1).
2. a kind of band stop filter according to claim 1 is characterized in that: inner wire (1) and metallic channel (4) constitute transmission line, said inner wire (1) and the insulation of metallic channel (4) inwall, and the shape of cross section of metallic channel (4) is a rectangle.
3. a kind of band stop filter according to claim 1 is characterized in that: the said shape of cross section that is positioned at the inner cylindrical metal (3) of resonant cavity (2) is a rectangle, and said cylindrical metal (3) transverse width is greater than the width of inner wire (1).
4. a kind of band stop filter according to claim 1 is characterized in that: said cylindrical metal (3) is provided with metallic plate (11) at the end away from resonant cavity (2) bottom, and the transverse width of metallic plate (11) is greater than the width of inner wire (1).
5. a kind of band stop filter according to claim 1; It is characterized in that: said cylindrical metal (3) is provided with metallic plate (11) at the end away from resonant cavity (2) bottom; And metallic plate (11) at relative two ends to resonant cavity (2) bottom bend, perhaps metallic plate (11) respectively at horizontal and vertical opposite end all to resonant cavity (2) bottom bend.
6. a kind of band stop filter according to claim 1 is characterized in that: said resonant cavity (2) bottom also is provided with two metal steps (8), has the gap between said metal step (8) and the cylindrical metal (3).
7. according to any described a kind of band stop filter among the claim 1-6; It is characterized in that: said cover plate (5) is provided with frequency tuning screw (6) and coupling tuning screw (12); Said coupling tuning screw (12) runs through cover plate (5) and extends into metallic channel (4) inside; Said coupling tuning screw be positioned at inner wire (1) directly over, and have the gap between coupling tuning screw (12) and the inner wire (1); Said frequency tuning screw (6) runs through cover plate (5) and extends into resonant cavity (2) inside; Frequency tuning screw (6) is positioned at metallic plate (11) top; Have the gap between said frequency tuning screw and the inner wire (1), and and metallic plate (11) between have the gap.
8. according to any described a kind of band stop filter among the claim 1-6, it is characterized in that: be connected with Supporting Media (7) in the said metallic channel (4), inner wire (1) runs through and is arranged on Supporting Media (7) inside.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201120399285 CN202259612U (en) | 2011-10-19 | 2011-10-19 | Band elimination filter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201120399285 CN202259612U (en) | 2011-10-19 | 2011-10-19 | Band elimination filter |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202259612U true CN202259612U (en) | 2012-05-30 |
Family
ID=46120805
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201120399285 Withdrawn - After Issue CN202259612U (en) | 2011-10-19 | 2011-10-19 | Band elimination filter |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202259612U (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 |
| CN106099272A (en) * | 2016-08-30 | 2016-11-09 | 成都赛纳微波科技有限公司 | A kind of ridge coupling band elimination filter |
-
2011
- 2011-10-19 CN CN 201120399285 patent/CN202259612U/en not_active Withdrawn - After Issue
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 |
| CN106099272A (en) * | 2016-08-30 | 2016-11-09 | 成都赛纳微波科技有限公司 | A kind of ridge coupling band elimination filter |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US9472835B2 (en) | Filtering apparatus | |
| CN201966309U (en) | Compact-type band-resistance filter | |
| EP1732158A1 (en) | Microwave filter including an end-wall coupled coaxial resonator | |
| CN210015937U (en) | Filter, communication and radio frequency remote equipment, transceiver and tower top amplifier | |
| US20120293282A1 (en) | Waveguide filter having coupling screws | |
| EP4084213A1 (en) | Band-stop filter and radio frequency device | |
| CN102074775A (en) | Band elimination filter | |
| CN202259612U (en) | Band elimination filter | |
| CN102832429B (en) | Coaxial cavity filter | |
| CN202333095U (en) | Band-stop filter | |
| CN102324598A (en) | Adjustable band elimination filter | |
| CN201936972U (en) | Band elimination filter | |
| KR20150021138A (en) | Triple-mode Filter | |
| CN103066346B (en) | A kind of band stop filter | |
| CN103117434A (en) | Band rejection filter | |
| CN102244311B (en) | Compact band elimination filter | |
| CN108011162B (en) | Dielectric filter with hybrid coupling structure | |
| CN202058839U (en) | Small-sized double-band band pass filter | |
| CN202616376U (en) | Adjustable band-stop filter | |
| CN202259619U (en) | Compact band-stop filter | |
| CN202134639U (en) | Adjustable band-stop filter | |
| CN102386466A (en) | Adjustable comb-shaped filter | |
| CN112544012A (en) | Filter, communication and radio frequency remote equipment, transceiver and tower top amplifier | |
| CN206541912U (en) | A kind of quasi- high pass bandstop filter of cylindrical cavity | |
| CN114649657B (en) | TE-based 102 And TE (TE) 103 Double-passband multiple-transmission zero waveguide filter of mode |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned |
Granted publication date: 20120530 Effective date of abandoning: 20150729 |
|
| RGAV | Abandon patent right to avoid regrant |