CN103066346A - Band elimination filter - Google Patents
Band elimination filter Download PDFInfo
- Publication number
- CN103066346A CN103066346A CN2011103186102A CN201110318610A CN103066346A CN 103066346 A CN103066346 A CN 103066346A CN 2011103186102 A CN2011103186102 A CN 2011103186102A CN 201110318610 A CN201110318610 A CN 201110318610A CN 103066346 A CN103066346 A CN 103066346A
- 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.)
- Granted
Links
Images
Abstract
The invention discloses a band elimination filter which comprises a base, wherein four resonant cavities are arranged in the base and a cover plate is connected with the opening position of the base. The band elimination filter has the advantages of being simple in processing, low in processing cost, convenient to debug, and capable of being widely used for an electric system in each microwave region, particularly the military and civil field such as radar, missile guidance and communication.
Description
Technical field
The present invention relates to filter, specifically, relate to a kind of a kind of band stop filter that utilizes coaxial transmission line and resonant cavity coupling to consist of.
Background technology
Microwave transmission line sidewall a sealing increases a coupled resonator, can some frequency produce transmission zero on the transmission curve of transmission line, thereby stops 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 by these and are realized 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 be changed outside filter, can regulate simultaneously the resonance frequency resonant cavity of resonant cavity and the coupling between the transmission line.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 of the screw on the resonant cavity on the metal column select to bring difficulty.If too loose, after screw structural locking, the screw axis direction is uncertain in resonant cavity, can make filter fine setting difficult.If too tightly will make metal column rotate difficulty, and also can make the debugging difficult of filter.In addition, in order to obtain symmetrical stopband response, the electrical length that needs in theory transmission line between the resonant cavity is 1/4 of stopband center frequency place wavelength.When stop-band frequency is higher, require the length of transmission line very short, this will cause the distance between each resonant cavity very near.Guaranteeing that the volume of resonant cavity can not be too little in the enough little situation of band stop filter insertion loss, like this between chamber and the chamber even the phenomenon of juxtaposition may occur.
Summary of the invention
The object of the present invention is to provide a kind of band stop filter convenient, compact conformation of processing simply, debug.
For achieving the above object, the technical solution used in the present invention is: a kind of band stop filter is characterized in that: comprise the base that is provided with some resonant cavitys, described base openings position is connected with cover plate; Described resonant cavity is the column rectangular enclosure, is provided with cylindrical metal in the chamber, and described cylindrical metal is connected with the resonant cavity bottom away from an end of base openings; Described cover plate has metallic channel near the one side of base, in the described metallic channel inner wire is arranged; Described resonant cavity is arranged in a side of inner wire along the axis of inner wire.
Inner wire and metallic channel consist of transmission line, described inner wire and the insulation of metallic channel inwall, and the shape of cross section of metallic channel is rectangle.
The described shape of cross section that is positioned at the cylindrical metal of intra resonant cavity is rectangle, and the transverse width of described cylindrical metal is greater than the width that is positioned at the metallic channel on the cover plate.
Described 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.
Described 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.
Described resonant cavity bottom also is provided with two metal steps, has the gap between described metal step and the cylindrical metal.
Described cover plate is provided with frequency tuning screw and coupling tuning screw, and described 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; Described frequency tuning screw runs through cover plate and extends into intra resonant cavity, and has the gap between frequency tuning screw and the cylindrical metal.
Be connected with Supporting Media in the described 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 present invention 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 resonant cavity.Described resonant cavity is rectangle column cavity, and the axis of resonant cavity is vertical with the axis of inner wire, has avoided at resonant cavity enough in the large situation juxtaposition between chamber and the chamber.Intra resonant cavity 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 by the milling technology processing of precision, adopt at last tuning screw to finish the tuning of resonant cavity.
Described cylindrical metal top is provided with the metallic plate that only is connected with cylindrical metal, can dwindle like this volume of resonant cavity, increases simultaneously the difference between Fundamental mode of cavity and the high-order mode resonance frequency, is conducive to realize the band stop filter of parasitic stopband far away.
Described metallic plate two ends are crooked to the resonant cavity bottom direction.We can further dwindle the volume of resonant cavity like this, increase simultaneously the basic mode of resonant cavity and the difference between the high-order mode resonance frequency, will be conducive to realize the band stop filter of farther parasitic stopband.
Described transmission line is comprised 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 rectangle.The frequency tuning screw that arranges and coupling tuning screw are beneficial to the interior coupling of accommodation zone resistance filter passband and stopband response with the symmetry of frequency for characteristic impedance and the electrical length of regulating the transmission line between the different resonant cavitys.Transmission line is positioned on the cover plate, can make like this us under the prerequisite of determining the band stop filter bandwidth of rejection, dwindle to greatest extent the distance of cylindrical metal or metallic plate and resonant cavity wall, increase to greatest extent the wall of resonant cavity and the capacitive load at cylindrical metal top, thereby realize the miniaturization of resonant cavity and increase the basic mode of resonant cavity and the difference between the high-order mode resonance frequency, to realize the band stop filter of farther parasitic stopband.
The frequency tuning screw stretches into intra resonant cavity and can regulate outside resonant cavity, and its position is not directly over metal wire.Among the present invention, 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, namely 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 described below:
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 enters in the resonant cavity and is reflected back, 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 with distribute for the first time after differ 180 when spending along the signal phase of transmission line, two parts of signals will be cancelled out each other, so that it is very low to continue the resultant signal amplitude of transmission along transmission line.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 allow be in pass through of signal in the passband so that the signal that is in the stop-band frequency still less passes through simultaneously.
The invention has the advantages that processing is simple, debugging is convenient, compact conformation.Band stop filter of the present invention is expected to be widely used in the electronic system of each microwave band, particularly military affairs and the civil areas such as radar, missile guidance, communication.
Description of drawings
Fig. 1 is cross-sectional view in the embodiment of the invention.
Fig. 2 is A-A profile in the embodiment of the invention.
Fig. 3 is B-B profile in the embodiment of the invention.
Fig. 4 is the cross-sectional view that column metal roof end adds metallic plate in the embodiment of the invention.
Fig. 5 be in the embodiment of the invention column metal roof end metallic plate two ends to the cross-sectional view of resonant cavity bottom bend.
Fig. 6 is the cross-sectional view that the resonant cavity bottom is added with the metal step in the embodiment of the invention.
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 present invention is described in further detail, but embodiments of the present invention are not limited to this.
Embodiment one
Such as 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, 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 axis of frequency tuning screw 6 is parallel with the axis of resonant cavity 2 and vertical with the axis of inner wire 1.The height of Supporting Media 7 equals the degree of depth of metallic channel 4; The transmission line that inner wire 1 and metallic channel 4 consist of; 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 rectangle.Resonant cavity 2 is rectangle column cavity, and the shape of cross section that is positioned at the cylindrical metal 3 of resonant cavity 2 inside is 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, the places different from embodiment one are that cylindrical metal 3 tops add a metallic plate 11, 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, the place different from embodiment two 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, the place different from embodiment three is that resonant cavity 2 bottoms are provided with two metal steps 8.Metal step 8 can transversely be arranged or vertically arrange.The cylindrical metal of resonant cavity 2 inside 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), described base openings position is connected with cover plate (5); Described resonant cavity (2) is the column rectangular enclosure, is provided with cylindrical metal (3) in the chamber, and described cylindrical metal (3) is connected with resonant cavity (2) bottom away from an end of base openings; Described cover plate (5) is provided with metallic channel (4) near the one side of base, and inner wire (1) is arranged in the described metallic channel (4); Described 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) consist of transmission line, and described inner wire (1) and metallic channel (4) inwall insulate, and the shape of cross section of metallic channel (4) is rectangle.
3. a kind of band stop filter according to claim 1 is characterized in that: the described shape of cross section that is positioned at the inner cylindrical metal (3) of resonant cavity (2) is rectangle, and described 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: described 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: described 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: also be provided with two metal steps (8) bottom the described resonant cavity (2), have the gap between described metal step (8) and the cylindrical metal (3).
7. the described a kind of band stop filter of any one according to claim 1-6, it is characterized in that: be provided with frequency tuning screw (6) and coupling tuning screw (12) on the described cover plate (5), described coupling tuning screw (12) runs through cover plate (5) and extends into metallic channel (4) inside, described 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); Described 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 described frequency tuning screw and the inner wire (1), and and metallic plate (11) between have the gap.
8. the described a kind of band stop filter of any one according to claim 1-6 is characterized in that: be connected with Supporting Media (7) in the described 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 |
|---|---|---|---|
| CN201110318610.2A CN103066346B (en) | 2011-10-19 | 2011-10-19 | A kind of band stop filter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110318610.2A CN103066346B (en) | 2011-10-19 | 2011-10-19 | A kind of band stop filter |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN103066346A true CN103066346A (en) | 2013-04-24 |
| CN103066346B CN103066346B (en) | 2015-07-29 |
Family
ID=48108871
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201110318610.2A Active CN103066346B (en) | 2011-10-19 | 2011-10-19 | A kind of band stop filter |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN103066346B (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2023174110A1 (en) * | 2022-03-17 | 2023-09-21 | 华为技术有限公司 | Waveguide assembly and communication apparatus |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6529094B1 (en) * | 1999-08-24 | 2003-03-04 | Murata Manufacturing Co. Ltd. | Dielectric resonance device, dielectric filter, composite dielectric filter device, dielectric duplexer, and communication apparatus |
| CN201417811Y (en) * | 2009-06-10 | 2010-03-03 | 大富（深圳）科技有限公司 | Resonating tube and cavity filter with the resonating tube |
| CN102074775A (en) * | 2011-01-24 | 2011-05-25 | 成都赛纳赛德科技有限公司 | Band elimination filter |
-
2011
- 2011-10-19 CN CN201110318610.2A patent/CN103066346B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6529094B1 (en) * | 1999-08-24 | 2003-03-04 | Murata Manufacturing Co. Ltd. | Dielectric resonance device, dielectric filter, composite dielectric filter device, dielectric duplexer, and communication apparatus |
| CN201417811Y (en) * | 2009-06-10 | 2010-03-03 | 大富（深圳）科技有限公司 | Resonating tube and cavity filter with the resonating tube |
| CN102074775A (en) * | 2011-01-24 | 2011-05-25 | 成都赛纳赛德科技有限公司 | Band elimination filter |
Non-Patent Citations (1)
| Title |
|---|
| 彭安尽等: "一种小型化带阻滤波器的设计", 《2011年全国微波毫米波会议论文集（上册）》 * |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2023174110A1 (en) * | 2022-03-17 | 2023-09-21 | 华为技术有限公司 | Waveguide assembly and communication apparatus |
Also Published As
| Publication number | Publication date |
|---|---|
| CN103066346B (en) | 2015-07-29 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN102084540B (en) | Multi-mode resonant filter | |
| KR101484934B1 (en) | High frequency filter with closed circuit coupling | |
| EP1732158A1 (en) | Microwave filter including an end-wall coupled coaxial resonator | |
| CN201966309U (en) | Compact-type band-resistance filter | |
| KR100992089B1 (en) | Band rejection filter | |
| US10116026B2 (en) | Coaxial filter having first to fifth resonators, where the fourth resonator is an elongated resonator | |
| US4620168A (en) | Coaxial type tunable hyperfrequency elimination band filter comprising of dielectric resonators | |
| KR101386941B1 (en) | Band rejection filter of assembly type | |
| CN101989675A (en) | Semi-coaxial resonator and filter device | |
| KR20170019876A (en) | Resonator of radio frequency filter | |
| CN102074775A (en) | Band elimination filter | |
| CN202259612U (en) | Band elimination filter | |
| CN102324598A (en) | Adjustable band elimination filter | |
| CN202333095U (en) | Band-stop filter | |
| CN103066346B (en) | A kind of band stop filter | |
| CN103117434A (en) | Band rejection filter | |
| CN201936972U (en) | Band elimination filter | |
| KR20150021138A (en) | Triple-mode Filter | |
| CN108011162B (en) | Dielectric filter with hybrid coupling structure | |
| KR101274031B1 (en) | Band rejection filter for controlling return loss of pass band | |
| KR101026416B1 (en) | Apparatus for fixing open type notch and notch filter with it | |
| CN102244311B (en) | Compact band elimination filter | |
| CN202616376U (en) | Adjustable band-stop filter | |
| CN102386466A (en) | Adjustable comb-shaped filter | |
| CN202259619U (en) | Compact band-stop filter |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant |