CN2754227Y - Coaxial cavity semi-integrated total-parameter microwave band-stop filter - Google Patents
Coaxial cavity semi-integrated total-parameter microwave band-stop filter Download PDFInfo
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- CN2754227Y CN2754227Y CN 200420102691 CN200420102691U CN2754227Y CN 2754227 Y CN2754227 Y CN 2754227Y CN 200420102691 CN200420102691 CN 200420102691 CN 200420102691 U CN200420102691 U CN 200420102691U CN 2754227 Y CN2754227 Y CN 2754227Y
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- resonant rod
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- stop filter
- microwave band
- coaxial cavity
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Abstract
The utility model relates to a coaxial cavity semi-integrated total-parameter microwave band rejection filter which is to solve the problem that the attenuation of pass bands is too big while the attenuation of stop bands is not big enough at the time of a microwave high end in the existing band rejection filters. In the utility model, series resonance units are composed of a self equivalent inductor of resonance rods 2 and an equivalent capacitor produced by the gap between an end face of the resonance rods 2 and a transmission rod 1, the length of the resonance rods between the first end of each of the resonance rods 2 and short-circuit blocks 4 is smaller than one quarter of the band rejection central wavelength, and the length requirements for the positions of the series resonance units are met; the series resonance units are orderly arranged and form a series resonance unit array on the transmission rod 1 at the intervals approximate to the quarter of the band rejection central wavelength. The coaxial cavity semi-integrated total-parameter microwave band rejection filter of the utility model has the advantages of small insertion abrasiveness (within 0.2 dB), small dispersion, simple manufacturing process, high rejection of the stop bands, etc.; the attenuation of the stop bands can reach over 80 dB within the frequency range of 300 MHz to 6 GHz.
Description
Technical field
The utility model relates to microwave band-elimination filter, more particularly, relates to a kind of coaxial cavity half Lumped Constant Microwave band stop filter.
Background technology
Conventional now band stop filter generally adopts lumped parameter design below 6GHz, microwave is high-end a lot of difficulties will to occur but arrived, and main is pass band damping too big (generally greater than 1dB), and stopband attenuation generally can only be accomplished 40dB.Simultaneously, arrived microwave when high-end, the electric capacity of lumped parameter, the parasitic parameter of inductance are too big, and some circuit may just can't be realized at all.
The utility model content
At the above-mentioned defective of prior art, the utility model will solve the too big and big inadequately problem of stopband attenuation of existing band stop filter pass band damping when microwave is high-end.
For solving the problems of the technologies described above, the utility model provides a kind of coaxial cavity half Lumped Constant Microwave band stop filter, comprising a metallic cavity, in described cavity, be equipped with a transmission pole, a plurality of resonant rod and and with a plurality of one to one short-circuit blocks of each resonant rod; Described each resonant rod is vertical with described transmission pole, and evenly arranges along transmission pole, and the distance between adjacent two resonant rods approximates 1/4th of band resistance centre wavelength; For each resonant rod, a minim gap is arranged between its first end and the described transmission pole, its second end then is connected with described cavity by a corresponding short-circuit block, described short-circuit block is used to regulate the effective length of described resonant rod, make the length between described resonant rod first end end face and the short-circuit block hinder 1/4th of centre wavelength, and satisfy the length requirement of its position less than band.
In the utility model, preferably the end face with first end of each resonant rod is designed to the plane, then on described transmission pole with each resonant rod over against the position an interior concane gap is set, and make described in the surface of concane gap and the end face of described resonant rod first end be parallel to each other.
In the utility model, described cavity can be made up of the can of a upper opening and the cover plate at a upper opening place that removably is contained in described can.Wherein also be provided with two joints, described two joints are contained in the two ends of described transmission pole respectively, stretch out and expose to described cavity.
In the band stop filter of the present utility model, can be at the sidewall setting and a plurality of one to one fixing threaded holes of each resonant rod of described cavity, and screw rod being set at second end of each resonant rod, described screw rod can pass corresponding with it fixing threaded hole, and realizes fixing by nut engaged with it.
In the band stop filter of the present utility model, but offer a through hole on each short-circuit block, second end of Dui Ying resonant rod pierces into this through hole with it, and contacts with short-circuit block; The top of described short-circuit block and/or bottom then are connected with described cover plate and/or can by screw respectively.In addition, be preferably between adjacent two short-circuit blocks dividing plate is set, make to keep independence between each short-circuit block, and make also maintenance independence between each resonant rod.
Pass through technique scheme, band stop filter of the present utility model utilizes the resonant rod of transmission pole to form the series resonance unit, be arranged in order according to the spacing that approximates 1/4th centre wavelengths on transmission pole by these series resonance unit again, form series resonance unit battle array.These series resonance unit battle arrays compositions are cut Bueche husband type series resonance unit battle array.In 300MHz～6GHz frequency range, its Insertion Loss can accomplish that in the 0.2dB, stopband attenuation can be accomplished 80dB.As seen, coaxial cavity half Lumped Constant Microwave band stop filter of the present utility model has advantages such as Insertion Loss is little, chromatic dispersion is little, technology is simple, stopband attenuation is big.
Description of drawings
The utility model is described in further detail below in conjunction with drawings and Examples, in the accompanying drawing:
Fig. 1 is the structural representation of coaxial cavity half Lumped Constant Microwave band stop filter in preferred embodiment of the utility model;
Fig. 2 removes schematic diagram afterwards with the cover plate among Fig. 1;
Fig. 3 is the A-A cutaway view of Fig. 2;
Fig. 4 is the equivalent circuit diagram of the half Lumped Constant Microwave band stop filter of coaxial cavity shown in Fig. 1;
Fig. 5 is the frequency response curve of coaxial cavity half Lumped Constant Microwave band stop filter in preferred embodiment of the utility model.
Embodiment
In preferred embodiment of the utility model, the structure of coaxial cavity half Lumped Constant Microwave band stop filter as shown in Figure 1 to Figure 3.Wherein, cavity is made up of the can 3 of a upper opening and the metal cover board 5 at a upper opening place that removably is contained in can.Two joints 6 are contained in the two ends of transmission pole 1 respectively, stretch out and expose to cavity.Sidewall at can 3 is provided with and a plurality of one to one fixing threaded holes of each resonant rod, second end at each resonant rod 2 is provided with screw rod 8, this screw rod passes with it corresponding fixing threaded hole, and realize by nut engaged 9 with it fixing, realize simultaneously with cavity between be electrically connected.
Wherein, a minim gap is arranged between first end of each root resonant rod 2 and the transmission pole 1, second end then pierce on the short-circuit block 4 through hole and with short-circuit block have the contact be connected, the upper and lower of short-circuit block is connected with can 6 with cover plate 5 by screw respectively again.Short-circuit block 4 is by its short circuit effect, and the effective length of scalable resonant rod 2 makes the length between resonant rod first end end face and the short-circuit block hinder 1/4th of centre wavelength less than band, and satisfies the length requirement of its position.In addition, between adjacent two short-circuit blocks dividing plate 10 is set, it makes and keeps independence between each short-circuit block, and makes also maintenance independence between each resonant rod.
Wherein, transmission pole 1 and can 3, cover plate 5, transmission line of joint 6 common compositions, its characteristic impedance is 50 ohm.Simultaneously, resonant rod 2 and can 3, short-circuit block 4, the cover plate 5 common transmission lines of forming a terminal short circuit, main equivalence is a distributed inductance.Its equivalent characteristic impedance is slightly larger than 50 ohm.
As shown in Figure 2, each resonant rod 2 is vertical with transmission pole, and by identical spacing parallel arranged successively, and its quantity can be infinite a plurality ofly in theory, and the distance between adjacent two resonant rods approximates 1/4th of band resistance centre wavelength.The main equivalence of minim gap between resonant rod 2 and the transmission pole 1 is a distributed capacitance.These Equivalent Distributed electric capacity and distributed inductance are formed the series resonance unit.A plurality of series resonances unit just constitutes coaxial cavity half Lumped Constant Microwave band stop filter.
In addition, as seen from Figure 2, in order effectively to regulate described distributed capacitance, on transmission pole 1, dig be provided with resonant rod 2 over against interior concane gap 11, the surface of interior concane gap and the end face of resonant rod are parallel to each other, and constitute described minim gap between the two.These breach also have following effect:
1) compensates the small discontinuity that the series resonance unit is caused transmission pole 1;
2) spacing between increase transmission pole 1 and the resonant rod 2, thus power capacity improved.
Fig. 4 shows the equivalent electric circuit of this coaxial cavity half Lumped Constant Microwave band stop filter.This cuts the design of Bueche husband type according to seven rank, and seven resonant rods are wherein arranged.Designing requirement maximum transmitted in 0～2170MHz passband decays to 0.2dB, and decay is greater than 80dB in 2400～2480MHz.According to giving condition, can obtain low pass original shape order is n=7.By anti-normalization and frequency translation, just can obtain the actual components value of coaxial cavity half Lumped Constant Microwave band stop filter again.By calculating, just can obtain the specific targets of each unit again.According to these indexs, can regulate the resonant rod size by short-circuit block, thereby adjust corresponding distributed inductance, to satisfy requirement as shown in Figure 4 to inductance parameters; Simultaneously, by adjusting the gap between the concane gap in resonant rod first end end face and the transmission pole, can satisfy requirement as shown in Figure 4 to capacitance parameter.Wherein, the size of electric capacity can directly be determined an initial value with the computing formula of parallel plate capacitor, and the HFSS of simulation software by Ansoft optimizes and gets final product again.
Fig. 5 shows the frequency response curve of the utility model coaxial cavity half Lumped Constant Microwave band stop filter.Wherein the CH1 passage is the oscillogram of port return loss, and the CH2 passage is the oscillogram of transmission passband and stopband inhibition.Being the passband curve chart between 1 o'clock to 2 o'clock, is the stopband curve chart between 3 o'clock to 4 o'clock.As can be seen from the figure, the passband Insertion Loss between 1 o'clock to 2 o'clock is not more than 0.2dB, and return loss was not less than for 20.895 (being better than 1.2 standing wave).Stopband between 3 o'clock to 4 o'clock suppresses to be not less than 82dB.Reached desired high the inhibition, the requirement of low Insertion Loss.
Claims (7)
1, a kind of coaxial cavity half Lumped Constant Microwave band stop filter is characterized in that, comprises a metallic cavity, in described cavity, be equipped with a transmission pole (1), a plurality of resonant rod (2) and with a plurality of one to one short-circuit blocks of each resonant rod (4);
Described each resonant rod is vertical with described transmission pole, and evenly arranges along transmission pole, and the distance between adjacent two resonant rods approximates 1/4th of band resistance centre wavelength;
For each resonant rod, a minim gap is arranged between its first end and the described transmission pole, its second end then is connected with described cavity by a corresponding short-circuit block, described short-circuit block is used to regulate the effective length of described resonant rod, make the length between described resonant rod first end end face and the short-circuit block hinder 1/4th of centre wavelength, and satisfy the length requirement of its position less than band.
2, coaxial cavity half Lumped Constant Microwave band stop filter according to claim 1, it is characterized in that, the end face of first end of each resonant rod is the plane, on described transmission pole with each resonant rod over against the position, also be provided with an interior concane gap (11), the surface of described interior concane gap and the end face of described resonant rod first end are parallel to each other.
3, coaxial cavity half Lumped Constant Microwave band stop filter according to claim 2 is characterized in that, described cavity is made up of the can (3) of a upper opening and the cover plate (5) at a upper opening place that removably is contained in described can.
4, coaxial cavity half Lumped Constant Microwave band stop filter according to claim 3 is characterized in that, also comprise two joints (6), described two joints are contained in the two ends of described transmission pole respectively, stretches out and exposes to described cavity.
5, coaxial cavity half Lumped Constant Microwave band stop filter according to claim 4, it is characterized in that, sidewall at described cavity is provided with and a plurality of one to one fixing threaded holes of each resonant rod, second end at each resonant rod is provided with screw rod, described screw rod passes corresponding with it fixing threaded hole, and by the nut engaged realization is fixing with it.
6, according to each described coaxial cavity half Lumped Constant Microwave band stop filter among the claim 1-5, it is characterized in that, offer a through hole on each short-circuit block (4), second end of Dui Ying resonant rod pierces into this through hole with it, and contacts with short-circuit block; The top of described short-circuit block and/or bottom then are connected with described cover plate and/or can by screw respectively.
7, coaxial cavity half Lumped Constant Microwave band stop filter according to claim 6 is characterized in that, also is provided with dividing plate (10) between adjacent two short-circuit blocks, makes to keep independent between each short-circuit block, also keeps independent between each resonant rod.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200420102691 CN2754227Y (en) | 2004-12-10 | 2004-12-10 | Coaxial cavity semi-integrated total-parameter microwave band-stop filter |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200420102691 CN2754227Y (en) | 2004-12-10 | 2004-12-10 | Coaxial cavity semi-integrated total-parameter microwave band-stop filter |
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| Publication Number | Publication Date |
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| CN2754227Y true CN2754227Y (en) | 2006-01-25 |
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| CN 200420102691 Expired - Fee Related CN2754227Y (en) | 2004-12-10 | 2004-12-10 | Coaxial cavity semi-integrated total-parameter microwave band-stop filter |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101847767A (en) * | 2010-05-27 | 2010-09-29 | 摩比天线技术（深圳）有限公司 | Band elimination filter, manufacturing method of band elimination filter and filtering device |
| CN102324598A (en) * | 2011-08-01 | 2012-01-18 | 成都赛纳赛德科技有限公司 | Adjustable band elimination filter |
| CN102354778A (en) * | 2011-08-24 | 2012-02-15 | 京信通信系统（中国）有限公司 | Elliptic function low-path filtering path and communication cavity device adopting same |
| CN102623776A (en) * | 2012-03-20 | 2012-08-01 | 中国计量学院 | Coaxial cavity-based rejection filter |
| CN101902213B (en) * | 2010-01-07 | 2013-08-07 | 陈艳艳 | Method for controlling signal attenuation and attenuation type balanced control circuit |
| CN105406831A (en) * | 2015-12-21 | 2016-03-16 | 成都新欣神风电子科技有限公司 | Semi-lumped microwave band-pass filtering circuit and filter |
| CN107658533A (en) * | 2017-10-20 | 2018-02-02 | 京信通信系统（中国）有限公司 | Bandstop filter and radio-frequency devices |
| CN108199124A (en) * | 2018-02-08 | 2018-06-22 | 京信通信系统（中国）有限公司 | Elliptic Function Type low-pass filter and radio-frequency devices |
-
2004
- 2004-12-10 CN CN 200420102691 patent/CN2754227Y/en not_active Expired - Fee Related
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101902213B (en) * | 2010-01-07 | 2013-08-07 | 陈艳艳 | Method for controlling signal attenuation and attenuation type balanced control circuit |
| CN101847767A (en) * | 2010-05-27 | 2010-09-29 | 摩比天线技术（深圳）有限公司 | Band elimination filter, manufacturing method of band elimination filter and filtering device |
| CN101847767B (en) * | 2010-05-27 | 2012-12-05 | 摩比天线技术（深圳）有限公司 | Band elimination filter, manufacturing method of band elimination filter and filtering device |
| CN102324598A (en) * | 2011-08-01 | 2012-01-18 | 成都赛纳赛德科技有限公司 | Adjustable band elimination filter |
| CN102354778A (en) * | 2011-08-24 | 2012-02-15 | 京信通信系统（中国）有限公司 | Elliptic function low-path filtering path and communication cavity device adopting same |
| CN102623776A (en) * | 2012-03-20 | 2012-08-01 | 中国计量学院 | Coaxial cavity-based rejection filter |
| CN105406831A (en) * | 2015-12-21 | 2016-03-16 | 成都新欣神风电子科技有限公司 | Semi-lumped microwave band-pass filtering circuit and filter |
| CN107658533A (en) * | 2017-10-20 | 2018-02-02 | 京信通信系统（中国）有限公司 | Bandstop filter and radio-frequency devices |
| CN108199124A (en) * | 2018-02-08 | 2018-06-22 | 京信通信系统（中国）有限公司 | Elliptic Function Type low-pass filter and radio-frequency devices |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C56 | Change in the name or address of the patentee |
Owner name: GRANVILLE TECHNOLOGY CO., LTD., SHENZHEN CITY Free format text: FORMER NAME OR ADDRESS: WEITONG TECHNOLOGY CO., LTD., SHENZHEN CITY |
|
| CP03 | Change of name, title or address |
Address after: Guangdong city of Shenzhen province Baoan District Xixiang Baoyuan road Baosheng Industrial Park A building 3 floor, zip code: 518102 Patentee after: Shenzhen Weitong Technology Co., Ltd. Address before: Guangdong city of Shenzhen province Baoan District Xixiang Baoyuan road Baosheng Industrial Park A building 3 floor, zip code: 518102 Patentee before: Weitong Science-Technology Co., Ltd., Shenzhen |
|
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20060125 Termination date: 20121210 |