CN105914433B - A kind of bandstop filter applied to broadband receiver - Google Patents
A kind of bandstop filter applied to broadband receiver Download PDFInfo
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- CN105914433B CN105914433B CN201610290656.0A CN201610290656A CN105914433B CN 105914433 B CN105914433 B CN 105914433B CN 201610290656 A CN201610290656 A CN 201610290656A CN 105914433 B CN105914433 B CN 105914433B
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- 230000005540 biological transmission Effects 0.000 claims abstract description 44
- 238000004080 punching Methods 0.000 claims description 2
- 238000004891 communication Methods 0.000 description 2
- 238000013461 design Methods 0.000 description 2
- 238000011835 investigation Methods 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 208000032365 Electromagnetic interference Diseases 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000003071 parasitic effect Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Classifications
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01P—WAVEGUIDES; RESONATORS, LINES, OR OTHER DEVICES OF THE WAVEGUIDE TYPE
- H01P1/00—Auxiliary devices
- H01P1/20—Frequency-selective devices, e.g. filters
- H01P1/201—Filters for transverse electromagnetic waves
- H01P1/203—Strip line filters
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- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Shielding Devices Or Components To Electric Or Magnetic Fields (AREA)
Abstract
The invention discloses a kind of bandstop filter applied to broadband receiver, which includes microstrip structure and shielding cavity.Microstrip bandstop filter is made of 1/4 wavelength open line and 1/4 wavelength cascade transmission line, and in order to reduce filter area, open-circuit line is realized with L-type structure, and microstrip filter carries out doubling.In order to increase the electromagnetism interference performance of filter, shielding cavity is used.Shielding cavity, to being split, improves the resonance frequency of cavity in central part, and making it not influences microstrip filter performance.The present invention not only realizes the miniaturization of microstrip bandstop filter, but also has excavated its engineer application potentiality.
Description
Technical field
The invention belongs to microwave telecommunication devices technical fields, more particularly, to a kind of band applied to broadband receiver
Hinder filter.
Background technique
Electronics investigation receiver can receive and record the electronic equipments such as radio, radar and weapon control system and be emitted
Electromagnetic wave signal, find out the technical parameter and tactical qualities of these electronic equipments, obtain radio communication and the radar of other side
The military informations such as disposition are critical components particularly important in electronic warfare system.Larger Dynamic, wide instant bandwidth, broadband are to detect
Look into the Key Performance Indicator of receiver.In the actual environment, there are the electromagnetic interferences such as base station, civilian wireless communication, and these
Interference has biggish leak level, can be received by broadband receiver and block the electromagnetic signal for needing to supervise, reduce investigation efficiency
And performance.It is necessary to inhibit after the antenna, before receiver to useless interference signal.
Bandstop filter is the effective means for realizing above-mentioned function.But cavity body filter volume is big, stopband is narrow, passes through cascade
Mode realizes that Wide stop bands not only increase loss, and volume and weight has also been significantly greatly increased；Lumped filter is parasitic big, and design is complicated,
Reliability and consistency are poor；Microstrip filter is small in size, light-weight, consistency is high, but engineer application difficulty is big.
Summary of the invention
Aiming at the above defects or improvement requirements of the prior art, the present invention provides a kind of bands applied to broadband receiver
Filter is hindered, has the advantages that small in size, light-weight, high reliablity, and be able to solve existing microstrip filter engineer application
The big technical problem of difficulty.
To achieve the above object, according to one aspect of the present invention, a kind of band resistance applied to broadband receiver is provided
Filter, including microstrip circuit structure and shielding cavity, microstrip circuit are fixed in shielding cavity, and microstrip circuit includes defeated
Inbound port, output port, 6 section of 1/4 wavelength L-type open-circuit line, 5 section of 1/4 wavelength cascade transmission line；Input port and the first order 1/4
Wavelength cascades transmission line and is connected, and connects 1/4 wavelength L-type open-circuit line of the first order therebetween；1/4 wavelength of the first order cascades transmission line
It is connected with 1/4 wavelength of second level cascade transmission line, connects 1/4 wavelength L-type open-circuit line of the second level therebetween；1/4 wave of the second level
Long cascaded transmission line is connected with 1/4 wavelength of third level cascade transmission line, connects 1/4 wavelength L-type open-circuit line of the third level therebetween；
1/4 wavelength of the third level cascades transmission line and is connected with 1/4 wavelength of fourth stage cascade transmission line, connects 1/4 wave of the fourth stage therebetween
Long L-type open-circuit line；1/4 wavelength of the fourth stage cascades transmission line and is connected with 1/4 wavelength of level V cascade transmission line, connects therebetween
1/4 wavelength L-type open-circuit line of level V；1/4 wavelength of level V cascade transmission line is connected with output port, connection the 6th therebetween
1/4 wavelength L-type open-circuit line of grade.
Preferably, the passband of the bandstop filter be 1GHz~1.6GHz, 2.9GHz~6GHz, stopband be 1.7GHz~
2.7GHz, stopband inhibit to be greater than 40dBc.
Preferably, shielding cavity cover board is provided at the top of shielding cavity；The quadrangle of shielding cavity is provided with cavity installation
Hole；It is provided with screw hole on the side wall of shielding cavity, is used for fixed mask cavity cover board；It is provided with and beats in the two sides of shielding cavity
Hole anchor tip, respectively as outputting and inputting；Threaded hole is provided in shielding cavity, the positioning as fixed microstrip circuit
Hole；Through-hole is additionally provided in shielding cavity, as the location hole for connecting main cavity, microstrip circuit, shielding cavity cover board.
Preferably, shielding cavity cover board is used to shielding cavity being divided into U-shaped structure.
Preferably, the countersunk head screw of connection shielding cavity and shielding cavity cover board, shielding cavity cover board are provided in through-hole
It is connected by threaded hole and countersunk head screw with microstrip circuit, shielding cavity.
Preferably, the height h of shielding cavity cover board need to meet following relationship:
WhereinAir wavelength when for 1GHz.
Preferably, distance D of the open-circuit line away from shielding cavity side wall1Following relationship need to be met:
D1≥3Wx (2)
Wherein, WxFor line width of opening a way.
Preferably, the distance between cascaded transmission line and shielding cavity cover board 14 D2Following relationship need to be met:
D2≥3Wy (3)
Wherein, Wy is the width of cascaded transmission line.
In general, through the invention it is contemplated above technical scheme is compared with the prior art, can obtain down and show
Beneficial effect:
(1) present invention realizes microstrip structure by the way of special-shaped, doubling on the basis of conventional microstrip design method
Miniaturization；
(2) present invention carries filter main body using shielding cavity, reliable so as to the engineer application that improves filter
Property；
(3) microstrip filter of the invention and shielding cavity match, and shielding cavity uses U-shaped structure, improve cavity
Resonance frequency, reduce influence to microstrip filter performance, and improve the anti-interference ability of filter.
Detailed description of the invention
Fig. 1 is that the present invention is applied to microstrip circuit structure chart in the bandstop filter of broadband receiver.
Fig. 2 (a) and (b) are the main view that the present invention is applied to shielding cavity in the bandstop filter of broadband receiver respectively
And left view.
Fig. 3 (a), (b) and (c) are that the present invention is applied to shielding cavity cover board in the bandstop filter of broadband receiver respectively
Main view, left view and front view.
Specific embodiment
In order to make the objectives, technical solutions, and advantages of the present invention clearer, with reference to the accompanying drawings and embodiments, right
The present invention is further elaborated.It should be appreciated that the specific embodiments described herein are merely illustrative of the present invention, and
It is not used in the restriction present invention.As long as in addition, technical characteristic involved in the various embodiments of the present invention described below
Not constituting a conflict with each other can be combined with each other.
The present invention provides a kind of bandstop filter applied to broadband receiver, passband be 1GHz~1.6GHz,
2.9GHz~6GHz, stopband are 1.7GHz~2.7GHz, and stopband inhibits to be greater than 40dBc.
The bandstop filter that the present invention is applied to broadband receiver includes microstrip circuit and shielding cavity, wherein microstrip circuit
It is fixed in shielding cavity.
As shown in Figure 1.Microstrip circuit include input port 1,2,6 section of 1/4 wavelength L-type open-circuit line 3.1-3.6 of output port,
5 section of 1/4 wavelength cascade transmission line 4.1-4.5, connection shielding cavity cover board fixation hole 5, microstrip circuit fixation hole 6.
Input port 1 is connected with 1/4 wavelength of first order cascade transmission line 4.1, connects 1/4 wavelength L of the first order therebetween
Type open-circuit line 3.1；1/4 wavelength of the first order cascade transmission line 4.1 and 1/4 wavelength of the second level cascade transmission line 4.2 and are connected, the two it
Between connect 1/4 wavelength L-type open-circuit line 3.2 of the second level；1/4 wavelength of the second level cascades transmission line 4.2 and 1/4 wavelength of the third level cascades
Transmission line 4.3 is connected, and connects 1/4 wavelength L-type open-circuit line 3.3 of the third level therebetween；1/4 wavelength of the third level cascades transmission line
4.3 are connected with 1/4 wavelength of fourth stage cascade transmission line 4.4, connect 1/4 wavelength L-type open-circuit line 3.4 of the fourth stage therebetween, the
1/4 wavelength of level Four cascades transmission line 4.4 and is connected with 1/4 wavelength of level V cascade transmission line 4.5, connects level V 1/ therebetween
4 wavelength L-type open-circuit lines 3.5；1/4 wavelength of level V cascade transmission line 4.5 is connected with output port 2, connection the 6th therebetween
1/4 wavelength L-type open-circuit line 3.6 of grade.
As shown in Fig. 2, Fig. 2 (a) is the main view of shielding cavity, it is provided with shielding cavity cover board at the top of shielding cavity,
The quadrangle of shielding cavity is provided with cavity mounting hole 7, and screw hole 8 is provided on the side wall of shielding cavity, is used for fixed mask chamber
Body cover board is provided with punching anchor tip in the two sides of shielding cavity, respectively as input 9 and output 10, sets in shielding cavity
It is equipped with threaded hole 11, as the location hole for fixing microstrip circuit, is additionally provided with through-hole 12 in shielding cavity, is used as connection main chamber
Body, microstrip circuit, shielding cavity cover board location hole.Fig. 2 (b) is the left view of shielding cavity.
Shielding cavity is also divided into U-shaped structure, to improve shielding cavity in addition to closing shielding cavity by shielding cavity cover board
The resonance frequency of body reduces influence of the shielding cavity to microstrip circuit.
The main view of shielding cavity cover board, left view and front view are as shown in Figure 3.Connection shielding cavity is provided in through-hole 13
The countersunk head screw of body and shielding cavity cover board, shielding cavity cover board 14 pass through threaded hole 15 and countersunk head screw and microstrip circuit, screen
Cavity is covered to be connected.The height h of shielding cavity cover board 14 need to meet following relationship:
WhereinAir wavelength when for 1GHz.
Distance D of the open-circuit line 3 away from shielding cavity side wall1Following relationship need to be met:
D1≥3Wx (2)
Wherein, WxFor line width of opening a way.
The distance between cascaded transmission line 4 and shielding cavity cover board 14 D2Following relationship need to be met:
D2≥3Wy (3)
Wherein, Wy is the width of cascaded transmission line.
As it will be easily appreciated by one skilled in the art that the foregoing is merely illustrative of the preferred embodiments of the present invention, not to
The limitation present invention, any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should all include
Within protection scope of the present invention.
Claims (6)
1. a kind of bandstop filter applied to broadband receiver, including microstrip circuit and shielding cavity, microstrip circuit fixation is set
It sets in shielding cavity, which is characterized in that
Microstrip circuit includes input port, output port, 6 section of 1/4 wavelength L-type open-circuit line, 5 section of 1/4 wavelength cascade transmission line；
Input port is connected with 1/4 wavelength of first order cascade transmission line, connects 1/4 wavelength L-type open-circuit line of the first order therebetween；
1/4 wavelength of the first order cascades transmission line and is connected with 1/4 wavelength of second level cascade transmission line, connects the second level 1/ therebetween
4 wavelength L-type open-circuit lines；
1/4 wavelength of the second level cascades transmission line and is connected with 1/4 wavelength of third level cascade transmission line, connects the third level 1/ therebetween
4 wavelength L-type open-circuit lines；
1/4 wavelength of the third level cascades transmission line and is connected with 1/4 wavelength of fourth stage cascade transmission line, connects the fourth stage 1/ therebetween
4 wavelength L-type open-circuit lines；
1/4 wavelength of the fourth stage cascades transmission line and is connected with 1/4 wavelength of level V cascade transmission line, connects level V 1/ therebetween
4 wavelength L-type open-circuit lines；
1/4 wavelength of level V cascade transmission line is connected with output port, connects the 6th grade of 1/4 wavelength L-type open-circuit line therebetween；
Wherein, 1/4 wavelength of first order cascade transmission line and 1/4 wavelength of level V cascade transmission line are oppositely arranged, 1/4 wave of the second level
Long cascaded transmission line and 1/4 wavelength of fourth stage cascade transmission line are oppositely arranged；
Shielding cavity cover board is provided at the top of shielding cavity；Shielding cavity cover board is used to shielding cavity being divided into U-shaped structure；
The quadrangle of shielding cavity is provided with cavity mounting hole, is provided with screw hole on the side wall of shielding cavity, is used for fixed mask cavity
Cover board is provided with punching anchor tip in the two sides of shielding cavity, respectively as outputting and inputting.
2. bandstop filter according to claim 1, which is characterized in that the passband of the bandstop filter be 1GHz~
1.6GHz, 2.9GHz~6GHz, stopband are 1.7GHz~2.7GHz, and stopband inhibits to be greater than 40dBc.
3. bandstop filter according to claim 1 to 2, which is characterized in that the shielding cavity cover board is equipped with logical
Hole is provided with the countersunk head screw of connection shielding cavity and shielding cavity cover board in through-hole；The shielding cavity cover board is equipped with spiral shell
Pit, shielding cavity cover board are connected by threaded hole and countersunk head screw with microstrip circuit, shielding cavity.
4. bandstop filter according to claim 3, which is characterized in that the height h of shielding cavity cover board need to meet following
Relationship:
WhereinAir wavelength when for 1GHz.
5. bandstop filter according to claim 3, which is characterized in that distance D of the open-circuit line away from shielding cavity side wall1It needs
Meet following relationship:
D1≥3Wx (2)
Wherein, WxFor line width of opening a way.
6. bandstop filter according to claim 3, which is characterized in that cascaded transmission line and shielding cavity cover board (14) it
Between distance D2Following relationship need to be met:
D2≥3Wy (3)
Wherein, Wy is the width of cascaded transmission line.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610290656.0A CN105914433B (en) | 2016-05-05 | 2016-05-05 | A kind of bandstop filter applied to broadband receiver |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610290656.0A CN105914433B (en) | 2016-05-05 | 2016-05-05 | A kind of bandstop filter applied to broadband receiver |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN105914433A CN105914433A (en) | 2016-08-31 |
| CN105914433B true CN105914433B (en) | 2019-05-21 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201610290656.0A Active CN105914433B (en) | 2016-05-05 | 2016-05-05 | A kind of bandstop filter applied to broadband receiver |
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Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111033884B (en) * | 2018-08-09 | 2022-07-26 | 大富科技(安徽)股份有限公司 | Filter, duplexer and communication equipment |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101859921A (en) * | 2010-01-07 | 2010-10-13 | 东莞市苏普尔电子科技有限公司 | Microstrip broadband dual-frequency combining method and combiner |
| CN102623776A (en) * | 2012-03-20 | 2012-08-01 | 中国计量学院 | Coaxial cavity-based rejection filter |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101471470A (en) * | 2007-12-27 | 2009-07-01 | 奥雷通光通讯设备（上海）有限公司 | Band-stop filter |
| US8704618B2 (en) * | 2011-01-03 | 2014-04-22 | Valentine Research, Inc. | Microwave filter |
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2016
- 2016-05-05 CN CN201610290656.0A patent/CN105914433B/en active Active
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101859921A (en) * | 2010-01-07 | 2010-10-13 | 东莞市苏普尔电子科技有限公司 | Microstrip broadband dual-frequency combining method and combiner |
| CN102623776A (en) * | 2012-03-20 | 2012-08-01 | 中国计量学院 | Coaxial cavity-based rejection filter |
Non-Patent Citations (1)
| Title |
|---|
| 带阻滤波器设计研究;彭安尽;《中国优秀硕士学位论文全文数据库》;20130715;第26-30页 |
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Effective date of registration: 20201231 Address after: 430075 No. 42 Louyu East Road, Wuhan City, Hubei Province Patentee after: ARMY ENGINEERING University OF PLA Address before: 430000 Wuhan ordnance Sergeant school, 42 Luoyu East Road, Wuhan City, Hubei Province Patentee before: Chen Yuntao Patentee before: Wang Yi |