CN108808187A - Unilateral short circuit stub filter - Google Patents
Unilateral short circuit stub filter Download PDFInfo
- Publication number
- CN108808187A CN108808187A CN201810569229.5A CN201810569229A CN108808187A CN 108808187 A CN108808187 A CN 108808187A CN 201810569229 A CN201810569229 A CN 201810569229A CN 108808187 A CN108808187 A CN 108808187A
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- CN
- China
- Prior art keywords
- short branch
- transmission line
- short
- unilateral
- main transmission
- 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.)
- Pending
Links
- 230000005540 biological transmission Effects 0.000 claims abstract description 46
- 239000000463 material Substances 0.000 abstract description 2
- 238000010295 mobile communication Methods 0.000 abstract description 2
- 238000010586 diagram Methods 0.000 description 6
- 238000004891 communication Methods 0.000 description 3
- 238000002955 isolation Methods 0.000 description 2
- 238000003801 milling Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 230000005855 radiation Effects 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
Classifications
-
- 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)
- Control Of Motors That Do Not Use Commutators (AREA)
Abstract
The invention discloses a single-side short-circuit stub filter, which comprises an input end, an output end, at least one stage of main transmission line and at least two short-circuit stubs, wherein the main transmission line is communicated with the input end and the output end, and the short-circuit stubs are respectively communicated with the main transmission line at one end. The axis of each short-circuit branch section is along the X direction or the-X direction. Different short circuit branch sections are arranged on one side of each main transmission line along the Z direction. The short circuit branch section can be formed by two-stage or multi-stage short circuit branch section transmission lines in a communicated mode. The invention realizes various filters by using rectangular waveguide or single-ridge rectangular waveguide and short circuit branch section. Compared with the prior art, the invention has the advantages of compact structure, light weight, material saving and simple structure. The invention can be widely applied to radar, missile guidance and various mobile communication systems.
Description
Technical field
The present invention relates to a kind of microwave devices, specifically, being to be related to a kind of compact waveguide filter.
Background technology
Needed between any communication system, such as mobile communication system and the transceiver frequency channel of satellite communication system it is good every
From protecting the high sensitivity receiver front-ends not by powerful transmitting signal corruption.It is this isolation be typically by being located at receiver before
The hair at end hinders filter to complete.Common waveguide filter, including direct-coupled cavity waveguide filter, comb filter
Deng in order to realize high isolation need increase filter series, cause its length increase.Meanwhile in some special occasions, I
Need a kind of bandpass filter of more passbands and a kind of bandstop filter of more stopbands.Such filter there is no ripe design
Method.
Invention content
The purpose of the present invention is to provide a kind of compact unilateral side short branch filters, greatly shorten the length of filter
Degree.
To achieve the goals above, the technical solution adopted by the present invention is：
A kind of unilateral side short branch filter, including input terminal, output end are connected at least level-one master of input terminal and output end
The short branch that transmission line and at least two difference are connected to main transmission line at one end；The axis of each short branch is in X direction
Or -X direction；Different short branch are arranged along Z-direction；XYZ form right angle coordinate systems.
In order to improve matching state of the filter in passband, we use following three steps：
The first step, at least level-one main transmission line be internally provided with only in one direction with the main transmission line inner wall at place
Connected metallic object.Under normal conditions, it is round or rectangle column that this metallic object, which is cross section,.
Second step, at least one short branch are made of the connection of at least two-stage short branch transmission line.Outermost short circuit branch
The outer end of section transmission line is typically provided to open circuit or short circuit, but is preferred with short circuit, to reduce device to extraneous radiation.
Third walk, at least level-one short branch transmission line be internally provided with only in one direction with the short branch at place
The connected metallic object B of transmission line inner wall.
In order to further reduce the volume of device, all short branch are arranged in all main transmission lines along Z-direction
Side.
The unilateral side short branch filter can be bandpass filter.The bandpass filter can have there are two passband
Or at least three passband, become more passband bandpass filters.
The unilateral side short branch filter can be bandstop filter.The bandstop filter can have there are two stopband
Or at least three stopband, become more stopband bandstop filters.
At this moment, the total length of at least one short branch is more than the corresponding free space wavelength of highest frequency of minimum passband
0.7 times.
A kind of optimal design, the main transmission line are rectangular waveguide.
Moreover, width of the main transmission line on direction is less than its height in the Y direction.
In order to expand the low-limit frequency from minimum passband of filter to the total bandwidth the highest frequency of highest passband,
The input terminal and output end of passband are single ridge rectangular waveguide.
Preferably design, short branch transmission line are rectangular waveguide.
The present invention realizes various filters, including low pass, height using rectangular waveguide or single ridge rectangular waveguide and short branch
Logical, band logical, band resistance, multichannel band logical and more stopband bandstop filters.Compared with the prior art, the present invention has compact-sized,
It is light-weight, save material and advantage simple in structure.
Description of the drawings
Fig. 1 is the schematic diagram of the present invention and its embodiment 1.
Fig. 2 is the schematic diagram of embodiment 2 of the present invention.
Fig. 3 is the schematic diagram of embodiment 3 of the present invention.
Fig. 4 is the schematic diagram of embodiment 4 of the present invention.
Fig. 5 is the transmission curve of embodiment 4 of the present invention.
Fig. 6 is the schematic diagram of embodiment 5 of the present invention.
Fig. 7 is the transmission curve of embodiment 5 of the present invention.
Fig. 8 is the schematic diagram of embodiment 6 of the present invention.
Fig. 9 is the transmission curve of embodiment 6 of the present invention.
In figure marked as：1, input terminal；2, output end；3, main transmission line；31- metallic objects；4, short branch transmits
Line；41- metallic objects B.
Specific implementation mode
The present invention is described in further detail with reference to embodiment.
Embodiment 1
As shown in Figure 1.A kind of unilateral side short branch filter, including input terminal 1, output end 2 are connected to input terminal 1 and output
The short branch that 10 grades of main transmission lines 3 at end 2 and 8 difference are connected to main transmission line 3 at one end；The axis of each short branch
In X direction or -X direction；Different short branch are arranged along Z-direction.
It is internally provided in 3 grades of main transmission lines 3 and is only in one direction connected with the main transmission line inner wall at place
Metallic object 31.
16 short branch are all made of the connection of two-stage short branch transmission line 4.Outside outermost short branch transmission line
End is typically provided to short circuit.
Every grade of grade short branch transmission line 4 be internally provided with only in one direction with the short branch transmission line 4 at place
The connected metallic object B41 of inner wall.
All short branch are arranged in the normals of all main transmission lines 3 along Z-direction respectively along-X ,-Y, X, Y's
On four sides.
The main transmission line 3 is rectangular waveguide.Moreover, width of the main transmission line 3 on direction is less than it in the Y direction
On height.
Short branch transmission line 4 is rectangular waveguide.
Embodiment 2
As shown in Figure 2.Compared with embodiment 1, difference place is only that, is not provided with any axis along Y-direction or -Y direction
Short branch.
Embodiment 3
As shown in Figure 3.Compared with embodiment 2, difference place is only that, is provided with 6 short branch.All short branch
It is all disposed within the side in X direction of main transmission line 3.It is not provided with any metallic object 31 or metallic object A41.
Embodiment 4
As shown in Figures 4 and 5.This embodiment is the specific implementation as high-pass filter of embodiment 3.Difference also exists
In the filter shares 15 short branch.For the ease of being processed using milling mode, the short-circuit end of each short branch is led
Circle.Fig. 5 gives the S21 curves of the filter.
Embodiment 5
As shown in Figures 6 and 7.This embodiment is the specific implementation as low-pass filter of embodiment 3.Difference also exists
In the filter shares 13 short branch.For the ease of being processed using milling mode, the short-circuit end of each short branch is led
Circle.Fig. 7 gives the S21 curves of the filter.
Embodiment 6
As shown in FIG. 8 and 9.This embodiment is the specific implementation as multi-channel filter of embodiment 3.Difference is only
It is, input terminal and output end are all single ridged waveguides.A rectangular metal body is all respectively provided with inside 5 grades of main transmission lines.
The total length of all 6 short branch is both greater than 0.7 times of the corresponding free space wavelength of highest frequency of minimum passband.Fig. 9
Give the S21 curves of the filter.From fig. 9, it can be seen that the filter has 4 channels.Using multistage cross section difference
Main transmission line 3, and multistage short branch transmission line 4 constitutes each short branch, passes through careful design, it is expected to be managed
The four-way bandpass filter thought.
The present invention may be constructed various waveguide filters, be received in various communications and Military Electronics system for protecting
The out-of-band noise of machine or curb transmitter.
Claims (10)
1. a kind of unilateral side short branch filter, which is characterized in that input terminal（1）, output end（2）, it is connected to input terminal（1）With
Output end（2）At least level-one main transmission line（3）And at least two respectively at one end with main transmission line（3）The short circuit branch of connection
Section；The axis of each short branch is in X direction or -X direction；Different short branch are arranged along Z-direction；XYZ form right angle coordinate systems；
All short branch are arranged in all main transmission lines along Z-direction（3）Side.
2. a kind of unilateral short branch filter according to claim 1, which is characterized in that in the main biography of at least level-one
Defeated line（3）It is internally provided with the metallic object being only connected in one direction with the main transmission line inner wall at place（31）.
3. a kind of unilateral short branch filter according to claim 1, which is characterized in that at least one short branch by
At least two-stage short branch transmission line（4）Connection is constituted.
4. a kind of unilateral short branch filter according to claim 1, which is characterized in that at least level-one short branch passes
Defeated line（4）Be internally provided with only in one direction with the short branch transmission line at place（4）The connected metallic object B of inner wall
（41）.
5. a kind of unilateral short branch filter according to claim 1, which is characterized in that the unilateral side short branch filter
Mirror symmetry above and below wave device.
6. a kind of unilateral short branch filter according to claim 1, which is characterized in that at least one short branch
Total length is more than 0.7 times of the corresponding free space wavelength of highest frequency of minimum passband.
7. a kind of unilateral short branch filter according to claim 1, which is characterized in that the main transmission line（3）For
Rectangular waveguide.
8. a kind of unilateral short branch filter according to claim 7, which is characterized in that the main transmission line（3）In X
Width on direction is less than its height in the Y direction.
9. a kind of unilateral short branch filter according to claim 1, which is characterized in that input terminal（1）And output end
（2）It is single ridge rectangular waveguide.
10. a kind of unilateral short branch filter according to claim 1, which is characterized in that short branch transmission line（4）
For rectangular waveguide.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810569229.5A CN108808187A (en) | 2018-06-05 | 2018-06-05 | Unilateral short circuit stub filter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810569229.5A CN108808187A (en) | 2018-06-05 | 2018-06-05 | Unilateral short circuit stub filter |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN108808187A true CN108808187A (en) | 2018-11-13 |
Family
ID=64088570
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810569229.5A Pending CN108808187A (en) | 2018-06-05 | 2018-06-05 | Unilateral short circuit stub filter |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN108808187A (en) |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1004149A1 (en) * | 1997-08-21 | 2000-05-31 | Robert Bosch Gmbh | Waveguide filter |
| US20110102111A1 (en) * | 2009-10-29 | 2011-05-05 | Hon Hai Precision Industry Co., Ltd. | Band-pass filter circuit with transmission lines |
| CN103311611A (en) * | 2012-03-15 | 2013-09-18 | 成都赛纳赛德科技有限公司 | Ultra wide band filter based on short circuit branches |
| CN103311612A (en) * | 2012-03-15 | 2013-09-18 | 成都赛纳赛德科技有限公司 | Strip-line high-pass filter |
| CN104882652A (en) * | 2015-06-12 | 2015-09-02 | 四川迈格酷科技有限公司 | Ultra-wide-band terahertz wave filter |
-
2018
- 2018-06-05 CN CN201810569229.5A patent/CN108808187A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1004149A1 (en) * | 1997-08-21 | 2000-05-31 | Robert Bosch Gmbh | Waveguide filter |
| US20110102111A1 (en) * | 2009-10-29 | 2011-05-05 | Hon Hai Precision Industry Co., Ltd. | Band-pass filter circuit with transmission lines |
| CN103311611A (en) * | 2012-03-15 | 2013-09-18 | 成都赛纳赛德科技有限公司 | Ultra wide band filter based on short circuit branches |
| CN103311612A (en) * | 2012-03-15 | 2013-09-18 | 成都赛纳赛德科技有限公司 | Strip-line high-pass filter |
| CN104882652A (en) * | 2015-06-12 | 2015-09-02 | 四川迈格酷科技有限公司 | Ultra-wide-band terahertz wave filter |
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| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
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| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20181113 |
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| WD01 | Invention patent application deemed withdrawn after publication |