CN110571502A - Adjustable filter - Google Patents
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- CN110571502A CN110571502A CN201910801791.0A CN201910801791A CN110571502A CN 110571502 A CN110571502 A CN 110571502A CN 201910801791 A CN201910801791 A CN 201910801791A CN 110571502 A CN110571502 A CN 110571502A
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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
- H01P1/207—Hollow waveguide filters
- H01P1/208—Cascaded cavities; Cascaded resonators inside a hollow waveguide structure
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Abstract
The invention provides an adjustable filter which comprises a shell, a partition plate, a feed structure and a pipe body, wherein the shell is hollow, the partition plate is arranged in the shell and fixedly connected with the shell, the partition plate divides the shell into a first resonant cavity, a second resonant cavity and a third cavity, the first resonant cavity and the second resonant cavity are symmetrically arranged, the third cavity is arranged on one side of the first resonant cavity and one side of the second resonant cavity, the feed structure is arranged in the third cavity, a first opening is formed in the partition plate between the first resonant cavity and the second resonant cavity, and second openings are respectively formed in the partition plates between the first resonant cavity and the third cavity and between the second resonant cavity and the third cavity. The tube body has five, and five tube bodies set up respectively in first resonant cavity, second resonant cavity, first opening and two second openings, and tube body bottom and casing bottom surface fixed connection, and the top of tube body stretches out the casing top surface, is equipped with the solution in the tube body. The adjustable range of the adjustable filter is improved by adjusting the volume of the solution in the five tube bodies.
Description
Technical Field
The present invention relates to a filter, and more particularly, to a tunable filter.
Background
A microwave filter is a device for separating different microwave frequencies, which can suppress unwanted frequency signals and pass only wanted frequency signals, and plays a very important role in a transmitting end and a receiving end of a communication system. With the development of communication technology, tunable filters capable of covering multiple ranges and multiple frequency bands are favored by people, but the existing tunable filters have the problems of not wide tunable range and large insertion loss.
Disclosure of Invention
The technical problem to be solved by the invention is as follows: how to increase the tunable range of the tunable filter and reduce the loss.
In order to solve the technical problems, the invention adopts the technical scheme that:
The invention provides an adjustable filter, which comprises a shell, a partition plate, a feed structure and a tube body, wherein the shell is provided with a plurality of through holes;
The feeding structure is arranged in the third cavity, a first opening is formed in the partition plate between the first resonant cavity and the second resonant cavity, and second openings are formed in the partition plates between the first resonant cavity and the third resonant cavity and between the second resonant cavity and the third cavity respectively;
the number of the tube bodies is five, the five tube bodies are respectively arranged in the first resonant cavity, the second resonant cavity, the first opening and the two second openings, the bottom ends of the five tube bodies are fixedly connected with the bottom surface of the shell, the top ends of the five tube bodies extend out of the top surface of the shell, and solution is arranged in the five tube bodies.
Furthermore, the five tube bodies include two first tube bodies, a second tube body and two third tube bodies, the two first tube bodies are respectively located in the first resonant cavity and the second resonant cavity, the second tube body is located in the first opening, and the two third tube bodies are respectively located in the two second openings.
Furthermore, the two first tube bodies are respectively positioned in the middle of the first resonant cavity and the second resonant cavity, and the second tube body and the two first tube bodies are arranged in a collinear manner.
Further, the solution is distilled water.
furthermore, two mounting holes are formed in the bottom surface of the shell, and the two mounting holes are located in the third cavity.
Furthermore, the feed structure comprises two probes, and the two probes are respectively and fixedly connected in the two mounting holes.
Further, the probe is a differential probe.
Furthermore, the shell and the partition plate are made of metal materials, and the pipe body is made of plastic.
the invention has the beneficial effects that: the dielectric constant of the solution in the tube bodies arranged in the first resonant cavity and the second resonant cavity is greater than the relative dielectric constant of air, at the moment, the equivalent wavelength is lengthened, the frequency is lowered, and the movement of the frequency can be controlled by changing the volumes of the solution in the tube bodies arranged in the first resonant cavity and the second resonant cavity; the solution in the tube body arranged in the first opening plays a coupling role, namely the effect of blocking energy from entering the second resonant cavity from the first resonant cavity, and the coupling coefficient, namely the energy entering the second resonant cavity can be changed by changing the volume of the solution in the tube body arranged in the first opening; the two solutions in the tube bodies arranged in the second opening respectively play roles of preventing energy from entering the first resonant cavity and outputting the energy from the second resonant cavity, and the size of an external Q value can be controlled by changing the volume of the two solutions in the tube bodies arranged in the second opening, namely the amount of the energy entering the first resonant cavity is controlled. In order to avoid the influence caused by the change of the external Q value and the coupling coefficient when the frequency is changed, the external Q value and the coupling coefficient can be manually controlled while the frequency is changed, namely, the volumes of the solution in the two pipes arranged in the first resonant cavity and the second resonant cavity are changed, and the volumes of the solution in the two pipes arranged in the second opening and the pipe arranged in the first opening are manually changed to obtain the required performance, so that the adjustable range of the filter is improved.
Drawings
The detailed structure of the invention is described in detail below with reference to the accompanying drawings
FIG. 1 is a perspective view of the tunable filter of the present invention with the top surface of the housing removed;
FIG. 2 is another side perspective view of the tunable filter of the present invention with the top surface of the housing removed;
FIG. 3 is a bottom side perspective view of the tunable filter housing of the present invention;
Fig. 4 is a perspective view of the tunable filter of the present invention.
In fig. 1, 2, 3 and 4:
100-shell, 200-tube, 300-feed structure, 101-first resonant cavity, 102-second resonant cavity, 103-third cavity, 301-feed probe A, 302-feed probe B, 001-partition plate, 201-first tube, 202-second tube, 203-third tube, 002-first opening, 003-second opening, 004-solution, 005-mounting hole
Detailed Description
in order to explain technical contents, structural features, and objects and effects of the present invention in detail, the following detailed description is given with reference to the accompanying drawings in conjunction with the embodiments.
Referring to fig. 1, 2, 3 and 4, the present invention provides a tunable filter, which includes a housing 100, a partition 001, a feeding structure 300 and a plurality of tubes 200, wherein the housing 100 is hollow, the partition 001 is disposed in the hollow of the housing 100 and is fixedly connected to the housing 100, the partition 001 divides the housing 100 into a first resonant cavity 101, a second resonant cavity 102 and a third cavity 103, the first resonant cavity 101 and the second resonant cavity 102 are symmetrically disposed, the third cavity 103 is disposed at one side of the first resonant cavity 101 and the second resonant cavity 102, the feeding structure 300 is disposed in the third cavity 103, the partition 001 between the first resonant cavity 101 and the second resonant cavity 102 is provided with a first opening 002, and the partition 001 between the first resonant cavity 101 and the third cavity 103 and between the second resonant cavity 102 and the third cavity 103 is provided with a second opening 003. The tube 200 includes five tubes 200, the five tubes 200 are respectively disposed in the first resonant cavity 101, the second resonant cavity 102, the first opening 002 and the two second openings 003, bottom ends of the five tubes 200 are fixedly connected to a bottom surface of the housing 100, top ends of the five tubes 200 extend out of a top surface of the housing 100, and a solution 004 is disposed in the five tubes 200.
it should be noted that the number of the first resonant cavities 101 is equal to the number of the second resonant cavities 102, and the total number of the first resonant cavities 101 and the second resonant cavities 102 is not limited to two, that is, the total number of the first resonant cavities 101 and the second resonant cavities 102 is 2n, where n is a natural number greater than 1. In addition, each additional first cavity 101 and second cavity 102 has a corresponding additional first opening 002 and three tubes 200.
it should be further noted that the second openings 003 are respectively opened on the partition 001 between two adjacent first resonators 101 and the partition 001 between two adjacent second resonators 102.
In the actual working process, energy passes through the feeding structure 300 and enters the first resonant cavity 101 through the second opening 003 between the first resonant cavity 101 and the third cavity 103 and the tube 200 arranged in the second opening 003, and at this time, the energy entering the first resonant cavity 101 can be controlled by changing the volume of the solution 004 in the tube 200 arranged in the second opening 003, that is, the external Q value is controlled; after energy enters the first resonant cavity 101, the movement of frequency can be controlled by changing the volume of the solution 004 in the tube 200 in the first resonant cavity 101; then, the energy enters the second resonant cavity 102 through the first opening 002 and the tube 200 disposed in the first opening 002, and at this time, the amount of the energy entering the second resonant cavity 102 can be controlled by changing the volume of the solution 004 in the tube 200 disposed in the first opening 002, that is, the coupling coefficient is controlled; after energy enters the second resonant cavity 102, the movement of the frequency can be controlled by changing the volume of the solution 004 in the tube 200 in the second resonant cavity 102; finally, the energy is output through the feeding structure 300 via the second opening 003 between the second cavity 102 and the third cavity 103 and the tube 200 disposed in the second opening 003.
Preferably, the first resonant cavity 101 and the second resonant cavity 102 are identical square cavities, and the third resonant cavity 103 is a rectangular cavity.
Preferably, the baffle 001 is a "T" shaped plate.
Preferably, the first opening 002 and the two second openings 003 are rectangular openings.
From the above description, the beneficial effects of the present invention are: the dielectric constant of the solution in the tube bodies arranged in the first resonant cavity and the second resonant cavity is greater than the relative dielectric constant of air, at the moment, the equivalent wavelength is lengthened, the frequency is lowered, and the movement of the frequency can be controlled by changing the volumes of the solution in the tube bodies arranged in the first resonant cavity and the second resonant cavity; the solution in the tube body arranged in the first opening plays a coupling role, namely the effect of blocking energy from entering the second resonant cavity from the first resonant cavity, and the coupling coefficient, namely the energy entering the second resonant cavity can be changed by changing the volume of the solution in the tube body arranged in the first opening; the two solutions in the tube bodies arranged in the second opening respectively play roles of preventing energy from entering the first resonant cavity and outputting the energy from the second resonant cavity, and the size of an external Q value can be controlled by changing the volume of the two solutions in the tube bodies arranged in the second opening, namely the amount of the energy entering the first resonant cavity is controlled. When the frequency is changed, the external Q value and the coupling coefficient are changed to a greater or lesser extent, too high external Q value results in very little accessible energy, too low coupling coefficient also results in insufficient accessible energy, and the performance of the passband is not ideal. In order to avoid the influence caused by the change of the external Q value and the coupling coefficient, the external Q value and the coupling coefficient can be manually controlled while the frequency is changed, namely, the volumes of the solution in the two pipe bodies arranged in the first resonant cavity and the second resonant cavity are changed, and the volumes of the solution in the two pipe bodies arranged in the second opening and the solution in the pipe body arranged in the first opening are manually changed to obtain the required performance, so that the adjustable range of the filter is improved.
Example 1
In a specific embodiment, the tunable filter includes a housing 100, a partition 001, a feeding structure 300, and a plurality of tubes 200, wherein the housing 100 is hollow, the partition 001 is disposed in the hollow of the housing 100 and is fixedly connected to the housing 100, the partition 001 divides the housing 100 into a first resonant cavity 101, a second resonant cavity 102, and a third cavity 103, the first resonant cavity 101 and the second resonant cavity 102 are symmetrically disposed, the third cavity 103 is disposed at one side of the first resonant cavity 101 and the second resonant cavity 102, the feeding structure 300 is disposed in the third cavity 103, the partition 001 between the first resonant cavity 101 and the second resonant cavity 102 is provided with a first opening 002, and the partitions 001 between the first resonant cavity 101 and the third cavity 103 and between the second resonant cavity 102 and the third cavity 103 are respectively provided with a second opening 003. The tube 200 includes five tubes 200, the five tubes 200 are respectively disposed in the first resonant cavity 101, the second resonant cavity 102, the first opening 002 and the two second openings 003, bottom ends of the five tubes 200 are fixedly connected to a bottom surface of the housing 100, top ends of the five tubes 200 extend out of a top surface of the housing 100, and a solution 004 is disposed in the five tubes 200. Specifically, the five tubes 200 include two first tubes 201, a second tube 202 and two third tubes 203, the two first tubes 201 are respectively disposed in the first resonant cavity 101 and the second resonant cavity 102, the second tube 202 is located in the first opening 002, and the two third tubes 203 are respectively located in the two second openings 003. It should be noted that the two first tubes 201 are respectively located in the middle of the first resonant cavity 101 and the second resonant cavity 102, and the second tube 202 is collinear with the two first tubes 201.
in this embodiment, the fields formed in the first resonant cavity 101 and the second resonant cavity 102 are strongest at the middle portion thereof, and the two first tubes 201 are respectively disposed in the first resonant cavity 101 and the second resonant cavity 102 at the middle portion thereof, so that a wide frequency range can be moved by changing the volume of the solution 004 in the two first tubes 201. In addition, the solution 004 in the second tubular body 202 plays a coupling role, namely, the role of blocking energy from entering the second resonant cavity 102 from the first resonant cavity 101 is that the second tubular body 202 and the two first tubular bodies 201 are arranged in a collinear way, which is beneficial to changing the coupling coefficient.
Example 2
in a specific embodiment, the tunable filter includes a housing 100, a partition 001, a feeding structure 300, and a plurality of tubes 200, wherein the housing 100 is hollow, the partition 001 is disposed in the hollow of the housing 100 and is fixedly connected to the housing 100, the partition 001 divides the housing 100 into a first resonant cavity 101, a second resonant cavity 102, and a third cavity 103, the first resonant cavity 101 and the second resonant cavity 102 are symmetrically disposed, the third cavity 103 is disposed at one side of the first resonant cavity 101 and the second resonant cavity 102, the feeding structure 300 is disposed in the third cavity 103, the partition 001 between the first resonant cavity 101 and the second resonant cavity 102 is provided with a first opening 002, and the partitions 001 between the first resonant cavity 101 and the third cavity 103 and between the second resonant cavity 102 and the third cavity 103 are respectively provided with a second opening 003. The tube 200 includes five tubes 200, the five tubes 200 are respectively disposed in the first resonant cavity 101, the second resonant cavity 102, the first opening 002 and the two second openings 003, bottom ends of the five tubes 200 are fixedly connected to a bottom surface of the housing 100, top ends of the five tubes 200 extend out of a top surface of the housing 100, and a solution 004 is disposed in the five tubes 200. Specifically, solution 004 is distilled water.
In this embodiment, the solution 004 disposed in the tube 200 is distilled water, which can reduce energy loss.
Example 3
In a specific embodiment, the tunable filter includes a housing 100, a partition 001, a feeding structure 300, and a plurality of tubes 200, wherein the housing 100 is hollow, the partition 001 is disposed in the hollow of the housing 100 and is fixedly connected to the housing 100, the partition 001 divides the housing 100 into a first resonant cavity 101, a second resonant cavity 102, and a third cavity 103, the first resonant cavity 101 and the second resonant cavity 102 are symmetrically disposed, the third cavity 103 is disposed at one side of the first resonant cavity 101 and the second resonant cavity 102, the feeding structure 300 is disposed in the third cavity 103, the partition 001 between the first resonant cavity 101 and the second resonant cavity 102 is provided with a first opening 002, and the partitions 001 between the first resonant cavity 101 and the third cavity 103 and between the second resonant cavity 102 and the third cavity 103 are respectively provided with a second opening 003. The tube 200 includes five tubes 200, the five tubes 200 are respectively disposed in the first resonant cavity 101, the second resonant cavity 102, the first opening 002 and the two second openings 003, bottom ends of the five tubes 200 are fixedly connected to a bottom surface of the housing 100, top ends of the five tubes 200 extend out of a top surface of the housing 100, and a solution 004 is disposed in the five tubes 200. Specifically, two mounting holes 005 are formed in the bottom surface of the housing 100, and the two mounting holes 005 are located in the third cavity 103. The feeding structure 300 includes two probes (a feeding probe a301 and a feeding probe B302), the two probes are respectively and fixedly connected in the two mounting holes 005, and the two probes are differential probes.
Preferably, the two probes are disposed in the third cavity 103 and are respectively collinear with the two third tubes 203 and the two first tubes 201, so that when energy enters the first resonant cavity 101 or the second resonant cavity 102, the volume of the solution 004 in the third tube 203 in the second opening 003 is changed, and the external Q value is controlled.
In this embodiment, two probes (feed probe a301 and feed probe B302) are used for input and output of energy.
Note that either one of the two probes (feed probe a301 and feed probe B302) may be used as an input or an output.
Example 4
in a specific embodiment, the tunable filter includes a housing 100, a partition 001, a feeding structure 300, and a plurality of tubes 200, wherein the housing 100 is hollow, the partition 001 is disposed in the hollow of the housing 100 and is fixedly connected to the housing 100, the partition 001 divides the housing 100 into a first resonant cavity 101, a second resonant cavity 102, and a third cavity 103, the first resonant cavity 101 and the second resonant cavity 102 are symmetrically disposed, the third cavity 103 is disposed at one side of the first resonant cavity 101 and the second resonant cavity 102, the feeding structure 300 is disposed in the third cavity 103, the partition 001 between the first resonant cavity 101 and the second resonant cavity 102 is provided with a first opening 002, and the partitions 001 between the first resonant cavity 101 and the third cavity 103 and between the second resonant cavity 102 and the third cavity 103 are respectively provided with a second opening 003. The tube 200 includes five tubes 200, the five tubes 200 are respectively disposed in the first resonant cavity 101, the second resonant cavity 102, the first opening 002 and the two second openings 003, bottom ends of the five tubes 200 are fixedly connected to a bottom surface of the housing 100, top ends of the five tubes 200 extend out of a top surface of the housing 100, and a solution 004 is disposed in the five tubes 200. Specifically, the casing 100 and the partition 001 are made of metal, and the tube 200 is made of plastic.
In this embodiment, the casing 100 and the partition 001 are made of metal materials, so that energy leakage can be effectively prevented. In addition, the material of the tube body 200 is plastic, which can effectively reduce energy loss.
In summary, the tunable filter provided by the present invention has the following beneficial effects: the dielectric constant of the solution in the two first pipe bodies is larger than the relative dielectric constant of air, the equivalent wavelength is lengthened, the frequency is lowered, and the movement of the frequency can be controlled by changing the volume of the solution in the two first pipe bodies; the solution in the second tube body plays a coupling role, namely, the effect of blocking energy from entering the second resonant cavity from the first resonant cavity can be achieved, and the coupling coefficient can be changed by changing the volume of the solution in the second tube body, namely, the quantity of the energy entering the second resonant cavity can be changed; the solutions in the two third tube bodies respectively play roles of preventing energy from entering the first resonant cavity and outputting the energy from the second resonant cavity, and the size of an external Q value can be controlled by changing the volume of the solutions in the two third tube bodies, namely the amount of the energy entering the first resonant cavity is controlled. When the frequency is changed, the external Q value and the coupling coefficient are changed to a greater or lesser extent, too high external Q value results in very little accessible energy, too low coupling coefficient also results in insufficient accessible energy, and the performance of the passband is not ideal. In order to avoid the influence caused by the change of the external Q value and the coupling coefficient, the external Q value and the coupling coefficient can be manually controlled while the frequency is changed, namely, the volumes of the solutions in the third tube body and the second tube body are manually changed while the volumes of the solutions in the two first tube bodies are changed to obtain the required performance, and the adjustable range of the filter is improved. The two first tube bodies are respectively arranged in the first resonant cavity and the second resonant cavity and are positioned in the middle, and at the moment, the wide frequency range can be moved by only changing the volume of the solution in the two first tube bodies. The second tube body and the two first tube bodies are arranged in a collinear manner, so that the coupling coefficient can be changed. The solution arranged in the tube body is distilled water, so that energy loss can be reduced. The two probes are used for inputting and outputting energy, the two probes are arranged in the third cavity and are respectively arranged in a collinear way with the two third tube bodies and the two first tube bodies, and when the energy enters the first resonant cavity or the second resonant cavity, the size of an external Q value is controlled by changing the volume of solution in the third tube body positioned in the second opening. The shell and the partition plate are made of metal materials, so that energy leakage can be effectively prevented, and the tube body is made of plastic, so that energy loss can be effectively reduced.
The first … … and the second … … are only used for name differentiation and do not represent how different the importance and position of the two are.
Here, the upper, lower, left, right, front, and rear merely represent relative positions thereof and do not represent absolute positions thereof
The above description is only an embodiment of the present invention, and not intended to limit the scope of the present invention, and all modifications of equivalent structures and equivalent processes performed by the present specification and drawings, or directly or indirectly applied to other related technical fields, are included in the scope of the present invention.
Claims (8)
1. A tunable filter, comprising: the feed structure comprises a shell, a partition plate, a feed structure and a pipe body;
The feeding structure is arranged in the third cavity, a first opening is formed in the partition plate between the first resonant cavity and the second resonant cavity, and second openings are formed in the partition plates between the first resonant cavity and the third resonant cavity and between the second resonant cavity and the third cavity respectively;
The number of the tube bodies is five, the five tube bodies are respectively arranged in the first resonant cavity, the second resonant cavity, the first opening and the two second openings, the bottom ends of the five tube bodies are fixedly connected with the bottom surface of the shell, the top ends of the five tube bodies extend out of the top surface of the shell, and solution is arranged in the five tube bodies.
2. A tunable filter according to claim 1, wherein five of the bodies comprise: the two first tube bodies are respectively positioned in the first resonant cavity and the second resonant cavity, the second tube body is positioned in the first opening, and the two third tube bodies are respectively positioned in the two second openings.
3. A tunable filter as claimed in claim 2, wherein: the two first tube bodies are respectively positioned in the middle of the first resonant cavity and the second resonant cavity, and the second tube body and the two first tube bodies are arranged in a collinear manner.
4. A tunable filter as defined in claim 1, wherein: the solution is distilled water.
5. A tunable filter as defined in claim 1, wherein: two mounting holes are formed in the bottom surface of the shell, and the two mounting holes are located in the third cavity.
6. The tunable filter of claim 5, wherein the feed structure comprises: and the two probes are respectively and fixedly connected in the two mounting holes.
7. A tunable filter as defined in claim 6, wherein: the probe is a differential probe.
8. A tunable filter as defined in claim 1, wherein: the shell and the partition plate are made of metal materials, and the pipe body is made of plastic.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910801791.0A CN110571502B (en) | 2019-08-28 | 2019-08-28 | Adjustable filter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910801791.0A CN110571502B (en) | 2019-08-28 | 2019-08-28 | Adjustable filter |
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| Publication Number | Publication Date |
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| CN110571502A true CN110571502A (en) | 2019-12-13 |
| CN110571502B CN110571502B (en) | 2021-02-19 |
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| CN201910801791.0A Active CN110571502B (en) | 2019-08-28 | 2019-08-28 | Adjustable filter |
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| WO2001035485A1 (en) * | 1999-11-12 | 2001-05-17 | Trilithic, Inc. | Improvements in cavity filters |
| WO2004093108A2 (en) * | 2003-04-08 | 2004-10-28 | Harris Corporation | Maintenance of fluidic dielectrics in rf devices |
| US6876278B2 (en) * | 2003-04-23 | 2005-04-05 | Harris Corporation | Tunable resonant cavity |
| CN201562744U (en) * | 2009-05-19 | 2010-08-25 | 武汉凡谷电子技术股份有限公司 | Adjustable filter |
| CN104270116A (en) * | 2014-09-16 | 2015-01-07 | 张家港保税区灿勤科技有限公司 | Tuning screw, manufacturing technology thereof and L-waveband LC tunable filter with tuning screw |
| CN108963399A (en) * | 2018-06-26 | 2018-12-07 | 浙江大学 | A kind of novel tunable high power cavity body filter |
-
2019
- 2019-08-28 CN CN201910801791.0A patent/CN110571502B/en active Active
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|---|---|---|---|---|
| WO2001035485A1 (en) * | 1999-11-12 | 2001-05-17 | Trilithic, Inc. | Improvements in cavity filters |
| WO2004093108A2 (en) * | 2003-04-08 | 2004-10-28 | Harris Corporation | Maintenance of fluidic dielectrics in rf devices |
| US6876278B2 (en) * | 2003-04-23 | 2005-04-05 | Harris Corporation | Tunable resonant cavity |
| CN201562744U (en) * | 2009-05-19 | 2010-08-25 | 武汉凡谷电子技术股份有限公司 | Adjustable filter |
| CN104270116A (en) * | 2014-09-16 | 2015-01-07 | 张家港保税区灿勤科技有限公司 | Tuning screw, manufacturing technology thereof and L-waveband LC tunable filter with tuning screw |
| CN108963399A (en) * | 2018-06-26 | 2018-12-07 | 浙江大学 | A kind of novel tunable high power cavity body filter |
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| Title |
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| SARAH N. MCCLUNG等: "Band-Reconfigurable Filter With Liquid Metal Actuation", 《IEEE TRANSACTIONS ON MICROWAVE THEORY AND TECHNIQUES》 * |
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