CN109256609B - Non-contact type frequency automatic adjusting and detecting filter with leakage-proof cavity - Google Patents
Non-contact type frequency automatic adjusting and detecting filter with leakage-proof cavity Download PDFInfo
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- CN109256609B CN109256609B CN201710568168.6A CN201710568168A CN109256609B CN 109256609 B CN109256609 B CN 109256609B CN 201710568168 A CN201710568168 A CN 201710568168A CN 109256609 B CN109256609 B CN 109256609B
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- 238000003780 insertion Methods 0.000 claims description 10
- 230000037431 insertion Effects 0.000 claims description 10
- 230000000149 penetrating effect Effects 0.000 claims description 5
- 238000004891 communication Methods 0.000 claims description 2
- 230000002265 prevention Effects 0.000 claims 8
- 238000006073 displacement reaction Methods 0.000 abstract 1
- 230000033001 locomotion Effects 0.000 description 6
- 238000000034 method Methods 0.000 description 5
- 230000005540 biological transmission Effects 0.000 description 4
- 238000013461 design Methods 0.000 description 4
- 125000006850 spacer group Chemical group 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 238000010146 3D printing Methods 0.000 description 1
- 230000001154 acute effect Effects 0.000 description 1
- 230000001788 irregular Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
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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
-
- 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 a non-contact type frequency automatic debugging and measuring filter with a leakage-proof cavity, which comprises a first cavity, a moving part and a second cavity, wherein the first cavity is provided with a first shell and a first opening on the first shell, the second cavity is provided with a second shell, a first cavity in the second shell, a second opening and a third opening which penetrate through the second shell, the moving part is inserted into the first cavity from the third opening or is inserted between the third opening and the first cavity from the third opening, the second opening is adjacent to the moving part and forms a part of the cavity, the second shell is provided with a spacing part adjacent to the moving part to separate the moving part from the cavity, and the first shell and the second shell are not in contact with the moving part. The invention can solve the problems of unstable leakage electromagnetic wave and frequency displacement when the central frequency and the bandwidth are adjusted.
Description
Technical Field
The invention relates to the technical field of automatic tuning filters, in particular to a non-contact type frequency automatic tuning filter with a leakage-proof cavity, which changes the center frequency and the bandwidth of the filter by moving a movable part.
Background
In a conventional frequency automatic tuning filter, the filter includes only a first cavity having a first housing and a first opening on the first housing, and a movable member inserted into the first opening. And under the condition that the movable piece and the first shell are contacted with each other, friction is generated between the movable piece and the first shell, so that the phenomenon that the central frequency of the filter is unstable in the offset process is generated. If the relative position disturbance, local deformation and/or gap are caused by the friction between the moving part and the first shell, or the condition of non-contact caused by poor processing precision, the electromagnetic wave of the first cavity is largely dissipated from the gap to the outside of the traditional frequency automatic adjusting and measuring filter, thereby seriously hindering the correct transmission of the electromagnetic wave.
Disclosure of Invention
The invention provides a non-contact type frequency automatic adjusting and measuring filter with a leakage-proof cavity, which comprises a first cavity, a first moving part and a second cavity, wherein the first cavity is provided with a first shell and a first opening on the first shell, the second cavity has a second housing, a first cavity in the second housing, and a second opening and a third opening penetrating the second housing, the first movable piece is inserted into the first cavity from the third opening or inserted between the third opening and the first cavity from the third opening, and the second housing is adapted to the shape of the first movable member adjacent to the portion inserted into the first movable member, the second opening is adjacent to the first movable piece and forms a part of the first chamber, the second shell is provided with a spacing part adjacent to the first movable piece so as to separate the first movable piece from the first chamber, and the first shell and the second shell are not in contact with the first movable piece.
The non-contact type frequency automatic tuning filter with the leakage-proof chamber further comprises a driving unit for adjusting the insertion depth of the first movable piece.
The invention discloses a non-contact type frequency automatic debugging filter with a leakage-proof cavity, wherein the number of the first cavities and the first movable piece is plural, and at least two of the first cavities are communicated.
The non-contact type frequency automatic adjusting and measuring filter with the anti-leakage cavity further comprises a linkage piece which is connected with the first movable pieces of the first cavities which are attached to different cavities so as to coordinate the insertion depth of the first movable pieces.
The invention relates to a non-contact type frequency automatic tuning filter with a leakage-proof cavity, wherein, the second cavities of different first cavities are not communicated.
The non-contact type frequency automatic debugging filter with the anti-leakage cavity further comprises a second moving piece and a fifth opening, at least two of the first cavities are communicated with the first cavity channel, the total number of the first moving piece and the second moving piece is equal to the total number of the third opening and the fifth opening, and the second moving piece and the fifth opening correspond to the first cavity channel so that the second moving piece can be inserted into the first cavity channel from the fifth opening or inserted between the fifth opening and the first cavity channel from the fifth opening.
The invention relates to a non-contact type frequency automatic debugging filter with a leakage-proof cavity, wherein a first shell is provided with a first part and a second part which are opposite, a second cavity is arranged at the first part and further comprises a third movable piece, the second part is further provided with a third shell, a second cavity in the third shell and a third cavity of a sixth opening penetrating through the third shell, and the third movable piece and the sixth opening correspond to a first cavity channel so that the third movable piece can be inserted into the first cavity channel from the sixth opening or inserted into a position between the sixth opening and the first cavity channel from the sixth opening.
The non-contact type frequency automatic tuning filter with the anti-leakage cavity achieves automatic tuning of the center frequency or the bandwidth of the filter by the first cavity and the movable piece with different depths.
Compared with the prior art, the invention provides the structure with the anti-leakage cavity, and the distance is generated between the movable piece and the filter body, so that the movement of the movable piece is stabilized, but a large amount of information leakage cannot be caused.
Drawings
FIG. 1 is a cross-sectional view of a noncontact frequency autotune filter with a leak-proof chamber of the present invention;
FIG. 2 is an enlarged view of a portion of FIG. 1;
fig. 3A and 3B are exploded views of a noncontact frequency automatic tuning filter with a leakage-proof chamber according to one embodiment and another embodiment of the present invention;
fig. 4A and 4B are a schematic diagram of an internal cross-section and an exploded view of a noncontact frequency automatic tuning filter with a leakage-proof chamber according to another embodiment of the present invention;
fig. 5 is a schematic diagram illustrating the effect of preventing electromagnetic wave leakage when the noncontact frequency automatic tuning filter with a leakage-proof chamber transmits electromagnetic waves according to an embodiment of the present invention.
Description of the symbols:
1 non-contact type frequency automatic adjusting and detecting filter with leakage-proof cavity
10 first chamber
10a first part
10b second part
101 first shell
102 first opening
103 resonant cavity
104 first cavity channel
20 first movable part
20' second movable part
20' third movable part
201 side surface
30 second Chamber
30' third Chamber
301 second housing
301' third housing
302 first chamber
302' second chamber
303 second opening
303' fourth opening
304 third opening
304' fifth opening
304 '' sixth opening
306 spacer portion
308 cover body
309 flange
40 linkage part
50 input terminal
60 output terminal
2 leakage of electromagnetic wave
C. Direction of insertion of C
F route
V normal
P1 first pitch
P2 second pitch
The specific implementation mode is as follows:
for a fuller understanding of the objects, features and advantages of the present invention, reference should be made to the following detailed description taken in conjunction with the accompanying drawings, in which:
referring to fig. 1, fig. 2, fig. 3A and fig. 3B, fig. 1 is a cross-sectional view of a noncontact frequency automatic tuning filter with a leakage-proof chamber according to an embodiment of the present invention, fig. 2 is a partially enlarged view of fig. 1, and fig. 3A and fig. 3B are exploded views of the noncontact frequency automatic tuning filter with the leakage-proof chamber according to an embodiment and another embodiment of the present invention, respectively. In fig. 1, a noncontact frequency automatic tuning filter 1 with a leakage-proof chamber according to the present invention includes a first cavity 10, a first movable member 20, and a second cavity 30.
The single first chamber 10 may have the first housing 101 and the first opening 102 on the first housing 101. The first opening 102 may extend through at least a portion of the first housing 101 to form a resonant cavity 103 when the first moveable member 20 is inserted, such that the transmitted electromagnetic waves are not dissipated, such that the electromagnetic waves are transmitted. In the case that the number of the first cavities 10 and the number of the first movable members 20 are plural, at least two of the first cavities 10 may be communicated with each other, that is, as shown in fig. 1 to 3A and 3B, a first cavity passage 104 is provided between two adjacent first cavities 10 to transmit the electromagnetic wave along a series of the first cavities 10. More specifically, as shown in fig. 3A and 3B, the electromagnetic wave can enter the series of first cavities 10 from the input end 50 and the first cavity channel 104 to be transmitted to the output end 60.
The single second chamber 30 as described above may be assigned to the single first chamber 10, and in the case where the number of first chambers 10 is plural, the number of second chambers 30 may be equal to the number of first chambers 10, and communication between the second chambers 30 assigned to different first chambers 10 may be excluded. In the case that the single first cavity 10 is a single second cavity 30, the second cavity 30 may have a second housing 301, a first cavity 302 in the second housing 301, and a second opening 303 and a third opening 304 penetrating through the second housing 301, the third opening 304 may correspond to the first opening 102 so that the first movable member 20 may be inserted into the first cavity 10 (as shown in the middle of fig. 1) from the third opening 304 or inserted between the third opening 304 and the first cavity 10 from the third opening 304, and a portion of the second housing 301 adjacent to the portion inserted into the first movable member 20 is adapted to the shape of the first movable member 20. For example, as shown in fig. 2, the extension of the normal V of the second opening 303 and the extension of the path F of the first moving part 20 from the third opening 304 to the first opening 102 may be at an acute or right angle to adapt to the irregular shape of the first moving part 20, in particular, the extension of the normal V of the second opening 303 and the side surface 201 of the first moving part 20 may be at a right angle. The second opening 303 may be adjacent the first moveable member 20 and form part of the first chamber 302, and the second housing 301 may have a spacer portion 306 adjacent the first moveable member 20 to separate the first moveable member 20 from the first chamber 302. Through the design of the present invention, when the first movable element 20 moves, the electromagnetic wave in the first cavity 10 can be dissipated to the outside of the contactless automatic frequency tuning filter 1 with a leakage-proof cavity in a large amount through the gap between the first movable element 20 and the third opening 304, which may be caused by the movement of the first movable element 20, but is conducted to the second cavity 30 in a small amount through the second opening 303, so that the correct transmission of the electromagnetic wave is maintained to the maximum extent.
Alternatively, as shown in the left and right ends of fig. 3B, at least two of the first cavities 10 are communicated with each other through the first cavity channel 104, and the non-contact type automatic frequency tuning filter 1 with a leakage-proof chamber of the present invention may further include a second movable member 20 'and a fifth opening 304', the total number of the first movable member 20 and the second movable member 20 'may be equal to the total number of the third opening 304 and the fifth opening 304' and the second movable member 20 'and the fifth opening 304' correspond to the first cavity channel 104, so that the second movable member 20 'is inserted into the first cavity channel 104 from the fifth opening 304' or inserted into the space between the fifth opening 304 'and the first cavity channel 104 from the fifth opening 304' along the insertion direction C of fig. 3B.
It is noted that the second movable member 20 'inserted into the first cavity passage 104 from the fifth opening 304' or inserted between the fifth opening 304 'and the first cavity passage 104 from the fifth opening 304' as shown in the left and right ends of fig. 3B may also be designed to correspond to the middle first cavity passage 104 of the series of first cavity passages 104 or other first cavity passages 104, rather than just to be designed to correspond to the left and right end edge first cavity passages 104 of the series of first cavity passages 104.
The second casing 301 of the second cavity 30 far from the first cavity 10 may have a stepped flange 309, so that the cover 308 having the third opening 304 and the second casing 301 are combined together to form the second casing 301. However, in the case of manufacturing using 3D printing, the second housing 301 may be integrally formed. And the shape of the cover 308 may be circular, elliptical, polygonal, or a combination thereof.
In the present invention (as shown in fig. 2), the second housing 301 and the first movable member 20 may not be in contact with each other, so as to avoid an unstable phenomenon of the center frequency of the filter generated in the offset process due to the relative position disturbance, local deformation and/or clearance between the second housing 301 and the first movable member 20 caused by the friction between the second housing 301 and the first movable member 20 when the first movable member 20 moves. Specifically, the second housing 301 has a first distance P1 between the third opening 304 and the inserted first movable member 20.
Similarly, the second gap P2 is provided between the spacer portion 306 of the second housing 301 and the inserted first movable member 20, wherein the first gap P1 may be equal to the second gap P2, and the spacer portion 306 may also indicate that the first movable member 20 is stable during movement, so as to avoid the instability phenomenon described above during movement of the first movable member 20. Although there is a distance between the second housing 301 and the inserted first moving part 20, which causes a large amount of electromagnetic waves to be dissipated to the outside of the contactless frequency automatic tuning filter 1 having a leakage-proof chamber, the present invention adopts a design in which a small amount of leaked electromagnetic waves are introduced into the first chamber 302 through the second opening 303, and a design in which the second housing 301 and the first moving part 20 are not in contact with each other, thereby avoiding an unstable phenomenon of the center frequency of the filter in the shifting process due to friction between the second housing 301 and the first moving part 20, and preventing a large amount of electromagnetic waves from being dissipated to the outside of the contactless frequency automatic tuning filter 1 having a leakage-proof chamber, so as to maintain the correct transmission of electromagnetic waves to the maximum extent.
It is noted that the second cavity 30 corresponding to the first cavity passage 104 may also include a structure similar to the second opening 303 and the spacing portion 306 of the second cavity 30 where the first movable member 20 is inserted, i.e., the fourth opening 303 'and the spacing portion 306 corresponding to the fourth opening 303'.
Similarly, the first housing 101 and the first movable member 20 may not be in contact with each other, so as to avoid the unstable phenomenon of the center frequency of the filter generated in the shifting process due to the friction between the first housing 101 and the first movable member 20.
The noncontact frequency automatic tuning filter 1 with a leakage-proof chamber of the present invention may further include a driving unit to adjust the insertion depth of the first movable member 20 to cause frequency disturbance to achieve frequency offset. The driving unit can cooperate with the linear motion device and the electric control device to move the first movable member 20 up and down relative to the first chamber 10. In addition, the noncontact frequency automatic tuning filter 1 with a leakage-proof chamber of the present invention may further include a linkage 40 connected to each of the first movable members 20 associated with different first cavities 10 to coordinate the insertion depth of each of the first movable members 20.
Fig. 4A and 4B are schematic internal cross-sectional views and exploded views of a noncontact frequency automatic tuning filter with a leakage-proof chamber according to another embodiment of the present invention. In this embodiment, the first housing 101 has a first portion 10a and a second portion 10b opposite to each other. In the case where the first body 101 is circular or elliptical, the first portion 10a and the second portion 10b may be two relatively distant portions in a circular or elliptical housing, and in the case where the first body 101 is polyhedral, the first portion 10a and the second portion 10b may be two relatively distant sides. The second cavity 30 is disposed at the first portion 10a, and the contactless frequency automatic tuning filter 1 with a leakage-proof cavity further includes a third movable member 20 ", and the second portion 10b is further disposed with a third cavity 30 'having a third housing 301', a second cavity 302 'in the third housing 301', and a sixth opening 304 ″ penetrating through the third housing 301 ', and the third movable member 20" and the sixth opening 304 "may correspond to the first cavity channel 104, so that the third movable member 20" may be inserted into the first cavity channel 104 from the sixth opening 304 "along the insertion direction C' or inserted into a space between the sixth opening 304" and the first cavity channel 104 from the sixth opening 304 ". It should be noted that the third cavity 30 ' may also include a fourth opening 303 ', a spacing portion 306, a cover 308 and/or a flange 309 similar to the second cavity 30, and the third movable member 20 ″ may not contact with the first shell 101 and/or the third shell 301 ', and the third shell 301 ' may be integrally disposed with the first shell 101, or the third shell 301 ' may be separately combined with the first shell 101.
In addition, the first to third movable members may share the same linkage member 40, or the first to third movable members may be divided into different linkage members, or the present invention may adopt a combination of the above. Furthermore, the third movable member 20 "may not only be located in the middle first cavity channel 104 corresponding to the series of first cavity channels 104, but also the third movable member 20" may correspond to the left and right end edge first cavity channels 104 of the series of first cavity channels 104.
Fig. 5 is a schematic diagram illustrating the effect of preventing electromagnetic wave leakage when the contactless frequency automatic tuning filter with a leakage-proof chamber transmits electromagnetic waves according to an embodiment of the present invention. When the electromagnetic wave is transmitted to the first moving part 20 and inserted into the first cavity 10, since the second cavity 30 is used in the present invention, the leaked electromagnetic wave 2 leaked from the first cavity 10 can be dissipated to the outside of the noncontact type frequency automatic tuning filter 1 with a leakage-proof cavity (i.e. the leakage-proof electromagnetic wave 2 is prevented from passing through the space between the first moving part 20 and the third opening 304 due to the movement of the first moving part 20), but is conducted to the second cavity 30 through the second opening 303 in a small amount, so as to maintain the correct transmission of the electromagnetic wave to the maximum extent.
In summary, the design of guiding a small amount of leaked electromagnetic waves into the chamber through the second opening of the second cavity and making the movable member not contact with the second housing in the invention enables the non-contact type frequency automatic tuning and measuring filter with the leakage-proof chamber of the invention to have the effect of avoiding the instability of a large amount of leaked electromagnetic waves and the central frequency of the filter in the shifting process.
While the invention has been disclosed in terms of preferred embodiments, it will be understood by those skilled in the art that the embodiments are illustrative only and should not be taken as limiting the scope of the invention. It should be noted that equivalent variations and substitutions to those of the embodiments are intended to be included within the scope of the present invention. Therefore, the protection scope of the present invention is defined by the claims.
Claims (8)
1. A contactless frequency autotuning filter having a leak-proof chamber, comprising:
the first cavity is provided with a first shell and a first opening on the first shell;
a first movable member; and
the second cavity is provided with a second shell, a first cavity in the second shell, a second opening and a third opening, the second opening and the third opening penetrate through the second shell, the first movable piece is inserted into the first cavity from the third opening or is inserted between the third opening and the first cavity from the third opening, the part, adjacent to the second shell, inserted into the first movable piece is matched with the shape of the first movable piece and has a distance with the first movable piece and is not in contact with the first movable piece, the second opening is adjacent to the first movable piece and forms a part of the first cavity, the second shell is provided with a space part adjacent to the first movable piece so as to separate the first movable piece from the first cavity, and the first shell and the second shell are not in contact with the first movable piece.
2. A noncontact frequency autotuning filter having a leakage prevention chamber as claimed in claim 1, further including a drive unit for adjusting the insertion depth of said first movable member.
3. A non-contact automatic frequency tuning filter with a leakage prevention chamber as per claim 1, wherein the number of the first cavities and the first movable member is plural and at least two of the first cavities are communicated.
4. A noncontact frequency automatic tuning filter with a leakage prevention chamber as recited in claim 3 further comprising a linkage member connecting each of said first movable members attached to different ones of said first cavities for coordinating the insertion depth of each of said first movable members.
5. A noncontact frequency autotuning filter having a leakage prevention chamber as claimed in claim 3, wherein each of said second cavities associated with different ones of said first cavities are not in communication with each other.
6. A noncontact frequency automatic tuning filter having a leakage prevention chamber as recited in claim 3 further comprising a second movable member and a fifth opening, at least two of said first cavities being communicated with said first cavity passage, the total number of said first movable member and said second movable member being plural and equal to the total number of said third opening and said fifth opening, and said second movable member and said fifth opening corresponding to said first cavity passage for said second movable member to be inserted into said first cavity passage from said fifth opening or to be inserted between said fifth opening and said first cavity passage from said fifth opening, and further comprising a linking member connecting each of said first movable member and said second movable member which are assigned to different ones of said first cavities, said second movable member being assigned to the same one of said first cavities as an adjacent one of said first movable members, said second movable member being coordinated with each of said first movable members, so as to coordinate the insertion depth of the first movable piece and the second movable piece.
7. A non-contact automatic frequency tuning filter having a leakage prevention chamber as claimed in claim 3, wherein the first housing has a first portion and a second portion disposed opposite to each other and facing each other, the second cavity is disposed at the first portion and further comprises a third movable member, the second portion further comprises a third cavity having a third housing, a second cavity in the third housing and a sixth opening penetrating the third housing, the third movable member and the sixth opening correspond to the first cavity channel, so that the third movable member can be inserted into the first cavity channel from the sixth opening or inserted into the sixth opening and the first cavity channel from the sixth opening.
8. The noncontact frequency autotuning filter with a leakage prevention chamber of claim 1 wherein said noncontact frequency autotuning filter with a leakage prevention chamber achieves automatic tuning of filter center frequency or bandwidth by said first cavity and said first movable member of different depths.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710568168.6A CN109256609B (en) | 2017-07-13 | 2017-07-13 | Non-contact type frequency automatic adjusting and detecting filter with leakage-proof cavity |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710568168.6A CN109256609B (en) | 2017-07-13 | 2017-07-13 | Non-contact type frequency automatic adjusting and detecting filter with leakage-proof cavity |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN109256609A CN109256609A (en) | 2019-01-22 |
| CN109256609B true CN109256609B (en) | 2020-04-03 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710568168.6A Expired - Fee Related CN109256609B (en) | 2017-07-13 | 2017-07-13 | Non-contact type frequency automatic adjusting and detecting filter with leakage-proof cavity |
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| Country | Link |
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| CN (1) | CN109256609B (en) |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201749918U (en) * | 2010-05-31 | 2011-02-16 | 深圳市大富科技股份有限公司 | Cavity filter and filter cavity |
| CN202050042U (en) * | 2011-01-27 | 2011-11-23 | 中兴通讯股份有限公司 | Filter |
| CN204905394U (en) * | 2015-09-01 | 2015-12-23 | 昇达科技股份有限公司 | Wave filter with adjustable |
| CN105489989A (en) * | 2015-12-24 | 2016-04-13 | 中国电子科技集团公司第五十四研究所 | High-power waveguide electrically tunable filter |
| CN106469842A (en) * | 2015-09-01 | 2017-03-01 | 昇达科技股份有限公司 | Adjustable frequency and the wave filter of frequency range |
| CN206148592U (en) * | 2016-09-02 | 2017-05-03 | 摩比天线技术（深圳）有限公司 | Prevent cavity filter that signal revealed |
-
2017
- 2017-07-13 CN CN201710568168.6A patent/CN109256609B/en not_active Expired - Fee Related
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201749918U (en) * | 2010-05-31 | 2011-02-16 | 深圳市大富科技股份有限公司 | Cavity filter and filter cavity |
| CN202050042U (en) * | 2011-01-27 | 2011-11-23 | 中兴通讯股份有限公司 | Filter |
| CN204905394U (en) * | 2015-09-01 | 2015-12-23 | 昇达科技股份有限公司 | Wave filter with adjustable |
| CN106469842A (en) * | 2015-09-01 | 2017-03-01 | 昇达科技股份有限公司 | Adjustable frequency and the wave filter of frequency range |
| CN105489989A (en) * | 2015-12-24 | 2016-04-13 | 中国电子科技集团公司第五十四研究所 | High-power waveguide electrically tunable filter |
| CN206148592U (en) * | 2016-09-02 | 2017-05-03 | 摩比天线技术（深圳）有限公司 | Prevent cavity filter that signal revealed |
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| CN109256609A (en) | 2019-01-22 |
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Granted publication date: 20200403 |