CN215377648U - Microwave filter device - Google Patents
Microwave filter device Download PDFInfo
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- CN215377648U CN215377648U CN202121522733.3U CN202121522733U CN215377648U CN 215377648 U CN215377648 U CN 215377648U CN 202121522733 U CN202121522733 U CN 202121522733U CN 215377648 U CN215377648 U CN 215377648U
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Abstract
A microwave filtering device comprises at least one microwave combined filter, wherein the microwave combined filter comprises 14 resonant cavity filters; the resonant cavity filter comprises a filtering device main body and a filtering device cover body, wherein the filtering device main body is a metal resonant cavity with an upper opening, and the filtering device cover body covers the upper opening of the metal resonant cavity: a 14-order combined filter is adopted, and inductive cross coupling is adopted among the first resonant cavity filter, the third resonant cavity filter, the eighth resonant cavity filter, the tenth resonant cavity filter, the twelfth resonant cavity filter and the fourteenth resonant cavity filter, so that 3 transmission zeros are generated at the high end of a pass band; inductive cross coupling is adopted between the fourth resonant cavity filter and the seventh resonant cavity filter, capacitive cross coupling is adopted between the fifth resonant cavity filter and the seventh resonant cavity filter, and 2 transmission zeros are generated at the low end of the pass band; capacitive cross coupling is adopted between the tenth resonant cavity filter and the twelfth resonant cavity filter, so that 1 transmission zero is generated at the low end of the pass band, and the strong rejection function of the stop band is realized.
Description
Technical Field
The utility model relates to a microwave filtering device, in particular to a microwave resonance filtering device.
Background
The microwave filter is a key device of a modern mobile communication system and is widely applied to wireless communication base stations and various communication terminals; the microwave cavity filter structure is composed of a radio frequency connector, a cavity, a cover plate, a plurality of resonator units and a frequency tuning and coupling strength adjusting component, wherein the resonant frequencies of the plurality of resonator units are distributed in a passband range, and the microwave cavity filter structure has a blocking function on signals outside the resonant frequencies, so that the function of selecting microwave transmission signals is realized; the 5G cavity filter has the advantages of reliable structure, wide filtering frequency band, parasitic pass band far away from a channel, high Q value, large power capacity, stable electrical property, good heat dissipation performance and the like.
And the microwave resonant cavity is used for a resonant circuit of a microwave band. Is a closed metal cavity, the electromagnetic field is limited in the cavity, and can be realized by various transmission lines. The main parameters of the microwave resonant cavity include resonant frequency, quality factor, etc. The resonance frequency ω depends on the cavity structure dimensions and the mode of operation. The quality factor Q is an important parameter for describing the microwave resonant cavity, and directly determines performance parameters such as frequency selectivity, bandwidth and damping factor, and can be defined as: the loss of the resonant cavity depends only on the internal cavity losses (metal conductor losses and dielectric losses).
In practical application, the microwave resonant cavity is connected with an external circuit. The microwave resonant cavity has multiple resonant structures such as a cavity, a planar microstrip, a fin line and a medium, and energy is input into the cavity or output to a load through a coupling structure in practical application.
The 5G mobile communication system has the characteristics that the requirement on a microwave filter is very high, the working frequency band of the 5G mobile communication system requires 3700-3980 MHz, the requirement on in-band loss is small, the average insertion loss of 100MHz is less than 0.95dB, the anti-interference capability is strong, the 10MHz outside a pass band is more than 25dB inhibition, the 19GHz frequency band inhibition is more than 20dB, the power capacity is large, the normal-temperature and normal-pressure bearing power is more than 500W, and the like, and the conventional microwave filter is difficult to achieve.
SUMMERY OF THE UTILITY MODEL
The utility model solves the problem that various microwave filter structures in the prior art are difficult to meet the requirements of a 5G mobile communication system, and provides a 14-order 6-zero combined microwave filter through elaborate design and repeated experiments.
A microwave filtering device comprises at least one microwave combined filter, wherein the microwave combined filter comprises 14 resonant cavity filters; the resonant cavity filter comprises a filtering device main body and a filtering device cover body, wherein the filtering device main body is a metal resonant cavity with an upper opening, and the filtering device cover body covers the upper opening of the metal resonant cavity; the fifth resonant cavity filter and the seventh resonant cavity filter are capacitively cross-coupled to generate a low-end zero; the tenth resonant cavity filter and the twelfth resonant cavity filter are capacitively cross-coupled to generate a low-end zero point; the first resonant cavity filter and the third resonant cavity filter are inductively cross-coupled to generate a high-end zero point; the fourth resonant cavity filter and the seventh resonant cavity filter are inductively cross-coupled to generate a high-end zero; the eighth resonant cavity filter and the tenth resonant cavity filter are inductively cross-coupled to generate a high-end zero; and the twelfth resonant cavity filter and the fourteenth resonant cavity filter are inductively cross-coupled to generate a high-end zero.
The microwave filtering device, the third resonant cavity filter and the fourth resonant cavity filter are inductively coupled; the seventh resonant cavity filter is inductively coupled with the eighth resonant cavity filter; the first resonant cavity filter is inductively coupled with the second resonant cavity filter; the second resonant cavity filter is inductively coupled with the third resonant cavity filter; the fourth resonant cavity filter is inductively coupled with the fifth resonant cavity filter; the fifth resonant cavity filter is inductively coupled with the sixth resonant cavity filter; the sixth resonant cavity filter is inductively coupled with the seventh resonant cavity filter; the eighth resonant cavity filter is inductively coupled with the ninth resonant cavity filter; the ninth resonant cavity filter is inductively coupled with the tenth resonant cavity filter; the tenth resonant cavity filter is inductively coupled with the eleventh resonant cavity filter; the eleventh resonant cavity filter is inductively coupled with the twelfth resonant cavity filter; the twelfth resonant cavity filter is inductively coupled with the thirteenth resonant cavity filter; the thirteenth resonant cavity filter is inductively coupled with the fourteenth resonant cavity filter.
In the microwave filtering device, the filtering device main body is distributed on an integrally formed main structure member, 14 filtering device cover bodies are distributed on a unified main cover body, the resonant cavity filter comprises a metal resonant cavity and a metal resonant rod, and the metal resonant cavity is distributed on the main structure member.
In the microwave filtering device, 14 resonant cavity filters are arranged in 2 rows.
In the microwave filtering device, 14 resonant cavity filters are arranged in 3 rows, 5 in the first row, 5 in the second row and 4 in the third row.
In the microwave filtering device, 14 resonant cavity filters are arranged in 5 rows, wherein 4 rows comprise 3 filters, and one row comprises 2 filters.
The microwave filtering device comprises a first coupling probe, a second coupling probe and a supporting clamping seat in capacitive cross coupling, wherein the first coupling probe and the second coupling probe are oppositely clamped on the supporting clamping seat, the supporting clamping seat is positioned between two adjacent cavity filters, and the first coupling probe and the second coupling probe are respectively positioned in cavities of the two adjacent cavity filters.
In the microwave filtering device, 14 metal resonant cavities are machined from one metal, and the cover body of the filtering device is machined from one metal plate; the metal resonant cavity is internally provided with a metal resonant rod, one end of the metal resonant rod is connected with the bottom of the metal resonant cavity, and the other end of the metal resonant rod is positioned in the metal resonant cavity and is connected with a metal resonant ring.
The microwave filtering device comprises a tuning screw rod on a filtering device cover body, the tuning screw rod is installed on the filtering device cover body through threads, one end of the tuning screw rod comprises a thread rotating interface, and the other end of the tuning screw rod extends into a metal resonant cavity.
In the microwave filtering device, the height of the metal resonant cavity is 18.30 mm, and the distance between the metal resonant ring and the filtering device cover body is 1.70 mm.
The microwave filtering device comprises a filtering component formed by more than two microwave combined filters, a main body of the microwave combined filter component is formed by processing a metal plate, and a cover body of the filtering device of the microwave combined filter component is formed by processing a metal plate.
The microwave combined filter comprises 14-order microwave combined filters, each order of microwave combined filter comprises a resonance unit, the resonance frequency of each resonance unit is distributed in the passband range of 5G signals, and the microwave combined filter has a blocking function on signals outside the resonance frequency, so that the function of selecting microwave transmission signals is realized; the cavity filter has the advantages of reliable structure, wide filtering frequency band, parasitic pass band far away from a channel, high Q value, large power capacity, stable electrical property, good heat dissipation performance and the like; the S parameter response oscillogram of the band-pass filter consisting of the 14-order microwave combined filter can well meet the requirements of the 5G protocol; two rows or 3 rows or 5 rows are adopted for arrangement, so that arrangement of 14 resonant cavity filters and arrangement of coupling relation among the resonant cavity filters can be better realized; the metal probe can realize the capacitive cross coupling between the two resonant cavity filters; the overall performance of the microwave filtering device can be conveniently adjusted by adjusting 14 tuning screws; on a metal part, 14 resonant filters are processed, so that the coupling relation among the resonant filter devices can be greatly improved, the structural strength is improved, and the production and processing cost is greatly reduced.
Drawings
FIG. 1: the topological structure of the microwave filtering device of the preferred embodiment is schematic;
FIG. 2: 5G microwave band-pass filter S parameter response oscillogram of the mobile communication system;
FIG. 3: two-row arrangement schematic diagram of 14 resonant filters of the preferred embodiment;
FIG. 4: a schematic structural diagram of a preferred embodiment capacitively coupled probe;
FIG. 5: a schematic diagram of the structural parameters of a resonator filter of the preferred embodiment;
FIG. 6: a microwave filter device according to a preferred embodiment is shown in perspective;
FIG. 7: a microwave filter device according to a preferred embodiment is shown in a schematic perspective exploded view;
FIG. 8: a schematic top view of the filter body of the first preferred embodiment.
Detailed Description
The following is a description of preferred embodiments of the utility model.
It is to be understood that the preferred embodiments of the present invention are merely illustrative of the general principles of the present invention and are not to be construed as limiting the utility model in any way. The serial numbers in the first resonant cavity filter to the fourteenth resonant cavity filter described in the present application only serve as labels and do not represent logical precedence relationships between them.
As shown in fig. 1, a microwave filtering apparatus includes at least one microwave combining filter including 14 resonant cavity filters; the resonant cavity filter comprises a filtering device main body and a filtering device cover body, wherein the filtering device main body is a metal resonant cavity with an upper opening, and the filtering device cover body covers the upper opening of the metal resonant cavity; the fifth resonant cavity filter 5 and the seventh resonant cavity filter 7 are capacitively cross-coupled to generate a low-end zero; the tenth resonant cavity filter 10 and the twelfth resonant cavity filter 12 are capacitively cross-coupled to generate a low-end zero; the first resonant cavity filter 1 and the third resonant cavity filter 3 are inductively cross-coupled to generate a high-end zero point; the fourth resonant cavity filter 4 and the seventh resonant cavity filter 7 are inductively cross-coupled to generate a high-end zero; the eighth resonant cavity filter 8 and the tenth resonant cavity filter 10 are inductively cross-coupled to generate a high-end zero; the twelfth resonant cavity filter 12 and the fourteenth resonant cavity filter 14 are inductively cross-coupled to generate a high-end zero. The third resonant cavity filter 3 is inductively coupled with the fourth resonant cavity filter 4; the seventh resonant cavity filter 7 is inductively coupled with the eighth resonant cavity filter 8; the first resonant cavity filter 1 is inductively coupled with the second resonant cavity filter 2; the second resonant cavity filter 2 is inductively coupled with the third resonant cavity filter 3; the fourth resonant cavity filter 4 is inductively coupled with the fifth resonant cavity filter 5; the fifth resonant cavity filter 5 is inductively coupled with the sixth resonant cavity filter 6; the sixth resonant cavity filter 6 is inductively coupled with the seventh resonant cavity filter 7; the eighth resonant cavity filter 8 is inductively coupled with the ninth resonant cavity filter 9; the ninth resonant cavity filter 9 is inductively coupled with the tenth resonant cavity filter 10; the tenth resonant cavity filter 10 is inductively coupled with the eleventh resonant cavity filter 11; the eleventh resonant cavity filter 11 is inductively coupled with the twelfth resonant cavity filter 12; the twelfth resonant cavity filter 12 is inductively coupled with the thirteenth resonant cavity filter 13; the thirteenth resonant cavity filter 13 is inductively coupled to the fourteenth resonant cavity filter 14.
As shown in the topological structure diagram of the 14 th-order filter shown in fig. 1, a 14 th-order combined filter is adopted, and inductive cross coupling is adopted between the first resonant cavity filter 1 and the third resonant cavity filter 3, between the eighth resonant cavity filter 8 and the tenth resonant cavity filter 10, and between the twelfth resonant cavity filter 12 and the fourteenth resonant cavity filter 14, so that 3 transmission zeros are generated at the high end of the pass band; inductive cross coupling is adopted between the fourth resonant cavity filter 4 and the seventh resonant cavity filter 7, capacitive cross coupling is adopted between the fifth resonant cavity filter 5 and the seventh resonant cavity filter 7, and 2 transmission zeros are generated at the low end of the pass band; capacitive cross coupling is adopted between the tenth resonant cavity filter 10 and the twelfth resonant cavity filter 12, so that 1 transmission zero is generated at the low end of the pass band, and the function of strong stop band suppression is realized; 14-order combined filters, each microwave combined filter comprises a resonance unit, the resonance frequency of each resonance unit is distributed in the passband range of the 5G signal, and the microwave combined filters have a blocking function on signals outside the resonance frequency, so that the selection function of microwave transmission signals is realized; the cavity filter has the advantages of reliable structure, wide filtering frequency band, parasitic pass band far away from a channel, high Q value, large power capacity, stable electrical property, good heat dissipation performance and the like.
As shown in fig. 2, the S parameter response waveform of the bandpass filter composed of 14 th order combined filter can meet the requirement of 5G protocol very well.
In some embodiments, the filter body is distributed on an integrally formed metal structural member, the cavity is formed by rotary milling, 14 filter covers are distributed on a unified main cover, the main cover integrally covers the filter body, each resonant cavity filter is relatively independent, each resonant cavity filter comprises a metal resonant cavity and a metal resonant rod, and the metal resonant cavities are distributed on the main structural member.
The microwave cavity filter structure is generally composed of a radio frequency connector, a cavity, a cover plate, a plurality of resonator units and a frequency tuning and coupling strength adjusting component, wherein 14 resonant filters are processed on one metal component, so that the coupling relation among all resonant filter devices can be greatly improved, the structural strength is improved, and the production and processing cost is greatly reduced.
In some embodiments, the 14 resonant cavity filters are arranged in 2 columns. Through a large number of experiments and tests, as shown in fig. 3, the structure of 2 rows can better arrange 14 resonant cavity filters, and the associated resonant filters must be placed at adjacent positions due to the relationships of 'inductive coupling', 'inductive cross-coupling' between the resonant filters. In the embodiment shown in fig. 3, two rows are adopted, so that the arrangement of 14 resonant cavity filters and the arrangement of coupling relationship between the resonant cavity filters can be better realized.
In some embodiments, the 14 resonant cavity filters are arranged in 3 columns, a first column of 5, a second column of 5, and a third column of 4. As shown in fig. 8, through a large number of experiments and tests, the 3 rows of structures in the frame line 8030 can better arrange 14 resonant cavity filters, and can better realize the relationships of "inductive coupling", "inductive cross coupling", and "inductive cross coupling" of the 14 resonant cavity filters.
In some embodiments, the 14 resonant cavity filters are arranged in 5 columns, with 4 columns comprising 3 filters and one column comprising 2 filters. As shown in fig. 8, through a large number of experiments and tests, the 5-row structure in the frame line 8040 can better arrange 14 resonant cavity filters, and can better realize the relationships of "inductive coupling", "inductive cross coupling", and "inductive cross coupling" of the 14 resonant cavity filters.
In some embodiments, the capacitive cross coupling includes a first coupling probe 401, a second coupling probe 402, and a supporting socket 411, the first coupling probe and the second coupling probe are relatively clamped on the supporting socket 411, the supporting socket is located between two adjacent cavity filters, and the first coupling probe and the second coupling probe are respectively located in the cavities of the two adjacent cavity filters. As shown in fig. 4, in an embodiment of capacitive cross coupling, by disposing a supporting socket 411 between two resonator filters and disposing a first coupling probe 401 and a second coupling probe 402 respectively, capacitive cross coupling between the two resonator filters can be achieved. As shown in fig. 3, capacitive cross coupling is realized between the fifth resonant cavity filter 5 and the seventh resonant cavity filter 7, and between the tenth resonant cavity filter 10 and the twelfth resonant cavity filter 12 through a coupling probe.
In some embodiments, the 14 metal resonators are machined from a single piece of metal, and the filter cover is machined from a single piece of sheet metal; the metal resonant cavity is internally provided with a metal resonant rod, one end of the metal resonant rod is connected with the bottom of the metal resonant cavity, and the other end of the metal resonant rod is positioned in the metal resonant cavity and is connected with a metal resonant ring. As shown in fig. 5, in an embodiment of the resonant cavity filter, a cavity 5010 is first machined in metal, and then a metal resonant rod 5020 is installed, and one end of the metal resonant rod 5020 includes a metal resonant ring 5021.
In some embodiments, the filter device cover includes a tuning screw, the tuning screw is mounted on the filter device cover through a thread, one end of the tuning screw includes a thread rotation interface, and the other end of the tuning screw extends into the metal resonant cavity. As shown in fig. 5, the filter cover 5030 includes a tuning screw 5040 for adjusting the tuning screw to adjust the corresponding resonator filter, and the overall performance of the microwave filter can be adjusted by adjusting 14 tuning screws.
In some embodiments, the height of the metal resonator 5010 is 18.30 mm, and the distance between the metal resonator ring 5021 and the filter device cover 5030 is 1.70 mm. As shown in fig. 5, given the specific dimensions of an embodiment of the resonator filter, according to the 5G protocol, the microwave filter device must meet the corresponding standards, and the shape and size of the resonator filter cavity, and the extension relationship of the adjusting screw, all have an influence on the filter parameters of the resonator filter, as shown in fig. 5, the applicant has obtained through a large number of simulation calculations and reagent tests, and if the fine adjustment of the structural dimensions according to the applicant's disclosure, or equivalent components, can be used to practice the present invention, these adjustments and dimensions should fall within the scope of the present application.
In some embodiments, two or more microwave combined filters form a filtering assembly, the main body of the microwave combined filter assembly is formed by machining a metal plate, and the cover body of the filtering device of the microwave combined filter assembly is formed by machining a metal plate. The microwave cavity filter structure is generally composed of a radio frequency connector, a cavity, a cover plate, a plurality of resonator units and a frequency tuning and coupling strength adjusting component, wherein 14 resonant filters are processed on one metal component, so that the coupling relation among all resonant filter devices can be greatly improved, the structural strength is improved, and the production and processing cost is greatly reduced.
As shown in fig. 6 to 8, in a microwave filtering apparatus, 4 microwave combined filters are included to form a filtering component, the 4 microwave combined filters include a common filtering apparatus main body 7010 and a filtering apparatus cover 7020, a plurality of microwave combined filters are integrated into one filtering apparatus, so that multiple filters can be combined into a whole, and the current carrying capacity of the microwave filtering apparatus can be improved or the filtering performance can be improved by connecting the microwave combined filters in series or in parallel.
Referring to fig. 8, 14 resonator filters are arranged in 2 rows in a frame line 8010 and a frame line 8020 to form a microwave combining filter. The 8030, 14 resonator filters are arranged in 3 rows to form a microwave combining filter. The wire 8040, 14 resonator filters are arranged in 5 rows to form a microwave combining filter. Through arrangement and combination, a plurality of microwave combination filters are integrated in a microwave filtering device to form a filtering component, so that the microwave combined filter is convenient to use in a multi-channel filtering scene.
While the utility model has been illustrated and described in terms of a preferred embodiment and several alternatives, the utility model is not limited by the specific description provided in this specification. Other additional alternative or equivalent components may also be used in the practice of the present invention.
Claims (10)
1. A microwave filtering device, characterized by:
the method comprises the following steps: at least one microwave combination filter, the microwave combination filter comprises 14 resonant cavity filters; the resonant cavity filter comprises a filtering device main body and a filtering device cover body, wherein the filtering device main body is a metal resonant cavity with an upper opening, and the filtering device cover body covers the upper opening of the metal resonant cavity;
the fifth resonant cavity filter and the seventh resonant cavity filter are capacitively cross-coupled to generate a low-end zero; the tenth resonant cavity filter and the twelfth resonant cavity filter are capacitively cross-coupled to generate a low-end zero point; the first resonant cavity filter and the third resonant cavity filter are inductively cross-coupled to generate a high-end zero point; the fourth resonant cavity filter and the seventh resonant cavity filter are inductively cross-coupled to generate a high-end zero; the eighth resonant cavity filter and the tenth resonant cavity filter are inductively cross-coupled to generate a high-end zero; and the twelfth resonant cavity filter and the fourteenth resonant cavity filter are inductively cross-coupled to generate a high-end zero.
2. A microwave filtering arrangement according to claim 1, wherein:
the third resonant cavity filter is inductively coupled with the fourth resonant cavity filter; the first resonant cavity filter is inductively coupled with the second resonant cavity filter; the second resonant cavity filter is inductively coupled with the third resonant cavity filter; the fourth resonant cavity filter is inductively coupled with the fifth resonant cavity filter; the fifth resonant cavity filter is inductively coupled with the sixth resonant cavity filter; the sixth resonant cavity filter is inductively coupled with the seventh resonant cavity filter; the seventh resonant cavity filter is inductively coupled with the eighth resonant cavity filter; the eighth resonant cavity filter is inductively coupled with the ninth resonant cavity filter; the ninth resonant cavity filter is inductively coupled with the tenth resonant cavity filter; the tenth resonant cavity filter is inductively coupled with the eleventh resonant cavity filter; the eleventh resonant cavity filter is inductively coupled with the twelfth resonant cavity filter; the twelfth resonant cavity filter is inductively coupled with the thirteenth resonant cavity filter; the thirteenth resonant cavity filter is inductively coupled with the fourteenth resonant cavity filter.
3. A microwave filtering arrangement according to claim 1, wherein:
the filter device main body is distributed on an integrally formed main body structural member, 14 filter device cover bodies are distributed on a unified main cover body,
the resonant cavity filter comprises a metal resonant cavity and a metal resonant rod, wherein the metal resonant cavity is distributed on the main structural member.
4. A microwave filtering arrangement according to claim 2, wherein:
the 14 resonant cavity filters are arranged in 2 columns.
5. A microwave filtering arrangement according to claim 2, wherein:
the 14 resonator filters are arranged in 3 rows, 5 in the first row, 5 in the second row and 4 in the third row.
6. A microwave filtering arrangement according to claim 2, wherein:
the 14 resonant cavity filters are arranged in 5 columns, where 4 columns include 3 filters and one column includes 2 filters.
7. A microwave filtering arrangement according to claim 1, wherein:
the capacitive cross coupling comprises a first coupling probe, a second coupling probe and a supporting clamping seat,
the first coupling probe and the second coupling probe are oppositely clamped on the supporting clamping seat, the supporting clamping seat is positioned between the two adjacent cavity filters, and the first coupling probe and the second coupling probe are respectively positioned in the cavities of the two adjacent cavity filters.
8. A microwave filtering arrangement according to claim 1, wherein:
the 14 metal resonant cavities are formed by processing a metal, and the cover body of the filtering device is formed by processing a metal plate;
the metal resonant cavity is internally provided with a metal resonant rod, one end of the metal resonant rod is connected with the bottom of the metal resonant cavity, and the other end of the metal resonant rod is positioned in the metal resonant cavity and is connected with a metal resonant ring.
9. A microwave filtering arrangement according to claim 7, wherein:
the filter device comprises a filter device cover body, a tuning screw rod and a metal resonant cavity, wherein the filter device cover body comprises a tuning screw rod, the tuning screw rod is arranged on the filter device cover body through threads, one end of the tuning screw rod comprises a thread rotating interface, and the other end of the tuning screw rod extends into the metal resonant cavity; the height of the metal resonant cavity is 18.30 millimeters, and the distance between the metal resonant ring and the cover body of the filtering device is 1.70 millimeters.
10. A microwave filtering arrangement according to claim 1, wherein:
more than two microwave combined filters form a filtering component, the main body of the microwave combined filter component is formed by processing a metal plate, and the cover body of the filtering device of the microwave combined filter component is formed by processing a metal plate.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121522733.3U CN215377648U (en) | 2021-07-06 | 2021-07-06 | Microwave filter device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121522733.3U CN215377648U (en) | 2021-07-06 | 2021-07-06 | Microwave filter device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN215377648U true CN215377648U (en) | 2021-12-31 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202121522733.3U Active CN215377648U (en) | 2021-07-06 | 2021-07-06 | Microwave filter device |
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| CN (1) | CN215377648U (en) |
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2021
- 2021-07-06 CN CN202121522733.3U patent/CN215377648U/en active Active
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