CN113113743B - Single-cavity resonator and radio frequency cavity filter - Google Patents
Single-cavity resonator and radio frequency cavity filter Download PDFInfo
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- CN113113743B CN113113743B CN202110402121.9A CN202110402121A CN113113743B CN 113113743 B CN113113743 B CN 113113743B CN 202110402121 A CN202110402121 A CN 202110402121A CN 113113743 B CN113113743 B CN 113113743B
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- H01P1/00—Auxiliary devices
- H01P1/20—Frequency-selective devices, e.g. filters
- H01P1/207—Hollow waveguide filters
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01P—WAVEGUIDES; RESONATORS, LINES, OR OTHER DEVICES OF THE WAVEGUIDE TYPE
- H01P1/00—Auxiliary devices
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Abstract
The invention relates to the field of communication equipment, and discloses a single-cavity resonator and a radio frequency cavity filter, which comprise a shell, wherein a resonant cavity is arranged in the shell; the cover body is covered on the shell, and the resonant cavity is positioned in the shell and the cover body; the resonant part comprises a first resonant piece and a second resonant piece which are in a sheet shape, the first resonant piece comprises a first connecting end and a first resonant end which are integrated, the first connecting end is connected with the resonant cavity, the first resonant end is positioned in the resonant cavity and is separated from the inner wall of the resonant cavity, the second resonant piece comprises a second connecting end and a second resonant end which are integrated, the second connecting end is connected with the resonant cavity, and the second resonant end is positioned in the resonant cavity and is separated from the inner wall of the resonant cavity; the first resonance end and the second resonance end are spaced to form a frequency modulation space. The single-cavity resonator has small volume, light weight, simple structure and few parts, and is suitable for developing a radio frequency cavity filter with small volume, light weight, simple structure and few parts. The radio frequency cavity filter has the advantages of small volume, light weight, simple structure and few parts.
Description
Technical Field
The invention relates to the technical field of communication equipment, in particular to a single-cavity resonator and a radio frequency cavity filter.
Background
The cavity filter is a microwave filter adopting a resonant cavity structure, and one cavity can be equivalent to an inductor parallel capacitor, so that a resonant level is formed, and microwave filtering is realized. It is an indispensable important device in the communication system, and the performance of the device directly affects the performance index of the whole communication system.
The cavity filter mainly comprises a cavity, a cover plate covering the cavity, a debugging screw, a locking nut, a set screw and the like, wherein a resonance column is arranged on the cavity, and a screw through hole for installing the set screw and the debugging screw is formed in the cover plate. With the upgrading and development of communication technology, related products put higher demands on the miniaturization and light weight of the cavity filter. And present traditional cavity filter then has more problem, mainly embodies at: 1. the design of the cavity filter with smaller size and lighter weight cannot be realized due to the limitation of the resonant frequency of the circular resonant piece; 2. the traditional cavity filter has various material types (such as debugging screws, locking nuts, fastening screws and the like for example), the assembly relation is complex, the depth of each debugging screw inserted into the corresponding cylindrical resonance part needs to be manually adjusted one by one to carry out resonant cavity frequency modulation, and the production automation is not facilitated to be realized.
Therefore, it is desirable to provide a single-cavity resonator and a rf cavity filter, which can solve the above problems.
Disclosure of Invention
One objective of the present invention is to provide a single-cavity resonator, which has the advantages of small size, light weight, simple structure and few parts, and is suitable for developing a radio frequency cavity filter with small size, light weight, simple structure and few parts.
In order to achieve the purpose, the invention adopts the following technical scheme:
a single cavity resonator comprising:
a housing having a resonant cavity therein;
the cover body is covered on the shell, and the resonant cavity is positioned in the shell and the cover body;
the resonance part comprises a first resonance piece and a second resonance piece which are of a sheet structure, the first resonance piece comprises a first connecting end and a first resonance end which are integrally connected, the first connecting end is connected in the resonance cavity, the first resonance end is accommodated in the resonance cavity and is arranged at intervals with the inner wall of the resonance cavity, the second resonance piece comprises a second connecting end and a second resonance end which are integrally connected, the second connecting end is connected in the resonance cavity, and the second resonance end is accommodated in the resonance cavity and is arranged at intervals with the inner wall of the resonance cavity;
the first resonance end of the first resonance plate and the second resonance end of the second resonance plate are arranged side by side at intervals to form a frequency modulation interval for adjusting the resonance frequency at intervals.
Optionally, the first resonant end includes a planar side plane, and the second resonant end includes a planar side plane, where the side plane of the first resonant end and the side plane of the second resonant end are parallel and opposite to each other.
Optionally, the first resonator plate and the second resonator plate are of a metal plate structure.
Optionally, the cover comprises:
the frequency adjusting test piece and one end of the first resonance end far away from the first connecting end are arranged at intervals, and the distance between the frequency adjusting test piece and one end of the first resonance end far away from the first connecting end is adjustable.
Optionally, the first connection end of the first resonant chip is connected to the bottom of the housing away from the cover, and the second connection end of the second resonant chip is connected to the cover.
Another objective of the present invention is to provide a rf cavity filter, which has the advantages of small size, light weight, simple structure and few parts.
In order to achieve the purpose, the invention adopts the following technical scheme:
a radio frequency cavity filter comprising a plurality of single cavity resonators as described above, the housings of the plurality of single cavity resonators collectively forming a filter housing comprising a plurality of the resonant cavities, the covers of the plurality of single cavity resonators collectively forming a cover plate, the resonant elements within each of the resonant cavities being capacitively coupled in turn to form a filter circuit structure for resonant filtering.
Optionally, the radio frequency cavity filter further includes:
an input terminal connected to the first resonator plate of the resonator element at one end of the filter circuit structure, the input terminal extending to the filter housing;
and the output end is connected with the first resonance sheet of the resonance piece positioned at the other end of the filter circuit structure, and the output end extends to the filter shell.
Optionally, the radio frequency cavity filter further includes:
an input-output separation plate disposed in the filter housing, and the input-output separation plate separates the resonance member connected with the input end from the resonance member connected with the output end.
Optionally, the radio frequency cavity filter further includes:
the coupling debugging piece is arranged between the two resonance pieces in mutual capacitive coupling at intervals, and the depth of the coupling debugging piece extending into the space between the two resonance pieces is adjustable.
Optionally, the filter housing comprises:
the bottom shell is provided with a containing groove used for containing the resonance piece, and the cover plate is detachably arranged on an opening of the containing groove in a covering mode.
The invention has the beneficial effects that:
the resonance piece of the single-cavity resonator is different from the structure of the existing cylindrical resonance piece, the resonance piece comprises a first resonance piece and a second resonance piece which are of a sheet structure, and the first resonance piece and the second resonance piece are arranged at intervals to form a frequency modulation interval for adjusting resonance frequency, so that a desired frequency band can be selected by adjusting the frequency modulation interval, the first resonance piece and the second resonance piece are of sheet structures, the occupied space is small, and the forming is convenient; moreover, the single-cavity resonator omits debugging screws, locking nuts, set screws and other parts used in the frequency modulation of the existing cylindrical resonant part, and the frequency modulation processing can be realized only by adjusting the frequency modulation interval, so that the number of the parts is greatly reduced, the whole structure is greatly simplified, the size and the weight of the single-cavity resonator are effectively reduced, and the single-cavity resonator can be widely applied to the development of miniaturized various radio frequency cavity filters.
The radio frequency cavity filter comprises a plurality of single-cavity resonators provided by the invention, wherein shells of the single-cavity resonators jointly form a filter shell comprising a plurality of resonant cavities, and resonant pieces in the resonant cavities are sequentially capacitively coupled to form a filter circuit structure for resonant filtering. Because the resonance piece comprising the first resonance piece and the second resonance piece which are arranged at intervals is adopted to replace the existing cylindrical resonance piece, compared with the traditional radio frequency cavity filter, the radio frequency cavity filter has the advantages of small volume, light weight, simple structure and few parts, and can be widely applied to the field of 5G communication.
Drawings
FIG. 1 is a disassembled schematic view of a single-cavity resonator provided by the present invention;
FIG. 2 is a disassembled schematic view of the RF cavity filter provided by the present invention;
FIG. 3 is a schematic view of a radio frequency cavity filter with a cover plate removed according to the present invention;
fig. 4 is a schematic diagram of a first resonator plate of one of the resonator elements of the rf cavity filter according to the present invention;
fig. 5 is a schematic diagram of a second resonator plate of one of the resonator elements of the rf cavity filter according to the present invention;
fig. 6 is a schematic diagram illustrating a connection position of a first resonator plate and a second resonator plate of each resonator member after a cover plate of the rf cavity filter is opened;
fig. 7 is one of schematic diagrams of a filter housing of the rf cavity filter provided by the present invention;
fig. 8 is a second schematic diagram of a filter housing of the rf cavity filter according to the present invention;
FIG. 9 is a bottom view of the RF cavity filter provided by the present invention;
FIG. 10 is a cross-sectional view taken at A-A of FIG. 9;
fig. 11 is a cross-sectional view at B-B in fig. 9.
In the figure:
100. a resonant cavity;
1. a filter cavity; 11. a cover plate; 111. a frequency adjustment test piece; 112. coupling the test strip; 12. a filter housing; 121. a bottom case; 122. an insulating block; 2. a resonating piece; 21. a first resonator plate; 211. a first connection end; 212. a first resonant end; 22. a second resonator plate; 221. a second connection end; 222. a second resonant end; 3. an input-output partition plate; 4. an input end; 5. and (4) an output end.
Detailed Description
In order to make the technical problems solved, the technical solutions adopted and the technical effects achieved by the present invention clearer, the technical solutions of the present invention are further described below by way of specific embodiments with reference to the accompanying drawings.
In the description of the present invention, unless expressly stated or limited otherwise, the terms "connected," "connected," and "fixed" are to be construed broadly, e.g., as meaning permanently connected, removably connected, or integral to one another; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
In the present invention, unless otherwise expressly stated or limited, "above" or "below" a first feature means that the first and second features are in direct contact, or that the first and second features are not in direct contact but are in contact with each other via another feature therebetween. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. "beneath," "under" and "beneath" a first feature includes the first feature being directly beneath and obliquely beneath the second feature, or simply indicating that the first feature is at a lesser elevation than the second feature.
In the description of the present embodiment, the terms "upper", "lower", "left", "right", and the like are used based on the orientations and positional relationships shown in the drawings only for convenience of description and simplification of operation, and do not indicate or imply that the referred device or element must have a specific orientation, be configured and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first" and "second" are used only for descriptive purposes and are not intended to have a special meaning.
As shown in fig. 1, the present embodiment provides a single-cavity resonator, which has the advantages of small volume, light weight, simple structure and few parts. The single cavity resonator comprises a housing, a cover and a resonator element 2. A resonant cavity 100 is arranged in the shell; the cover body is covered on the shell, and the resonant cavity 100 is positioned in the shell and the cover body; the resonant member 2 comprises a first resonant plate 21 and a second resonant plate 22 which are of a plate-shaped structure, the first resonant plate 21 comprises a first connecting end 211 and a first resonant end 212 which are integrally connected, the first connecting end 211 is connected in the resonant cavity 100, the first resonant end 212 is accommodated in the resonant cavity 100 and is arranged at an interval with the inner wall of the resonant cavity 100, the second resonant plate 22 comprises a second connecting end 221 and a second resonant end 222 which are integrally connected, the second connecting end 221 is connected in the resonant cavity 100, and the second resonant end 222 is accommodated in the resonant cavity 100 and is arranged at an interval with the inner wall of the resonant cavity 100; the first resonant end 212 of the first resonant plate 21 and the second resonant end 222 of the second resonant plate 22 are arranged side by side at an interval to form a frequency modulation interval for adjusting the resonant frequency. By adjusting the distance between the first resonance end 212 of the first resonator plate 21 and the second resonance end 222 of the second resonator plate 22, the applicable frequency range of the single-cavity resonator can be correspondingly adjusted.
Specifically, the first resonator plate 21 and the second resonator plate 22 are metal plate structures, and in some other examples, they may also be gold-plated plate structures, which are light in weight and low in cost, or one of them is a metal plate structure and the other is a gold-plated plate structure; the first connection end 211 of the first resonant plate 21 is connected to the bottom of the housing away from the cover, and the second connection end 221 of the second resonant plate 22 is connected to the cover. In the case where it is necessary to change the distance between the first resonance end 212 of the first resonance plate 21 and the second resonance end 222 of the second resonance plate 22, the positions of the corresponding connection structures for connecting the second connection end 221 of the second resonance plate 22 may be different depending on different lid bodies, and therefore, the distance between the first resonance end 212 of the first resonance plate 21 and the second resonance end 222 of the second resonance plate 22 can be changed as needed by replacing an appropriate lid body, and the overall applicability is improved. First resonance end 212 is including being planar lateral part plane, and second resonance end 222 is including being planar lateral part plane, and the lateral part plane of first resonance end 212 is parallel and relative setting with the lateral part plane of second resonance end 222, and overall structure is the simple body, and processing is convenient, small in size, is applicable to the development and design of miniaturized radio frequency cavity filter. Meanwhile, as shown in fig. 2 to 8, the present embodiment further provides a radio frequency cavity filter, where the radio frequency cavity filter includes a plurality of single-cavity resonators provided in the present embodiment, a filter housing 12 including a plurality of resonant cavities 100 is formed by housings of the plurality of single-cavity resonators together, a cover plate 11 is formed by covers of the plurality of single-cavity resonators together, the cover plate 11 and the filter housing 12 form a filter cavity 1 together, and the plurality of resonant cavities 100 are formed in the filter cavity 1. The resonator elements 2 in each resonator cavity 100 are in turn capacitively coupled to form a filter circuit structure for resonant filtering. It should be noted that the first resonator plate 21 and the second resonator plate 22 of the resonator 2 may be designed into corresponding shapes according to actual design requirements, and are not limited to the shapes provided in fig. 4 to 6 of this embodiment, as long as the first resonator plate 21 and the second resonator plate 22 are ensured to be sheet-shaped and spaced apart from each other to form a frequency modulation pitch, and the materials of the first resonator plate 21 and the second resonator plate 22 may also be selected and designed according to actual requirements, and are not limited specifically.
Further, for the single cavity resonator, in addition to the resonance frequency modulation by adjusting the pitch of the first and second resonator plates 21 and 22, the resonance frequency modulation is realized. As shown in fig. 1, in the present embodiment, the cover includes a frequency adjustment test piece 111. The frequency tuning test piece 111 and the end of the first resonant end 212 far away from the first connection end 211 are arranged at an interval, and the distance between the frequency tuning test piece 111 and the end of the first resonant end 212 far away from the first connection end 211 is adjustable, so that the frequency tuning test piece 111 can be pressed to adjust resonance frequency modulation. Similarly, as shown in fig. 2 to 8, the rf cavity filter also includes a frequency tuning strip 111, and the frequency can be tuned by the frequency tuning strip 111.
The resonance piece 2 of the single-cavity resonator of the embodiment is different from the structure of the existing cylindrical resonance piece, the resonance piece 2 comprises a first resonance piece 21 and a second resonance piece 22 which are of a sheet structure, and the first resonance piece 21 and the second resonance piece 22 are arranged at intervals to form a frequency modulation interval for adjusting the resonance frequency, so that a desired frequency band can be selected by adjusting the frequency modulation interval, and the first resonance piece 21 and the second resonance piece 22 are of sheet structures, so that the occupied space is small, and the forming is convenient; moreover, the single-cavity resonator omits debugging screws, locking nuts, set screws and other parts used in the frequency modulation of the existing cylindrical resonant part, and the frequency modulation processing can be realized only by adjusting the frequency modulation interval, so that the number of the parts is greatly reduced, the whole structure is greatly simplified, the size and the weight of the single-cavity resonator are effectively reduced, and the single-cavity resonator can be widely applied to the development of miniaturized radio frequency cavity filters of various types. Similarly, the resonator 2 adopted by the rf cavity filter of the present embodiment includes the first resonator plate 21 and the second resonator plate 22 which are arranged at intervals and are in a plate shape, and the existing cylindrical resonator is replaced with the resonator 2, and the plate structure has a small volume and a simple structure. Therefore, compared with the traditional radio frequency cavity filter, the radio frequency cavity filter has the advantages of small size, light weight, simple structure and few parts, and can be widely applied to the field of 5G communication.
As shown in fig. 2, 4 and 9-11, the rf cavity filter provided in this embodiment further includes an input end 4 and an output end 5. The input terminal 4 is connected to the first resonator plate 21 of the resonator element 2 at one end of the filter circuit configuration, the input terminal 4 extending to the filter housing 12. In some embodiments, the input 4 extends out of the filter housing 12 for connection to external lines; the output 5 is connected to the first resonator plate 21 of the resonator element 2 at the other end of the filter circuit arrangement, the output 5 extending to the filter housing 12. In some embodiments, the output 5 extends out of the filter housing 12 for connection to external wiring. The input end 4 and the output end 5 are respectively used for being communicated with external circuits, and therefore the functions of receiving and transmitting signals are achieved. Furthermore, the input end 4 and the output end 5 are respectively connected to the first resonant sheet 21 of the corresponding resonant member 2 in an integrated manner, so that the number of parts is reduced, the overall structure and the manufacturing process are simplified, the manufacturing cost is reduced, and the production efficiency is improved.
More specifically, as shown in fig. 2 and 8, in the present embodiment, the filter housing 12 of the rf cavity filter includes a bottom case 121 and an insulating block 122, where the bottom case 121 is a metal case or a gold-plated case. An accommodating groove for accommodating the resonance element 2 is formed in the bottom case 121, and the cover plate 11 is detachably covered on an opening of the accommodating groove. The number of the insulating blocks 122 is two, the two insulating blocks 122 are respectively fixed on the bottom case 121 at positions back to the cover plate 11, and the input end 4 and the output end 5 are respectively one-to-one inserted into a corresponding one of the insulating blocks 122 and finally extend to the outside of the bottom case 121 for connecting an external circuit. The insulating block 122 mainly plays a role of preventing the input terminal 4 and the output terminal 5 from being shorted with the bottom case 121.
When the number of resonator elements 2 is large (for example 3 or more), it is to be avoided that the resonator element 2 with the input 4 is directly coupled to the resonator element 2 with the output 5. As shown in fig. 3, 6 and 9-11, the rf cavity filter further includes an input-output splitter plate 3. The input and output division plate 3 is arranged in the filter shell 12, the input and output division plate 3 separates the resonance part 2 connected with the input end 4 from the resonance part 2 connected with the output end 5, and then the resonance part 2 with the input end 4 can only be coupled with other resonance parts 2, and then other resonance parts 2 are coupled with the resonance part 2 with the output end 5, and finally indirectly coupled with the resonance part 2 with the output end 5, so as to form a filter circuit structure of resonance filtering.
In addition, as shown in fig. 6-7, in the present embodiment, the rf cavity filter further includes a coupling tuning strip 112 disposed on the cover plate 11. The coupling debugging sheet 112 is arranged between the two resonators 2 which are capacitively coupled with each other at intervals, the depth of the coupling debugging sheet 112 extending into the space between the two resonators 2 is adjustable, and further the coupling debugging sheet 112 can be pressed to perform coupling adjustment.
Further, the cavity of the traditional cavity filter is of a die-casting forming structure, so that the size is large, and the miniaturization design is not easy to realize. In this embodiment, on the one hand, the bottom case 121 of the rf cavity filter may be implemented by various processes, specifically, the bottom case may be formed by bending a metal plate, welding a plurality of sheets in combination, and forming a drawing mold, or by die casting an aluminum alloy. The material of the bottom case 121 may be selected from various materials, such as copper plating, copper non-plating, stainless steel plating, aluminum alloy die casting, magnesium alloy die casting, and the like. Bottom shell 121 is formed by processing plates, so that the volume is smaller, and the volume of the radio frequency cavity filter is further reduced. On the other hand, the cover plate 11 is also formed by directly processing a plate, the frequency adjusting test piece 111 and the coupling adjusting piece 112 are formed by punching the end face of the cover plate 11, the structure is simple, the number of parts is small, the size is greatly reduced, the size of the radio frequency cavity filter is further reduced, and the miniaturization design is realized.
The above description is only a preferred embodiment of the present invention, and it should not be understood that the present invention is limited to the details of the embodiment and the range of applications, which can be changed by those skilled in the art according to the spirit of the present invention.
Claims (9)
1. A single cavity resonator, comprising:
a shell, wherein a resonant cavity (100) is arranged in the shell;
the cover body is covered on the shell, and the resonant cavity (100) is positioned in the shell and the cover body;
the resonant part (2) comprises a first resonant plate (21) and a second resonant plate (22) which are of a plate-shaped structure, the first resonant plate (21) comprises a first connecting end (211) and a first resonant end (212) which are integrally connected, the first connecting end (211) is connected into the resonant cavity (100), the first resonant end (212) is accommodated into the resonant cavity (100) and is arranged at a distance from the inner wall of the resonant cavity (100), the second resonant plate (22) comprises a second connecting end (221) and a second resonant end (222) which are integrally connected, the second connecting end (221) is connected into the resonant cavity (100), and the second resonant end (222) is accommodated into the resonant cavity (100) and is arranged at a distance from the inner wall of the resonant cavity (100);
wherein the first resonance end (212) of the first resonance sheet (21) and the second resonance end (222) of the second resonance sheet (22) are arranged side by side at intervals to form a frequency modulation interval for adjusting the resonance frequency at intervals;
the first connecting end (211) of the first resonant chip (21) is connected to the bottom of the shell body far away from the cover body, and the second connecting end (221) of the second resonant chip (22) is connected to the cover body.
2. The single cavity resonator according to claim 1, wherein the first resonance end (212) comprises a planar side plane and the second resonance end (222) comprises a planar side plane, the side plane of the first resonance end (212) being parallel to and opposite the side plane of the second resonance end (222).
3. A single cavity resonator according to claim 1, wherein said first (21) and second (22) resonator plates are of a metal plate-like structure.
4. The single-cavity resonator of claim 1, wherein the cover comprises:
the frequency adjusting test piece (111) and one end of the first resonance end (212) far away from the first connecting end (211) are arranged at intervals, and the distance between the frequency adjusting test piece (111) and one end of the first resonance end (212) far away from the first connecting end (211) is adjustable.
5. A radio frequency cavity filter, comprising a plurality of single cavity resonators as claimed in any one of claims 1-4, the housings of the plurality of single cavity resonators together forming a filter housing (12) comprising a plurality of said resonant cavities (100), the covers of the plurality of single cavity resonators together forming a cover plate (11), the resonant members (2) in each of the resonant cavities (100) in turn being capacitively coupled to form a filter circuit structure for resonant filtering.
6. The radio frequency cavity filter of claim 5, further comprising:
-an input terminal (4) connected to the first resonator plate (21) of the resonator element (2) at one end of the filter circuit arrangement, the input terminal (4) extending to the filter housing (12);
an output (5) connected to the first resonator plate (21) of the resonator element (2) at the other end of the filter circuit arrangement, the output (5) extending to the filter housing (12).
7. The radio frequency cavity filter of claim 6, further comprising:
an input-output separation plate (3) disposed in the filter housing (12), and the input-output separation plate (3) separates the resonance member (2) connected to the input end (4) from the resonance member (2) connected to the output end (5).
8. The radio frequency cavity filter of claim 7, further comprising:
the coupling adjusting test piece (112) is arranged on the cover plate (11), the coupling adjusting test piece (112) is arranged between the two resonance pieces (2) which are mutually capacitively coupled at intervals, and the depth of the coupling adjusting test piece (112) extending into the space between the two resonance pieces (2) is adjustable.
9. The radio frequency cavity filter according to claim 5, wherein the filter housing (12) comprises:
the bottom shell (121) is provided with a containing groove for containing the resonance piece (2), and the cover plate (11) is detachably arranged on the opening of the containing groove in a covering mode.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202110402121.9A CN113113743B (en) | 2021-04-14 | 2021-04-14 | Single-cavity resonator and radio frequency cavity filter |
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| CN202110402121.9A CN113113743B (en) | 2021-04-14 | 2021-04-14 | Single-cavity resonator and radio frequency cavity filter |
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| CN113113743B true CN113113743B (en) | 2022-06-10 |
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| CN113540716A (en) * | 2021-08-30 | 2021-10-22 | 苏州波发特电子科技有限公司 | Novel filter |
| CN114614223B (en) * | 2022-03-23 | 2023-11-24 | 京信射频技术(广州)有限公司 | Base station antenna and cavity filter |
| CN114927843B (en) * | 2022-05-16 | 2023-11-24 | 京信射频技术(广州)有限公司 | Filter and communication device |
| CN115064852B (en) * | 2022-07-18 | 2023-10-31 | 苏州立讯技术有限公司 | Filter and manufacturing method thereof |
| CN115207586A (en) * | 2022-07-18 | 2022-10-18 | 昆山立讯射频科技有限公司 | Cavity filter |
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| EP1143552A1 (en) * | 2000-03-09 | 2001-10-10 | Lucent Technologies Inc. | Sheet-metal filter |
| CN111509341B (en) * | 2015-11-13 | 2021-12-07 | 康普公司意大利有限责任公司 | Tuning element, device, filter assembly and method for tuning a filter |
| CN106910967B (en) * | 2017-03-23 | 2020-10-16 | 广东通宇通讯股份有限公司 | Radio frequency device and double-end short-circuit dielectric filter thereof |
| US10587029B2 (en) * | 2017-09-07 | 2020-03-10 | Qorvo Us, Inc. | Multi-layer substrate with integrated resonator |
| SE1950508A1 (en) * | 2019-04-26 | 2020-10-06 | Microdata Telecom Innovation Stockholm Ab | Sheet metal rf cavity filter |
| CN112838347A (en) * | 2021-02-26 | 2021-05-25 | 江苏亨鑫科技有限公司 | Frame type resonator and filter |
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