CN220106855U - Cavity filter - Google Patents
Cavity filter Download PDFInfo
- Publication number
- CN220106855U CN220106855U CN202321449936.3U CN202321449936U CN220106855U CN 220106855 U CN220106855 U CN 220106855U CN 202321449936 U CN202321449936 U CN 202321449936U CN 220106855 U CN220106855 U CN 220106855U
- Authority
- CN
- China
- Prior art keywords
- resonant
- cavity
- cover plate
- columns
- rod
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
- 230000006835 compression Effects 0.000 claims description 4
- 238000007906 compression Methods 0.000 claims description 4
- 238000010146 3D printing Methods 0.000 claims description 3
- 238000004519 manufacturing process Methods 0.000 abstract description 10
- 238000004891 communication Methods 0.000 description 5
- 238000000034 method Methods 0.000 description 3
- 238000003466 welding Methods 0.000 description 3
- 238000010923 batch production Methods 0.000 description 2
- 230000008094 contradictory effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
Landscapes
- Control Of Motors That Do Not Use Commutators (AREA)
Abstract
The utility model discloses a cavity filter, which comprises a cavity, an upper cover plate, a plurality of tuning screws, an input connector and an output connector. The cavity is separated into a plurality of resonant cavities which are at least upwards open, the resonant cavities are internally provided with resonant bodies, each resonant body comprises a resonant rod and a resonant column which are integrally formed, the first ends of the resonant rods are integrally formed with the side walls of the resonant cavities, the second ends of the resonant rods are in cross connection with the resonant columns, and the resonant columns extend up and down in the resonant cavities. The upper cover plate is fixed on the upper side of the cavity. The tuning screws are arranged on the upper cover plate and extend into the resonant cavities respectively, the bottom ends of the tuning screws face the resonant rods and are spaced up and down with the resonant rods, and one sides of the tuning screws face the resonant columns and are spaced from the resonant columns. The input connector and the output connector are arranged on the side wall of the cavity and are respectively connected with one of the resonant rods. The utility model can greatly reduce the types and the quantity of materials, simplify the manufacturing process, improve the production efficiency and reduce the cost.
Description
Technical Field
The utility model relates to the technical field of filters, in particular to a cavity filter.
Background
The development of civil wireless communication technology has been advanced for many years into the 5G era, and the filter has been developed towards miniaturization, low power consumption and low price. The existing filter has large volume, high cost and complicated manufacturing process, and becomes a main obstacle for miniaturization of wireless communication products.
The filter is a typical frequency selection device, can effectively inhibit useless signals, and the quality of a communication system is directly influenced by the performance of the filter through useful signals, so that the filter is a key device in a modern microwave and millimeter wave communication system.
The existing cavity filter comprises a plurality of resonant rods, wherein each resonant rod comprises a rod part and a disc part connected to the top end of the rod part, and the resonant rods are formed by stamping through a die. A plurality of resonant rods are respectively fastened into the cavity by mounting screws. However, the cavity filter has the following technical problems: the materials are various and quantity, the assembly is complex, the production efficiency is low, and the cost is high.
Therefore, there is a need for improved and optimized cavity filters that advantageously solve at least one of the above-mentioned problems.
Disclosure of Invention
The present utility model is directed to a cavity filter, which is advantageous for solving at least one technical problem in the above-mentioned background art.
In order to achieve the above object, the present utility model provides a cavity filter comprising:
the cavity is divided into a plurality of resonant cavities which are at least upwards opened, the resonant cavities are internally provided with resonant bodies, the resonant bodies comprise resonant rods and resonant columns which are integrally formed, the first ends of the resonant rods are integrally formed with the side walls of the resonant cavities, the second ends of the resonant rods are in cross connection with the resonant columns, and the resonant columns extend up and down in the resonant cavities;
the upper cover plate is covered and fixed on the upper side of the cavity;
the tuning screws are arranged on the upper cover plate and extend into the resonant cavities respectively, the bottom ends of the tuning screws face the resonant rods and are spaced up and down from the resonant rods, and one sides of the tuning screws face the resonant columns and are spaced from the resonant columns;
the input connector and the output connector are arranged on the side wall of the cavity and are respectively connected with one of the resonant rods, and a loop is formed between the input connector and the output connector.
Optionally, the cavity is formed by integral stamping or 3D printing.
Optionally, the resonant cavity has a first corner and a second corner disposed diagonally, the resonant rod extends from the first corner and toward the second corner, and the resonant column is adjacent to the second corner.
Optionally, the resonant column extends along the second corner in a horizontal direction, and the second end of the resonant rod is connected at an inner corner of the resonant column.
Optionally, the resonant rod extends from the middle part of the side wall of the resonant cavity in the up-down direction, and the resonant rod is connected to the middle part of the resonant column in the up-down direction.
Optionally, in the up-down direction, the top end of the side wall of the resonant cavity extends upwards beyond the resonant body, and the bottom end of the side wall of the resonant cavity extends downwards beyond the resonant body.
Optionally, the plurality of resonant cavities are opened downwards; the cavity filter further comprises a lower cover plate, the lower cover plate is fixedly arranged on the lower side of the cavity in a covering mode, and the lower cover plate and the resonant body are arranged at intervals.
Optionally, the bottom end of the cavity protrudes downwards to form a plurality of protruding columns, the protruding columns and the cavity are integrally formed, and the bottom surfaces of the protruding columns are recessed to form grooves; the lower cover plate is provided with a plurality of through holes respectively matched with the convex columns, when the lower cover plate covers the cavity, the convex columns are respectively sleeved on the through holes, and the lower ends of the convex columns extend out of the corresponding through holes and are outwards folded through stamping to form flanging parts which are in compression joint with the lower cover plate.
Optionally, the top end of the cavity protrudes upwards to form a plurality of protruding columns, the protruding columns and the cavity are integrally formed, and the top surface of each protruding column is concavely formed with a groove; the upper cover plate is provided with a plurality of through holes respectively matched with the convex columns, when the upper cover plate covers the cavity, the convex columns are respectively sleeved on the through holes, and the upper ends of the convex columns extend out of the corresponding through holes and are outwards folded through stamping to form flanging parts which are in compression joint with the upper cover plate.
Optionally, the resonant rod connected with the input connector is connected with a first connecting arm, one end of the first connecting arm is integrally formed on the resonant rod, and the other end of the first connecting arm is connected with the input connector; the resonant rod connected with the output connector is connected with a second connecting arm, one end of the second connecting arm is integrally formed on the resonant rod, and the other end of the second connecting arm is connected with the output connector.
In the utility model, a plurality of resonant bodies are integrally formed in the cavity, namely, a plurality of resonant bodies are part of the cavity, and the resonant rod and the resonant column of the resonant bodies can replace the function of the existing resonant rod. According to the utility model, the plurality of resonant rods are not required to be assembled on the cavity by using the mounting screws, and the assembly structure of the existing cavity, the plurality of resonant rods and the plurality of mounting screws can be replaced by only one independent component of the cavity, so that the variety and the number of materials can be greatly reduced, the manufacturing process is simplified, the production efficiency is improved and the cost is reduced.
Drawings
Fig. 1 is a schematic perspective view of a cavity filter according to an embodiment of the present utility model.
Fig. 2 is an exploded view of a cavity filter according to an embodiment of the present utility model.
Fig. 3 is a schematic perspective view of a cavity, an input connector and an output connector according to an embodiment of the present utility model.
Fig. 4 is a schematic top view of the cavity, the input connector and the output connector according to an embodiment of the present utility model.
Fig. 5 is a schematic perspective view of a cavity filter according to an embodiment of the present utility model after the upper cover plate, the lower cover plate, and other structures are hidden.
Fig. 6 is a schematic cross-sectional view of a partial structure of a cavity filter according to an embodiment of the present utility model, in which the stud has not been stamped.
Detailed Description
In order to describe the technical content, the constructional features, the achieved objects and effects of the present utility model in detail, the following description is made in connection with the embodiments and the accompanying drawings.
It should be noted that all directional indicators (such as up, down, left, right, front, and rear … …) in the embodiments of the present utility model are merely used to explain the relative positional relationship, movement, etc. between the components in a particular posture (as shown in the drawings), and if the particular posture is changed, the directional indicator is changed accordingly.
In the present utility model, unless specifically stated and limited otherwise, the terms "connected," "affixed," and the like are to be construed broadly, and for example, "affixed" may be a fixed connection, a removable connection, or an integral body; can be mechanically or electrically connected; either directly or indirectly, through intermediaries, or both, may be in communication with each other or in interaction with each other, unless expressly defined otherwise. The specific meaning of the above terms in the present utility model can be understood by those of ordinary skill in the art according to the specific circumstances.
In addition, if there is a description of "first", "second", etc. in the embodiments of the present utility model, the description of "first", "second", etc. is for descriptive purposes only and is not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In addition, the meaning of "and/or" as it appears throughout includes three parallel schemes, for example "A and/or B", including the A scheme, or the B scheme, or the scheme where A and B are satisfied simultaneously. In addition, the technical solutions of the embodiments may be combined with each other, but it is necessary to base that the technical solutions can be realized by those skilled in the art, and when the technical solutions are contradictory or cannot be realized, the combination of the technical solutions should be considered to be absent and not within the scope of protection claimed in the present utility model.
Referring to fig. 1 to 6, the present utility model discloses a cavity filter, which comprises a cavity 10, an upper cover plate 20, a plurality of tuning screws 30, an input connector 40 and an output connector 50. The cavity 10 is divided into a plurality of resonant cavities 11 which are at least upwards opened, a resonant body 12 is arranged in the resonant cavities 11, the resonant body 12 comprises a resonant rod 13 and a resonant column 14 which are integrally formed, a first end of the resonant rod 13 is integrally formed with the side wall of the resonant cavity 11, a second end of the resonant rod 13 is in cross connection with the resonant column 14, and the resonant column 14 extends up and down in the resonant cavities 11. The upper cover plate 20 is fixedly covered on the upper side of the cavity 10, so that signals are only transmitted in the cavity 10, and the upper cover plate 20 can be formed by stamping. The tuning screws 30 are arranged on the upper cover plate 20 and respectively extend into the resonant cavities 11, the bottom ends of the tuning screws 30 face the resonant rods 13 and are spaced up and down from the resonant rods 13, one sides of the tuning screws 30 face the resonant columns 14 and are spaced from the resonant columns 14, and frequency errors caused by tolerance of the cavities 10 can be corrected through the tuning screws 30. The input connector 40 and the output connector 50 are installed at the side wall of the cavity 10 and are respectively connected with one of the plurality of resonant rods 13, and a loop is formed between the input connector 40 and the output connector 50, namely, after the signal of the input connector 40 is input into the cavity 10, the signal is transmitted through the cavity 10 and is output from the output connector 50.
In the present utility model, a plurality of resonators 12 are integrally formed in a cavity 10, that is, a plurality of resonators 12 are part of the cavity 10, and a resonant rod 13 and a resonant column 14 of the resonators 12 can replace the existing resonant rod. According to the utility model, a plurality of resonant rods are not required to be assembled on the cavity 10 by using the mounting screws, and the assembly structure of the existing cavity, the resonant rods and the mounting screws can be replaced by only one independent part of the cavity 10, so that the variety and the number of materials can be greatly reduced, the manufacturing process is simplified, the production efficiency is improved and the cost is reduced.
In some embodiments, the cavity 10 is formed by integral stamping or 3D printing.
In some embodiments, the resonant cavity 11 has a first corner 15 and a second corner 16 arranged diagonally, the resonant rod 13 extends from the first corner 15 and towards the second corner 16, and the resonant post 14 is adjacent to the second corner 16.
Specifically, the resonating post 14 extends along the second corner 16 in a horizontal direction, and the second end of the resonating rod 13 is connected at an inside corner of the resonating post 14, thereby facilitating an increase in the area of the resonating post 14 toward the tuning screw 30.
In a specific example, part of the resonant cavity 11 has a rectangular parallelepiped shape, and accordingly, the resonant pillar 14 extends in a substantially L-shape (cross section in the horizontal direction) along the second corner 16 in the horizontal direction. Part of the resonant cavity 11 has a rectangular parallelepiped shape with a cut corner (a sharp corner of the second corner is cut away, or a sharp corner of the first and second corners is cut away), and accordingly, the resonant pillar 14 extends in a substantially C-shape (a cross section in the horizontal direction) along the second corner 16 in the horizontal direction. Of course, the resonant pillars 14 are not limited to the above-described form.
In some embodiments, the resonant rod 13 protrudes from the middle of the sidewall of the resonant cavity 11 in the up-down direction, and the resonant rod 13 is connected to the middle of the resonant column 14 in the up-down direction.
In some embodiments, the top end of the side wall of the resonant cavity 11 extends upward beyond the resonant body 12, and the bottom end of the side wall of the resonant cavity 11 extends downward beyond the resonant body 12 in the up-down direction, so that the resonant body 12 can be prevented from contacting the cover plate.
In some embodiments, several resonant cavities 11 are open downwards; the cavity filter further comprises a lower cover plate 50, wherein the lower cover plate 50 is fixedly arranged on the lower side of the cavity 10 in a covering way so that signals can be transmitted in the cavity 10 only, and the lower cover plate 50 is arranged at a distance from the resonator body 12. Specifically, the lower cover plate 50 may be formed by press molding.
Specifically, the bottom end of the cavity 10 protrudes downward to form a plurality of protruding columns 17, the protruding columns 17 and the cavity 10 are integrally formed, and the bottom surface of the protruding column 17 is recessed to form a groove 171; the lower cover plate 50 is formed with a plurality of through holes 51 respectively adapted to the plurality of convex columns 17, when the lower cover plate 50 is covered on the cavity 10, the plurality of convex columns 17 are respectively sleeved on the plurality of through holes 51, and the lower ends of the plurality of convex columns 17 extend out of the corresponding through holes 51 and are turned outwards through stamping to form a flanging part which is crimped on the lower cover plate 50. Through the technical means, a plurality of screws are not required to be additionally provided for fastening the lower cover plate 50 and the cavity 10, as long as a plurality of convex columns 17 with grooves 171 are integrally formed on the cavity 10, a plurality of through holes 51 can be formed on the lower cover plate 50, when the lower cover plate 50 is assembled on the cavity 10, the lower ends of the plurality of convex columns 17 can be stamped to reliably fix the lower cover plate 50 on the cavity 10, the number and the variety of materials of the cavity filter can be effectively reduced, the assembly process is simplified, the efficiency in batch production is improved, the manufacturing and material cost is reduced, and the manpower and material resources are saved.
In some embodiments, the top end of the cavity 10 protrudes upwards to form a plurality of protruding columns 18, the plurality of protruding columns 18 are integrally formed with the cavity 10, and the top surface of each protruding column 18 is concavely formed with a groove 181; the upper cover plate 20 is formed with a plurality of through holes 21 respectively matched with the plurality of convex columns 18, when the upper cover plate 20 is covered on the cavity 10, the plurality of convex columns 18 are respectively sleeved on the plurality of through holes 21, and the upper ends of the plurality of convex columns 18 extend out of the corresponding through holes 21 and are folded outwards through stamping to form a flanging part which is crimped on the upper cover plate 20. Through the technical means, a plurality of screws are not required to be additionally provided for fastening the upper cover plate 20 and the cavity 10, as long as a plurality of convex columns 18 with grooves 181 are integrally formed on the cavity 10, a plurality of through holes 21 are formed on the upper cover plate 20, when the upper cover plate 20 is assembled on the cavity 10, the upper cover plate 20 can be reliably fixed on the cavity 10 by stamping the upper ends of the plurality of convex columns 18, the number and the variety of materials of the filter of the cavity 10 can be effectively reduced, the assembly process is simplified, the efficiency in batch production is improved, the manufacturing and material cost is reduced, and the manpower and material resources are saved.
In some embodiments, the resonant rod 13 connected with the input connector 40 is connected with a first connecting arm 191, one end of the first connecting arm 191 is integrally formed on the resonant rod 13, and the other end of the first connecting arm 191 is connected with the input connector 40, specifically, connected with the input connector 40 by welding; the resonant lever 13 connected to the output connector 50 is connected to a second connecting arm 192, one end of the second connecting arm 192 is integrally formed with the resonant lever 13, and the other end of the second connecting arm 192 is connected to the output connector 50, specifically, connected to the output connector 50 by welding. By providing the first connecting arm 191 and the second connecting arm 192, connection with the input connector 40 and the output connector 50 is facilitated.
Specifically, the input connector 40 and the output connector 50 are PIN needles, but are not limited thereto.
In order to facilitate understanding of the present utility model, the process of assembling the cavity 10 filter in the example of the present utility model is described below. It is to be understood that the order of assembly is not limited by the order of description below.
The input connector 40 is mounted on the side wall of the cavity 10 and welded with the first connecting arm 191;
mounting the output connector 50 on the side wall of the chamber 10 and welding with the second connecting arm 192;
the lower cover plate 50 is covered on the cavity 10, a plurality of through holes 51 on the lower cover plate 50 are respectively sleeved with a plurality of convex columns 17 at the bottom end of the cavity 10, and the lower ends of the convex columns 17 are punched to be outwards folded to form a flanging part which is crimped on the lower cover plate 50, so that the lower cover plate 50 is reliably fixed on the cavity 10;
mounting a plurality of tuning screws 30 on the upper cover plate 20;
the upper cover plate 20 is covered on the cavity 10, a plurality of through holes 51 on the upper cover plate 20 are respectively sleeved with a plurality of convex columns 18 at the top end of the cavity 10, and the upper ends of the convex columns 18 are punched to be outwards folded to form a flanging part which is crimped on the upper cover plate 20, so that the upper cover plate 20 is reliably fixed on the cavity 10;
the input connector 40 and the output connector 50 are connected to the vector network analyzer, and errors are corrected by rotating the tuning screw 30.
The foregoing description of the preferred embodiments of the present utility model is not intended to limit the scope of the claims, which follow, as defined in the claims.
Claims (10)
1. A cavity filter, comprising:
the cavity is divided into a plurality of resonant cavities which are at least upwards opened, the resonant cavities are internally provided with resonant bodies, the resonant bodies comprise resonant rods and resonant columns which are integrally formed, the first ends of the resonant rods are integrally formed with the side walls of the resonant cavities, the second ends of the resonant rods are in cross connection with the resonant columns, and the resonant columns extend up and down in the resonant cavities;
the upper cover plate is covered and fixed on the upper side of the cavity;
the tuning screws are arranged on the upper cover plate and extend into the resonant cavities respectively, the bottom ends of the tuning screws face the resonant rods and are spaced up and down from the resonant rods, and one sides of the tuning screws face the resonant columns and are spaced from the resonant columns;
the input connector and the output connector are arranged on the side wall of the cavity and are respectively connected with one of the resonant rods, and a loop is formed between the input connector and the output connector.
2. The cavity filter of claim 1, wherein the cavity is formed by integral stamping or 3D printing.
3. The cavity filter of claim 1, wherein the resonant cavity has a first corner and a second corner disposed diagonally, the resonant rod extends from the first corner and toward the second corner, and the resonant post is proximate the second corner.
4. A cavity filter according to claim 3, wherein the resonator rod extends in a horizontal direction along the second corner, the second end of the resonator rod being connected at an inside corner of the resonator rod.
5. The cavity filter according to claim 1, wherein the resonance rod protrudes from a middle portion of a side wall of the resonance cavity in an up-down direction, and the resonance rod is connected to a middle portion of the resonance post in the up-down direction.
6. The cavity filter according to claim 1, wherein a top end of a side wall of the resonator cavity extends upward beyond the resonator body in an up-down direction, and a bottom end of the side wall of the resonator cavity extends downward beyond the resonator body.
7. The cavity filter of claim 1, wherein a plurality of said resonant cavities are downwardly open; the cavity filter further comprises a lower cover plate, the lower cover plate is fixedly arranged on the lower side of the cavity in a covering mode, and the lower cover plate and the resonant body are arranged at intervals.
8. The cavity filter according to claim 7, wherein the bottom end of the cavity protrudes downwards to form a plurality of protruding columns, the protruding columns are integrally formed with the cavity, and the bottom surfaces of the protruding columns are recessed to form grooves; the lower cover plate is provided with a plurality of through holes respectively matched with the convex columns, when the lower cover plate covers the cavity, the convex columns are respectively sleeved on the through holes, and the lower ends of the convex columns extend out of the corresponding through holes and are outwards folded through stamping to form flanging parts which are in compression joint with the lower cover plate.
9. The cavity filter according to claim 1, wherein the top end of the cavity protrudes upwards to form a plurality of protruding columns, the protruding columns are integrally formed with the cavity, and the top surfaces of the protruding columns are recessed to form grooves; the upper cover plate is provided with a plurality of through holes respectively matched with the convex columns, when the upper cover plate covers the cavity, the convex columns are respectively sleeved on the through holes, and the upper ends of the convex columns extend out of the corresponding through holes and are outwards folded through stamping to form flanging parts which are in compression joint with the upper cover plate.
10. The cavity filter according to claim 1, wherein the resonant rod connected to the input connector is connected to a first connecting arm, one end of the first connecting arm is integrally formed on the resonant rod, and the other end of the first connecting arm is connected to the input connector; the resonant rod connected with the output connector is connected with a second connecting arm, one end of the second connecting arm is integrally formed on the resonant rod, and the other end of the second connecting arm is connected with the output connector.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321449936.3U CN220106855U (en) | 2023-06-07 | 2023-06-07 | Cavity filter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321449936.3U CN220106855U (en) | 2023-06-07 | 2023-06-07 | Cavity filter |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN220106855U true CN220106855U (en) | 2023-11-28 |
Family
ID=88843219
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202321449936.3U Active CN220106855U (en) | 2023-06-07 | 2023-06-07 | Cavity filter |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN220106855U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116487847A (en) * | 2023-06-07 | 2023-07-25 | 东莞鸿爱斯通信科技有限公司 | cavity filter |
-
2023
- 2023-06-07 CN CN202321449936.3U patent/CN220106855U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116487847A (en) * | 2023-06-07 | 2023-07-25 | 东莞鸿爱斯通信科技有限公司 | cavity filter |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| KR101479152B1 (en) | Transverse magnetic mode dielectric resonator and base station | |
| CN220106855U (en) | Cavity filter | |
| CN116487847A (en) | cavity filter | |
| CN116404391B (en) | Resonator, filter and manufacturing method thereof | |
| JPH09306595A (en) | Shielded connector | |
| CN112768929B (en) | A 5G sheet metal forming dual-band filter antenna | |
| CN113224486A (en) | Air strip line filter | |
| CN112886254A (en) | Novel 5G millimeter wave dual-polarized horn antenna | |
| CN113809492A (en) | Miniaturized filter | |
| CN108461879B (en) | Cavity filter | |
| CN220086344U (en) | Miniaturized filter | |
| CN111430892B (en) | 5G WIFI antenna and electronic terminal equipment | |
| CN117937081A (en) | Dual-mode filter | |
| CN221203144U (en) | Electronic controller shielding structure | |
| CN219843146U (en) | Dielectric resonator antenna capable of generating sum and difference beams | |
| CN215008521U (en) | Air strip line filter | |
| CN215732125U (en) | Filter | |
| CN220604955U (en) | Dual-cavity filter structure and filter | |
| CN215344820U (en) | Electronic tuner | |
| CN219643097U (en) | TM mode dielectric resonator and TM mode dielectric filter | |
| CN102881970B (en) | Capacitive cross coupling device for coaxial cavity filter | |
| CN223672412U (en) | Display screen installing support | |
| CN220233424U (en) | Resonant rod assembly structure of miniaturized filter and miniaturized filter | |
| CN222763155U (en) | Filters and communication equipment | |
| KR102949340B1 (en) | Downsizing Cavity Type Wireless Frequency Filter |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |