Double-sided coupling structure of band elimination filter

Abstract

The invention discloses a double-sided coupling structure of a band elimination filter, and belongs to the field of band elimination filters. A double-sided coupling structure of a band elimination filter comprises a cavity and further comprises an input connector and an output connector which are fixedly arranged on the two sides of the cavity, and the input connector and the output connector are connected with an input core rod and an output core rod respectively. The partition plate is fixedly arranged on the inner wall of the cavity, an extending block is fixedly arranged in the middle of the partition plate, and placing cavities are formed between the extending block and the two side walls of the cavity; the whole copper sheet is of a square-frame-shaped structure, the copper sheet is connected into the containing cavity in a clamped mode, the extending-out block is arranged in a square frame of the copper sheet, and the input core rod and the output core rod are connected with the two ends of the copper sheet correspondingly; according to the invention, the coupling area between the resonant column and the copper sheet is increased, the coupling is enhanced, the minimum distance between the copper sheet and the resonant column is ensured, the power capacity of the product is improved, the processing and assembling precision and cost are reduced, the structure is simple, and the realization is relatively easy.

Description

Technical Field

[0001] This invention relates to the field of band-stop filter technology, and in particular to a double-sided coupling structure for a band-stop filter. Background Technology

[0002] A band-stop filter is a filter that can suppress or attenuate signals within a specific frequency band while allowing signals outside that band to pass relatively smoothly. From the perspective of frequency response, the signal amplitude will be significantly attenuated in its stopband (the frequency band that needs to be suppressed), while in the passband (the frequency band that allows the signal to pass), the signal can pass with almost no loss or only a small loss.

[0003] In the design and debugging of communication band-stop filters, conventional bandpass filters often fail to meet stringent requirements, necessitating the use of band-stop designs. However, due to the relatively wide bandwidth, strong coupling values ​​are required, making debugging sensitive and demanding high precision in manufacturing and assembly, resulting in significant debugging difficulties. Each individual resonant cavity in this type of band-stop filter requires a very strong coupling value. The only way to achieve this is to reduce the spacing between the copper plate and the resonant pillar, leading to a very small spacing between each resonant pillar and the copper plate. This results in insufficient power capacity, high precision requirements in manufacturing and assembly, and sensitivity to debugging, ultimately causing a significant increase in cost. Therefore, this invention is proposed to address these issues. Summary of the Invention

[0004] The purpose of this invention is to solve the problems existing in the prior art and to propose a double-sided coupling structure for a band-stop filter.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: A band-stop filter with dual-plane coupling structure includes a cavity and further includes: An input connector and an output connector are fixedly installed on both sides of the cavity. An input core rod and an output core rod are respectively connected to the input connector and the output connector. The input core rod and the output core rod are both inserted into the cavity. A partition is fixedly installed on the inner wall of the cavity, and a protruding block is fixedly installed in the middle part of the partition. The protruding block and the two side walls of the cavity form placement cavities. The copper sheet has a square frame structure, which is formed by four consecutively connected side frames. The copper sheet is snapped into place in the cavity. The protruding block is set inside the square frame of the copper sheet. The input core rod and the output core rod are respectively connected to the two ends of the copper sheet.

[0006] Preferably, there are two partitions, which divide the cavity into three resonant cavities. Each of the three resonant cavities has a resonant pillar, and each resonant pillar has a resonant hole.

[0007] Furthermore, the top of the cavity is provided with a cover plate, and the cover plate is provided with a tuning screw. The bottom of the tuning screw is placed inside the cavity, and one end of the tuning screw placed inside the cavity is inserted into the resonant hole.

[0008] Furthermore, there are three tuning screws, each corresponding to one of the three resonant holes. Each of the three tuning screws is provided with a tuning nut, which abuts against the outer wall of the cover plate.

[0009] Furthermore, the cover plate is also provided with a locking hole, in which a locking screw is installed. The cover plate is fixedly installed on the cavity by the locking screw. The cover plate is also provided with a mounting hole, in which the tuning screw is connected.

[0010] Furthermore, the top outer wall of the protruding block is flush with the top outer wall of the cavity, and both the protruding block and the outer wall of the cavity are provided with connecting holes, and one end of the locking screw that passes through the cover plate is connected to the connecting hole.

[0011] Preferably, the resonant pillars are square, and all three resonant pillars are placed within the square frame of the copper sheet.

[0012] Preferably, the placement cavity has a recessed hole, and the placement cavity has an annular support corresponding to the position of the recessed hole. The copper sheet is disposed on the annular support, and a limiting screw is connected to the copper sheet. The limiting screw passes through the copper sheet and the annular support and is connected in the recessed hole.

[0013] Furthermore, each end of the copper sheet is provided with two protrusions, and a welding groove is formed between the two protrusions. The input core rod and the output core rod are both connected in the welding groove.

[0014] Preferably, the cavity is connected to an input fixing plate and an output fixing plate at both ends, the input connector is connected to the input fixing plate, the output connector is connected to the output fixing plate, the input fixing plate is provided with an input fixing screw, the output fixing plate is provided with an output fixing screw, the cavity is provided with a first through hole and a second through hole on both sides, the input fixing screw and the output fixing screw are respectively connected to the second through hole on both sides of the cavity, and the input core rod and the output core rod pass through the first through hole and are placed in the cavity.

[0015] Compared with the prior art, the present invention provides a double-sided coupling structure for a band-stop filter, which has the following advantages: 1. This band-stop filter's double-sided coupling structure uses a rectangular copper sheet as its overall structure. The rectangular copper sheet is enclosed by four sequentially connected side borders. The copper sheet is connected to multiple placement cavities, forming a snap-fit ​​for initial fixation. The resonant post is located inside the rectangular copper sheet, allowing both sides of the resonant post to correspond to the copper sheet. This changes the coupling method to double-sided coupling via the resonant post on both sides. This method increases the coupling area between the resonant post and the copper sheet, thereby strengthening the coupling, ensuring a minimum spacing between the copper sheet and the resonant post, improving the product's power capacity, reducing processing and assembly precision and cost, and offering a simple and relatively easy-to-implement structure.

[0016] 2. This band-stop filter features a double-sided coupling structure. By adjusting the position of the tuning screw and tightening the tuning nut to abut against the outer wall of the cover plate, the tuning screw is fixed. The tuning screw can change the electromagnetic environment around the resonant pillar, thereby fine-tuning the resonant frequency of the resonant pillar. All three resonant pillars are set within a square frame formed by square copper sheets, which can increase the coupling area and effect.

[0017] 3. This band-stop filter features a double-sided coupling structure. First, the input and output fixing plates are attached to the outer walls of the cavity on both sides. Then, the input and output fixing plates are secured using input and output fixing screws. The input connector and output connector are integrally formed with each other. After installation, the input and output connectors are fixed. Simultaneously, the input and output core rods are inserted into the first through hole, thus fitting into the cavity and corresponding to the welding grooves on the copper sheet. Welding then secures the input and output core rods to the copper sheet, improving overall mechanical strength and further enhancing stable output.

[0018] The parts of the device not mentioned herein are the same as or can be implemented using existing technologies. The present invention changes the coupling method to double-sided coupling through both sides of the resonant column. This method increases the coupling area between the resonant column and the copper sheet, thereby strengthening the coupling, ensuring the minimum spacing between the copper sheet and the resonant column, improving the power capacity of the product, reducing the processing and assembly precision and cost, and the structure is simple and relatively easy to implement. It also increases the stability, consistency, reliability, operability and low cost. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of a double-sided coupling structure for a band-stop filter proposed in this invention; Figure 2 This is an exploded view of a double-sided coupling structure for a band-stop filter proposed in this invention. Figure 3 This is a schematic diagram of a double-sided coupling structure of a band-stop filter proposed in this invention, without a cover plate. Figure 4 This is a schematic diagram of the first and second through holes in a double-sided coupling structure of a band-stop filter proposed in this invention. Figure 5 This is a schematic diagram of the cavity structure in a double-sided coupling structure of a band-stop filter proposed in this invention; Figure 6 This is a cross-sectional schematic diagram of a double-sided coupling structure for a band-stop filter proposed in this invention; Figure 7 This invention proposes a double-sided coupling structure for a band-stop filter. Figure 3 Enlarged view of part A in the middle.

[0020] In the diagram: 1. Cavity; 101. Connecting hole; 102. Partition plate; 103. Protruding block; 104. Resonant cavity; 105. Placement cavity; 106. Resonant column; 107. Resonant hole; 108. First through hole; 109. Second through hole; 110. Concave hole; 2. Input fixing plate; 201. Input connector; 202. Input fixing screw; 203. Input core rod; 3. Output fixing plate; 301. Output connector; 302. Output fixing screw; 303. Output core rod; 4. Cover plate; 401. Locking screw; 402. Tuning screw; 403. Tuning nut; 404. Locking hole; 405. Mounting hole; 5. Copper sheet; 501. Protrusion; 502. Welding groove; 503. Annular support; 504. Limiting screw. Detailed Implementation

[0021] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0022] In the description of this invention, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0023] Example 1: Refer to Figures 1-7A band-stop filter with dual-sided coupling structure includes a cavity 1, an input connector 201 and an output connector 301 fixedly disposed on both sides of the cavity 1, an input core rod 203 and an output core rod 303 respectively connected to the input connector 201 and the output connector 301, and both the input core rod 203 and the output core rod 303 are inserted into the cavity 1; and a partition 102 fixedly disposed on the inner wall of the cavity 1, with an extension block 103 fixedly disposed in the middle part of the partition 102, forming placement cavities 105 between the extension block 103 and both side walls of the cavity 1; a copper sheet 5 is generally in the shape of a square frame, which is formed by four sequentially connected side frames, and the copper sheet 5 is engaged and connected to the placement cavity 105, with the extension block 103 disposed in the square frame of the copper sheet 5, and the input core rod 203 and the output core rod 303 respectively connected to the two ends of the copper sheet 5.

[0024] In this embodiment, during use, a signal can be input through the input connector 201. The input signal is then transmitted to the copper plate 5 through the input core 203. The copper plate 5 is a key component for the electrical connection between the filter and the external signal source. Its main function is to stably and reliably introduce the electrical signal from the signal source into the internal circuit of the filter, which can reduce signal reflection during transmission, improve signal transmission efficiency, and ensure that the power output by the signal source is transmitted to the filter to the maximum extent, avoiding signal power loss and waveform distortion. Then, after the signal is processed inside the filter, the pure signal that removes interference signals in a specific frequency band is transmitted through the output connector 301 to the subsequent circuits or devices, which can ensure that the filtered signal is output smoothly and stably from the filter.

[0025] Reference Figures 2-6 Two partitions 102 are provided, and the two partitions 102 divide the cavity 1 into three resonant cavities 104. Each of the three resonant cavities 104 is provided with a resonant pillar 106, and each resonant pillar 106 is provided with a resonant hole 107.

[0026] In this embodiment, the copper sheet 5 has a square frame structure, which is formed by four sequentially connected side frames. The copper sheet 5 is connected to multiple placement cavities 105, which can form a snap-fit ​​for initial fixation. The resonant post 106 is set inside the copper sheet 5 in the frame structure, so that both sides of the resonant post 106 can correspond to the copper sheet 5. This changes the coupling method to double-sided coupling through both sides of the resonant post 106. This method increases the coupling area between the resonant post 106 and the copper sheet 5, thereby strengthening the coupling, ensuring the minimum spacing between the copper sheet 5 and the resonant post 106, improving the power capacity of the product, reducing the processing and assembly accuracy and cost, and the structure is simple and relatively easy to implement. It also increases the stability, consistency, reliability, operability, and low cost.

[0027] Reference Figure 1 and Figure 2 The top of the cavity 1 is provided with a cover plate 4, and a tuning screw 402 is provided on the cover plate 4. The bottom of the tuning screw 402 is placed inside the cavity 1, and one end of the tuning screw 402 placed inside the cavity 1 is inserted into the resonant hole 107.

[0028] Reference Figure 1 and Figure 2 There are three tuning screws 402, which correspond to the positions of the three resonant holes 107 respectively. Each of the three tuning screws 402 is provided with a tuning nut 403, which abuts against the outer wall of the cover plate 4.

[0029] In this embodiment, three resonant pillars 106 are provided, and three tuning screws 402 are provided on the cover plate 4. When the tuning screws 402 are adjusted, the depth of the tuning screws 402 inserted into the cavity 1 can be adjusted, that is, the depth of the tuning screws 402 inserted into the resonant holes 107 can be adjusted. After the position of the tuning screws 402 is adjusted, the tuning nuts 403 are tightened so that they abut against the outer wall of the cover plate 4, thereby completing the fixing of the tuning screws 402, which is convenient for subsequent use. The electromagnetic environment around the resonant pillars 106 can be changed by the tuning screws 402, thereby fine-tuning the resonant frequency of the resonant pillars 106. The three resonant pillars 106 are all set in the square frame formed by the square copper sheet 5, which can increase the coupling area and effect.

[0030] Reference Figures 1-7 The cover plate 4 is also provided with a locking hole 404, and a locking screw 401 is installed in the locking hole 404. The cover plate 4 is fixedly installed on the cavity 1 by the locking screw 401. The cover plate 4 is provided with a mounting hole 405, and a tuning screw 402 is connected in the mounting hole 405.

[0031] Reference Figures 1-7 The top outer wall of the protruding block 103 is flush with the top outer wall of the cavity 1. Both the protruding block 103 and the outer wall of the cavity 1 are provided with connecting holes 101. The locking screw 401 passes through one end of the cover plate 4 and is connected to the connecting hole 101.

[0032] In this embodiment, during use, the cover plate 4 is first placed on the cavity 1, and then a locking screw 401 is connected to the mounting hole 405 on the cover plate 4, so that the locking screw 401 passes through the mounting hole 405 and is threadedly connected to the connecting hole 101 on the cavity 1, thereby fixing the cover plate 4. Multiple locking screws 401 are provided, which surround the outer circumference of the cavity 1 to ensure the fixing effect of the cover plate 4. A connecting hole 101 is also provided on the protruding block 103, and a corresponding locking screw 401 is also provided on the cover plate 4 to ensure the connection effect of the middle part of the cover plate 4, enhance the sealing performance between the cover plate 4 and the cavity 1, and ensure the subsequent use effect.

[0033] Example 2: Refer to Figures 1-7 A band-stop filter with dual-sided coupling structure includes a cavity 1, an input connector 201 and an output connector 301 fixedly disposed on both sides of the cavity 1, an input core rod 203 and an output core rod 303 respectively connected to the input connector 201 and the output connector 301, and both the input core rod 203 and the output core rod 303 are inserted into the cavity 1; and a partition 102 fixedly disposed on the inner wall of the cavity 1, with an extension block 103 fixedly disposed in the middle part of the partition 102, forming placement cavities 105 between the extension block 103 and both side walls of the cavity 1; a copper sheet 5 is generally in the shape of a square frame, which is formed by four sequentially connected side frames, and the copper sheet 5 is engaged and connected to the placement cavity 105, with the extension block 103 disposed in the square frame of the copper sheet 5, and the input core rod 203 and the output core rod 303 respectively connected to the two ends of the copper sheet 5.

[0034] Reference Figures 2-6 Two partitions 102 are provided, which divide the cavity 1 into three resonant cavities 104. Each of the three resonant cavities 104 is provided with a resonant post 106, and each resonant post 106 is provided with a resonant hole 107. Reference Figures 2-6 The resonant pillar 106 is square, and all three resonant pillars 106 are placed within the square frame of the copper sheet 5.

[0035] In this embodiment, the resonant post 106 is also square, which can increase the double-sided coupling area between its two sides and the square copper sheet 5, thereby improving the coupling effect, ensuring the minimum spacing between the copper sheet 5 and the resonant post 106, increasing the product power capacity, reducing processing and assembly precision and cost, and the structure is simple and easy to implement.

[0036] Reference Figures 2-6 The placement cavity 105 is provided with a recess 110, and the placement cavity 105 is provided with an annular support 503 corresponding to the position of the recess 110. The copper sheet 5 is disposed on the annular support 503, and a limiting screw 504 is connected to the copper sheet 5. The limiting screw 504 passes through the copper sheet 5 and the annular support 503 and is connected in the recess 110.

[0037] In this application, during installation, the annular support 503 is first placed in the placement cavity 105 so that it corresponds to the position of the recess 110 in the placement cavity 105. Then, the copper sheet 5 is placed on the annular support 503 and fixed by the limiting screw 504. The bottom of the limiting screw 504 is connected to the recess 110. It should be noted that the copper sheet 5 is also provided with a hole corresponding to the limiting screw 504 so that the limiting screw 504 can pass through.

[0038] Both the annular support 503 and the limiting screw 504 are made of non-metallic materials. Specifically, the annular support 503 is made of PEI material, and the limiting screw 504 is made of PEEK material. Non-metallic materials have good electrical insulation properties and will not introduce additional electromagnetic interference or change the electromagnetic environment of the copper sheet 5 during use. In filters, which are sensitive to the electromagnetic environment and require precise control of signal transmission and filtering effects, non-metallic components will not interfere with the electrical path, which helps to maintain a stable signal transmission state and ensure the normal realization of the filtering function.

[0039] Reference Figure 3 and Figure 7 Two protrusions 501 are provided at both ends of the copper sheet 5, and a welding groove 502 is formed between the two protrusions 501. The input core rod 203 and the output core rod 303 are both connected in the welding groove 502. The setting of the welding groove 502 makes it easy to install the input core rod 203 and the output core rod 303. Specifically, the input core rod 203 and the output core rod 303 are respectively welded in the welding groove 502 at both ends of the copper sheet 5, which makes the input and output operation more stable.

[0040] Reference Figures 1-6 The cavity 1 has an input fixing plate 2 and an output fixing plate 3 connected to its two ends respectively. The input connector 201 is connected to the input fixing plate 2, and the output connector 301 is connected to the output fixing plate 3. The input fixing plate 2 is provided with an input fixing screw 202, and the output fixing plate 3 is provided with an output fixing screw 302. The cavity 1 has a first through hole 108 and a second through hole 109 on both sides. The input fixing screw 202 and the output fixing screw 302 are respectively connected to the second through hole 109 on both sides of the cavity 1. The input core rod 203 and the output core rod 303 pass through the first through hole 108 and are placed inside the cavity 1.

[0041] In this invention, when installing the input connector 201 and the output connector 301, the input fixing plate 2 and the output fixing plate 3 are first attached to the outer walls of the two sides of the cavity 1, respectively. Then, the input fixing screw 202 is connected to the input fixing plate 2, so that it passes through the input fixing plate 2 and is connected to the second through hole 109 on the cavity 1. It should be noted that the second through hole 109 is a threaded hole, which can be locked with the input fixing screw 202 and the output fixing screw 302. Similarly, the output fixing screw 302 is passed through the output fixing plate 3 and connected to the second through hole 109 on the other side, thereby realizing the connection between the input fixing plate 2 and the output fixing plate 301. The fixing operation of 3 is as follows: the input connector 201 and the input fixing plate 2 are integrally formed, and the output connector 301 and the output fixing plate 3 are integrally formed. After the installation of the input fixing plate 2 and the output fixing plate 3 is completed, the input connector 201 and the output connector 301 can be fixed. At the same time, the input core rod 203 and the output core rod 303 are inserted into the first through hole 108, thereby inserting into the cavity 1 and corresponding to the position of the welding groove 502 on the copper sheet 5. At this time, through the welding operation, the input core rod 203 and the output core rod 303 can be fixedly connected to the copper sheet 5 for convenient subsequent use.

[0042] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A band-stop filter with dual-sided coupling structure, comprising a cavity (1), characterized in that, Also includes: An input connector (201) and an output connector (301) are fixedly installed on both sides of the cavity (1). An input core rod (203) and an output core rod (303) are respectively connected to the input connector (201) and the output connector (301). The input core rod (203) and the output core rod (303) are both inserted into the cavity (1). A partition (102) is fixedly installed on the inner wall of the cavity (1). A protruding block (103) is fixedly installed in the middle part of the partition (102). A placement cavity (105) is formed between the protruding block (103) and the two side walls of the cavity (1). The copper sheet (5) has a square frame structure. The square copper sheet (5) is surrounded by four side frames connected in sequence. The copper sheet (5) is engaged and connected in the placement cavity (105). The protruding block (103) is set in the square frame of the copper sheet (5). The input core rod (203) and the output core rod (303) are respectively connected to the two ends of the copper sheet (5).

2. The band-stop filter double-sided coupling structure according to claim 1, characterized in that, Two partitions (102) are provided, and the two partitions (102) divide the cavity (1) into three resonant cavities (104). Each of the three resonant cavities (104) is provided with a resonant column (106), and each resonant column (106) is provided with a resonant hole (107).

3. The band-stop filter double-sided coupling structure according to claim 2, characterized in that, The top of the cavity (1) is provided with a cover plate (4), and the cover plate (4) is provided with a tuning screw (402). The bottom of the tuning screw (402) is placed inside the cavity (1), and one end of the tuning screw (402) placed inside the cavity (1) is inserted into the resonant hole (107).

4. The band-stop filter double-sided coupling structure according to claim 3, characterized in that, There are three tuning screws (402), and the three tuning screws (402) correspond to the positions of the three resonant holes (107) respectively. Each of the three tuning screws (402) is provided with a tuning nut (403), and the tuning nut (403) abuts against the outer wall of the cover plate (4).

5. The band-stop filter double-sided coupling structure according to claim 4, characterized in that, The cover plate (4) is also provided with a locking hole (404), and a locking screw (401) is installed in the locking hole (404). The cover plate (4) is fixedly installed on the cavity (1) by the locking screw (401). The cover plate (4) is provided with a mounting hole (405), and the tuning screw (402) is connected in the mounting hole (405).

6. The band-stop filter double-sided coupling structure according to claim 5, characterized in that, The top outer wall of the protruding block (103) is flush with the top outer wall of the cavity (1). Both the protruding block (103) and the outer wall of the cavity (1) are provided with connecting holes (101). The locking screw (401) passes through one end of the cover plate (4) and is connected to the connecting hole (101).

7. The band-stop filter double-sided coupling structure according to claim 2, characterized in that, The resonant pillar (106) is square, and all three resonant pillars (106) are placed within the square frame of the copper sheet (5).

8. The band-stop filter double-sided coupling structure according to claim 1, characterized in that, The placement cavity (105) is provided with a recess (110), and the placement cavity (105) is provided with an annular support (503) corresponding to the position of the recess (110). The copper sheet (5) is disposed on the annular support (503), and a limiting screw (504) is connected to the copper sheet (5). The limiting screw (504) passes through the copper sheet (5) and the annular support (503) and is connected in the recess (110).

9. A band-stop filter double-sided coupling structure according to claim 8, characterized in that, The copper sheet (5) has two protrusions (501) at both ends, and a welding groove (502) is formed between the two protrusions (501). The input core rod (203) and the output core rod (303) are both connected in the welding groove (502).

10. The band-stop filter double-sided coupling structure according to claim 1, characterized in that, The cavity (1) is connected to an input fixing plate (2) and an output fixing plate (3) at both ends respectively. The input connector (201) is connected to the input fixing plate (2), and the output connector (301) is connected to the output fixing plate (3). The input fixing plate (2) is provided with an input fixing screw (202), and the output fixing plate (3) is provided with an output fixing screw (302). The cavity (1) is provided with a first through hole (108) and a second through hole (109) on both sides. The input fixing screw (202) and the output fixing screw (302) are respectively connected in the second through hole (109) on both sides of the cavity (1). The input core rod (203) and the output core rod (303) pass through the first through hole (108) and are placed in the cavity (1).

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