Filter and capacitive coupling port structure thereof

Abstract

The invention relates to a filter and a capacitive coupling port structure thereof. The insertion part is arranged at one end of the anti-reverse piece, and the insertion part and the first resonant column are in limiting fit in the reverse direction of the anti-reverse piece, so that the anti-reverse piece can be stably arranged in the coupling hole, the anti-reverse piece can be prevented from being separated outwards, the installation stability of the anti-reverse piece on the first resonant column can be improved, and the reliability of the anti-reverse piece is improved. And meanwhile, the connecting conductor is fixed in the anti-reversing piece and is not easy to come out. Therefore, the connecting conductor and the anti-reverse piece are convenient to assemble and operate, the mounting stability of the connecting conductor and the anti-reverse piece on the first resonant column is relatively high, the port time delay consistency of the filter can be improved, and the stability of the product is relatively high.

Description

Technical Field

[0001] The present application relates to the field of radio frequency communication technology, and in particular to a filter and a capacitive coupling port structure thereof. Background Art

[0002] With the development of 5G communication, the application of filters, as an important RF filtering unit in communication equipment, has become increasingly important. With the integration of 5G active antennas, the integration of filters has become higher and the size has become smaller. As a result, mini cavity filters or sheet metal filters mounted on the PCB surface have appeared, and this filter no longer has a coaxial connector.

[0003] To design a high-performance filter product in a limited space, especially when the insertion loss index is relatively high, the volume size of the filter single cavity needs to be as large as possible, which results in a small operating space for the filter port structure. In related technologies, the filter port usually includes the following two methods:

[0004] Method 1: Use a coupling plate installed at the bottom of the resonant column, then bend and weld it to the PIN of the port structure to achieve different port bandwidths. However, especially when facing large bandwidth port delays, the coupling plate needs to be designed to be bent and widened. The design of the coupling plate is relatively complex, and it is difficult to install and weld in a small space, which in turn affects the electrical performance of the filter.

[0005] Method 2: A coupling hole is set on the resonant column, and the port structure of the filter includes an anti-backward part, a connecting conductor and a connector. The anti-backward part is set in the coupling hole, one end of the connecting conductor extends into the anti-backward part to directly couple with the resonant column, and the other end of the connecting conductor is connected to the connector. However, although the operability is improved to a certain extent, the port delay consistency of the filter is poor, and the stability of the product is poor. Summary of the invention

[0006] Based on this, it is necessary to overcome the defects of the prior art and provide a filter and a capacitive coupling port structure thereof, which can improve the consistency of port delay and improve the stability of the product.

[0007] A capacitive coupling port structure of a filter, the capacitive coupling port structure comprising:

[0008] A first resonant column, the first resonant column is used to be fixedly arranged inside the resonant cavity, and the first resonant column is provided with a coupling hole;

[0009] An anti-backward member, wherein an insertion portion is provided at one end of the anti-backward member, the insertion portion is inserted into the interior of the coupling hole, and the insertion portion cooperates with the first resonant column in an upper limit position along the back-moving direction of the anti-backward member; and

[0010] A connecting conductor is fixedly arranged inside the anti-backward component, and the connecting conductor is coupled to the first resonant column.

[0011] In one of the embodiments, the inserting portion includes at least two elastic clamping members, all of which are arranged in sequence around the circumference of the anti-backward member, and each of the elastic clamping members is matched with the inner wall of the coupling hole.

[0012] In one embodiment, the connecting conductor is in close contact with the inner wall of the anti-backward component, so that at least two of the elastic retaining components expand outward and cooperate with the inner wall of the coupling hole.

[0013] In one embodiment, the coupling hole is set as a through hole, and the end of the elastic clamp is provided with an anti-retraction hook, the anti-retraction hook extends out of the coupling hole and cooperates with the first resonant column to limit the position along the retraction direction; or, the coupling hole is set as a blind hole, the outer wall of the elastic clamp is provided with a first clamping portion, and the inner wall of the coupling hole is provided with a second clamping portion, and the first clamping portion is engaged with the second clamping portion.

[0014] In one embodiment, when the coupling hole is set as a through hole, the coupling hole includes an assembly hole and an adjustment hole which are sequentially connected along the retreat direction, the insertion portion is inserted into the assembly hole, the anti-backward component also includes a main body section connected to the insertion portion, the main body section is inserted into the adjustment hole, and the aperture of the adjustment hole is larger than the aperture of the assembly hole.

[0015] In one embodiment, a first positioning head is provided at the other end of the anti-backward member, and the first positioning head is used to be inserted into the first mounting hole of the resonance cavity, and the first positioning head is limitedly cooperated with the resonance cavity along the insertion direction of the anti-backward member.

[0016] In one of the embodiments, a first boss is disposed around the outer wall of the first positioning head, and the first boss cooperates with a second boss on the inner wall of the first mounting hole to limit the insertion direction.

[0017] In one of the embodiments, an anti-backward barb is provided on the outer wall of the connecting conductor, and the anti-backward barb cooperates with the anti-backward member to limit the position along the backward direction of the connecting conductor.

[0018] In one embodiment, the anti-retraction barbs are provided in plurality, and the plurality of anti-retraction barbs are sequentially spaced around the circumference of the connecting conductor.

[0019] In one embodiment, a second positioning head is provided at one end of the connecting conductor away from the first resonant column, and the second positioning head is arranged inside the anti-backward component. The second positioning head cooperates with the anti-backward component in a limiting manner along the insertion direction of the connecting conductor.

[0020] In one embodiment, a third boss is disposed on the outer wall of the second positioning head, and a fourth boss is disposed on the inner wall of the anti-backward member. The third boss cooperates with the fourth boss in limiting the insertion direction.

[0021] A filter comprises the capacitive coupling port structure, the filter also comprises a resonant cavity and a cover plate, the cover plate is arranged at the mouth of the resonant cavity, and the first resonant column is fixedly arranged inside the resonant cavity.

[0022] In one embodiment, the filter further includes a first tuning component, which is disposed on the cover plate. The first tuning component includes a first tuning piece whose position can be adjusted up and down. The first resonant column is provided with a first tuning hole, and the first tuning piece is disposed correspondingly to the position of the first tuning hole.

[0023] In one embodiment, there are two capacitive coupling port structures, and the two capacitive coupling port structures are an input port structure and an output port structure respectively.

[0024] In one embodiment, the first resonant column is connected to the bottom wall of the resonant cavity and is configured as an integrated structure.

[0025] In one embodiment, the filter also includes a second tuning component, which is arranged on the cover plate, and the second tuning component includes a second tuning piece whose position can be adjusted up and down, a second resonant column is provided inside the resonant cavity, and the second resonant column is provided with a second tuning hole, and the second tuning piece is arranged corresponding to the position of the second tuning hole.

[0026] In one of the embodiments, the filter further comprises a fastener, a protrusion is provided on the bottom wall of the resonance cavity, and the second resonance column is fixedly mounted on the protrusion via the fastener.

[0027] The capacitive coupling port structure of the above-mentioned filter has an insertion portion at one end of the anti-backward member, and the insertion portion cooperates with the first resonant column in the upper limit position along the back-off direction of the anti-backward member, so that the anti-backward member can be firmly installed inside the coupling hole, and the anti-backward member can be prevented from falling out, thereby improving the installation stability of the anti-backward member on the first resonant column, and at the same time, the connecting conductor is fixed inside the anti-backward member and will not fall out easily. It can be seen that the connecting conductor and the anti-backward member are not only easy to assemble, but also have a high installation stability on the first resonant column, which can improve the consistency of the port delay of the filter, and the stability of the product is high. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 FIG. 4 is a structural diagram of a filter according to an embodiment of the present application.

[0029] Figure 2 for Figure 1 Bottom view of the structure shown.

[0030] Figure 3 for Figure 1 Cross-sectional view of the structure shown Figure 1 .

[0031] Figure 4 for Figure 3 Schematic diagram of the enlarged structure at A.

[0032] Figure 5 for Figure 1 Cross-sectional view of the structure shown Figure 2 .

[0033] Figure 6 for Figure 5 Enlarged structural diagram at B.

[0034] 10. Capacitive coupling port structure; 11. First resonant column; 111. Coupling hole; 1111. Assembly hole; 1112. Adjustment hole; 112. First tuning hole; 12. Anti-recoil member; 121. Main body section; 122. Insertion portion; 1221. Elastic clamping member; 12211. Anti-recoil hook; 123. First positioning head; 1231. First boss; 1232. Second mounting hole; 1233. Fourth boss; 13. Connecting conductor ; 131, anti-retraction barb; 132, second positioning head; 1321, third boss; 20, resonant cavity; 21, first mounting hole; 211, second boss; 22, protrusion; 30, cover; 40, first tuning component; 41, first tuning part; 42, first adjusting nut; 50, second tuning component; 51, second tuning part; 52, second adjusting nut; 60, second resonant column; 61, second tuning hole; 70, fastener. DETAILED DESCRIPTION

[0035] In order to make the above-mentioned purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are described in detail below in conjunction with the accompanying drawings. In the following description, many specific details are set forth to facilitate a full understanding of the present application. However, the present application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without violating the connotation of the present application, so the present application is not limited by the specific embodiments disclosed below.

[0036] See also Figures 1 to 4 , Figure 1 A structural diagram of a filter according to an embodiment of the present application is shown. Figure 2 Shows Figure 1 Bottom view of the structure shown. Figure 3 Shows Figure 1 Cross-sectional view of the structure shown Figure 1 . Figure 4 Shows Figure 3 A schematic diagram of the enlarged structure at A. A capacitive coupling port structure 10 of a filter provided in one embodiment of the present application includes: a first resonant column 11, an anti-backward member 12 and a connecting conductor 13. The first resonant column 11 is used to be fixedly arranged inside the resonant cavity 20, and the first resonant column 11 is provided with a coupling hole 111. An end of the anti-backward member 12 is provided with an insertion portion 122.

[0037] Specifically, the anti-backward member 12 includes a main body section 121 and an insertion portion 122 connected to the first end of the main body section 121. The insertion portion 122 includes at least two elastic clamping members 1221, all of which are connected to the first end and arranged in sequence around the circumference of the first end. The insertion portion 122 and the main body section 121 are both inserted into the interior of the coupling hole 111, and each elastic clamping member 1221 is matched with the inner wall of the coupling hole 111, specifically, for example, tightly abutting against the inner wall of the coupling hole 111. The insertion portion 122 is matched with the first resonant column 11 in the upper limit position along the back-off direction of the anti-backward member 12.

[0038] Optionally, the material of the anti-backward member 12 is, for example, a dielectric material.

[0039] The connecting conductor 13 is fixedly disposed inside the anti-backward member 12 and, for example, closely abuts against the inner wall of the anti-backward member 12, so that at least two elastic clamping members 1221 expand outward and form a fit with the inner wall of the coupling hole 111. The connecting conductor 13 is coupled to the first resonant column 11.

[0040] It should be noted that the retraction direction of the anti-retraction member 12 in this embodiment refers to the opposite direction of the insertion direction of the anti-retraction member 12 into the coupling hole 111 .

[0041] Optionally, the connecting conductor 13 includes but is not limited to a pin, a coupling rod or other types of electrical connectors.

[0042] The capacitive coupling port structure 10 of the filter described above, on the one hand, since the anti-backward member 12 includes a main body section 121 and an insertion portion 122 connected to the first end of the main body section 121, the insertion portion 122 includes at least two elastic clamping members 1221, so that during assembly, when the insertion portion 122 is inserted into the coupling hole 111, each elastic clamping member 1221 can be compressed accordingly, so that the insertion portion 122 is smoothly inserted into the coupling hole 111; on the other hand, each elastic clamping member 1221 is matched with the inner wall of the coupling hole 111, and the insertion portion 122 is in contact with the first resonant column. 11 cooperates with the upper limit position along the retreat direction of the anti-backward member 12, so that the anti-backward member 12 can be firmly installed inside the coupling hole 111, and the anti-backward member 12 can be prevented from falling out; in addition, after the connecting conductor 13 is installed inside the anti-backward member 12, the connecting conductor 13 is tightly abutted against the inner wall of the anti-backward member 12, so that at least two elastic clamping members 1221 expand outward and form a match with the inner wall of the coupling hole 111, thereby improving the installation stability of the anti-backward member 12 on the first resonance column 11, and at the same time, the connecting conductor 13 is fixed inside the anti-backward member 12 and will not easily fall out. It can be seen that the connecting conductor 13 and the anti-backward member 12 are not only convenient for assembly operation, but also have high installation stability on the first resonance column 11, which can improve the port delay consistency of the filter and the stability of the product.

[0043] In some embodiments, the coupling hole 111 can be set as a through hole or a blind hole, which is not limited here. Through simulation analysis, it can be known that no matter the coupling hole 111 is a through hole or a blind hole, by adjusting the size of the coupling hole 111, such as adjusting the depth size and / or inner diameter size of the coupling hole 111, the size of the port delay can be adjusted accordingly. In addition, by adjusting the size of the connecting conductor 13, such as adjusting the length size and / or outer diameter size of the connecting conductor 13, the size of the port delay can also be adjusted accordingly. It can be seen that a solution to the port delay requirements of different bandwidths in the 5G filter can be realized, and a large bandwidth port of more than 800MHz can be achieved in the 3.5GHz band.

[0044] When the coupling hole 111 is set as a through hole, an end of the elastic clamping member 1221 away from the main section 121 is provided with an anti-backward hook 12211, which extends out of the coupling hole 111 and cooperates with the first resonant column 11 in the upper limit position along the backward direction. In this way, the anti-backward hook 12211 plays a limiting role and can prevent the anti-backward member 12 from escaping from the inside of the coupling hole 111.

[0045] Specifically, in the process of inserting the anti-backward component 12 into the coupling hole 111, the anti-backward hook 12211 first enters the interior of the coupling hole 111, and adaptively elastically deforms and contracts inward when contacting the inner wall of the coupling hole 111, so that the insertion portion 122 can be smoothly inserted into the interior of the coupling hole 111; after the anti-backward hook 12211 extends out of the coupling hole 111, the anti-backward hook 12211 can be reset under the action of its own elastic force, and cooperate with the first resonant column 11 in the upper limit position along the backward direction.

[0046] On the basis of the above-mentioned embodiment, the outer wall of the anti-backward hook 12211 is provided with a first guiding slope. The distance between the first guiding slope and the central axis of the anti-backward member 12 gradually decreases along the insertion direction. In this way, under the guiding effect of the first guiding slope, the anti-backward hook 12211 can be easily inserted into the coupling hole 111.

[0047] On the basis of the above-mentioned embodiment, the inserting portion 122 is formed with a cutting groove, and the cutting groove is extended from the end surface of the inserting portion 122 away from the main body section 121 along the central axis direction of the anti-backward member 12, so that the inserting portion 122 is divided into at least two elastic clamping members 1221. Optionally, when there is one cutting groove, the inserting portion 122 includes two elastic clamping members 1221; when there are two cutting grooves, for example, they are arranged in a cross shape and cross each other, the inserting portion 122 includes four elastic clamping members 1221; when there are four cutting grooves, for example, they are arranged in a cross shape and cross each other, the inserting portion 122 includes six elastic clamping members 1221.

[0048] Of course, as some optional schemes, the coupling hole 111 is not limited to the through hole in the above embodiment, and can also be, for example, a blind hole. When the coupling hole 111 is set as a blind hole, the elastic clamping member 1221 does not need to be provided with an anti-backward hook 12211 at one end away from the main body section 121. Specifically, a first clamping portion is provided on the outer wall of the elastic clamping member 1221, and a second clamping portion is provided on the inner wall of the coupling hole 111, and the first clamping portion is engaged with the second clamping portion. In this way, under the clamping action of the first clamping portion and the second clamping portion, the anti-backward member 12 can be firmly installed inside the coupling hole 111 to prevent the anti-backward member 12 from falling out. Optionally, the first clamping portion is, for example, a clamping block or a clamping hole, and the second clamping portion is correspondingly a clamping hole or a clamping block.

[0049] When the coupling hole 111 is set as a through hole, the inner diameter of each position of the coupling hole 111 along the central axis direction can be kept constant. Figure 6 The coupling hole 111 at the left side of the figure can also be different, as shown in FIG. Figure 6 The coupling hole 111 is located at the right side of the figure; the specific shape of the coupling hole 111 can be flexibly adjusted according to actual needs and is not limited here.

[0050] See also Figures 4 to 6 In a specific embodiment, when the coupling hole 111 is set as a through hole, the coupling hole 111 includes an assembly hole 1111 and an adjustment hole 1112 which are sequentially connected and arranged along the retreat direction. The insertion portion 122 is inserted into the assembly hole 1111, and the main body section 121 is inserted into the adjustment hole 1112. The aperture of the adjustment hole 1112 is larger than the aperture of the assembly hole 1111. In this way, the assembly hole 1111 can be equipped with the insertion portion 122, so that the insertion portion 122 and the first resonant column 11 can be matched with the upper limit position along the retreat direction of the anti-backward member 12; in addition, when it is necessary to adjust the port delay, the aperture size and / or the depth S of the adjustment hole 1112 can be adjusted, and the adjustment operation is more convenient and more feasible; in addition, since the port delay can be adjusted without adjusting the aperture size of the assembly hole 1111, it is not necessary to adjust the outer diameter size of the anti-backward member 12, so that the adjustment operation efficiency is higher.

[0051] The adjustment hole 1112 can be a straight through hole with a constant inner diameter, so that the coupling hole 111 formed by the combination of the adjustment hole 1112 and the assembly hole 1111 is in a step shape. Figure 6 The coupling hole 111 shown on the right; the adjustment hole 1112 can also be a non-through hole with a variable inner diameter, such as a conical hole or a hole of an irregular shape. The specific shape of the adjustment hole 1112 is not specifically limited here, as long as the material of the inner wall of the adjustment hole 1112 is removed or increased to meet the flexible adjustment of the port delay.

[0052] It should be noted that the "anti-backward hook 12211" can be a "part of the elastic clamping member 1221", that is, the "anti-backward hook 12211" and the "other parts of the elastic clamping member 1221" are manufactured as one piece; it can also be an independent component separable from the "other parts of the elastic clamping member 1221", that is, the "anti-backward hook 12211" can be manufactured independently and then combined with the "other parts of the elastic clamping member 1221" into a whole.

[0053] See also Figure 4 and Figure 6In one embodiment, the anti-backward member 12 also includes a first positioning head 123. The first positioning head 123 is connected to the second end of the main body section 121, and the first positioning head 123 is used to be inserted into the first mounting hole 21 of the resonance cavity 20, and the first positioning head 123 is limitedly matched with the resonance cavity 20 along the insertion direction of the anti-backward member 12. In this way, since the insertion portion 122 is limitedly matched with the first resonance column 11 along the retreat direction of the anti-backward member 12, the first positioning head 123 is limitedly matched with the resonance cavity 20 along the insertion direction of the anti-backward member 12, thereby effectively preventing the anti-backward member 12 from moving relative to the first resonance column 11, which can improve the installation stability of the anti-backward member 12, thereby making the port delay consistency higher and the product stability improved.

[0054] In one embodiment, a first boss 1231 is formed around the outer wall of the first positioning head 123 , and the first boss 1231 cooperates with the second boss 211 on the inner wall of the first mounting hole 21 to limit the insertion direction.

[0055] Specifically, the first mounting hole 21 is configured as a countersunk hole, and the first positioning head 123 is adapted to the first mounting hole 21. Thus, when the first positioning head 123 is located inside the first mounting hole 21, the stability is high, and the first positioning head 123 can be prevented from being offset.

[0056] In one embodiment, an anti-backward barb 131 is provided on the outer wall of the connection conductor 13, and the anti-backward barb 131 cooperates with the anti-backward member 12 to limit the position in the backward direction of the connection conductor 13. In this way, the anti-backward barb 131 plays a limiting role, which can prevent the connection conductor 13 from escaping from the inside of the anti-backward member 12 along the backward direction, so that the connection conductor 13 is stably arranged inside the anti-backward member 12, thereby improving the consistency of the port delay.

[0057] It should be noted that the "anti-backward barb 131" can be "a part of the connecting conductor 13", that is, the "anti-backward barb 131" and the "other parts of the connecting conductor 13" are manufactured as one piece; it can also be an independent component separable from the "other parts of the connecting conductor 13", that is, the "anti-backward barb 131" can be manufactured independently and then combined with the "other parts of the connecting conductor 13" into a whole.

[0058] The anti-backward barb 131 is provided with a second guiding slope, and the distance between the second guiding slope and the central axis of the connecting conductor 13 gradually decreases along the insertion direction. In this way, under the guiding effect of the second guiding slope, the connecting conductor 13 can be easily inserted into the anti-backward member 12, and can be prevented from being separated from the anti-backward member 12 along the backward direction.

[0059] In one embodiment, the anti-backward barbs 131 are provided in plurality, and the plurality of anti-backward barbs 131 are sequentially arranged at intervals around the outer circumference of the connecting conductor 13. In this way, the plurality of anti-backward barbs 131 play a limiting role, and can effectively prevent the connecting conductor 13 from escaping from the anti-backward member 12 along the backward direction.

[0060] Of course, as some optional solutions, only one anti-retraction barb 131 is required. Specifically, the anti-retraction barb 131 is extended around the outer circumference of the connecting conductor 13 .

[0061] See also Figure 4 and Figure 6 In one embodiment, a second positioning head 132 is provided at one end of the connecting conductor 13 away from the first resonant column 11. The second positioning head 132 is arranged inside the anti-backward member 12, and the second positioning head 132 is limitedly matched with the anti-backward member 12 along the insertion direction of the connecting conductor 13. In this way, since the anti-backward barb 131 is limitedly matched with the anti-backward member 12 along the retreat direction, the second positioning head 132 is limitedly matched with the anti-backward member 12 along the insertion direction of the connecting conductor 13, thereby effectively preventing the connecting conductor 13 from moving relative to the anti-backward member 12, and can improve the installation stability of the connecting conductor 13 inside the anti-backward member 12, thereby making the port delay consistency higher and the product stability improved. In addition, the second positioning head 132 plays a positioning role, preventing the connecting conductor 13 from continuing to be inserted into the anti-backward member 12, so that the end face position of the second positioning head 132 is accurate, which can facilitate surface mounting on the circuit board.

[0062] Optionally, the end surface of the second positioning head 132 is flush with the outer wall of the resonant cavity 20, so that it can be easily and firmly mounted on the circuit board. Of course, when the capacitive coupling port structure 10 is provided with a connector, the second positioning head 132 is connected to the connector.

[0063] In a specific embodiment, when the anti-backward member 12 includes a first positioning head 123 and the connecting conductor 13 is provided with a second positioning head 132, the second positioning head 132 is installed inside the first positioning head 123, and the second positioning head 132 cooperates with the first positioning head 123 in the upper limit position along the insertion direction of the connecting conductor 13.

[0064] In one embodiment, a third boss 1321 is disposed on the outer wall of the second positioning head 132 , and a fourth boss 1233 is disposed on the inner wall of the anti-backward member 12 . The third boss 1321 cooperates with the fourth boss 1233 in limiting position along the insertion direction.

[0065] Specifically, the first positioning head 123 is provided with a second mounting hole 1232, and the second mounting hole 1232 is specifically a countersunk hole. The second positioning head 132 is adapted to the second mounting hole 1232. In this way, when the second positioning head 132 is inside the second mounting hole 1232, the stability is high, and the second positioning head 132 can be prevented from being offset.

[0066] See also Figure 1 , Figure 3 and Figure 4 In one embodiment, another embodiment of the present application provides a filter, the filter includes the capacitive coupling port structure 10 of any of the above embodiments, and the filter also includes a resonant cavity 20 and a cover plate 30. The cover plate 30 is arranged at the mouth of the resonant cavity 20, and the first resonant column 11 is fixedly arranged inside the resonant cavity 20.

[0067] It should be noted that the resonant cavity 20 is made of metal material or a metal layer is provided on the inner wall and the outer wall of the dielectric shell.

[0068] In the above-mentioned filter, on the one hand, since the anti-backward member 12 includes a main body section 121 and an insertion portion 122 connected to the first end of the main body section 121, the insertion portion 122 includes at least two elastic clamping members 1221, so that during assembly, when the insertion portion 122 is inserted into the coupling hole 111, each elastic clamping member 1221 can be compressed accordingly, so that the insertion portion 122 is smoothly inserted into the coupling hole 111; on the other hand, each elastic clamping member 1221 is tightly abutted against the inner wall of the coupling hole 111, and the insertion portion 122 and the first resonant column 11 are in close contact with each other along the anti-backward direction. The upper limit position of the retreating part 12 can be matched, so that the anti-backward part 12 can be firmly installed inside the coupling hole 111, and the anti-backward part 12 can be prevented from falling out; in addition, after the connecting conductor 13 is installed inside the anti-backward part 12, the connecting conductor 13 is tightly abutted against the inner wall of the anti-backward part 12, so that at least two elastic clamping parts 1221 expand outward and tightly abut against the inner wall of the coupling hole 111, thereby improving the installation stability of the anti-backward part 12 on the first resonant column 11, and at the same time, the connecting conductor 13 is fixed inside the anti-backward part 12 and will not fall out easily. It can be seen that the connecting conductor 13 and the anti-backward part 12 are not only convenient for assembly operation, but also have high installation stability on the first resonant column 11, which can improve the port delay consistency of the filter and the stability of the product.

[0069] In one embodiment, the filter further includes a first tuning component 40, which is disposed on the cover plate 30. The first tuning component 40 includes a first tuning member 41 whose position is adjustable up and down. The first resonant column 11 is provided with a first tuning hole 112, and the first tuning member 41 is disposed correspondingly to the first tuning hole 112. Thus, when the first tuning member 41 of the first tuning component 40 is adjusted up and down, the depth of the first tuning member 41 extending into the first tuning hole 112 is changed, so that the resonant frequency of the filter can be adjusted.

[0070] The cover plate 30 is configured as a metal plate or a metalized dielectric plate. The first tuning member 41 includes but is not limited to a tuning screw or a tuning screw, and the first tuning member 41 is a metal member. The first tuning assembly 40 further includes a first adjusting nut 42 connected to the first tuning member 41. By rotating the first adjusting nut 42, the upper and lower positions of the first tuning member 41 can be adjusted accordingly.

[0071] In one embodiment, there are two capacitive coupling port structures 10 , and the two capacitive coupling port structures 10 are an input port structure and an output port structure respectively.

[0072] In one embodiment, the first resonant column 11 is connected to the bottom wall of the resonant cavity 20 and is configured as an integrated structure.

[0073] The bottom wall of the resonance cavity 20 refers to a portion of the inner wall of the resonance cavity 20 that is opposite to the cover plate 30 .

[0074] In one embodiment, the filter further includes a second tuning component 50, which is disposed on the cover plate 30. The second tuning component 50 includes a second tuning member 51 whose position is adjustable up and down. A second resonant column 60 is disposed inside the resonant cavity 20. The second resonant column 60 is provided with a second tuning hole 61. The second tuning member 51 is disposed in a position corresponding to the second tuning hole 61. In this way, when the second tuning member 51 of the second tuning component 50 is adjusted up and down, the depth of the second tuning member 51 extending into the second tuning hole 61 is changed, so that the resonant frequency of the filter can be adjusted.

[0075] In some embodiments, the number of the second resonant columns 60 is set to be multiple, and the number of the second tuning components 50 is correspondingly set to be multiple, and each second tuning component 50 is arranged correspondingly to each second resonant column 60. In this way, the filter can have multiple resonators.

[0076] In order to further adjust the resonant frequency, optionally, a tuning component may be provided between any two adjacent second resonant columns 60 .

[0077] In one embodiment, the filter further comprises a fastener 70 . A protrusion 22 is provided on the bottom wall of the resonant cavity 20 , and the second resonant column 60 is fixedly mounted on the protrusion 22 by the fastener 70 .

[0078] Optionally, the fastener 70 includes but is not limited to screws, threaded rods, pins, rivets, etc.

[0079] In the description of the present application, it should be understood that if the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. appear, the orientation or position relationship indicated by these terms is based on the orientation or position relationship shown in the accompanying drawings, which is only for the convenience of describing the present application and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application.

[0080] In addition, if the terms "first" or "second" appear, these terms are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of the features. In the description of this application, if the term "plurality" appears, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0081] In this application, unless otherwise clearly specified and limited, if the terms "installed", "connected", "connected", "fixed" and the like appear, these terms should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integrated connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to the specific circumstances.

[0082] In the present application, unless otherwise clearly specified and limited, if there is a description that a first feature is "above" or "below" a second feature, etc., or similar descriptions appear, it may mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediate medium. Moreover, the first feature being "above", "above" and "above" the second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. The first feature being "below", "below" and "below" the second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0083] It should be noted that if an element is referred to as being "fixed to" or "disposed on" another element, it may be directly on the other element or there may be a central element. If an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. If any, the terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used in this application are for illustrative purposes only and do not represent the only implementation method.

[0084] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0085] The above-described embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be construed as limiting the scope of the patent application. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the protection scope of the patent application shall be subject to the attached claims.

Claims

1. A capacitive coupling port structure of a filter, characterized in that: The capacitive coupling port structure comprises: A first resonant column, the first resonant column is used to be fixedly arranged inside the resonant cavity, and the first resonant column is provided with a coupling hole; An anti-backward member, wherein an insertion portion is provided at one end of the anti-backward member, the insertion portion is inserted into the interior of the coupling hole, and the insertion portion cooperates with the first resonant column in an upper limit position along the back-moving direction of the anti-backward member; and A connecting conductor is fixedly arranged inside the anti-backward component, and the connecting conductor is coupled to the first resonant column.

2. The capacitive coupling port structure according to claim 1, characterized in that: The inserting portion comprises at least two elastic clamping members, all of which are arranged in sequence around the circumference of the anti-backward member, and each of the elastic clamping members is matched with the inner wall of the coupling hole.

3. The capacitive coupling port structure according to claim 2, characterized in that: The connecting conductor is in close contact with the inner wall of the anti-backward component, so that at least two of the elastic clamping components expand outward and form a match with the inner wall of the coupling hole.

4. The capacitive coupling port structure according to claim 3, characterized in that: The coupling hole is set as a through hole, and the end of the elastic clamp is provided with an anti-retraction hook, the anti-retraction hook extends out of the coupling hole and cooperates with the first resonant column to limit the position along the retreat direction; or, the coupling hole is set as a blind hole, the outer wall of the elastic clamp is provided with a first clamping part, and the inner wall of the coupling hole is provided with a second clamping part, and the first clamping part is engaged with the second clamping part.

5. The capacitive coupling port structure according to claim 4, characterized in that: When the coupling hole is set as a through hole, the coupling hole includes an assembly hole and an adjustment hole which are sequentially connected along the retreat direction, the insertion part is inserted into the assembly hole, and the anti-backward component also includes a main body section connected to the insertion part, the main body section is inserted into the adjustment hole, and the aperture of the adjustment hole is larger than the aperture of the assembly hole.

6. The capacitive coupling port structure according to claim 1, characterized in that: A first positioning head is provided at the other end of the anti-backward member. The first positioning head is used to be inserted into the first mounting hole of the resonance cavity. The first positioning head cooperates with the resonance cavity in a limiting manner along the insertion direction of the anti-backward member.

7. The capacitive coupling port structure according to claim 6, characterized in that: A first boss is disposed around the outer wall of the first positioning head, and the first boss cooperates with a second boss on the inner wall of the first mounting hole for upper limit positioning along the insertion direction.

8. The capacitive coupling port structure according to claim 1, characterized in that: The outer wall of the connecting conductor is provided with an anti-backward barb, and the anti-backward barb cooperates with the anti-backward member to limit the position along the backward direction of the connecting conductor.

9. The capacitive coupling port structure according to claim 8, characterized in that: The anti-retraction barbs are provided in plurality, and the plurality of anti-retraction barbs are sequentially arranged at intervals around the outer circumference of the connecting conductor.

10. The capacitive coupling port structure according to claim 1, characterized in that: A second positioning head is provided at one end of the connecting conductor away from the first resonant column. The second positioning head is arranged inside the anti-backward component. The second positioning head cooperates with the anti-backward component in a limiting manner along the insertion direction of the connecting conductor.

11. The capacitive coupling port structure according to claim 10, characterized in that: A third boss is disposed around the outer wall of the second positioning head, and a fourth boss is disposed around the inner wall of the anti-backward component. The third boss cooperates with the fourth boss in limiting position along the insertion direction.

12. A filter, characterized in that: The filter comprises the capacitive coupling port structure as described in any one of claims 1 to 11, and the filter further comprises a resonant cavity and a cover plate, wherein the cover plate is arranged at the mouth of the resonant cavity, and the first resonant column is fixedly arranged inside the resonant cavity.

13. The filter according to claim 12, characterized in that The filter also includes a first tuning component, which is arranged on the cover plate. The first tuning component includes a first tuning piece whose position can be adjusted up and down. The first resonant column is provided with a first tuning hole. The first tuning piece is arranged corresponding to the position of the first tuning hole.

14. The filter according to claim 12, characterized in that There are two capacitive coupling port structures, and the two capacitive coupling port structures are an input port structure and an output port structure respectively.

15. The filter according to claim 12, characterized in that The first resonant column is connected to the bottom wall of the resonant cavity and is configured as an integrated structure.

16. The filter according to claim 12, characterized in that The filter also includes a second tuning component, which is arranged on the cover plate. The second tuning component includes a second tuning piece whose position can be adjusted up and down. A second resonant column is arranged inside the resonant cavity. The second resonant column is provided with a second tuning hole. The second tuning piece is arranged corresponding to the position of the second tuning hole.

17. The filter according to claim 16, characterized in that The filter further comprises a fastener, a protrusion is provided on the bottom wall of the resonance cavity, and the second resonance column is fixedly mounted on the protrusion through the fastener.

Images