Filter and its capacitive coupling port structure

Abstract

The application relates to a filter and a capacitive coupling port structure thereof. Since one end of the anti-back-off piece is provided with an insertion part which is limited and matched with the first resonant column in the back-off direction of the anti-back-off piece, the anti-back-off piece can be stably arranged in the coupling hole, the anti-back-off piece can be prevented from being taken out, the mounting stability of the anti-back-off piece on the first resonant column can be improved, and the connecting conductor is fixed in the anti-back-off piece and cannot be easily taken out. Therefore, the connecting conductor and the anti-back-off piece are convenient to assemble and operate, the mounting stability on the first resonant column is high, the port time delay consistency of the filter can be improved, and the stability of the product is high.

Description

Technical Field

[0001] This application relates to the field of radio frequency communication technology, and in particular to a filter and its capacitive coupling port structure. Background Technology

[0002] With the development of 5G communication, filters, as an important radio frequency filtering unit in communication equipment, are becoming increasingly important. As 5G active antennas are integrated into the overall system, filters are becoming more integrated and smaller. This has led to the emergence of PCB surface-mount mini-cavity filters or sheet metal filters, which no longer require coaxial connectors.

[0003] Designing high-performance filters within limited space, especially when high insertion loss requirements are needed, necessitates maximizing the size of each filter cavity, which in turn reduces the usable space for the filter's port structure. In related technologies, filter ports typically employ one of two methods:

[0004] Method 1 involves mounting a coupling plate to the bottom of the resonant pillar, then bending and soldering it to the PIN pins of the port structure to achieve different port bandwidths. However, especially when dealing with 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 installation, operation, and soldering in a confined space are difficult, which in turn affects the electrical performance of the filter.

[0005] Method 2 involves setting a coupling hole on the resonant pillar. The filter's port structure includes an anti-backlash component, a connecting conductor, and a connector. The anti-backlash component is housed within the coupling hole, and one end of the connecting conductor extends into the anti-backlash component for direct coupling to the resonant pillar. The other end of the connecting conductor connects to the connector. However, while this method improves operability to some extent, it results in poor port delay consistency and lower product stability. Summary of the Invention

[0006] Therefore, it is necessary to overcome the shortcomings of the existing technology and provide a filter and its capacitive coupling port structure, which can improve the consistency of port delay and improve the stability of the product.

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

[0008] The first resonant post is used to be fixedly installed inside the resonant cavity, and the first resonant post is provided with a coupling hole;

[0009] An anti-reverse component, one end of which is provided with an insertion portion, which is inserted into the coupling hole. The insertion portion and the first resonant post are in a maximum engagement along the retraction direction of the anti-reverse component.

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

[0011] In one embodiment, the insertion portion includes at least two elastic retaining members, all of which are arranged sequentially around the circumference of the anti-backward member, and each elastic retaining member is engaged with the inner wall of the coupling hole.

[0012] In one embodiment, the connecting conductor abuts tightly against the inner wall of the anti-backward member, such that at least two of the resilient retaining members expand outward and engage with the inner wall of the coupling hole.

[0013] In one embodiment, the coupling hole is a through hole, and the end of the elastic retaining member is provided with an anti-retraction hook. The anti-retraction hook extends out of the coupling hole and engages with the first resonant column at the upper limit along the retraction direction; or, the coupling hole is a blind hole, the outer wall of the elastic retaining member is provided with a first retaining part, and the inner wall of the coupling hole is provided with a second retaining part, and the first retaining part and the second retaining part engage with each other.

[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 that are sequentially connected along the retraction direction. The insertion part is inserted into the assembly hole. The anti-retraction component also includes a main body segment connected to the insertion part. The main body segment is inserted into the adjustment hole. The diameter of the adjustment hole is larger than the diameter of the assembly hole.

[0015] In one embodiment, the other end of the anti-reverse component is provided with a first positioning head, which is used to be inserted into the first mounting hole of the resonant cavity, and the first positioning head is matched with the resonant cavity in a limiting manner along the insertion direction of the anti-reverse component.

[0016] In one embodiment, a first boss is provided around the outer wall of the first positioning head, and the first boss and a second boss on the inner wall of the first mounting hole are engaged in a positioning engagement along the insertion direction.

[0017] In one embodiment, the outer wall of the connecting conductor is provided with anti-reverse barbs, which are engaged with the anti-reverse component in the retraction direction of the connecting conductor.

[0018] In one embodiment, the anti-backlash barbs are provided in a plurality of manner, and the plurality of anti-backlash barbs are arranged sequentially at intervals around the outer periphery of the connecting conductor.

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

[0020] In one embodiment, a third protrusion is provided around the outer wall of the second positioning head, and a fourth protrusion is provided around the inner wall of the anti-backward component. The third protrusion and the fourth protrusion are engaged in a limit engagement along the insertion direction.

[0021] A filter includes the capacitive coupling port structure, and further includes a resonant cavity and a cover plate. The cover plate is disposed at the opening of the resonant cavity, and the first resonant post is fixedly disposed inside the resonant cavity.

[0022] In one embodiment, the filter further includes a first tuning component disposed on the cover plate. The first tuning component includes a first tuning element whose position is adjustable up and down. The first resonant post is provided with a first tuning hole, and the first tuning element is positioned corresponding to the first tuning hole.

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

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

[0025] In one embodiment, the filter further includes a second tuning component disposed on the cover plate. The second tuning component includes a second tuning element whose position is adjustable up and down. A second resonant column is provided inside the resonant cavity. The second resonant column is provided with a second tuning hole. The second tuning element is positioned corresponding to the second tuning hole.

[0026] In one embodiment, the filter further includes a fastener, and a protrusion is provided on the bottom wall of the resonant cavity, wherein the second resonant column is fixedly mounted on the protrusion by the fastener.

[0027] The capacitive coupling port structure of the aforementioned filter features an insertion part at one end of the anti-backlash component. This insertion part engages with the first resonant post at its upper limit along the backlash direction of the anti-backlash component, ensuring the anti-backlash component is securely mounted inside the coupling hole and preventing it from detaching. This improves the mounting stability of the anti-backlash component on the first resonant post. Simultaneously, the connecting conductor is fixed inside the anti-backlash component and will not easily detach. Therefore, the connecting conductor and anti-backlash component not only facilitate assembly but also provide high mounting stability on the first resonant post, improving the port delay consistency of the filter and resulting in high product stability. Attached Figure Description

[0028] Figure 1 This is a structural diagram of a filter according to an embodiment of this application.

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

[0030] Figure 3 for Figure 1 The cross-sectional structure shown Figure 1 .

[0031] Figure 4 for Figure 3 A magnified structural diagram at point A.

[0032] Figure 5 for Figure 1 The cross-sectional structure shown Figure 2 .

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

[0034] 10. Capacitive coupling port structure; 11. First resonant post; 111. Coupling hole; 1111. Assembly hole; 1112. Adjustment hole; 112. First tuning hole; 12. Anti-backward component; 121. Main body section; 122. Insertion part; 1221. Elastic retaining component; 12211. Anti-backward hook; 123. First positioning head; 1231. First boss; 1232. Second mounting hole; 1233. Fourth boss; 13. Connecting conductor ; 131, Anti-reverse barb; 132, Second positioning head; 1321, Third boss; 20, Resonant cavity; 21, First mounting hole; 211, Second boss; 22, Protrusion; 30, Cover plate; 40, First tuning assembly; 41, First tuning component; 42, First adjusting nut; 50, Second tuning assembly; 51, Second tuning component; 52, Second adjusting nut; 60, Second resonant column; 61, Second tuning hole; 70, Fastener. Detailed Implementation

[0035] To make the above-mentioned objectives, features, and advantages of this application more apparent and understandable, the specific embodiments of this application are described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of this application. However, this application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of this application. Therefore, this application is not limited to the specific embodiments disclosed below.

[0036] See Figures 1 to 4 , Figure 1 A structural diagram of a filter according to an embodiment of this application is shown. Figure 2 It shows Figure 1 The bottom view of the structure shown. Figure 3 It shows Figure 1 The cross-sectional structure shown Figure 1 . Figure 4 It shows Figure 3 A magnified structural diagram at point A. An embodiment of this application provides a capacitive coupling port structure 10 for a filter. The capacitive coupling port structure 10 includes: a first resonant post 11, an anti-backlash member 12, and a connecting conductor 13. The first resonant post 11 is fixedly disposed inside the resonant cavity 20 and has a coupling hole 111. One end of the anti-backlash member 12 has an insertion portion 122.

[0037] Specifically, the anti-reverse component 12 includes a main body segment 121 and an insertion portion 122 connected to a first end of the main body segment 121. The insertion portion 122 includes at least two elastic retaining members 1221, all of which are connected to the first end and arranged sequentially around the first end in a circumferential direction. Both the insertion portion 122 and the main body segment 121 are inserted into the coupling hole 111, and each elastic retaining member 1221 forms a fit 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 and the first resonant post 11 are engaged in a stop fit along the retraction direction of the anti-reverse component 12.

[0038] Optionally, the material of the anti-reverse component 12 is, for example, a medium material.

[0039] The connecting conductor 13 is fixedly inserted inside the anti-reverse member 12 and, for example, tightly abuts against the inner wall of the anti-reverse member 12, so that at least two elastic retaining 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 post 11.

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

[0041] Optionally, the connecting conductor 13 may include, but is not limited to, a pin, a coupling rod, or other type of electrical connector.

[0042] The capacitive coupling port structure 10 of the aforementioned filter has the following advantages: Firstly, since the anti-backlash component 12 includes a main body segment 121 and an insertion portion 122 connected to the first end of the main body segment 121, and the insertion portion 122 includes at least two elastic retaining members 1221, during assembly, each elastic retaining member 1221 can be compressed accordingly during the insertion of the insertion portion 122 into the coupling hole 111, allowing the insertion portion 122 to be smoothly inserted into the coupling hole 111. Secondly, each elastic retaining member 1221 forms a fit with the inner wall of the coupling hole 111, and the insertion portion 122 and the first resonant post... The anti-reverse component 12 is positioned at the upper limit along its retraction direction, ensuring it is securely mounted inside the coupling hole 111 and preventing it from detaching. Furthermore, after the connecting conductor 13 is installed inside the anti-reverse component 12, it abuts tightly against the inner wall of the anti-reverse component 12, causing at least two elastic retaining members 1221 to expand outward and engage with the inner wall of the coupling hole 111. This improves the installation stability of the anti-reverse component 12 on the first resonant pillar 11, while the connecting conductor 13 remains fixed inside the anti-reverse component 12 and does not easily detach. Therefore, the connecting conductor 13 and the anti-reverse component 12 not only facilitate assembly but also provide high installation stability on the first resonant pillar 11, improving the port delay consistency of the filter and resulting in high product stability.

[0043] In some embodiments, the coupling hole 111 can be configured as either a through hole or a blind hole, without limitation. Simulation analysis shows that regardless of whether the coupling hole 111 is a through hole or a blind hole, the port delay can be adjusted by adjusting the size of the coupling hole 111, specifically, adjusting the depth and / or inner diameter of the coupling hole 111. Furthermore, the port delay can also be adjusted by adjusting the size of the connecting conductor 13, specifically, adjusting the length and / or outer diameter of the connecting conductor 13. Therefore, a solution can be provided to meet the port delay requirements of different bandwidths in 5G filters, and a large bandwidth port exceeding 800MHz can be achieved in the 3.5GHz band.

[0044] When the coupling hole 111 is configured as a through hole, the end of the elastic retaining member 1221 away from the main body section 121 is provided with an anti-retraction hook 12211. The anti-retraction hook 12211 extends out of the coupling hole 111 and engages with the first resonant post 11 in an upper limit engagement along the retraction direction. In this way, the anti-retraction hook 12211 plays a limiting role, preventing the anti-retraction member 12 from disengaging from the interior of the coupling hole 111.

[0045] Specifically, during the process of inserting the anti-reverse component 12 into the coupling hole 111, the anti-reverse hook 12211 first enters the interior of the coupling hole 111. When it comes into contact with the inner wall of the coupling hole 111, it adaptively deforms and contracts inward, so that the insertion part 122 can be smoothly inserted into the interior of the coupling hole 111. After the anti-reverse hook 12211 extends out of the coupling hole 111, the anti-reverse hook 12211 can be reset under its own elastic force and engage with the first resonant column 11 at the upper limit along the retraction direction.

[0046] Based on the aforementioned embodiment, the outer wall of the anti-reverse hook 12211 is provided with a first guide slope. The distance between the first guide slope and the central axis of the anti-reverse member 12 gradually decreases along the insertion direction. Thus, under the guiding action of the first guide slope, the anti-reverse hook 12211 can be easily inserted into the interior of the coupling hole 111.

[0047] Based on the aforementioned embodiment, the insertion portion 122 is formed with a cutting groove. The cutting groove extends from the end face of the insertion portion 122 away from the main body segment 121 along the central axis of the anti-backward member 12, thereby dividing the insertion portion 122 into at least two elastic retaining members 1221. Optionally, when there is one cutting groove, the insertion portion 122 includes two elastic retaining members 1221; when there are two cutting grooves, for example, arranged in a cross shape, the insertion portion 122 includes four elastic retaining members 1221; when there are four cutting grooves, for example, arranged in a star shape, the insertion portion 122 includes six elastic retaining members 1221.

[0048] Of course, as some optional solutions, the coupling hole 111 is not limited to the through hole in the above embodiments, but can also be, for example, a blind hole. When the coupling hole 111 is set as a blind hole, the end of the elastic retaining member 1221 away from the main body segment 121 does not need to be provided with an anti-reverse hook 12211. Specifically, the outer wall of the elastic retaining member 1221 is provided with a first retaining part, and the inner wall of the coupling hole 111 is provided with a second retaining part, and the first retaining part and the second retaining part are engaged. In this way, under the engaging action of the first retaining part and the second retaining part, the anti-reverse member 12 can be securely installed inside the coupling hole 111, preventing the anti-reverse member 12 from falling outward. Optionally, the first retaining part is, for example, a retaining block or a retaining hole, and the second retaining part is correspondingly a retaining hole or a retaining block.

[0049] When the coupling hole 111 is set as a through hole, the inner diameter of the coupling hole 111 at each position along its central axis can remain unchanged, specifically as follows: Figure 6 The coupling hole 111 on the left side of the image can also be different, for example, as shown below. Figure 6 The coupling hole 111 is located on the right side of the image. The shape of the coupling hole 111 can be flexibly adjusted according to actual needs and is not limited here.

[0050] Please see Figures 4 to 6 In one specific embodiment, when the coupling hole 111 is configured as a through hole, the coupling hole 111 includes an assembly hole 1111 and an adjustment hole 1112 sequentially connected along the retraction direction. The insertion part 122 is inserted into the assembly hole 1111, and the main body section 121 is inserted into the adjustment hole 1112, the diameter of which is larger than that of the assembly hole 1111. Thus, the assembly hole 1111 can accommodate the insertion part 122, achieving an upper limit fit between the insertion part 122 and the first resonant column 11 along the retraction direction of the anti-retraction member 12. Furthermore, when port delay needs adjustment, it can be achieved by adjusting the diameter and / or depth S of the adjustment hole 1112, making the adjustment operation convenient and highly feasible. Additionally, since port delay adjustment can be achieved without adjusting the diameter of the assembly hole 1111, and consequently without adjusting the outer diameter of the anti-retraction member 12, the adjustment operation efficiency is high.

[0051] The adjusting hole 1112 can be a straight hole with a constant inner diameter. In this case, the coupling hole 111 formed by the combination of the adjusting hole 1112 and the assembly hole 1111 has a stepped shape, as shown in the following example... 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 tapered hole or other irregularly shaped hole. 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 added to meet the flexible adjustment of the port delay.

[0052] It should be noted that the "anti-reverse hook 12211" can be a part of the "elastic retaining member 1221", that is, the "anti-reverse hook 12211" and the "other parts of the elastic retaining member 1221" are integrally molded; or it can be a separate component that can be separated from the "other parts of the elastic retaining member 1221", that is, the "anti-reverse hook 12211" can be manufactured independently and then combined with the "other parts of the elastic retaining member 1221" to form a whole.

[0053] Please see Figure 4 and Figure 6In one embodiment, the anti-reverse component 12 further includes a first positioning head 123. The first positioning head 123 is connected to the second end of the main body segment 121 and is used to insert into the first mounting hole 21 of the resonant cavity 20. The first positioning head 123 is in a limiting engagement with the resonant cavity 20 along the insertion direction of the anti-reverse component 12. Thus, since the insertion part 122 and the first resonant post 11 are in a limiting engagement along the retraction direction of the anti-reverse component 12, and the first positioning head 123 is in a limiting engagement with the resonant cavity 20 along the insertion direction of the anti-reverse component 12, the anti-reverse component 12 is effectively prevented from moving relative to the first resonant post 11, thereby improving the installation stability of the anti-reverse component 12, resulting in higher port delay consistency and improved product stability.

[0054] In one embodiment, a first boss 1231 is provided around the outer wall of the first positioning head 123, and the first boss 1231 and the second boss 211 on the inner wall of the first mounting hole 21 are engaged in the insertion direction.

[0055] Specifically, the first mounting hole 21 is countersunk. The first positioning head 123 is adapted to the first mounting hole 21. Thus, when the first positioning head 123 is inside the first mounting hole 21, the stability is high, and the first positioning head 123 can be prevented from shifting.

[0056] In one embodiment, the outer wall of the connecting conductor 13 is provided with an anti-retraction barb 131, which engages with the anti-retraction member 12 in an upper limit engagement along the retraction direction of the connecting conductor 13. Thus, the anti-retraction barb 131 acts as a limit, preventing the connecting conductor 13 from detaching from the interior of the anti-retraction member 12 in the retraction direction. This ensures that the connecting conductor 13 is stably positioned inside the anti-retraction member 12, thereby improving the consistency of port delay.

[0057] It should be noted that the "anti-reverse barb 131" can be "a part of the connecting conductor 13", that is, the "anti-reverse barb 131" is integrally molded with the "other parts of the connecting conductor 13"; or it can be a separate component that can be separated from the "other parts of the connecting conductor 13", that is, the "anti-reverse barb 131" can be manufactured independently and then combined with the "other parts of the connecting conductor 13" to form a whole.

[0058] The anti-reverse barb 131 is provided with a second guide slope, and the distance between the second guide slope and the central axis of the connecting conductor 13 gradually decreases along the insertion direction. In this way, under the guidance of the second guide slope, the connecting conductor 13 can be easily inserted into the interior of the anti-reverse member 12, while preventing it from coming out of the interior of the anti-reverse member 12 along the retraction direction.

[0059] In one embodiment, multiple anti-reverse barbs 131 are provided, and the multiple anti-reverse barbs 131 are arranged sequentially and at intervals around the outer periphery of the connecting conductor 13. In this way, the multiple anti-reverse barbs 131 play a limiting role and can effectively prevent the connecting conductor 13 from coming out of the anti-reverse member 12 in the retraction direction.

[0060] Of course, as an optional solution, only one anti-backlash barb 131 is required. Specifically, the anti-backlash barb 131 extends around the outer periphery of the connecting conductor 13.

[0061] Please see Figure 4 and Figure 6 In one embodiment, the end of the connecting conductor 13 furthest from the first resonant post 11 is provided with a second positioning head 132. The second positioning head 132 is disposed inside the anti-reverse member 12, and the second positioning head 132 is in a limiting engagement with the anti-reverse member 12 along the insertion direction of the connecting conductor 13. Thus, since the anti-reverse barb 131 is in a limiting engagement with the anti-reverse member 12 along the retraction direction, and the second positioning head 132 is in a limiting engagement with the anti-reverse member 12 along the insertion direction of the connecting conductor 13, the connecting conductor 13 is effectively prevented from moving relative to the anti-reverse member 12, which can improve the installation stability of the connecting conductor 13 inside the anti-reverse member 12, thereby resulting in higher port delay consistency and improved product stability. In addition, the second positioning head 132 plays a positioning role, preventing the connecting conductor 13 from being further inserted into the anti-reverse member 12, so that the end face of the second positioning head 132 is accurately positioned, which can facilitate surface mounting on the circuit board.

[0062] Optionally, the end face of the second positioning head 132 is flush with the outer wall of the resonant cavity 20, thereby facilitating a secure surface mount mounting on the circuit board. Of course, when the capacitive coupling port structure 10 is equipped with a connector, the second positioning head 132 is connected to the connector.

[0063] In one specific embodiment, when the anti-backward component 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 and the first positioning head 123 are in upper limit engagement along the insertion direction of the connecting conductor 13.

[0064] In one embodiment, a third boss 1321 is provided around the outer wall of the second positioning head 132, and a fourth boss 1233 is provided around the inner wall of the anti-backward member 12. The third boss 1321 and the fourth boss 1233 are engaged in a positioning engagement along the insertion direction.

[0065] Specifically, the first positioning head 123 is provided with a second mounting hole 1232, which is a countersunk hole. The second positioning head 132 is adapted to the second mounting hole 1232. Thus, 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 shifting.

[0066] Please see Figure 1 , Figure 3 and Figure 4 In one embodiment, another embodiment of this application provides a filter, which 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 disposed at the opening of the resonant cavity 20, and the first resonant post 11 is fixedly disposed inside the resonant cavity 20.

[0067] It should be noted that the resonant cavity 20 is made of metal or has metal layers on the inner and outer walls of the dielectric shell.

[0068] The aforementioned filter, on the one hand, includes a main body segment 121 and an insertion portion 122 connected to the first end of the main body segment 121. The insertion portion 122 includes at least two elastic retaining members 1221. During assembly, as the insertion portion 122 is inserted into the coupling hole 111, each elastic retaining member 1221 is correspondingly compressed, allowing the insertion portion 122 to be smoothly inserted into the coupling hole 111. On the other hand, each elastic retaining member 1221 is in close contact with the inner wall of the coupling hole 111, and the insertion portion 122 and the first resonant post 11 are aligned along the anti-reverse... The upper limit of the retraction direction of the anti-retraction component 12 ensures that it is securely installed inside the coupling hole 111, preventing it from detaching outwards. Furthermore, after the connecting conductor 13 is installed inside the anti-retraction component 12, it abuts tightly against the inner wall of the anti-retraction component 12, causing at least two elastic retaining members 1221 to expand outwards and abut tightly against the inner wall of the coupling hole 111. This improves the installation stability of the anti-retraction component 12 on the first resonant pillar 11, while the connecting conductor 13 remains fixed inside the anti-retraction component 12 and does not easily detach outwards. Therefore, the connecting conductor 13 and the anti-retraction component 12 not only facilitate assembly but also provide high installation stability on the first resonant pillar 11, improving the port delay consistency of the filter and resulting in high product stability.

[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 element 41 whose position is adjustable vertically. The first resonant post 11 is provided with a first tuning hole 112, and the first tuning element 41 is positioned corresponding to the first tuning hole 112. Thus, when the vertical position of the first tuning element 41 of the first tuning component 40 is adjusted, the depth of the first tuning element 41 extending into the first tuning hole 112 is changed, thereby adjusting the resonant frequency of the filter.

[0070] The cover plate 30 is configured as a metal plate or a metallized dielectric plate. The first tuning element 41 includes, but is not limited to, a tuning screw or tuning rod, and is made of metal. The first tuning assembly 40 also includes a first adjusting nut 42 connected to the first tuning element 41. Rotating the first adjusting nut 42 can adjust the vertical position of the first tuning element 41 accordingly.

[0071] In one embodiment, there are two capacitively coupled port structures 10, which 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 resonant cavity 20 refers to the part on the inner wall of the resonant cavity 20 that is opposite to the position of 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 element 51 whose position is adjustable vertically. A second resonant post 60 is provided inside the resonant cavity 20, and the second resonant post 60 has a second tuning hole 61. The second tuning element 51 is positioned correspondingly to the second tuning hole 61. Thus, when the vertical position of the second tuning element 51 of the second tuning component 50 is adjusted, the depth of the second tuning element 51 extending into the second tuning hole 61 is changed, thereby enabling adjustment of the resonant frequency of the filter.

[0075] In some embodiments, the number of second resonant pillars 60 is set to multiple, and the number of second tuning components 50 is correspondingly set to multiple, with each second tuning component 50 corresponding to each second resonant pillar 60. In this way, the filter can have multiple resonators.

[0076] To further adjust the resonant frequency, a tuning component may optionally be provided between any two adjacent second resonant pillars 60.

[0077] In one embodiment, the filter further includes 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, bolts, pins, rivets, etc.

[0079] In the description of this application, it should be understood that if terms such as "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" appear, these terms indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application 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, and therefore should not be construed as a limitation of this application.

[0080] Furthermore, where the terms "first" and "second" appear, these terms are for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined with "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, where the term "multiple" appears, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0081] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise expressly limited. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0082] In this application, unless otherwise expressly specified and limited, the use of descriptions such as "above" or "below" the second feature indicates that the first and second features are in direct contact or indirect contact via an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. Similarly, "below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0083] It should be noted that if an element is referred to as being "fixed to" or "set on" another element, it can be directly on the other element or there may be an intervening element. If an element is considered to be "connected to" another element, it can be directly connected to the other element or there may be an intervening element. If so, 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 possible implementation.

[0084] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above 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 embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this patent application should be determined by the appended claims.

Claims

1. A capacitive coupling port structure for a filter, characterized in that, The capacitive coupling port structure includes: The first resonant post is used to be fixedly installed inside the resonant cavity, and the first resonant post is provided with a coupling hole; An anti-reverse component, one end of which is provided with an insertion portion, which is inserted into the coupling hole. The insertion portion and the first resonant post are in a maximum engagement along the retraction direction of the anti-reverse component. A connecting conductor is fixedly inserted inside the anti-reverse component, and the connecting conductor is coupled to the first resonant column; The coupling hole is configured as a through hole, and the coupling hole includes an assembly hole and an adjustment hole that are sequentially connected along the retraction direction. The insertion part is inserted into the assembly hole. The anti-retraction component also includes a main body segment connected to the insertion part. The main body segment is inserted into the adjustment hole, and the diameter of the adjustment hole is larger than the diameter of the assembly hole.

2. The capacitive coupling port structure according to claim 1, characterized in that, The insertion part includes at least two elastic retaining members, all of which are arranged sequentially around the circumference of the anti-backward member, and each elastic retaining member is engaged with the inner wall of the coupling hole.

3. The capacitive coupling port structure according to claim 2, characterized in that, The connecting conductor abuts tightly against the inner wall of the anti-reverse member, so that at least two of the elastic retaining members expand outward and cooperate 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 a through hole, and the end of the elastic retaining member is provided with an anti-retraction hook. The anti-retraction hook extends out of the coupling hole and engages with the first resonant post at the upper limit along the retraction direction.

5. The capacitive coupling port structure according to claim 1, characterized in that, The other end of the anti-reverse component is provided with a first positioning head, which is used to be inserted into the first mounting hole of the resonant cavity. The first positioning head is in a limiting fit with the resonant cavity along the insertion direction of the anti-reverse component.

6. The capacitive coupling port structure according to claim 5, characterized in that, The outer wall of the first positioning head is provided with a first boss, and the first boss and the second boss on the inner wall of the first mounting hole are engaged in a positioning fit along the insertion direction.

7. The capacitive coupling port structure according to claim 1, characterized in that, The outer wall of the connecting conductor is provided with anti-reverse barbs, and the anti-reverse barbs are engaged with the anti-reverse component in the retraction direction of the connecting conductor.

8. The capacitive coupling port structure according to claim 7, characterized in that, The anti-backlash barbs are configured in multiple ways, and the multiple anti-backlash barbs are arranged sequentially and at intervals around the outer periphery of the connecting conductor.

9. The capacitive coupling port structure according to claim 1, characterized in that, The connecting conductor is provided with a second positioning head at the end away from the first resonant post. The second positioning head is disposed inside the anti-backward component and is matched with the anti-backward component for limiting along the insertion direction of the connecting conductor.

10. The capacitive coupling port structure according to claim 9, characterized in that, The outer wall of the second positioning head is provided with a third protrusion, and the inner wall of the anti-backward component is provided with a fourth protrusion. The third protrusion and the fourth protrusion are engaged in a positioning fit along the insertion direction.

11. A filter, characterized in that, The filter includes a capacitive coupling port structure as described in any one of claims 1 to 10, and the filter further includes a resonant cavity and a cover plate, the cover plate being disposed at the opening of the resonant cavity, and the first resonant post being fixedly disposed inside the resonant cavity.

12. The filter according to claim 11, characterized in that, The filter further includes a first tuning component, which is disposed on the cover plate. The first tuning component includes a first tuning element whose position is adjustable up and down. The first resonant post is provided with a first tuning hole, and the first tuning element is positioned corresponding to the first tuning hole.

13. The filter according to claim 11, characterized in that, The capacitive coupling port structure consists of two parts, namely an input port structure and an output port structure.

14. The filter according to claim 11, characterized in that, The first resonant column is connected to the bottom wall of the resonant cavity and is designed as an integrated structure.

15. The filter according to claim 11, characterized in that, The filter further includes a second tuning component, which is disposed on the cover plate. The second tuning component includes a second tuning element whose position is adjustable up and down. A second resonant column is provided inside the resonant cavity. The second resonant column is provided with a second tuning hole. The second tuning element is positioned corresponding to the second tuning hole.

16. The filter according to claim 15, characterized in that, The filter also includes fasteners, and a protrusion is provided on the bottom wall of the resonant cavity. The second resonant column is fixedly mounted on the protrusion by the fasteners.

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