Cavity filter

Abstract

The embodiment of the present application discloses a cavity filter, which forms a sealed resonant cavity by adjusting an end cover and a body, and changes the positional relationship between the resonator and the adjusting end cover by the adjusting end cover with deformation capacity. Thus, when adjusting the performance parameters of the cavity filter, the resonant cavity can remain clean to avoid metal debris or external dust from entering the resonant cavity and affecting the filtering performance of the cavity filter. Meanwhile, the adjusting end cover is arranged to be driven by the driving body to generate a deformation amount relative to the resonator. The parameter adjustment range of the cavity filter is improved, so that the cavity filter can adapt to more frequency bands, and the communication quality of the communication equipment installed with the cavity filter is improved.

Description

Technical Field

[0001] This invention relates to the field of filters, and more particularly to a cavity filter. Background Technology

[0002] During the installation and debugging of cavity filters, the adjusting screw is inserted deep into the resonant cavity. By changing the insertion depth of the adjusting screw in the resonant cavity, the filtering performance parameters of the cavity filter are adjusted. However, this process can easily introduce metal debris and external foreign matter into the resonant cavity, thereby affecting the filtering performance of the cavity filter. Summary of the Invention

[0003] In view of this, embodiments of the present invention provide a cavity filter that uses a deformable adjustable end cap to change the volume of the resonant cavity, thereby adjusting the filtering performance of the cavity filter while ensuring the cleanliness of the resonant cavity during the process.

[0004] The cavity filter of this invention includes:

[0005] The housing includes a body and an adjustment end cap, the body and the adjustment end cap forming a resonant cavity, and the adjustment end cap having a deformation region;

[0006] A resonator is installed inside the resonant cavity, opposite to the deformed region and at a predetermined distance;

[0007] A driving assembly includes a driving body connected to the side of the deformed region away from the resonant cavity and operable to drive the deformed region toward and away from the resonator.

[0008] Furthermore, the adjusting end cap also includes a fixing region, which is arranged around the deformation region, and the body is fastened to the adjusting end cap through the fixing region;

[0009] The drive assembly also includes a support member, which is fixed to the adjustment end cover via the fixed area. The support member has a constraint portion that is adapted to the drive body and has at least one constraint position during the movement stroke of the drive body.

[0010] Furthermore, the support member also includes a first connecting plate, the outer edge of which is fixedly connected to the fixed area, and the constraint portion is disposed at the center of the first connecting plate and protrudes from the side of the first connecting plate away from the deformation area.

[0011] The driving body is connected to the center of the deformation region.

[0012] Furthermore, the constraint part has a threaded hole, and the driving body is an adjusting screw corresponding to the threaded hole;

[0013] The adjusting screw has a connecting end, which is connected to the adjusting end cover and also has a degree of rotational freedom.

[0014] Furthermore, the support member also includes a second connecting plate, which is a flat plate with threaded holes, and the outer edge of the second connecting plate is fixedly connected to the fixing area;

[0015] The constraint part includes an adjusting nut corresponding to the adjusting screw. The adjusting nut is placed on the side of the second connecting plate away from the adjusting end cover. The adjusting screw passes through the threaded hole and engages with the adjusting nut.

[0016] Furthermore, the connecting end has a positioning boss, which protrudes from the circumference of the connecting end;

[0017] The drive assembly also includes a limiting pressure ring, which has a positioning groove on the side facing the adjustment end cover. The limiting pressure ring is sleeved on the adjustment screw and connects the adjustment screw to the adjustment end cover through the positioning groove and the positioning boss.

[0018] Furthermore, the adjustment end cover also includes an annular flange, which protrudes from the side of the deformation region away from the resonant cavity;

[0019] The limiting pressure ring is engaged inside the annular flange, and the limiting pressure ring has an interference fit with the opposite side of the annular flange.

[0020] Furthermore, when the support member is fixed to the adjustment end cap, the annular flange is spaced apart from the support member.

[0021] Furthermore, the deformable region and the fixed region are integrally formed.

[0022] Furthermore, the resonator includes a connecting section and an extension section, the connecting section being connected to the body, and the extension section being circumferentially oriented towards the outer side of the resonator and corresponding to at least a portion of the deformed region.

[0023] The cavity filter of this invention utilizes an adjustable end cap and a main body to form a sealed resonant cavity, and employs a deformable adjustable end cap to alter the positional relationship between the resonator and the adjustable end cap. Therefore, when adjusting the performance parameters of the cavity filter, the resonant cavity can remain clean, preventing metal debris or external dust from entering and affecting the filter's performance. Simultaneously, the adjustable end cap is designed to deform relative to the resonator via a driving element. This improves the parameter adjustment range of the cavity filter, enabling it to adapt to more frequency bands. Attached Figure Description

[0024] The above and other objects, features and advantages of the present invention will become clearer from the following description of embodiments of the invention with reference to the accompanying drawings, in which:

[0025] Figure 1 This is a schematic diagram of the structure of a cavity filter in the prior art;

[0026] Figure 2 This is a schematic diagram of the cavity filter structure according to an embodiment of the present invention;

[0027] Figure 3 This is an exploded view of the cavity filter according to an embodiment of the present invention;

[0028] Figure 4 This is a cross-sectional schematic diagram of the cavity filter in some embodiments of the present invention;

[0029] Figure 5 This is a cross-sectional schematic diagram of the cavity filter in some other embodiments of the present invention;

[0030] Figure 6 This is a schematic diagram of the structure of the adjusting end cap according to an embodiment of the present invention;

[0031] Figure 7 This is a schematic diagram of the limiting pressure ring according to an embodiment of the present invention.

[0032] Explanation of reference numerals in the attached figures:

[0033] 1-Shell;

[0034] 11-Adjusting end cap;

[0035] 111 - Deformation region; 112 - Fixed region; 1121 - Annular groove; 113 - Annular flange; 114 - First surface; 115 - Second surface; 1151 - Center surface;

[0036] 12-Body; 13-Resonant cavity;

[0037] 2-Resonator; 21-Connecting section; 22-Extension section;

[0038] 3-Driver components;

[0039] 31-Driver; 311-Connecting end; 312-Positioning boss;

[0040] 32-Support member; 321-Constraint part; 322-First connecting plate; 323-Second connecting plate; 324-Adjusting nut;

[0041] 33-Limiting pressure ring; 331-Positioning groove; 332-First positioning edge; 333-Second positioning edge. Detailed Implementation

[0042] The present invention is described below based on embodiments, but the invention is not limited to these embodiments. In the detailed description of the invention below, certain specific details are described in detail. Those skilled in the art will fully understand the invention even without these details. To avoid obscuring the essence of the invention, well-known methods, processes, flows, elements, and circuits are not described in detail.

[0043] Furthermore, those skilled in the art should understand that the accompanying drawings provided herein are for illustrative purposes only and are not necessarily drawn to scale.

[0044] In the description of this invention, it should be understood that the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance. Furthermore, in the description of this invention, unless otherwise stated, "a plurality of" means two or more.

[0045] Unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," 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 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 invention according to the specific circumstances.

[0046] Figure 1 This is a schematic diagram of a cavity filter in the prior art. The cavity filter in the diagram adjusts its filtering performance by changing the length of the adjusting screw inserted into the resonant cavity 13. However, during this process, as the adjusting screw is screwed in and out, it brings dirt or dust located at the root of the thread into the resonant cavity 13. Furthermore, metal debris may also be generated during thread machining or during the meshing of internal and external threads. This metal debris may also be brought into the resonant cavity 13 as the adjusting screw is screwed in (as shown in region I).

[0047] Figure 2-3 These are structural schematics and exploded views of a cavity filter. Figure 4-5 These are schematic diagrams of different structural forms of cavity filters. The resonator 2 in the two diagrams has an extension 22 extending toward the sidewall of the resonant cavity 13, and the form of the middle section located at the center of the resonator 2 and connected to the extension 22 is different. Figure 4 The middle section is a solid structure. Figure 5 The middle section is a thin-walled structure. Figure 6 This is a schematic diagram of the structure of the adjusting end cap 11. (See diagram below.) Figure 2-6As shown, the adjusting end cap 11 and the body 12 form a sealed area, which can prevent dust from falling into it. The adjusting end cap 11 has a recessed area that is thinner than other areas, and it deforms when the adjusting end cap 11 is driven by the drive body 31.

[0048] In some implementations, such as Figure 1-6 As shown, the cavity filter includes a housing 1, a resonator 2, and a drive assembly 3. The housing 1 includes a body 12 and an adjustment end cap 11, which together form a resonant cavity 13. The adjustment end cap 11 has a deformation region 111. The resonator 2 is mounted within the resonant cavity 13 and positioned opposite the deformation region 111. The resonator 2 is at a predetermined distance from the adjustment end cap 11. The drive assembly 3 includes a drive body 31, which is connected to the side of the deformation region 111 facing away from the resonant cavity 13 and operably drives the deformation region 111 to move towards and away from the resonator 2.

[0049] In this embodiment, the adjustment end cap 11 is in a flat or nearly flat state when not pushed or pulled by the driving body 31. When the adjustment end cap 11 is pushed or pulled by the driving body 31, the deformation region 111 deforms, which changes the distance between the adjustment end cap 11 and the resonator 2, thus changing the volume of the resonant cavity 13. Simultaneously, the area of ​​the deformation region 111 can be selected according to the performance adjustment range required by the cavity filter. For example, when the cavity filter needs to filter in more frequency bands, the area of ​​the deformation region 111 can be configured to be larger to meet the adjustment requirements.

[0050] Optionally, the deformation type generated in the deformation region 111 includes elastic deformation or plastic deformation. In order to enable the adjustment end cap 11 to deform repeatedly to meet the performance parameter adjustment requirements of the cavity filter, the deformation type can be configured as elastic deformation, and the deformation amplitude can be controlled within a certain range, thereby avoiding cracks or even breakage in the deformation region 111 during the repeated deformation of the adjustment end cap 11.

[0051] The cavity filter and communication device of this invention utilize an adjusting end cap 11 and a body 12 to form a sealed resonant cavity 13, and uses the deformable adjusting end cap 11 to change the positional relationship between the resonator 2 and the adjusting end cap 11. Therefore, when adjusting the performance parameters of the cavity filter, the resonant cavity 13 can remain clean, preventing metal debris or external dust from entering the resonant cavity 13 and affecting the filtering performance of the cavity filter. Simultaneously, the adjusting end cap 11 is configured to deform relative to the resonator 2 through the action of the driving body 31. This improves the parameter adjustment range of the cavity filter, enabling it to adapt to more frequency bands and improving the communication quality of the communication device.

[0052] In some implementations, such as Figure 1-6 As shown, the adjusting end cap 11 also includes a fixing region 112, which surrounds the deformation region 111. The body 12 is fastened to the adjusting end cap 11 via the fixing region 112. The drive assembly 3 also includes a support member 32, which is fixed to the adjusting end cap 11 via the fixing region 112. The support member 32 has a constraint portion 321, which is adapted to the drive body 31 and has at least one constraint position during the movement stroke of the drive body 31.

[0053] In this embodiment, the fixing region 112 is used for connecting the adjusting end cap 11 and the body 12. Therefore, the fixing region 112 has a certain thickness on the adjusting end cap 11 to facilitate the connection between the adjusting end cap 11 and the body 12. This connection method can be screwed, welded, or anchored. However, the electrical performance of the housing 1 should be ensured after the adjusting end cap 11 and the body 12 are connected.

[0054] Specifically, Figure 2 The image shows a housing 1, in which the body 12 is a barrel-shaped component, the resonator 2 is mounted at the bottom of the barrel, and the opening of the barrel-shaped component is connected to the fixed area 112. After the adjusting end cap 11 is fastened together with the barrel-shaped component, the housing 1 has a roughly cylindrical shape.

[0055] In this embodiment, the constraint part 321 and the driving body 31 are arranged in pairs, meaning their forms can be matched. For example, the driving body 31 passes through the constraint part 321, and multiple retractable top balls or latches are provided laterally on the driving body 31. Conversely, multiple positioning holes are provided on the constraint part 321. When the driving body 31 moves to a designated position, the top balls are inserted into the positioning holes to complete the positioning of the driving body 31. Alternatively, multiple positioning holes can be provided simultaneously on both the constraint part 321 and the driving component, and the driving assembly 3 can be equipped with positioning clips corresponding to the positioning holes. When the driving body 31 moves to a designated position, the positioning clips are simultaneously inserted into the corresponding positioning holes on both the constraint part 321 and the driving component to complete the positioning of the driving body 31.

[0056] In some implementations, such as Figure 1-6 As shown, the support member 32 also includes a first connecting plate 322, the outer edge of which is fixedly connected to the fixed area 112. A constraint portion 321 is disposed at the center of the first connecting plate 322 and protrudes from the side of the first connecting plate 322 away from the deformation area 111. The drive body 31 is connected to the center of the deformation area 111. In this embodiment, the constraint portion 321 protrudes towards the outside of the cavity filter, so that the first connecting plate 322 can be closer to the adjustment end cap 11, thereby making the cavity filter smaller.

[0057] Optionally, the first connecting plate 322 can be processed by a flat plate, with holes punched in the middle area of ​​the flat plate, and then stamped or extruded at the position to form a flanged protrusion structure facing one side of the plane, and a mating structure corresponding to the driving body 31 is processed at the flanged protrusion position.

[0058] In some implementations, such as Figure 1-6 As shown, the constraint part 321 has a threaded hole, and the driving body 31 is an adjusting screw corresponding to the threaded hole. The adjusting screw has a connecting end 311, which is connected to the adjusting end cover 11 and has rotational freedom. In this embodiment, the deformation of the adjusting end cover 11 is controlled by screwing the adjusting screw in and out. When it is necessary to increase the volume of the resonant cavity 13, the adjusting screw is screwed out towards the outside of the cavity filter, and vice versa. During this process, the adjusting screw will rotate along the axis, and its bottom will also rotate relative to the adjusting end cover 11. In order to reduce the friction between the two, the surface roughness of the connection position between the adjusting screw and the adjusting end cover 11 can be reduced accordingly. This adjustment method has the following effects.

[0059] Firstly, those skilled in the art can change the deformation magnitude of the deformation region 111 by rotating the adjusting screw, thereby ensuring precise control of the deformation. For example, this can be achieved by observing and measuring the amount of the adjusting screw exposed on the top of the constraint portion 321. Figure 4 (As shown in region II), determine the current distance between the adjusting screw and resonator 2. Avoid screwing it in too much, which could cause contact with resonator 2 and short-circuit the cavity filter.

[0060] Secondly, to ensure the electrical performance of the housing 1, the thickness of the deformation region 111 should not be too small. Under this premise, in order to generate sufficient deformation in the deformation region 111, the drive assembly 3 needs to provide a large pushing and pulling force. At this time, sufficient pushing and pulling force can be ensured by using threaded engagement. When the thickness of the deformation region 111 is large, the operator can use tools such as wrenches with longer torque to rotate the adjusting screw.

[0061] In other implementations, such as Figure 1-6 As shown, the support member 32 also includes a second connecting plate 323, which is a flat plate with a threaded hole. The outer edge of the second connecting plate 323 is fixedly connected to the fixing area 112. The constraint part 321 includes an adjusting nut 324 corresponding to the adjusting screw. The adjusting nut 324 is located on the side of the second connecting plate 323 away from the adjusting end cover 11. The adjusting screw passes through the threaded hole and engages with the adjusting nut 324. In this embodiment, the adjusting nut 324 is used to achieve the engagement with the adjusting screw, simplifying the overall structure of the support member 32. At the same time, it can also ensure that there is a sufficient length of internal thread to engage with the external thread of the adjusting screw.

[0062] Specifically, in this embodiment, the pitch of the threaded hole is set to be the same as the pitch of the adjusting nut 324, so as to ensure that when the adjusting screw rotates by the same angle, it can move the same distance relative to the threaded hole and the adjusting nut.

[0063] It is easy to understand that in both of the above embodiments, the supporting force provided by the support member 32 is used to realize the up and down movement of the adjusting screw. Therefore, it is necessary to ensure that the first connecting plate 322 and the second connecting plate 323 have a certain rigidity to prevent the support member 32 from deforming before the adjusting end cover 11 during the screwing in and out process.

[0064] Figure 7 This is a schematic diagram of the limiting pressure ring 33. In some embodiments, such as... Figure 1-7 As shown, the connecting end 311 has a positioning boss 312, which protrudes circumferentially from the connecting end 311. The driving assembly 3 also includes a limiting pressure ring 33, which has a positioning groove 331 on the side facing the adjusting end cover 11. The limiting pressure ring 33 is sleeved on the adjusting screw and, through the cooperation of the positioning groove 331 and the positioning boss 312, connects the adjusting screw to the adjusting end cover 11. In this embodiment, the cooperation of the positioning boss 312 and the limiting pressure ring 33 enables the adjusting screw to pull the adjusting end cover 11. When the volume of the resonant cavity 13 is small, the adjusting screw can pull the deformation area 111 outward from the cavity filter.

[0065] Furthermore, the adjusting end cap 11 also includes an annular flange 113, which protrudes from the side of the deformation region 111 away from the resonant cavity 13. A limiting ring 33 is engaged inside the annular flange 113, and the limiting ring 33 and the opposite side of the annular flange 113 have an interference fit. In this embodiment, the limiting ring 33 can be pressed into the annular flange 113 using a crimping machine. This ensures that the limiting ring 33 can effectively limit the positioning boss 312, preventing loosening, by holding the limiting ring 33 tightly in the horizontal direction through the annular flange 113.

[0066] Specifically, such as Figure 7 As shown in the right figure, the limiting pressure ring 33 also has a first positioning edge 332 and a second positioning edge 333 on its side. The two positioning edges form an interference fit with the inner side of the annular flange 113. The outer diameter of the first positioning edge 332 is slightly smaller than the outer diameter of the second positioning edge 333, and the side of the first positioning edge 332 is a slope. Through this slope and the fit of the two positioning edges, the limiting pressure ring 33 can be easily pressed into the annular flange 113, so as to play a guiding role during the pressing process.

[0067] In some implementations, such as Figure 1-7As shown, when the support member 32 is fixed to the adjusting end cover 11, the annular flange 113 is spaced apart from the support member 32. Considering that when the volume of the resonant cavity 13 is increased, the adjusting screw will cause the adjusting end cover 11 to deform outward, a space is reserved between the annular flange 113 and the support member 32 in this embodiment. This space can ensure that the annular flange 113 will not easily collide with the support member 32 during the above process.

[0068] In some implementations, such as Figure 1-7 As shown, the adjustment end cap 11 includes a first surface 114 and a second surface 115 that are opposite to each other. The second surface 115 is located on the side facing the resonant cavity 13. The first surface 114 is recessed towards the second surface 115 to form a deformation region 111. In this embodiment, the deformation region 111 is configured to be thinner than other parts of the adjustment end cap 11, so that the deformation region 111 is more likely to deform when the adjustment end cap 11 is subjected to force.

[0069] Optionally, an annular groove 1121 is formed on the side of the fixed area 112 facing the support member 32, and this annular groove 1121 is adjacent to the first surface 114. The outer edges of the first connecting plate 322 and the second connecting plate 323 can be engaged in the annular groove 1121 to fix the support member 32 to the adjusting end cover 11. This further reduces the height of the cavity filter, making the internal space more compact.

[0070] In some implementations, such as Figure 1-7 As shown, the resonator 2 includes a connecting section 21 and an extension section 22. The connecting section 21 is connected to the body 12, and the extension section 22 is circumferentially oriented towards the outer side of the resonator 2 and corresponds to at least part of the deformation region 111.

[0071] It is easy to understand that the resonant cavity 13 of the cavity filter can be equivalent to a parallel circuit of an inductor and a capacitor, forming a resonant stage. When electromagnetic waves of different frequencies oscillate in the resonant cavity 13, electromagnetic waves reaching the filter's resonant frequency can be retained, while electromagnetic waves of other frequencies are dissipated, thereby achieving the filtering function. In the above embodiment, the extended section 22 and the second surface 115 form a capacitor region of the equivalent circuit.

[0072] Specifically, to ensure the electrical performance of the cavity filter capacitor region, in this embodiment, the second surface 115 is configured as a plane. This plane corresponds to the extension segment 22 to ensure the capacitor plate area. Optionally, the first surface 114 is also configured as a plane.

[0073] Furthermore, in this embodiment, the annular flange 113 is located in the middle of the deformation region 111. When the adjusting screw drives the adjusting end cover 11 to move, the deformation region 111 can generate the maximum deformation. At the same time, it can also ensure that the deformation in all directions is the same. Figure 5 Arrow A shown in the figure indicates the deformation direction of the adjusting end cap 11. As can be seen in the figure, the deformation region 111 is located between the fixed region 112 and the annular flange 113, with the deformation region 111 curving downwards near the annular flange 113. Conversely, the position of the annular flange 113 remains or approximately remains planar. This position is also the location on the inner wall of the resonant cavity 13 corresponding to the annular flange 113. The annular flange 113 provides better rigidity at this location, and the positioning boss 312 abuts against the inner side of the annular flange 113, also allowing this location to maintain a planar state. As can be seen in the figure, this position is also... Figure 5 The center surface 1151 is located in the middle region of the second surface 115. This center surface 1151 ensures that even if the adjusting end cap 11 deforms, a portion of its plane will still face the extension section 22, thus guaranteeing the electrical performance of the capacitor region. When the adjusting screw is rotated outward from the resonant cavity 13, the process is the reverse of the above process, and therefore will not be described again.

[0074] In some implementations, such as Figure 1-7 As shown, the deformable region 111 and the fixed region 112 are integrally formed. The adjusting end cap 11 can be manufactured by methods such as subtractive manufacturing, additive manufacturing, or stamping. Therefore, using the same material for the deformable region 111 and the fixed region 112 makes the transmission of electromagnetic waves between them smoother.

[0075] In an alternative implementation, the cavity filter in the above embodiments can be applied to a communication device. The communication device in this embodiment includes, but is not limited to, a duplexer, a combiner, or a tower amplifier (TA). The housing 1 can be fixed to the communication device.

[0076] The communication device of this invention utilizes the adjustment end cap 11 and the body 12 of a cavity filter to form a sealed resonant cavity 13, and uses the deformable adjustment end cap 11 to change the positional relationship between the resonator 2 and the adjustment end cap 11. Therefore, when adjusting the performance parameters of the cavity filter, the resonant cavity 13 can remain clean, preventing metal debris or external dust from entering the cavity 13 and affecting the filtering performance of the cavity filter. Simultaneously, the adjustment end cap 11 is configured to deform relative to the resonator 2 through the action of the drive body 31. This improves the parameter adjustment range of the cavity filter, enabling it to adapt to more frequency bands and improving the communication quality of the communication device.

[0077] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. For those skilled in the art, the present invention can be modified and varied in various ways. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principle of the present invention should be included within the scope of protection of the present invention.

Claims

1. A cavity filter, characterized in that, The cavity filter includes: The housing (1) includes a body (12) and an adjustment end cap (11), the body (12) and the adjustment end cap (11) forming a resonant cavity (13), and the adjustment end cap (11) having a deformation region (111); A resonator (2) is installed inside the resonant cavity (13), opposite to the deformed region and at a predetermined distance; The driving assembly (3) includes a driving body (31) connected to the side of the deformable region (111) away from the resonant cavity (13) and operable to drive the deformable region (111) to move toward and away from the resonator (2); The drive assembly (3) further includes a support member (32), which is fixed to the adjustment end cover (11). The support member (32) has a constraint part (321) with a threaded hole. The drive body (31) is an adjustment screw corresponding to the threaded hole. The adjustment screw has a connecting end (311) with a positioning boss (312) that protrudes from the circumference of the connecting end (311). The drive assembly (3) further includes a limiting pressure ring (33), which has a positioning groove (331) on the side facing the adjustment end cover (11); The adjustment end cap (11) also includes an annular flange (113), which protrudes from the side of the deformation region (111) away from the resonant cavity (13); The limiting pressure ring (33) is engaged inside the annular flange (113). The limiting pressure ring (33) and the opposite side of the annular flange (113) have an interference fit. The limiting pressure ring (33) is sleeved on the adjusting screw, and the positioning boss (312) is rotatably disposed in the positioning groove (331).

2. The cavity filter according to claim 1, characterized in that, The adjusting end cap (11) also includes a fixing area (112), which is arranged around the deformable area (111), and the body (12) is fastened to the adjusting end cap (11) through the fixing area (112); The support member (32) is fixed to the adjustment end cap (11) through the fixed area (112), and the constraint part (321) is adapted to the drive body (31) and has at least one constraint position in the movement stroke of the drive body (31).

3. The cavity filter according to claim 2, characterized in that, The support member (32) further includes a first connecting plate (322), the outer edge of the first connecting plate (322) is fixedly connected to the fixed area (112), and the constraint part (321) is disposed at the center of the first connecting plate (322) and protrudes from the side of the first connecting plate (322) away from the deformation area (111). The driving body (31) is connected to the center of the deformable region (111).

4. The cavity filter according to claim 2, characterized in that, The support member (32) further includes a second connecting plate (323), which is a flat plate with threaded holes, and the outer edge of the second connecting plate (323) is fixedly connected to the fixed area (112); The constraint part (321) includes an adjusting nut (324) corresponding to the adjusting screw. The adjusting nut (324) is placed on the side of the second connecting plate (323) away from the adjusting end cover (11). The adjusting screw passes through the threaded hole and engages with the adjusting nut (324).

5. The cavity filter according to claim 1, characterized in that, The limiting pressure ring (33) connects the adjusting screw to the adjusting end cover (11) through the cooperation of the positioning groove (331) and the positioning boss (312).

6. The cavity filter according to claim 1, characterized in that, When the support member (32) is fixed to the adjustment end cap (11), the annular flange (113) is spaced apart from the support member (32).

7. The cavity filter according to claim 2, characterized in that, The deformable region (111) and the fixed region (112) are integrally formed.

8. The cavity filter according to claim 1, characterized in that, The resonator includes a connecting section (21) and an extension section (22), the connecting section (21) being connected to the body (12), and the extension section (22) being circumferentially oriented toward the outer side of the resonator (2) and corresponding to at least a portion of the deformed region (111).

Images