Dielectric filter

Abstract

The utility model is suitable for the technical field of communication, and provides a dielectric filter, which comprises a cavity, a cover plate covers the cavity and is provided with a deformation part, and the deformation part is provided with a first mounting hole in a penetrating manner along the thickness direction of the cover plate; the first end of the dielectric resonator is contacted with the deformation part, and the second end is contacted with the inner bottom surface of the cavity; the locking piece is arranged in the first mounting hole in a penetrating mode, the first end of the locking piece is connected to the deformation part, the second end of the locking piece is connected with the inner bottom face of the cavity, the locking piece is made of insulating materials, the first end of the locking piece is provided with a second mounting hole, and the tuning piece is movably arranged in the second mounting hole and at least partially located in the resonant cavity. According to the dielectric filter, the acting force is applied to the deformation part through the locking piece, so that the dielectric resonance piece is stably fixed in the cavity; and the tuning piece can be tuned without electromagnetic interference of the locking piece, and can be compatible with the locking piece in occupied space, so that miniaturization of the dielectric filter is facilitated.

Description

Technical Field

[0001] The utility model belongs to the technical field of communication, and in particular relates to a dielectric filter. Background Art

[0002] At present, in the existing dielectric filters, in order to ensure that the dielectric resonator is firmly fixed, metal fasteners are usually used to ensure that the cover plate is pressed tightly against the dielectric resonator. In order to prevent the metal fasteners from affecting the operation of the tuning component, the tuning component is usually installed at a certain distance from the metal fasteners. At this time, the metal fasteners and the tuning component both occupy a part of the space in the resonant cavity, resulting in the problem that the metal fasteners and the tuning component occupy a large space in the filter, which is not conducive to the miniaturization of the filter. Utility Model Content

[0003] The utility model aims to provide a dielectric filter, aiming to solve the technical problem that metal fasteners and tuning parts of the dielectric filter in the prior art occupy a large space.

[0004] The utility model is implemented in this way: a dielectric filter comprises:

[0005] A cavity having a resonant cavity therein;

[0006] A cover plate, covering the cavity and having a deformation portion, wherein the deformation portion is provided with a first mounting hole through the cover plate along a thickness direction of the cover plate;

[0007] A dielectric resonator is installed in the resonant cavity, wherein a first end of the dielectric resonator contacts the deformable portion, and a second end of the dielectric resonator contacts the inner bottom surface of the cavity;

[0008] A locking member is inserted into the first mounting hole, a first end of the locking member is connected to the deformation portion, a second end of the locking member is connected to the inner bottom surface of the cavity, the locking member is made of insulating material, a second mounting hole is provided at the first end of the locking member, and the second mounting hole extends along the axial direction of the locking member;

[0009] A tuning member is movably disposed in the second mounting hole, and at least a portion of the tuning member is located inside the resonant cavity.

[0010] In some embodiments, the locking member includes a main body and a clamping portion radially protruding from one end of the main body, the clamping portion abuts against the side of the deformation portion away from the dielectric resonator, and one end of the main body away from the clamping portion is connected to the inner bottom surface of the cavity.

[0011] In some embodiments, the deformation portion includes a thinning groove disposed on a side of the cover plate facing away from the dielectric resonator, and the first mounting hole is opened at the bottom of the thinning groove.

[0012] In some embodiments, the axis of the thinning groove coincides with the axis of the dielectric resonator, and the bottom area of ​​the thinning groove is larger than the area of ​​the first end of the dielectric resonator.

[0013] In some embodiments, a reinforcing protrusion is provided at the bottom of the thinning groove, and the first mounting hole passes through the reinforcing protrusion; the first end of the locking member is connected to the reinforcing protrusion.

[0014] In some embodiments, the second mounting hole is arranged to penetrate the locking member along the axial direction.

[0015] In some embodiments, a connecting protrusion is provided on the inner bottom surface of the cavity, and the second end of the locking member is connected to the connecting protrusion.

[0016] In some embodiments, the connecting protrusion is provided with a third mounting hole, and the second end of the locking member is movably connected to the third mounting hole.

[0017] In some embodiments, the dielectric resonator has an avoidance through hole axially extending therethrough, and the locking member passes through the first mounting hole and the avoidance through hole in sequence and is connected to the inner bottom surface of the cavity.

[0018] In some embodiments, a connecting protrusion is provided on the inner bottom surface of the cavity, the second end of the locking member is connected to the connecting protrusion, and the connecting protrusion is inserted into the avoidance through hole.

[0019] The technical effect of the dielectric filter provided by the utility model is as follows: on the one hand, the first end and the second end of the dielectric resonator contact the inner bottom surface of the cover plate and the cavity respectively, and at the same time, a first mounting hole is provided through the deformation part of the cover plate, and the locking member is provided in the first mounting hole and its first end is connected to the deformation part and the second end is connected to the inner bottom surface of the cavity, so that the deformation part can apply a force toward the dielectric resonator through the locking member, so that the deformation part presses and fixes the dielectric resonator, so that the first end and the second end of the dielectric resonator can be closely contacted with the inner surface of the cover plate and the inner surface of the cavity respectively, reducing the nonlinear contact between the opposite ends of the dielectric resonator and the cover plate and the cavity, and improving the performance index of the filter. On the other hand, the locking member is made of insulating material and is provided with a second mounting hole, and the tuning member is movably provided in the second mounting hole to exert its tuning function, so that the tuning member can be tuned without being electromagnetically interfered by the locking member, and can be compatible with the locking member in terms of occupied space, which is conducive to the miniaturization of the dielectric filter. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the technical solutions of the embodiments of the utility model, the drawings required for use in the embodiments of the utility model or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0021] Figure 1 It is a structural schematic diagram of a dielectric filter provided by an embodiment of the utility model;

[0022] Figure 2 It is a schematic diagram of the exploded structure of the dielectric filter provided by the embodiment of the utility model;

[0023] Figure 3 It is a schematic cross-sectional structural diagram of a dielectric filter provided by an embodiment of the utility model.

[0024] Description of reference numerals:

[0025] 1. Cavity; 101. Resonant cavity; 102. Connecting protrusion; 103. Third mounting hole; 2. Cover plate; 201. First mounting hole; 202. Deformation portion; 202a. Thinning groove; 203. Strengthening protrusion; 3. Dielectric resonator; 301. Avoidance through hole; 4. Locking member; 401. Second mounting hole; 402. Pressing portion; 403. Main body; 5. Tuning member. DETAILED DESCRIPTION

[0026] The embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present invention, and should not be construed as limiting the present invention.

[0027] In the description of the present invention, it should be understood that the terms "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do 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 invention.

[0028] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present utility model, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0029] In the present invention, unless otherwise clearly specified and limited, the terms "install", "connect", "connect", "fix" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral 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. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0030] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments.

[0031] At present, dielectric resonators are usually fixed by cover plates. In order to ensure the fixation of dielectric resonators, metal fasteners are usually provided between the cover plate and the inner bottom surface of the cavity. The cover plate is pushed or pulled toward the inner bottom surface of the cavity by the metal fasteners, so as to achieve the purpose of the cover plate pressing the dielectric resonator. At the same time, a tuning part is also provided on the dielectric filter to adjust the frequency of the dielectric filter. Since the metal fasteners will affect the operation of the tuning part, the tuning part needs to be spaced apart from the metal fasteners. At this time, both the metal fasteners and the tuning part need to occupy a part of the space in the resonant cavity, which is not conducive to the miniaturization of the dielectric filter.

[0032] To solve the above technical problems, please refer to Figures 1 to 3As shown, a dielectric filter is provided, comprising a cavity 1, a cover plate 2, a dielectric resonator 3, a locking member 4 and a tuning member 5; the cavity 1 has a resonant cavity 101 inside, the cover plate 2 covers the cavity 1, the cover plate 2 comprises a cover plate body and a deformable portion 202, the deformable portion 202 is provided with a first mounting hole 201 through it along the thickness direction of the cover plate 2; the dielectric resonator 3 is installed in the resonant cavity 101, the first end of the dielectric resonator 3 contacts the deformable portion 202 of the cover plate 2, and the second end of the dielectric resonator 3 contacts the inner bottom surface of the cavity 1. The locking member 4 is provided in the first mounting hole 201, the first end of the locking member 4 is connected to the deformable portion 202 of the cover plate 2, the second end of the locking member 4 is connected to the inner bottom surface of the cavity 1, the locking member 4 is made of insulating material, the first end of the locking member 4 is provided with a second mounting hole 401 extending along the axial direction of the locking member 4, the tuning member 5 is movably provided in the second mounting hole 401, and at least part of the tuning member 5 is located inside the resonant cavity 101.

[0033] Among them, the first end and the second end of the dielectric resonator 3 refer to the opposite ends of the dielectric resonator 3 in the spacing direction between the cover plate 2 and the inner bottom surface of the cavity 1; the first end and the second end of the locking member 4 refer to the opposite ends of the locking member 4 along its length direction.

[0034] The first mounting hole 201 refers to a through hole provided through the deformation portion 202 of the cover plate 2, and the axial direction of the through hole is parallel to the thickness direction of the cover plate 2. The locking member 4 refers to a member having a certain length, and the locking member 4 is inserted into the first mounting hole 201, which means that the locking member 4 passes through the first mounting hole 201 and extends into the interior of the resonant cavity 101.

[0035] The second mounting hole 401 is a hole structure arranged along the length direction of the locking member 4. The second mounting hole 401 can be a through hole structure arranged along the length direction of the locking member 4 and passing through the entire locking member 4; or it can be a blind hole structure extending along the length direction of the locking member 4 with only its first end open.

[0036] The tuning member 5 is a member with a certain length, and a portion of the tuning member 5 extends into the second mounting hole 401 on the locking member 4, and further extends into the interior of the resonant cavity 101. The tuning member 5 is movably arranged in the second mounting hole 401, which means that the tuning member 5 is installed in the second mounting hole 401 and has the freedom to move along the depth direction of the second mounting hole 401. The length of the tuning member 5 entering the resonant cavity 101 is changed by the movement of the tuning member 5, so as to adjust the frequency of the filter.

[0037] In the dielectric filter provided by the embodiment of the utility model, on the one hand, the first end and the second end of the dielectric resonator 3 contact the inner surface of the cover plate 2 and the cavity 1 respectively, and at the same time, a first mounting hole 201 is provided through the deformation portion 202 of the cover plate 2, and the locking member 4 is passed through the first mounting hole 201 and its first end is connected to the deformation portion 202, and the second end is connected to the inner bottom surface of the cavity 1. In this way, the locking member 4 can apply a force toward the dielectric resonator 3 to the deformation portion 202, so that the deformation portion 202 presses and fixes the dielectric resonator 3, so that the first end and the second end of the dielectric resonator 3 can be closely contacted with the inner surface of the cover plate 2 and the inner surface of the cavity 1 respectively, that is, the nonlinear contact between the opposite ends of the dielectric resonator 3 and the cover plate 2 and the cavity 1 is reduced, and the filter performance index is improved. On the other hand, the locking member 4 is made of insulating material and is provided with a second mounting hole 401. The tuning member 5 is movably arranged in the second mounting hole 401 to exert its tuning function, so that the tuning member 5 can be tuned without being subject to electromagnetic interference from the locking member 4, and can also be compatible with the locking member 4 in terms of occupied space, which is beneficial to the miniaturization of the dielectric filter.

[0038] In some embodiments, the first end of the locking member 4 can be connected to the inner wall of the first mounting hole 201, thereby achieving connection with the deformation part 202. For example, the first end of the locking member 4 is connected to the inner wall of the first mounting hole 201 by threaded connection, or is connected to the inner wall of the first mounting hole 201 by interference fit, and the locking member 4 applies a force to the deformation part 202 in the direction of the dielectric resonator 3 based on the above connection structure. The second end of the locking member 4 can be connected to the inner bottom surface of the cavity 1 by threaded connection, or can be connected to the inner bottom surface of the cavity 1 by plugging, crimping or clamping, so that the second end of the locking member 4 has a certain degree of mobility on the basis of ensuring a stable connection to the cavity 1.

[0039] In other embodiments, Figure 2 and Figure 3 As shown, the first end of the locking member 4 is connected to the deformation part 202 by abutting. The locking member 4 includes a main body 403 extending into the first mounting hole 201 and connected to the inner bottom surface of the cavity 1, and a pressing portion 402 radially protruding from one end of the main body 403. It can be understood that the pressing portion 402 is the first end of the locking member 4, and the end of the main body 403 close to the inner bottom surface of the cavity 1 is the second end of the locking member 4. The pressing portion 402 abuts against the side of the deformation part 202 away from the dielectric resonator 3.

[0040] Specifically, the radial dimension of the main body 403 may be smaller than the radial dimension of the first mounting hole 201, but the radial dimension of the pressing portion 402 is larger than the radial dimension of the first mounting hole 201, so that after the main body 403 is inserted into the first mounting hole 201, the pressing portion 402 can be pressed against the side of the deformation portion 202 away from the dielectric resonator 3. In this embodiment, while the main body 403 is fixed to the inner bottom surface of the cavity 1, the pressing portion 402 can press the deformation portion 202, thereby forcing the deformation portion 202 to apply pressure to the dielectric resonator 3, and the dielectric resonator 3 is pressed and fixed.

[0041] In one embodiment, the main body 403 may be a columnar structure, and the clamping portion 402 may be a flat columnar, prism-shaped, or plate-shaped. The clamping portion 402 may be an integral structure with the main body 403; the clamping portion 402 may also be a separate structure from the main body 403, for example, the clamping portion 402 is installed to the first end of the main body 403 by threaded connection, and the length of the locking member 4 may also be adjusted by the thread.

[0042] In one embodiment, Figure 2 As shown, the clamping portion 402 can be a prismatic structure, that is, the cross-section of the clamping portion 402 is a polygon, and the circumference of the clamping portion 402 has multiple small planes. When the entire locking piece 4 needs to be rotated, a tool is used to conveniently clamp the clamping portion 402 to prevent relative sliding between the clamping portion 402 and the tool, thereby making the rotation of the entire locking piece 4 more convenient.

[0043] In the embodiment of the present application, the deformation portion 202 refers to a portion that can be deformed. The deformation portion 202 can be formed by setting a structure with lower rigidity between two structures with higher rigidity of the cover plate 2; the deformation portion can also be formed by thinning the thickness of a local area of ​​the cover plate 2, so that the rigidity of the object in the thinned area is reduced so that deformation can occur in the thinned area; of course, the deformation portion 202 can also be formed on the cover plate 2 in many other ways, which are not listed here one by one.

[0044] In one embodiment, Figure 2 and Figure 3 As shown, the side of the cover plate 2 away from the dielectric resonator 3 is partially thinned to form a thinning groove 202a, and the deformation portion 202 is the groove bottom of the thinning groove 202a. The first mounting hole 201 passes through the groove bottom of the thinning groove 202a, and the locking member 4 drives the groove bottom of the thinning groove 202a to move along the axial direction of the dielectric resonator 3, thereby applying axial pressure to the first end of the dielectric resonator 3. The thinning groove 202a can be made by lathe processing, or by casting or stamping. The setting of the thinning groove 202a can reduce the manufacturing difficulty of the deformation portion 202, and reduce the overall processing difficulty and processing cost of the cover plate 2.

[0045] Furthermore, the axis of the thinning groove 202a coincides with the axis of the dielectric resonator 3, and the bottom area of ​​the thinning groove 202a is larger than the area of ​​the first end of the dielectric resonator 3. This facilitates the bottom of the thinning groove 202a to fully cover and evenly pressurize the first end of the dielectric resonator 3.

[0046] Optionally, when the locking member 4 includes the pressing portion 402 , the pressing portion 402 is located in the thinning groove 202 a to avoid protruding from the cover plate 2 , so that the pressing portion 402 can share the space of the deformation portion 202 .

[0047] In some embodiments, a reinforcing protrusion 203 is provided at the bottom of the thinning groove 202a, the first mounting hole 201 passes through the reinforcing protrusion 203, and the first end of the locking member 4 is connected to the reinforcing protrusion 203. The reinforcing protrusion 203 provides a larger connection space and contact area for the first end of the locking member 4, so that the locking member 4 and the deformed portion 202 can be connected more stably, avoiding the problem of failure due to the thin bottom wall of the thinning groove 202a being easily subjected to force for a long time.

[0048] Furthermore, when the locking member 4 includes a pressing portion 402, the pressing portion 402 abuts against the end surface of the reinforcing protrusion 203 away from the dielectric resonator 3. Of course, the pressing portion 402 is also hidden in the thinning groove 202a to minimize the occupied space. When the first end of the locking member 4 is not provided with the pressing portion 402, the locking member 4 can also be connected to the inner wall of the first mounting hole 201 on the reinforcing protrusion 203 by means of threaded connection, interference fit, etc.

[0049] As a connection method between the second end of the locking member 4 and the inner bottom surface of the cavity 1, such as Figure 2 and Figure 3 As shown, the inner bottom surface of the cavity 1 is provided with a third mounting hole 103, and the second end of the locking member 4 is connected to the third mounting hole 103. Specifically, the second end of the locking member 4 and the third mounting hole 103 can be movably connected by plugging, threading, etc. It can be understood that when the locking member 4 includes a main body 403 and a pressing part 402, the end of the main body 403 is connected to the third mounting hole 103. Among them, the third mounting hole 103 refers to a hole structure with a certain depth provided on the inner bottom surface of the cavity 1.

[0050] In the above embodiment, by setting the second end of the locking member 4 in the third mounting hole 103, the contact area between the second end of the locking member 4 and the inner bottom surface of the cavity 1 is larger, so that the locking member 4 can be installed more firmly. In addition, the second end of the locking member 4 is movably connected to the third mounting hole 103, and the distance between the first end of the locking member 4 and the inner bottom surface of the cavity 1 can be adjusted, thereby adapting to the dielectric resonator 3 of different lengths, ensuring that the deformation portion 202 of the cover plate 2 always presses and fixes the dielectric resonator 3.

[0051] For example, the second end of the locking member 4 is threadedly connected to the third mounting hole 103. At this time, the locking member 4 can be moved along the axial direction of the dielectric resonator 3 by screwing the first end of the locking member 4, thereby driving the deformation portion 202 of the cover plate 2 to deform toward the dielectric resonator 3, and after being pressed into place, the second end of the locking member 4 is naturally threadedly locked and fixed to the third mounting hole 103, so that the pressing operation of the dielectric resonator 3 can be conveniently and quickly realized, and the stability of the dielectric resonator 3 after pressing can be ensured.

[0052] In some other embodiments, the inner bottom surface of the cavity 1 is not provided with the third mounting hole 103, and a mounting hole may be provided at the second end of the locking member 4, and a mounting column may be provided on the inner bottom surface of the cavity 1, and the two may be movably connected.

[0053] In one embodiment, Figure 2 and Figure 3 As shown, a connecting protrusion 102 is provided on the inner bottom surface of the cavity 1, and the second end of the locking member 4 is connected to the connecting protrusion 102. The provision of the connecting protrusion 102 can increase the local wall thickness of the bottom wall of the cavity 1, which can further enhance the connection strength between the second end of the locking member 4 and the inner bottom surface of the cavity 1. At the same time, the part of the bottom wall of the cavity 1 where the connecting protrusion 102 is not provided can be designed to be thinner, which is conducive to reducing the weight of the filter.

[0054] In one embodiment, Figure 2 and Figure 3 As shown, the third mounting hole 103 is provided on the connecting protrusion 102, and the second end of the locking member 4 is movably connected to the third mounting hole 103. Optionally, the second end of the locking member 4 is provided with an external thread, and the inner wall of the third mounting hole 103 is provided with an internal thread, and the two are threadedly connected. By providing the connecting protrusion 102 on the inner bottom surface of the cavity 1 and providing the third mounting hole 103 on the connecting protrusion 102, on the one hand, the contact area between the second end of the locking member 4 and the inner bottom surface of the cavity 1 can be further increased, so that the locking member 4 can be installed more firmly; on the other hand, the third mounting hole 103 is recessed inwardly relative to the end surface of the connecting protrusion 102, that is, the distance between the first mounting hole 201 and the bottom of the third mounting hole 103 is greater than the distance between the first mounting hole 201 and the end surface of the connecting protrusion 102, so the length of the locking member 4 It can be designed to be longer, and the hole depth of the second mounting hole 401 on the locking member 4 can be designed to be deeper, so that the movable stroke of the tuning member 5 can be increased, and the tuning range of the dielectric filter is increased. At the same time, the tuning member 5 cannot contact the inner bottom surface of the cavity 1 to avoid a short circuit. Compared with the contact between the tuning member 5 and the end surface of the connecting protrusion 102, the bottom of the third mounting hole 103 is farther from the end of the tuning member 5, and the tuning member 5 is less likely to contact the bottom of the third mounting hole 103, thereby avoiding the occurrence of a short circuit and improving the stability of the dielectric filter.

[0055] In some other embodiments, the third mounting hole 103 is not provided on the connecting protrusion 102, and the second end of the locking member 4 is sleeved on the outer wall of the connecting protrusion 102. Alternatively, a mounting hole can be provided at the second end of the locking member 4, and a mounting column can be provided on the connecting protrusion 102, and the two are movably connected.

[0056] In some embodiments, please refer to Figure 3 The dielectric resonator 3 has an axially penetrating avoidance through hole 301, that is, the avoidance through hole 301 is opened inside the dielectric resonator 3 and penetrates the first end and the second end of the dielectric resonator 3. During installation, the locking member 4 is sequentially penetrated through the first installation hole 201 and the avoidance through hole 301 and connected to the inner bottom surface of the cavity 1 to fix the dielectric resonator 3.

[0057] By arranging the avoidance through hole 301 axially through the inside of the dielectric resonator 3, on the one hand, the locking member 4 and the tuning member 5 can be extended into the inside of the dielectric resonator 3, and the internal space of the dielectric resonator 3 can be fully utilized. The locking member 4 and the tuning member 5 do not need to occupy the external space of the dielectric resonator 3, thereby reducing the volume of the dielectric filter, which is conducive to the miniaturization of the dielectric filter. On the other hand, the axis of the dielectric resonator 3, the axis of the locking member 4 and the axis of the tuning member 5 can be overlapped or roughly overlapped; the axis of the locking member 4 overlaps with the axis of the dielectric resonator 3, so that the first end of the dielectric resonator 3 is subjected to radially uniform pressure. At the same time, the locking member 4 can be connected to the middle position of the deformation part 202, and the deformation part 202 is easier to deform and the deformation amount is larger, and the compression and fixing effect of the dielectric resonator 3 is better; the axis of the tuning member 5 overlaps with the axis of the dielectric resonator 3, so that the tuning member 5 is located at a position with a strong electric field in the resonant cavity 101, thereby improving the sensitivity and tuning range of tuning.

[0058] It can be understood that in this embodiment, the number of locking members 4 can be set to only one, that is, only one locking member 4 is required to meet the uniformity of the force on the first end of the dielectric resonator 3 and the force compression strength, which can reduce the number of parts, simplify the structure of the dielectric filter, and reduce the volume of the dielectric filter. Of course, in other embodiments, the number of locking members 4 can also be greater than one, one of the locking members 4 is inserted into the avoidance through hole 301, and the remaining locking members 4 are located on the outside of the dielectric resonator 3.

[0059] Further, in some embodiments, please refer to Figure 3When the above-mentioned connecting protrusion 102 is provided on the inner bottom surface of the cavity 1, the connecting protrusion 102 is plugged into and matched with the avoidance through hole 301 to assist in fixing the dielectric resonator 3. The plugging and matching of the connecting protrusion 102 and the avoidance through hole 301 means that the connecting protrusion 102 is inserted into the avoidance through hole 301, and a part of the outer wall or the entire outer wall of the connecting protrusion 102 can fit with the inner wall of the avoidance through hole 301, so as to avoid a gap between the outer periphery of the connecting protrusion 102 and the inner wall of the avoidance through hole 301, thereby radially limiting the second end of the dielectric resonator 3, preventing the second end of the dielectric resonator 3 from moving in the radial direction, and making the installation of the dielectric resonator 3 more stable.

[0060] Preferably, the shape of the connecting protrusion 102 is adapted to the shape of the avoiding through hole 301, and the outer wall of the connecting protrusion 102 and the inner wall of the avoiding through hole 301 are completely fitted to prevent the second end of the dielectric resonator 3 from shaking. In addition, it is also helpful to ensure that the axis of the connecting protrusion 102 coincides with the axis of the dielectric resonator 3, and then ensure that the axis of the locking member 4 coincides with the axis of the dielectric resonator 3, so that the force on the first end of the dielectric resonator 3 in the radial direction is more uniform.

[0061] Since the second end of the locking member 4 is connected to the connecting protrusion 102, by plugging the connecting protrusion 102 with the avoidance through hole 301, the connecting protrusion 102 can not only be used for connecting the second end of the locking member 4, but also can be used for limiting the installation of the dielectric resonator 3. There is no need to additionally set a limiting groove, limiting protrusion, limiting convex ring and other structures for limiting the installation of the dielectric resonator 3 on the inner bottom surface of the cavity 1. The connecting protrusion 102 can realize two functions at the same time with only one structure, which greatly simplifies the structural design of the dielectric filter and is conducive to the miniaturization and simplification of the dielectric filter.

[0062] In some other embodiments, the dielectric resonator 3 does not have the avoidance through hole 301. In this case, the dielectric resonator 3 may be a solid columnar structure or a block structure. The locking member 4 may be arranged on the circumferential side of the dielectric resonator 3. In this case, at least two locking members 4 may be provided, and at least two locking members 4 are spaced apart along the circumference of the dielectric resonator 3, so that the first end of the dielectric resonator 3 is subjected to uniform force. When there are multiple locking members 4, the tuning member 5 may be installed on each locking member 4, or only on some of the locking members 4.

[0063] As a connection method between the tuning element 5 and the second mounting hole 401, Figure 3 As shown, the tuning member 5 is threadedly connected to the second mounting hole 401. When the position of the tuning member 5 needs to be adjusted, the tuning member 5 can be moved along the axis of the second mounting hole 401 by simply rotating the tuning member 5, thereby ensuring that the tuning member 5 is stably installed and making the position adjustment of the tuning member 5 more convenient.

[0064] In other embodiments, the tuning component 5 is interference fit with the second mounting hole 401, and relative sliding of the tuning component 5 and the second mounting hole 401 is achieved by overcoming friction. When the tuning component 5 is not subjected to external force, it can be kept fixed by the friction between the tuning component 5 and the inner wall of the second mounting hole 401. When the tuning component 5 needs to move, it only needs to apply a force greater than the friction force to the tuning component 5 to achieve movement of the tuning component 5.

[0065] In some embodiments, the second mounting hole 401 is arranged to penetrate along the axial direction of the locking member 4, so that the tuning member 5 has a larger moving stroke, thereby generating a wider tuning range.

[0066] The above description is only a preferred embodiment of the utility model, and only specifically describes the technical principle of the utility model. These descriptions are only for explaining the principle of the utility model and cannot be interpreted as limiting the protection scope of the utility model in any way. Based on the explanation here, any modification, equivalent replacement and improvement made within the spirit and principle of the utility model, and other specific implementation methods of the utility model that can be associated with the technicians in this field without creative labor, should be included in the protection scope of the utility model.

Claims

1. A dielectric filter, characterized in that: include: A cavity having a resonant cavity therein; A cover plate, covering the cavity and having a deformation portion, wherein the deformation portion is provided with a first mounting hole through the cover plate along a thickness direction of the cover plate; A dielectric resonator is installed in the resonant cavity, wherein a first end of the dielectric resonator contacts the deformable portion, and a second end of the dielectric resonator contacts the inner bottom surface of the cavity; A locking member is inserted into the first mounting hole, a first end of the locking member is connected to the deformation portion, a second end of the locking member is connected to the inner bottom surface of the cavity, the locking member is made of insulating material, a second mounting hole is provided at the first end of the locking member, and the second mounting hole extends along the axial direction of the locking member; A tuning member is movably disposed in the second mounting hole, and at least a portion of the tuning member is located inside the resonant cavity.

2. The dielectric filter according to claim 1, characterized in that The locking member includes a main body and a clamping portion radially protruding from one end of the main body, the clamping portion abuts against the side of the deformation portion away from the dielectric resonator, and one end of the main body away from the clamping portion is connected to the inner bottom surface of the cavity.

3. The dielectric filter according to claim 1, wherein The deformation portion includes a thinning groove arranged on the side of the cover plate away from the dielectric resonator, and the first mounting hole is opened at the bottom of the thinning groove.

4. The dielectric filter according to claim 3, characterized in that The axis of the thinning groove coincides with the axis of the dielectric resonator, and the bottom area of ​​the thinning groove is larger than the area of ​​the first end of the dielectric resonator.

5. The dielectric filter according to claim 3, characterized in that A reinforcing protrusion is provided at the bottom of the thinning groove, and the first mounting hole passes through the reinforcing protrusion; the first end of the locking member is connected to the reinforcing protrusion.

6. The dielectric filter according to claim 1, wherein: The second mounting hole is arranged to penetrate the locking member along the axial direction.

7. The dielectric filter according to any one of claims 1 to 6, characterized in that: A connecting protrusion is provided on the inner bottom surface of the cavity, and the second end of the locking member is connected to the connecting protrusion.

8. The dielectric filter according to claim 7, characterized in that The connecting protrusion is provided with a third mounting hole, and the second end of the locking member is movably connected to the third mounting hole.

9. The dielectric filter according to any one of claims 1 to 6, characterized in that: The dielectric resonator has an escape through hole axially extending therethrough, and the locking member passes through the first mounting hole and the escape through hole in sequence and is connected to the inner bottom surface of the cavity.

10. The dielectric filter according to claim 9, characterized in that A connecting protrusion is provided on the inner bottom surface of the cavity, the second end of the locking member is connected to the connecting protrusion, and the connecting protrusion is inserted into the avoidance through hole.

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