TM mode dielectric filter

Abstract

The utility model relates to the technical field of communication, and provides a TM mode dielectric filter which comprises a cavity, a dielectric resonator and a cover plate assembly, the dielectric resonator is located in the cavity, the cover plate assembly comprises a cover plate, a rotating part and an adjusting part, the cover plate covers an opening of the cavity in a sealing mode, the cover plate comprises a fixed part and a deformation part, and the fixed part and the deformation part define a containing groove; the rotating part is rotationally installed on the fixing part and provided with a first threaded hole, the adjusting part is located in the containing groove and is in threaded connection with the first threaded hole, and the end, close to the deformation part, of the adjusting part is fixedly connected with the deformation part. According to the TM mode dielectric filter, the adjusting piece can be driven to move along the depth direction of the cavity by rotating the rotating piece, so that the dielectric resonator is pressed by the deformation part, the problem that the two end faces of the dielectric resonator cannot be in good contact with the cover plate and the bottom of the cavity is solved, and the high Q value of the TM mode dielectric filter is ensured.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of communication, in particular to a TM mode dielectric filter. BACKGROUND

[0002] Dielectric filters are widely used in the field of communication due to their small size and high Q value (also known as quality factor; the higher the Q value, the better the filtering characteristics). Dielectric filters are generally divided into TM mode dielectric filters and TE mode dielectric filters; among them, a TM mode dielectric filter includes a cavity, a dielectric resonator, and a cover plate, the dielectric resonator is in the cavity, and the cover plate covers the opening of the cavity.

[0003] However, after the cover plate covers the opening of the cavity, due to the existence of processing errors, the two ends of the dielectric resonator and the cover plate and the bottom of the cavity may not achieve good contact, thereby affecting the Q value of the TM mode dielectric filter. CONTENT OF THE INVENTION

[0004] Therefore, the embodiments of the present application provide a TM mode dielectric filter to solve the problem that the two ends of the dielectric resonator and the cover plate and the bottom of the cavity cannot achieve good contact.

[0005] The first aspect of the present application provides a TM mode dielectric filter, including a cavity, a dielectric resonator, and a cover plate assembly, the dielectric resonator is in the cavity, the cover plate assembly includes a cover plate, a rotating piece, and an adjusting piece, the cover plate covers the opening of the cavity, the cover plate includes a fixed part and a deformed part, the fixed part and the deformed part enclose an accommodating groove; the rotating piece is rotatably installed on the fixed part, the rotating piece has a first threaded hole, the adjusting piece is in the accommodating groove and is threadedly connected with the first threaded hole, and an end of the adjusting piece close to the deformed part is fixedly connected with the deformed part.

[0006] The TM mode dielectric filter provided by the embodiments of the present application has the beneficial effects that: since the rotating piece is rotatably installed on the fixed part, the end of the adjusting piece close to the deformed part is fixedly connected with the deformed part and the adjusting piece is threadedly connected with the first threaded hole on the rotating piece, therefore, by rotating the rotating piece, the rotating piece can drive the adjusting piece to move along the depth direction of the cavity, so that the deformed part presses the dielectric resonator, solving the problem that the two end faces of the dielectric resonator and the cover plate and the bottom of the cavity cannot achieve good contact, and ensuring the high Q value of the TM mode dielectric filter.

[0007] In some embodiments, the fixed part includes a fixed body and a limiting body integrally formed with the fixed body, and the rotating piece is rotatably installed between the fixed body and the limiting body.

[0008] In some embodiments, the limiting body is a limiting flange bent on the fixing body; or the limiting body comprises a plurality of convex portions arranged along the circumference of the fixing body.

[0009] In some embodiments, the rotating member is a sheet structure or a plate structure.

[0010] In some embodiments, the rotating member is provided with an operation hole.

[0011] In some embodiments, the adjusting member is integrally connected with the deformed portion; or the adjusting member is welded on the deformed portion.

[0012] In some embodiments, the dielectric resonator has a through hole, the adjusting member has a second threaded hole, the TM mode dielectric filter further comprises a tuning member threadedly connected in the second threaded hole, and a locking nut threadedly connected on the tuning member, the tuning member extending into the through hole.

[0013] In some embodiments, an end of the tuning member away from the dielectric resonator is provided with a limiting portion for limiting the depth of the tuning member extending into the through hole.

[0014] In some embodiments, the dielectric resonator has a through hole, and the bottom of the cavity is provided with a positioning boss extending into the through hole.

[0015] In some embodiments, the bottom of the cavity is further provided with a support platform, and the positioning boss is on the support platform.

[0016] The above description is only a summary of the technical solutions of the present application. In order to more clearly understand the technical means of the present application, the following specific embodiments of the present application can be implemented according to the content of the description, and in order to make the above and other purposes, features and advantages of the present application more obvious and easy to understand, the following specific embodiments of the present application are described. BRIEF DESCRIPTION OF DRAWINGS

[0017] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following will briefly introduce the drawings needed to be used in the embodiments or conventional technology description. Obviously, the drawings in the following description are only some embodiments of the present application, and those skilled in the art can obtain other drawings according to these drawings without creating any creative labor.

[0018] Figure 1 is a structural schematic diagram of a TM mode dielectric filter provided by some embodiments of the present application;

[0019] Figure 2 is Figure 1 is a sectional view of the TM mode dielectric filter shown in A-A direction;

[0020] Figure 3 is Figure 2 a sectional view of the cover plate assembly;

[0021] Figure 4 is a structural schematic view of a TM mode dielectric filter provided by some embodiments of the present application;

[0022] Figure 5 is Figure 4 is a sectional view of the TM mode dielectric filter along the B-B direction shown in the figure;

[0023] Figure 6 is a structural schematic view of a cover plate assembly provided by some embodiments of the present application;

[0024] Figure 7 is a structural schematic view of a cover plate assembly provided by some embodiments of the present application;

[0025] Figure 8 is a structural schematic view of a TM mode dielectric filter provided by some embodiments of the present application.

[0026] The meanings of the labels in the figures are as follows:

[0027] 100, TM mode dielectric filter;

[0028] 10, cavity;

[0029] 11, support platform;

[0030] 12, positioning boss;

[0031] 20, dielectric resonator;

[0032] 21, through hole;

[0033] 30, cover plate assembly;

[0034] 31, cover plate; 311, fixed part; 3111, limiting body; 3112, fixed body; 31121, avoiding groove; 312, deformed part;

[0035] 32, rotating part; 321, first threaded hole; 322, operation hole;

[0036] 33, adjusting part; 331, second threaded hole;

[0037] 34, accommodating groove;

[0038] 35, annular groove;

[0039] 36, tuning part; 361, limiting part;

[0040] 37, locking nut. DETAILED DESCRIPTION

[0041] The embodiments of the technical solutions of the present application will be described in detail below with reference to the drawings. The following embodiments are only used to more clearly illustrate the technical solutions of the present application, and therefore only serve as examples, and cannot limit the protection scope of the present application.

[0042] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which the present application belongs; the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit the present application; the terms "include" and "have" and any variations thereof in the specification and claims of the present application and the above description of drawings are intended to cover non-exclusive inclusion.

[0043] In the description of the embodiments of the present application, the technical terms "first", "second", etc. are only used to distinguish different objects, and cannot be understood as indicating or implying relative importance or implicitly indicating the number, specific order or primary and secondary relationship of the indicated technical features. In the description of the embodiments of the present application, the meaning of "a plurality of" is two or more, unless otherwise explicitly and specifically limited.

[0044] In this paper, the reference to "embodiments" means that the specific features, structures or properties described in conjunction with the embodiments can be included in at least one embodiment of the present application. The appearance of this phrase in various places in the specification does not necessarily mean the same embodiment, nor is it an independent or alternative embodiment to other embodiments. The skilled person in the art explicitly and implicitly understands that the embodiments described herein can be combined with other embodiments.

[0045] In the description of the embodiments of the present application, the term "and / or" is only a description of the association relationship between the associated objects, which means that there can be three relationships, for example, A and / or B, which can represent the three cases of A alone, A and B together, and B alone. In addition, the character " / " in this paper generally represents that the front and rear associated objects are a "or" relationship.

[0046] In the description of the embodiments of the present application, the term "a plurality of" refers to two or more (including two), and similarly, "a plurality of groups" refers to two or more groups (including two groups), and "a plurality of pieces" refers to two or more pieces (including two pieces).

[0047] In the description of the embodiments of the present application, the orientations or positional relationships indicated by the technical terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. are based on the orientations or positional relationships shown in the drawings, and are only for the convenience of describing the embodiments of the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the embodiments of the present application.

[0048] In the description of the embodiments of the present application, unless otherwise explicitly specified and limited, the technical terms "mounting", "connecting", "connecting", "fixing", etc. should be understood in a broad sense, for example, can be fixedly connected, or can be detachably connected, or can be integrated; can be mechanically connected, or can be electrically connected; can be directly connected, or can be indirectly connected through an intermediate medium; can be the internal communication of two elements or the interaction relationship between two elements. For those skilled in the art, the specific meanings of the above terms in the embodiments of the present application can be understood according to the specific circumstances.

[0049] The embodiments of the first aspect of the present application propose a TM mode dielectric filter. Please refer to Figures 1 to 3 The TM mode dielectric filter 100 includes a cavity 10, a dielectric resonator 20, and a cover plate assembly 30. The dielectric resonator 20 is in the cavity 10, and the cover plate assembly 30 includes a cover plate 31, a rotating piece 32, and an adjusting piece 33. The cover plate 31 covers the opening of the cavity 10, and the cover plate 31 includes a fixed part 311 and a deformed part 312, which enclose a receiving groove 34. The rotating piece 32 is rotatably installed on the fixed part 311, and the rotating piece 32 has a first threaded hole 321. The adjusting piece 33 is in the receiving groove 34 and is threadedly connected with the first threaded hole 321. An end of the adjusting piece 33 close to the deformed part 312 is fixedly connected with the deformed part 312.

[0050] The shape of the cavity 10 is not limited in the present application. For example, the shape of the cavity 10 can be a cylindrical structure, an elliptical cylindrical structure, a prismatic structure, etc. When the cavity 10 is a prismatic structure, the cavity 10 can be a four-prismatic structure, a five-prismatic structure, a six-prismatic structure, etc. The cavity 10 is made of a metal material, for example, the metal material can be aluminum, iron, steel, copper, etc.

[0051] The dielectric resonator 20 is located in the cavity 10. It can be understood that the dielectric resonator 20 can be located at the center of the cavity 10, that is, the central axis of the dielectric resonator 20 coincides with the central axis of the cavity 10; or the dielectric resonator 20 can also be located away from the center of the cavity 10, that is, the central axis of the dielectric resonator 20 is parallel to the central axis of the cavity 10. The dielectric resonator 20 can be a block structure, a columnar structure, a cylindrical structure or a ring structure, that is, the dielectric resonator 20 can have a through hole 21 or can not have a through hole 21.

[0052] Optionally, the dielectric resonator 20 is made of ceramic material.

[0053] The cover plate 31 is capped at the opening of the cavity 10 to tightly fix the dielectric resonator 20 in the cavity 10, that is, the upper end of the dielectric resonator 20 abuts against the cover plate 31 and the lower end abuts against the bottom of the cavity 10 to achieve double-end grounding. The cover plate 31 is made of metal material, for example, the metal material can be aluminum, iron, steel, copper, etc.

[0054] It can be understood that the cover plate 31 can be integrally formed, that is, the thinned area in the middle of the cover plate 31 forms a deformed part 312 and the non-thinned area at the edge of the cover plate 31 forms a fixed part 311; or the cover plate 31 includes a ring plate and a deformed plate, which can be fixedly connected by welding, bonding, fastener connection, clamping, pressure connection, riveting, etc. The fixed part 311 is located on the ring plate and the deformed part 312 is located on the deformed plate.

[0055] The cover plate 31 is fixed on the cavity 10 through the fixed part 311. The fixed part 311 can be fixed on the cavity 10 by welding, fastener connection, bonding, clamping, riveting, pressure connection, etc. The deformed part 312 can be deformed under external force to approach and tightly press the dielectric resonator 20.

[0056] The fixed part 311 and the deformed part 312 surround the accommodating groove 34, and the opening of the accommodating groove 34 is away from the dielectric resonator 20. It can be understood that the fixed part 311 constitutes the side of the accommodating groove 34 and the deformed part 312 constitutes the bottom of the accommodating groove 34. Optionally, the accommodating groove 34 is a circular groove.

[0057] The rotating part 32 is rotationally installed on the fixed part 311. It can be understood that the rotating part 32 can only rotate in place around its own axis on the fixed part 311 and cannot move in the depth direction of the cavity 10. The depth direction of the cavity 10 is consistent with the thickness direction of the cover plate 31. Optionally, the rotating part 32 is located in the accommodating groove 34.

[0058] It can be understood that the rotating member 32 can be entirely flat; or, the rotating member 32 is recessed to form a groove on the side close to the deformed portion 312, and the groove is opposite to the deformed portion 312, so that the edge of the rotating member 32 can be as close as possible to the deformed portion 312 in the thickness direction of the cover plate 31, thereby reducing the thickness of the cover plate 31. Of course, the rotating member 32 can also be block-shaped or columnar.

[0059] The rotating member 32 can be made of a metal material, for example, the metal material can be aluminum, iron, steel, copper, etc. Alternatively, the rotating member 32 is made of a non-metal material, for example, the material of the rotating member 32 can be plastic, ceramic or wooden material.

[0060] It can be understood that the first threaded hole 321 can be provided with internal threads throughout the hole section, or can be provided with internal threads in part of the hole section.

[0061] The adjusting member 33 can be coaxially arranged with the dielectric resonator 20, or can be arranged non-coaxially with the dielectric resonator 20. Preferably, the adjusting member 33 can be coaxially arranged with the dielectric resonator 20, so that the pressing force of the deformed portion 312 on the dielectric resonator 20 is uniformly distributed.

[0062] The adjusting member 33 is threadedly connected with the first threaded hole 321, that is, the outer wall surface of the adjusting member 33 is provided with external threads. The end of the adjusting member 33 close to the deformed portion 312 is fixedly connected with the deformed portion 312. It can be understood that the adjusting member 33 can be integrally formed and fixedly connected with the deformed portion 312; or, the adjusting member 33 can be fixedly connected in a split manner on the deformed portion 312 by means of, but not limited to, welding, threaded connection, adhesion, clamping, riveting, pressure bonding, etc. When the adjusting member 33 is fixedly connected in a split manner on the deformed portion 312, the adjusting member 33 can be a screw, a stud, a screw rod, a bolt, etc.

[0063] The TM mode dielectric filter 100 provided by the embodiment has the beneficial effects that: since the rotating member 32 is rotatably installed on the fixed portion 311, the end of the adjusting member 33 close to the deformed portion 312 is fixedly connected with the deformed portion 312, and the adjusting member 33 is threadedly connected with the first threaded hole 321 on the rotating member 32, so that by rotating the rotating member 32, the adjusting member 33 can be driven to move along the depth direction of the cavity 10, thereby pressing the dielectric resonator 20 by the deformed portion 312, solving the problem that the two end faces of the dielectric resonator 20 cannot be in good contact with the cover plate 31 and the bottom of the cavity 10, and ensuring the high Q value of the TM mode dielectric filter 100.

[0064] And, in the prior art, only rely on the cover plate 31 of the deformation of the medium resonator 20 is pressed, or rely on the elasticity of the elastic piece of the medium resonator 20 is pressed, TM mode medium filter 100 after long time use, the cover plate 31 on the area of the medium resonator 20 is pressed inevitably will be aging, or the elastic piece will be aging, elasticity will gradually lose, leading to the pressing force gradually decreases or even disappears, resulting in the medium resonator 20 can not be pressed and fixed between the cover plate 31 and the bottom of the cavity 10, will greatly damage the performance of TM mode medium filter 100. Compared with the prior art, the TM mode medium filter 100 provided by the embodiment of the application can be pressed at any time by rotating the rotating piece 32, so that the deformed part 312 presses the medium resonator 20. When the pressing force of the deformed part 312 on the medium resonator 20 is weakened or lost, the rotating piece 32 can be continuously rotated, so that the deformed part 312 continues to deform towards the medium resonator 20, thereby increasing the pressing force of the deformed part 312 on the medium resonator 20. The deformed part 312 can continue to press the medium resonator 20, and the deformed part 312 can always maintain the pressing effect on the medium resonator 20, so that the medium resonator 20 can be always pressed and fixed between the cover plate 31 and the bottom of the cavity 10, thereby ensuring the performance stability of the TM mode medium filter 100.

[0065] Please refer to Figure 3 In some embodiments, the fixed part 311 includes a fixed body 3112 and a limiting body 3111 integrally formed with the fixed body 3112, and the rotating piece 32 is rotatably installed between the fixed body 3112 and the limiting body 3111.

[0066] The rotating piece 32 is rotatably installed between the fixed body 3112 and the limiting body 3111, which means that the side of the rotating piece 32 facing the deformed part 312 is limited by the fixed body 3112, and the side of the rotating piece 32 away from the deformed part 312 is limited by the limiting body 3111. Through the common limiting of the fixed body 3112 and the limiting body 3111, the rotating piece 32 cannot move in the depth direction of the cavity 10, but it is necessary to ensure that the rotating piece 32 can rotate around its own axis.

[0067] The fixed body 3112 and the limiting body 3111 integrally formed in the embodiment of the application can reduce the number of parts, facilitate the assembly of the cover plate assembly 30, and improve the production efficiency.

[0068] In other embodiments, the limiting body 3111 can be connected to the fixed body 3112 in a split manner through welding, pressure connection, riveting, fastener connection, bonding, clamping and the like. For example, please refer to Figure 6 The limiting body 3111 is a limiting clasp, which is clamped on the fixed body 3112 after the rotating piece 32 is installed on the fixed body 3112, so as to limit the rotating piece 32 in the upward direction.

[0069] Please refer to Figure 3 In some embodiments, the limiting body 3111 is a limiting flange bent on the fixing body 3112.

[0070] It can be understood that the limiting flange can be a ring-shaped flange, a C-shaped flange, or the limiting flange can include multiple flange segments extending along the fixing body 3112, so that the size of the limiting body 3111 is relatively large, which is beneficial to increase the structural strength of the limiting body 3111. When the limiting flange is a ring-shaped flange, the limiting body 3111 and the fixing body 3112 enclose a ring-shaped groove 35.

[0071] Optionally, the fixing body 3112 has a relief groove 31121 outside the limiting flange. Before bending, the limiting flange is in a vertical state, and the rotating piece 32 is placed on the fixing body 3112; during bending, the bending tool is inserted into the relief groove 31121 and pressed inward; after bending, the limiting flange is in an inclined state to limit the rotating piece 32, so that the rotating piece 32 cannot move in the depth direction of the cavity 10.

[0072] It should be noted that the limiting flange is not pressed tightly on the rotating piece 32 after bending, so as to facilitate the rotation of the rotating piece 32.

[0073] In other embodiments, please refer to Figure 4 and Figure 5 The limiting body 3111 includes multiple protrusions arranged at intervals around the adjusting piece 33.

[0074] It can be understood that the multiple protrusions can be two, three, or four or more.

[0075] The protrusions can be structures such as protruding strips, protruding blocks, protruding columns, protruding pieces, protruding flanges, and protruding points.

[0076] Optionally, the multiple protrusions are uniformly arranged at intervals in the circumferential direction of the adjusting piece 33, so as to ensure that the rotating piece 32 is uniformly stressed when rotating.

[0077] The forming method of the protrusions is not limited in the present application. For example, the protrusions can be obtained by locally stamping the fixing part 311; or the protrusions can be obtained by flowing after local high-temperature melting of the fixing part 311, such as laser melting, friction melting, etc.

[0078] It should be noted that the method of obtaining the protrusions by flowing after local high-temperature melting of the fixing part 311 needs to ensure that the melting point of the fixing part 311 is lower than the melting point of the rotating piece 32, that is, after local melting of the fixing part 311, the rotating piece 32 will not melt, so as to avoid that the protrusions and the rotating piece 32 are welded together and affect the rotation of the rotating piece 32. For example, the rotating piece 32 can be made of steel material, and the fixing part 311 can be made of aluminum material.

[0079] Based on the above scheme, the installation of the rotating member 32 is facilitated, the rotating member 32 does not need to be provided with an installation portion on the outer wall surface thereof, and the assembly groove does not need to be machined on the limiting body 3111, thereby reducing the machining process.

[0080] In other embodiments, the annular groove 35 can be directly formed on the groove side wall of the accommodating groove 34, and the upper side groove wall of the annular groove 35 constitutes the limiting body 3111, that is, the limiting body 3111 is not formed by bending; wherein the installation portion is provided on the outer wall surface of the rotating member 32, and the assembly groove is machined on the limiting body 3111, and the installation portion can pass through the assembly groove into the annular groove 35 to achieve the installation of the rotating member 32. Optionally, the number of installation portions can be equal to or less than the number of assembly grooves, and the shape of the installation portion can be the same as or different from the shape of the assembly groove, as long as the installation portion can pass through the assembly groove; when the shape of the installation portion is the same as the shape of the assembly groove, both can be semicircular, rectangular, triangular, trapezoidal, etc.

[0081] In some embodiments, the rotating member 32 is a plate-shaped structure or a sheet-shaped structure.

[0082] Optionally, the rotating member 32 is a disc-shaped plate-shaped structure or a sheet-shaped structure.

[0083] The rotating member 32 is a plate-shaped structure or a sheet-shaped structure, which is easy to process, facilitates installation and rotation operation, and is relatively light in weight, which is beneficial to reduce the weight of the TM mode dielectric filter 100.

[0084] Please refer to Figure 3 In some embodiments, the rotating member 32 is provided with an operation hole 322. Wherein the hand or external tool is inserted into the operation hole 322 to drive the rotating member 32 to rotate.

[0085] It can be understood that the number of operation holes 322 can be one or more. When the number of operation holes 322 is more than one, the plurality of operation holes 322 are uniformly arranged along the circumference of the rotating member 32.

[0086] By adopting the above technical scheme, the operation hole 322 is used to facilitate the driving of the rotating member 32 to rotate.

[0087] In other embodiments, the operation hole 322 can not be provided on the rotating member 32, and an operation protrusion is provided on the side of the rotating member 32 away from the dielectric resonator 20, and the hand or external tool drives the rotating member 32 to rotate through the operation protrusion. Of course, the operation protrusion can also be provided on the side of the rotating member 32 away from the dielectric resonator 20 in the case that the operation hole 322 is provided on the rotating member 32.

[0088] In some embodiments, the adjusting member 33 is integrally formed with the deformed portion 312, which reduces the number of parts, facilitates the assembly of the cover plate assembly 30, and improves the production efficiency. In particular, in the case where the adjusting member 33 has the second threaded hole 331 and the TM mode dielectric filter 100 further comprises the tuning member 36 threadedly connected in the second threaded hole 331, the adjusting member 33 is integrally formed with the deformed portion 312, which is more conducive to making the adjusting member 33 larger in size and facilitating the machining of the second threaded hole 331. Compared with the case where the adjusting member 33 is separately connected with the deformed portion 312, the second threaded hole 331 does not need to be machined on the adjusting member 33 and the deformed portion 312 respectively, and the second threaded holes 331 of the two do not need to be aligned. The second threaded hole 331 can be machined at one time and does not need to be aligned, which reduces the machining process and assembly difficulty, and also facilitates the adjusting member 33 to be more stably installed in the second threaded hole 331.

[0089] In other embodiments, the adjusting member 33 is welded on the deformed portion 312. For example, the adjusting member 33 can be welded on the deformed portion 312 by laser welding, ultrasonic welding, or the like. Optionally, the adjusting member 33 and the deformed portion 312 are made of the same material, which facilitates the welding of the adjusting member 33 on the deformed portion 312. For example, the adjusting member 33 and the deformed portion 312 are both made of aluminum.

[0090] Please refer to Figure 2 and Figure 3 In some embodiments, the dielectric resonator 20 has the through hole 21, the adjusting member 33 has the second threaded hole 331, the TM mode dielectric filter 100 further comprises the tuning member 36 threadedly connected in the second threaded hole 331, and the locking nut 37 threadedly connected on the tuning member 36, and the tuning member 36 extends into the through hole 21.

[0091] It can be understood that the second threaded hole 331 penetrates through the adjusting member 33 and the deformed portion 312, and the second threaded hole 331 can be provided with internal threads throughout the entire hole section or partially.

[0092] The dielectric resonator 20 has the through hole 21 arranged along the depth direction of the cavity 10, and the tuning member 36 penetrates the second threaded hole 331 and extends into the through hole 21.

[0093] The tuning member 36 is threadedly connected with the second threaded hole 331, i.e., the outer wall surface of the tuning member 36 is provided with external threads. The tuning member 36 can be a screw, a stud, a screw rod, a bolt, or the like.

[0094] The locking nut 37 is threadedly connected on the tuning member 36 and abuts against the end face of the adjusting member 33 away from the dielectric resonator 20, so as to lock the tuning member 36 on the adjusting member 33.

[0095] In use, first loosen the locking nut 37, then rotate the tuning member 36 to adjust the depth of the tuning member 36 extending into the through hole 21 of the dielectric resonator 20, so as to adjust the resonant frequency; after adjustment, tighten the locking nut 37 again to avoid rotation of the tuning member 36, so as to ensure that the adjusted resonant frequency will not change.

[0096] In other embodiments, the second threaded hole 331 can not be arranged on the adjusting member 33, and the tuning member 36 and the locking nut 37 can not be arranged; other ways can be used to adjust the resonant frequency, or the resonant frequency can not be adjusted.

[0097] Please refer to Figure 2 and Figure 3 In some embodiments, the tuning member 36 is provided with a limiting portion 361 at the end away from the dielectric resonator 20, and the limiting portion 361 is used to limit the depth of the tuning member 36 extending into the through hole 21.

[0098] It can be understood that the limiting portion 361 can be an annular structure; or the limiting portion 361 can be one or more limiting protrusions protruding from the outer wall surface of the tuning member 36, and when there are multiple limiting protrusions, the limiting protrusions are arranged at intervals along the circumference of the tuning member 36.

[0099] When the limiting portion 361 can be an annular structure, the tuning member 36 can be a bolt, that is, the head of the tuning member 36 constitutes the limiting portion 361. Among them, the head of the tuning member 36 is clamped by an operating tool to drive the tuning member 36 to rotate.

[0100] By arranging the limiting portion 361 at the end of the tuning member 36 away from the dielectric resonator 20, in the process of rotating the tuning member 36 to approach the dielectric resonator 20, the limiting portion 361 is limited by the limiting cooperation with the locking nut 37 to limit the depth of the tuning member 36 extending into the through hole 21, so as to avoid the tuning member 36 from contacting the bottom of the cavity 10 to cause short circuit, and ensure the safety distance.

[0101] In other embodiments, as shown in Figure 7 , the limiting portion 361 can also not be arranged, and the length of the tuning member 36 satisfies that when the upper end of the tuning member 36 is flush with the locking nut 37, the lower end of the tuning member 36 does not contact the bottom of the cavity 10. Optionally, the upper end surface of the tuning member 36 has a square hole, a hexagonal hole, etc., or the outer wall surface of the tuning member 36 is milled with a flat surface, so as to facilitate the operating tool to extend in to drive the tuning member 36 to rotate.

[0102] Please refer to Figure 2 In some embodiments, the dielectric resonator 20 has a through hole 21, and the bottom of the cavity 10 is provided with a positioning boss 12 extending into the through hole 21.

[0103] Optionally, the through hole 21 is a circular hole, and correspondingly, the positioning boss 12 is a circular boss.

[0104] By extending the positioning boss 12 into the through hole 21, the positioning boss 12 limits the movement of the dielectric resonator 20 in the radial direction of the dielectric resonator 20 in the cavity 10.

[0105] In other embodiments, a positioning ring groove can be provided at the bottom of the cavity 10, and the lower end of the dielectric resonator 20 is inserted into the positioning ring groove. The positioning ring groove limits the movement of the dielectric resonator 20 in the radial direction of the dielectric resonator 20 in the cavity 10. Alternatively, neither the positioning ring groove nor the positioning boss 12 is provided at the bottom of the cavity 10, but the friction between the lower end of the dielectric resonator 20 and the bottom of the cavity 10 is used to limit the movement of the dielectric resonator 20 in the radial direction of the dielectric resonator 20 in the cavity 10.

[0106] Please refer to Figure 2 In some embodiments, the bottom of the cavity 10 is also provided with a support platform 11, and the positioning boss 12 is located on the support platform 11.

[0107] In the radial direction of the dielectric resonator 20, the size of the support platform 11 is greater than the size of the positioning boss 12, that is, the projection of the positioning boss 12 in the depth direction of the cavity 10 is within the projection of the support platform 11 in the depth direction of the cavity 10, and the lower end of the dielectric resonator 20 is supported on the support platform 11. The support platform 11 is made of a metal material to realize the grounding of the lower end of the dielectric resonator 20.

[0108] It can be understood that the positioning boss 12 can be integrally formed with the support platform 11, or the positioning boss 12 can be fixed on the support platform 11 by welding, bonding, threaded connection, pressure connection, riveting, etc.

[0109] It can be understood that the support platform 11 can be integrally formed with the bottom wall of the cavity 10, that is, the positioning boss 12, the support platform 11 and the bottom wall of the cavity 10 are integrally formed; or the support platform 11 can be fixed on the bottom wall of the cavity 10 by welding, bonding, threaded connection, pressure connection, riveting, etc.

[0110] In other embodiments, as Figure 8 shown, the support platform 11 can not be provided, and the lower end of the dielectric resonator 20 is supported on the bottom wall of the cavity 10. The positioning boss 12 can be integrally formed with the bottom wall of the cavity 10, or the positioning boss 12 can be fixed on the bottom wall of the cavity 10 by welding, bonding, threaded connection, pressure connection, riveting, etc.

[0111] The above examples are only used to illustrate the technical solutions of the present application, but not limit the same; although the present application has been described in detail with reference to the foregoing examples, those skilled in the art should understand that the technical solutions recorded in the foregoing examples can be modified, or some technical features can be replaced by equivalent ones; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present application, and should be included in the protection scope of the present application.

Claims

1. A TM mode dielectric filter characterized by: The application relates to a TM mode dielectric resonator filter, which comprises a cavity, a dielectric resonator and a cover plate assembly, the dielectric resonator being in the cavity, the cover plate assembly comprising a cover plate, a rotating piece and an adjusting piece, the cover plate covering the opening of the cavity, the cover plate comprising a fixed part and a deformed part, the fixed part and the deformed part surrounding a containing groove, the rotating piece being rotatably installed on the fixed part, the rotating piece having a first threaded hole, the adjusting piece being in the containing groove and being threadedly connected with the first threaded hole, one end of the adjusting piece close to the deformed part being fixedly connected with the deformed part.

2. The TM mode dielectric filter as claimed in claim 1, wherein: The fixed part comprises a fixed body and a limiting body which is integrally formed with the fixed body, and the rotating piece is rotatably installed between the fixed body and the limiting body.

3. The TM mode dielectric filter as claimed in claim 2, wherein: the dielectric rod is formed of a dielectric material having a dielectric constant of 10 or more. The limiting body is a limiting flange which is bent on the fixed body, or the limiting body comprises a plurality of convex parts which are arranged along the circumference of the fixed body.

4. The TM mode dielectric filter as claimed in claim 1, wherein: The rotating piece is in a sheet structure or a plate structure.

5. The TM mode dielectric filter as claimed in claim 4, wherein: the dielectric material is formed of a ceramic material. An operation hole is arranged on the rotating piece.

6. The TM mode dielectric filter as claimed in any one of claims 1 to 5, wherein: The adjusting piece is integrally connected with the deformed part, or the adjusting piece is welded on the deformed part.

7. The TM mode dielectric filter as claimed in any one of claims 1 to 5, wherein: The dielectric resonator has a through hole, the adjusting piece has a second threaded hole, the TM mode dielectric filter further comprises a tuning piece which is threadedly connected in the second threaded hole, and a locking nut which is threadedly connected on the tuning piece, and the tuning piece extends into the through hole.

8. The TM mode dielectric filter as claimed in claim 7, wherein: A limiting part is arranged on one end of the tuning piece away from the dielectric resonator, and the limiting part is used for limiting the depth of the tuning piece extending into the through hole.

9. The TM mode dielectric filter as claimed in any one of claims 1 to 5, wherein: The dielectric resonator has a through hole, and the bottom of the cavity is provided with a positioning boss which extends into the through hole.

10. The TM mode dielectric filter as claimed in claim 9, wherein: The bottom of the cavity is further provided with a supporting table, and the positioning boss is on the supporting table.

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