Multi-mode dielectric filter

Abstract

The utility model relates to the technical field of filters, and provides a multi-mode dielectric filter, which comprises a cavity and a multi-mode resonator, an insertion positioning structure is arranged between the bottom wall of the cavity and the multi-mode resonator, and the insertion positioning structure is used for preventing the multi-mode resonator from rotating relative to the bottom wall of the cavity. After the multi-mode resonator in the multi-mode dielectric filter is mounted in the cavity, the multi-mode resonator can be prevented from rotating relative to the bottom wall of the cavity through the insertion positioning structure, so that the multi-mode resonator is positioned and mounted in the cavity at a preset angle, and the relative position of the multi-mode resonator and the cavity is ensured; as the multimode resonator can be positioned and mounted in the cavity without a positioning clamp, the mounting and dismounting of the positioning clamp are omitted, and the problem of low mounting efficiency of the multimode resonator is solved.

Description

Technical Field

[0001] The present application relates to the technical field of filters, and in particular to a multimode dielectric filter. Background Art

[0002] Generally, a multimode dielectric filter includes a cavity, a cover plate, a multimode resonator, an adjusting screw, and a fastening screw, etc. The multimode resonator includes an insulating bracket and a dielectric resonator fixed on the insulating bracket, and the insulating bracket is fixed to the bottom wall of the cavity by a fastening screw; the dielectric resonator is provided with a plurality of resonant holes, and the adjusting screw is provided on the cover plate and can extend into the resonant hole to adjust the resonant frequency. When the dielectric resonator is installed in the cavity, the plurality of resonant holes on it need to be located at a preset position. Therefore, it is necessary to position the multimode resonator when installing it.

[0003] At present, the multi-mode resonator is positioned by a positioning fixture. Specifically, the positioning fixture is provided with a first positioning pin and a second positioning pin. The first positioning pin cooperates with the threaded hole on the cavity, and the second positioning pin cooperates with the resonant hole of the multi-mode resonator to achieve accurate positioning of the multi-mode resonator. Since the positioning fixture needs to be installed and disassembled when positioning the multi-mode resonator, the installation efficiency of the multi-mode resonator is affected. Utility Model Content

[0004] In view of this, an embodiment of the present application provides a multi-mode dielectric filter to solve the problem of low installation efficiency of multi-mode resonators.

[0005] An embodiment of the present application proposes a multimode dielectric filter, comprising a cavity and a multimode resonator, wherein a plug-in positioning structure is provided between the bottom wall of the cavity and the multimode resonator, and the plug-in positioning structure is used to prevent the multimode resonator from rotating relative to the bottom wall of the cavity.

[0006] The multimode dielectric filter provided in the embodiment of the present application includes a cavity and a multimode resonator. By setting a plug-in positioning structure between the bottom wall of the cavity and the multimode resonator, after the multimode resonator is installed in the cavity, the positioning structure can prevent the multimode resonator from rotating relative to the bottom wall of the cavity, thereby positioning the multimode resonator in the cavity at a preset angle to ensure the relative position of the multimode resonator and the cavity. Since the above-mentioned multimode resonator can be positioned and installed in the cavity without a positioning fixture, the installation and removal of the positioning fixture is omitted, and the problem of low installation efficiency of the multimode resonator is solved.

[0007] In some embodiments, the plug-in positioning structure includes a positioning groove and a positioning protrusion, one of the positioning groove and the positioning protrusion is arranged on the bottom wall of the cavity, and the other of the positioning groove and the positioning protrusion is arranged on the multi-mode resonator.

[0008] In some embodiments, the positioning groove and the positioning protrusion are respectively arranged asymmetrically with respect to a center line of the multi-mode resonator.

[0009] In some embodiments, projections of the positioning groove and the positioning protrusion in the axial direction of the multi-mode resonator are both non-circular, and the positioning groove and the positioning protrusion are respectively arranged symmetrically with respect to the center line of the multi-mode resonator.

[0010] In some embodiments, a fixing portion is provided on the bottom wall of the cavity, the multi-mode resonator includes a dielectric resonator and a connecting portion fixed on the dielectric resonator, one of the positioning groove and the positioning protrusion is provided on the fixing portion, and the other of the positioning groove and the positioning protrusion is provided on the connecting portion.

[0011] In some embodiments, one of the positioning groove and the positioning protrusion is provided on the end surface of the fixing portion facing the connecting portion, and the other of the positioning groove and the positioning protrusion is provided on the end surface of the connecting portion facing the fixing portion.

[0012] In some embodiments, one of the fixing portion and the connecting portion is provided with a slot, and the other of the fixing portion and the connecting portion is provided with an insertion section; one of the positioning groove and the positioning protrusion is provided on the side wall of the slot, and the other of the positioning groove and the positioning protrusion is provided on the outer peripheral wall of the insertion section.

[0013] In some embodiments, the multimode dielectric filter further includes a fastening screw, and the connecting portion is fixed to the fixing portion by the fastening screw.

[0014] In some embodiments, a flat-bottomed groove is provided on a side of the connecting portion facing away from the fixing portion, and the head of the fastening screw is a flat head, and the head of the fastening screw abuts against the inner bottom wall of the flat-bottomed groove.

[0015] In some embodiments, the dielectric resonator is a cylindrical structure having a central hole and a plurality of resonance holes arranged around the central hole, and the central hole is for the fastening screw to pass through.

[0016] The above description is only an overview of the technical solution of the present application. In order to more clearly understand the technical means of the present application, it can be implemented in accordance with the contents of the specification. In order to make the above and other purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are listed below. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the embodiments or conventional technical descriptions will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0018] Figure 1 is a schematic diagram of the structure of a multimode dielectric filter provided in some embodiments of the present application;

[0019] Figure 2 yes Figure 1 A cross-sectional view of the multimode dielectric filter shown;

[0020] Figure 3 yes Figure 1 An exploded view of the multimode dielectric filter from a first perspective;

[0021] Figure 4 yes Figure 3 A schematic structural diagram of the cavity of the multimode dielectric filter shown;

[0022] Figure 5 yes Figure 1 An exploded view of the multimode dielectric filter from a second perspective;

[0023] Figure 6 yes Figure 5 A schematic structural diagram of a multimode resonator of the multimode dielectric filter shown;

[0024] Figure 7 is a schematic structural diagram of a cavity provided in some other embodiments of the present application;

[0025] Figure 8 It is a schematic diagram of the structure of a multi-mode resonator provided in other embodiments of the present application.

[0026] The meanings of the marks in the figure are:

[0027] 10. Multimode dielectric filter;

[0028] 11. cavity; 111. fixing portion; 1111. threaded hole; 1112. slot;

[0029] 12. multimode resonator; 121. dielectric resonator; 1211. resonant hole; 1212. center hole; 122. connecting part; 1221. flat bottom groove; 1222. perforation; 1223. plug-in section;

[0030] 13. Cover plate; 131. Adjusting screw;

[0031] 14. Insertion positioning structure; 141. Positioning groove; 142. Positioning protrusion;

[0032] 15. Tighten the screws;

[0033] 16. Fixing screws. DETAILED DESCRIPTION

[0034] The following embodiments of the technical solution of the present application are described in detail in conjunction with the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present application, and are therefore only used as examples, and cannot be used to limit the scope of protection of the present application.

[0035] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by technicians in the technical field to which this application belongs; the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" in the specification and claims of this application and the above-mentioned figure descriptions and any variations thereof are intended to cover non-exclusive inclusions.

[0036] 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 "multiple" is more than two, unless otherwise clearly and specifically defined.

[0037] Reference to "embodiments" herein means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present application. The appearance of the phrase in various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0038] In the description of the embodiments of the present application, the term "and / or" is only a description of the association relationship of the associated objects, indicating that there may be three relationships. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this article generally indicates that the associated objects before and after are in an "or" relationship.

[0039] In the description of the embodiments of the present application, the term "multiple" refers to more than two (including two). Similarly, "multiple groups" refers to more than two groups (including two groups), and "multiple pieces" refers to more than two pieces (including two pieces).

[0040] In the description of the embodiments of the present application, the orientations or positional relationships indicated by technical terms such as "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "vertical", "horizontal", "top", "bottom", "inside" and "outside" are based on the orientations or positional relationships shown in the accompanying drawings. They 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 referred device or element must have a specific orientation, be constructed and operated in a specific orientation. Therefore, they should not be understood as limitations on the embodiments of the present application.

[0041] In the description of the embodiments of the present application, unless otherwise clearly specified and limited, technical terms such as "installed", "connected", "connected", "fixed" 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, and it can be the internal connection of two elements or the interaction relationship between two elements. For those of ordinary skill 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.

[0042] In a multimode dielectric filter, based on the selection and design of the resonance mode, the position of the excitation end, and the position of the tuning screw on the cover plate, when the multimode dielectric resonator is installed in the cavity, it is necessary to ensure that the multiple resonant holes on the multimode dielectric resonator are located at preset positions in the cavity. The traditional positioning method is to position the multimode resonator by a positioning fixture. Specifically, the positioning fixture is provided with a first positioning pin and a second positioning pin. The first positioning pin cooperates with the threaded hole on the cavity to fix the position of the positioning fixture relative to the cavity, and the second positioning pin cooperates with the resonant hole of the multimode resonator to achieve precise positioning of the resonant hole on the multimode resonator and the cavity.

[0043] Research has found that when installing a multi-mode resonator, a positioning fixture needs to be installed and disassembled, which affects the installation efficiency of the multi-mode resonator.

[0044] In order to solve the problem of low installation efficiency of multi-mode resonators, an embodiment of the present application provides a multi-mode dielectric filter.

[0045] Please also refer to Figure 1 and Figure 2 The multimode dielectric filter 10 includes a cavity 11 and a multimode resonator 12. A plug-in positioning structure 14 is provided between the bottom wall of the cavity 11 and the multimode resonator 12. The plug-in positioning structure 14 is used to prevent the multimode resonator 12 from rotating relative to the bottom wall of the cavity 11.

[0046] The cavity 11 is used to accommodate the multimode resonator 12. The shape of the cavity 11 is not limited in this application. It can be understood that the cavity 11 can be a regular cavity, such as a circular cavity, a rectangular cavity, a square cavity, etc.; the cavity 11 can also be an irregular cavity. Among them, the cavity 11 is made of metal material, and the metal material can be aluminum, copper, etc.

[0047] Optionally, the multi-mode resonator 12 is a dual-mode resonator, which is usually composed of two resonant circuits and has two resonant modes. In this case, the multi-mode resonator 12 is equivalent to two single-mode dielectric resonators, which can simultaneously generate two frequency-stable oscillation signals; moreover, when one of the resonant circuits generates a vibration signal, it can transfer part of the energy to the other resonant circuit, thereby causing the oscillation of the other resonant circuit. In other embodiments, the multi-mode resonator 12 can be a three-mode resonator.

[0048] The mode of the multi-mode resonator 12 may be a TE mode, a TM mode, a TEM mode, etc., which is not limited in this embodiment.

[0049] The multi-mode resonator 12 may have various shapes, for example, a cylindrical structure, a prismatic structure, a square structure, a cross structure, etc.

[0050] The multimode dielectric filter 10 provided in the embodiment of the present application includes a cavity 11 and a multimode resonator 12. A plug-in positioning structure 14 is provided between the bottom wall of the cavity 11 and the multimode resonator 12. After the multimode resonator 12 is installed in the cavity 11, the plug-in positioning structure 14 can prevent the multimode resonator 12 from rotating around the multimode resonator 12 relative to the bottom wall of the cavity 11 in the circumferential direction, thereby positioning the multimode resonator 12 at a preset angle in the cavity 11. Since the multimode resonator 12 can be positioned and installed in the cavity 11 without a positioning fixture, the installation and removal of the positioning fixture is omitted, and the problem of low installation efficiency of the multimode resonator 12 is solved.

[0051] The multimode resonator 12 has a center line perpendicular to the bottom wall of the cavity 11, and the circumferential direction of the multimode resonator 12 refers to the direction around the center line of the multimode resonator 12. Figure 3 Direction indicated by the arrow.

[0052] Please also refer to Figure 2 , Figure 3 and Figure 5 In some embodiments, the plug-in positioning structure 14 includes a positioning groove 141 and a positioning protrusion 142, one of the positioning groove 141 and the positioning protrusion 142 is disposed on the bottom wall of the cavity 11, and the other of the positioning groove 141 and the positioning protrusion 142 is disposed on the multi-mode resonator 12.

[0053] It can be understood that the positioning groove 141 can be provided on the bottom wall of the cavity 11 and the positioning protrusion 142 can be provided on the multimode resonator 12; or, the positioning groove 141 can be provided on the multimode resonator 12 and the positioning protrusion 142 can be provided on the bottom wall of the cavity 11.

[0054] The positioning protrusion 142 is located in the positioning groove 141 , and the gap between the two opposite side walls of the positioning groove 141 in the circumferential direction of the multi-mode resonator 12 and the positioning protrusion 142 is small to ensure positioning accuracy.

[0055] Optionally, the size of the positioning groove 141 in the radial direction of the multi-mode resonator 12 may be greater than or equal to the size of the positioning protrusion 142 in the radial direction of the multi-mode resonator 12 .

[0056] In the present application, the shapes of the positioning protrusion 142 and the positioning groove 141 can be various. For example, the positioning protrusion 142 is a rectangular protrusion, and the positioning groove 141 is a rectangular groove; or, the positioning protrusion 142 is a trapezoidal protrusion, and the positioning groove 141 is a trapezoidal groove. In this case, the number of the positioning protrusion 142 and the positioning groove 141 can be unlimited, such as one, two, or three or more, all of which can achieve anti-rotation. Alternatively, the positioning protrusion 142 is a circular protrusion, and the positioning groove 141 is a circular groove. In this case, the number of the positioning protrusion 142 and the positioning groove 141 needs to be set to two or more to achieve anti-rotation.

[0057] The plug-in positioning structure 14 provided in the embodiment of the present application includes a positioning groove 141 and a positioning protrusion 142 . Both the positioning groove 141 and the positioning protrusion 142 are easy to process, which is beneficial for their manufacture on the bottom wall of the cavity 11 and the multi-mode resonator 12 , respectively.

[0058] In other embodiments, the plug-in positioning structure 14 includes a positioning column and a positioning hole for positioning cooperation, one of which is disposed on the bottom wall of the cavity 11 , and the other of which is disposed on the multi-mode resonator 12 .

[0059] In some embodiments, the positioning groove 141 and the positioning protrusion 142 are respectively arranged asymmetrically with respect to the center line of the multi-mode resonator 12 .

[0060] For example, when there are two positioning grooves 141 and two positioning protrusions 142, the central angle of the two positioning grooves 141 corresponding to the center line of the multi-mode resonator 12 can be 30°, 60°, 90° or 120°, etc., and the central angle of the two positioning protrusions 142 corresponding to the center line of the multi-mode resonator 12 can be 30°, 60°, 90°, 120°, etc.

[0061] For example, when there are three or more positioning grooves 141 and positioning protrusions 142, the positioning grooves 141 are unevenly arranged along the circumference of the multi-mode resonator 12, that is, the distance between two adjacent positioning grooves 141 is different; the positioning protrusions 142 are unevenly arranged along the circumference of the multi-mode resonator 12, that is, the distance between two adjacent positioning protrusions 142 is different.

[0062] The embodiment of the present application achieves a fool-proof function by arranging the positioning groove 141 and the positioning protrusion 142 in a non-center-symmetrical manner. When installing the multi-mode resonator 12, especially when installing a multi-mode resonator 12 with a center-symmetrical structure such as a cylindrical shape, and the multiple resonance holes 1211 on the multi-mode resonator 12 are also arranged center-symmetrically, the operator does not need to carefully observe with the naked eye to distinguish the front and back end faces of the multi-mode resonator 12, nor does the operator need to spend time and effort to align the multi-mode resonator 12 with respect to the cavity 11 at a preset position during installation, thereby avoiding the problem of rework due to incorrect installation of the multi-mode resonator 12 in the cavity 11, and also improving the installation efficiency of the multi-mode resonator 12 and reducing the difficulty of installation.

[0063] Please also refer to Figure 4 and Figure 6 In some embodiments, the projections of the positioning groove 141 and the positioning protrusion 142 in the axial direction of the multi-mode resonator 12 are both non-circular, and the positioning groove 141 and the positioning protrusion 142 are respectively arranged symmetrically with respect to the center line of the multi-mode resonator 12 .

[0064] The projections of the positioning groove 141 and the positioning protrusion 142 in the axial direction of the multimode resonator 12 are both non-circular, which means that the positioning groove 141 is a non-circular positioning groove 141, and the positioning protrusion 142 is a non-circular positioning protrusion. For example, the projection of the positioning groove 141 in the axial direction of the multimode resonator 12 is a rectangle, and the projection of the positioning protrusion 142 in the axial direction of the multimode resonator 12 is a rectangle; or, the projection of the positioning groove 141 in the axial direction of the multimode resonator 12 is a trapezoid, and the projection of the positioning protrusion 142 in the axial direction of the multimode resonator 12 is a trapezoid; or, the projection of the positioning groove 141 in the axial direction of the multimode resonator 12 is an ellipse, and the projection of the positioning protrusion 142 in the axial direction of the multimode resonator 12 is an ellipse.

[0065] The positioning groove 141 and the positioning protrusion 142 are respectively arranged symmetrically with respect to the center line of the multi-mode resonator 12. It can be considered that the positioning groove 141 and the positioning protrusion 142 are uniformly arranged along the circumference of the multi-mode resonator 12. For example, there are two positioning grooves 141 and two positioning protrusions 142 arranged symmetrically, that is, the two positioning grooves 141 and the two positioning protrusions 142 are arranged in a straight line, and the center angle of the two positioning grooves 141 corresponding to the center line of the multi-mode resonator 12 is 180°, and the center angle of the two positioning protrusions 142 corresponding to the center line of the multi-mode resonator 12 is 180°.

[0066] For example, there are three positioning grooves 141 and three positioning protrusions 142 arranged symmetrically, that is, the three positioning grooves 141 and the three positioning protrusions 142 are arranged in a triangular shape, and the central angle corresponding to the center line of the multi-mode resonator 12 between any two positioning grooves 141 is 120°, and the central angle corresponding to the center line of the multi-mode resonator 12 between any two positioning protrusions 142 is 120°.

[0067] For example, there are four positioning grooves 141 and four positioning protrusions 142 arranged symmetrically, that is, the four positioning grooves 141 and the four positioning protrusions 142 are arranged in a cross shape, and the central angle corresponding to the center line of the multi-mode resonator 12 between any two positioning grooves 141 is 90°, and the central angle corresponding to the center line of the multi-mode resonator 12 between any two positioning protrusions 142 is 90°.

[0068] By adopting the above technical solution, when the positioning groove 141 and the positioning protrusion 142 are positioned and matched, the force is relatively uniform, which further ensures the stability of positioning; at the same time, it is beneficial to the processing of the positioning groove 141 and the positioning protrusion 142.

[0069] In some embodiments, a fixing portion 111 is provided on the bottom wall of the cavity 11, the multimode resonator 12 includes a dielectric resonator 121 and a connecting portion 122 fixed on the dielectric resonator 121, one of the positioning groove 141 and the positioning protrusion 142 is provided on the fixing portion 111, and the other of the positioning groove 141 and the positioning protrusion 142 is provided on the connecting portion 122.

[0070] It can be understood that the positioning groove 141 can be a through groove extending radially along the fixing portion 111 or the connecting portion 122 and open at both ends; or, the positioning groove 141 can be a single-ended through groove extending radially along the fixing portion 111 or the connecting portion 122 and open at one end; or, the positioning groove 141 can be a closed groove extending radially along the fixing portion 111 or the connecting portion 122 and closed at both ends, that is, the two ends of the positioning groove 141 in the radial direction of the fixing portion 111 or the connecting portion 122 are closed structures.

[0071] Optionally, the dielectric resonator 121 is a ceramic dielectric resonator.

[0072] Optionally, the connecting portion 122 is an insulating bracket, for example, an alumina bracket. The alumina material is more wear-resistant and has higher strength.

[0073] Optionally, the connection part 122 and the dielectric resonator 121 are fixedly connected by bonding, so that the connection part 122 and the dielectric resonator 121 are more convenient. In other embodiments, the connection part 122 and the dielectric resonator 121 can also be fixedly connected by plugging, snapping, fastener connection, etc. Since the dielectric resonator 121 is usually brittle, if the connection part 122 and the dielectric resonator 121 are an integral structure, it is easy to generate cracks when the connection part 122 is fixed to the fixing part 111 (for example, when the connection part 122 is fixed to the fixing part 111 by crimping, threading, interference connection, fastener connection, etc.), thereby affecting the normal use of the multi-mode resonator 12; by fixing the dielectric resonator 121 and the connection part 122 separately, the connection part 122 can be made of a high-strength insulating material, so that the connection part 122 will not generate cracks when it is fixed to the fixing part 111, ensuring that the multi-mode resonator 12 can be used normally.

[0074] The fixing portion 111 may be made of metal or non-metal.

[0075] Optionally, see Figure 2 The fixing portion 111 is a convex structure such as a boss, a convex column, or a convex block. The shape of the fixing portion 111 is not limited in this application. For example, the fixing portion 111 can be a regular shape or an irregular shape. When the fixing portion 111 is a regular shape, the fixing portion 111 can be a cylindrical structure, a prism structure, a truncated cone structure, etc.

[0076] It can be understood that the fixing portion 111 can be integrally formed with the bottom wall of the cavity 11 , and the fixing portion 111 can also be fixedly connected to the bottom wall of the cavity 11 (which can be but is not limited to welding, plugging, crimping, fasteners).

[0077] By adopting the above technical solution, the fixing portion 111 protrudes from the bottom wall of the cavity 11. Under the condition of ensuring the connection stability between the fixing portion 111 and the connecting portion 122, the thickness of the bottom wall of the cavity 11 can be reduced, which is beneficial to reducing the overall weight.

[0078] When the multi-mode resonator 12 is installed in the cavity 11, since a positioning groove 141 and a positioning protrusion 142 are provided between the connecting portion 122 and the fixing portion 111, before the connecting portion 122 is fixedly connected to the fixing portion 111, the positioning groove 141 and the positioning protrusion 142 can prevent the fixing portion 111 and the connecting portion 122 from rotating relative to each other along the circumference of the multi-mode resonator 12, thereby ensuring the relative position between the multi-mode resonator 12 and the cavity 11 and realizing precise positioning of the multi-mode resonator 12.

[0079] By adopting the above technical solution, the fixing part 111 supports and elevates the multi-mode resonator 12, so that the multi-mode resonator 12 can obtain sufficient supporting strength while having better indicators. The connecting part 122 insulates the multi-mode resonator 12 from the bottom wall of the cavity 11. Based on this, a TE mode dielectric filter can be realized, so that the multi-mode resonator 12 presents a TE mode.

[0080] In other embodiments, the fixing portion 111 is not provided on the bottom wall of the cavity 11, the multimode resonator 12 does not include the connecting portion 122, the multimode resonator 12 is directly fixed on the bottom wall of the cavity 11, and a plug-in positioning structure 14 (i.e., a positioning groove 141 and a positioning protrusion 142) is provided between the multimode resonator 12 and the bottom wall of the cavity 11 to achieve anti-rotation; moreover, the top of the multimode resonator 12 abuts against the cover plate 13, so that the multimode resonator 12 is grounded at both ends, realizing a TM mode dielectric filter, and making the multimode resonator 12 present a TM mode.

[0081] Please also refer to Figure 4 and Figure 6 In some embodiments, one of the positioning groove 141 and the positioning protrusion 142 is disposed on the end surface of the fixing portion 111 facing the connecting portion 122, and the other of the positioning groove 141 and the positioning protrusion 142 is disposed on the end surface of the connecting portion 122 facing the fixing portion 111.

[0082] It can be understood that the positioning groove 141 can be arranged on the end surface of the fixing portion 111 facing the connecting portion 122, and the positioning protrusion 142 can be arranged on the end surface of the connecting portion 122 facing the fixing portion 111; or, the positioning protrusion 142 can be arranged on the end surface of the fixing portion 111 facing the connecting portion 122, and the positioning groove 141 can be arranged on the end surface of the connecting portion 122 facing the fixing portion 111.

[0083] The end surface of the fixing portion 111 facing the connecting portion 122 refers to the side of the fixing portion 111 facing the bottom wall of the cavity 11 ; the end surface of the connecting portion 122 facing the fixing portion 111 refers to the side of the connecting portion 122 facing away from the bottom wall of the cavity 11 .

[0084] The end surface of the fixing portion 111 facing the connecting portion 122 and the end surface of the connecting portion 122 facing the fixing portion 111 are both planes, which is conducive to the processing of the positioning groove 141 and the positioning protrusion 142.

[0085] Please also refer to Figure 7 and Figure 8In some embodiments, one of the fixing portion 111 and the connecting portion 122 is provided with a slot 1112, and the other of the fixing portion 111 and the connecting portion 122 is provided with an inserting section 1223; one of the positioning groove 141 and the positioning protrusion 142 is provided on the side wall of the slot 1112, and the other of the positioning groove 141 and the positioning protrusion 142 is provided on the outer peripheral wall of the inserting section 1223. This embodiment is an embodiment in which the positioning groove 141 and the positioning protrusion 142 are not provided on the end surfaces of the fixing portion 111 and the connecting portion 122.

[0086] It can be understood that the fixing portion 111 is provided with a slot 1112, the connecting portion 122 is provided with an inserting section 1223, the positioning groove 141 is provided on the side wall of the slot 1112, and the positioning protrusion 142 is provided on the outer peripheral wall of the inserting section 1223; or the fixing portion 111 is provided with a slot 1112, the connecting portion 122 is provided with an inserting section 1223, the positioning protrusion 142 is provided on the side wall of the slot 1112, and the positioning groove 141 is provided on the outer peripheral wall of the inserting section 1223 ; Or, the fixing part 111 is provided with an inserting section 1223, the connecting part 122 is provided with a slot 1112, the positioning groove 141 is provided on the side wall of the slot 1112, and the positioning protrusion 142 is provided on the outer peripheral wall of the inserting section 1223; Or, the fixing part 111 is provided with an inserting section 1223, the connecting part 122 is provided with a slot 1112, the positioning protrusion 142 is provided on the side wall of the slot 1112, and the positioning groove 141 is provided on the outer peripheral wall of the inserting section 1223.

[0087] By adopting the above technical solution, while the positioning groove 141 and the positioning protrusion 142 are positioned and matched to achieve anti-rotation, the slot 1112 and the plug-in section 1223 can also be matched at the radial upper limit of the multi-mode resonator 12 to prevent the multi-mode resonator 12 from moving relative to the cavity 11 along its radial direction.

[0088] In some embodiments, the multimode dielectric filter 10 further includes a fastening screw 15, and the connecting portion 122 is fixed to the fixing portion 111 by the fastening screw 15. After the connecting portion 122 and the fixing portion 111 are positioned by the positioning groove 141 and the positioning protrusion 142, the connecting portion 122 is fixed to the fixing portion 111 by the fastening screw 15.

[0089] For details, please also refer to Figure 2 , Figure 4 and Figure 6 A center hole 1212 is provided on the dielectric resonator 121, a threaded hole 1111 is provided on the fixing portion 111, and a through hole 1222 is provided on the connecting portion 122; when fixing, the fastening screw 15 enters from the center hole 1212, passes through the through hole 1222 and is screwed into the threaded hole 1111 to fix the connecting portion 122 on the fixing portion 111.

[0090] Optionally, the positioning protrusion 142 is provided on the fixing portion 111 and arranged around the threaded hole 1111 , and the positioning groove 141 is provided on the connecting portion 122 and arranged around the through hole 1222 .

[0091] The connecting portion 122 is fixed to the fixing portion 111 by means of the fastening screws 15, so that the assembly and disassembly are relatively convenient. Moreover, since the connecting portion 122 and the fixing portion 111 are positioned by means of the plug-in positioning structure 14 (i.e., the positioning groove 141 and the positioning protrusion 142), the connecting portion 122 will not be twisted when the fastening screws 15 are screwed, and even if the connecting portion 122 and the dielectric resonator 121 are fixedly connected by means of bonding, the connecting portion 122 and the dielectric resonator 121 will not be separated.

[0092] The connecting portion 122 and the fixing portion 111 may also be fixedly connected without using the fastening screws 15. In other embodiments, the connecting portion 122 and the fixing portion 111 may also be fixedly connected by plug-in, interference fit, crimping, bonding, welding, threaded connection, etc.

[0093] Optionally, the positioning groove 141 is configured as a closed groove extending radially along the fixing portion 111 or the connecting portion 122 and closed at both ends, that is, the positioning groove 141 has closed structures at both ends in the radial direction of the fixing portion 111 or the connecting portion 122, and the inner dimension of the positioning groove 141 is equal to or smaller than the outer dimension of the positioning protrusion 142; when the positioning protrusion 142 is plugged into the positioning groove 141, the positioning groove 141 and the positioning protrusion 142 can both prevent the fixing portion 111 and the connecting portion 122 from rotating relative to each other along the circumferential direction of the multi-mode resonator 12 to position the multi-mode resonator 12, and can also simultaneously realize that the connecting portion 122 is plugged and connected to the fixing portion 111 through the positioning groove 141 and the positioning protrusion 142, thereby realizing a fixed connection between the connecting portion 122 and the fixing portion 111. Based on this, the structures or components that need to be additionally provided when the connection portion 122 and the fixing portion 111 are connected by other means can be omitted, for example, the knurled structure provided by crimping between the connection portion 122 and the fixing portion 111, or the adhesive provided by bonding between the connection portion 122 and the fixing portion 111, or the solder provided by welding between the connection portion 122 and the fixing portion 111, or the screws provided by fasteners between the connection portion 122 and the fixing portion 111, or the threaded structure provided by threaded connection between the connection portion 122 and the fixing portion 111, etc. In this way, the structures of the connection portion 122 and the fixing portion 111 are simplified, which is beneficial to the processing of the connection portion 122 and the fixing portion 111, reduces the number of parts, and is beneficial to reducing costs. At the same time, the installation process can be simplified, the installation efficiency of the multi-mode resonator 12 is improved, and the miniaturization and simplification of the multi-mode dielectric filter 10 are facilitated.

[0094] Please refer to Figure 2In some embodiments, a flat bottom groove 1221 is provided on the side of the connecting portion 122 facing away from the fixing portion 111 , and the head of the fastening screw 15 is a flat head, and the head of the fastening screw 15 abuts against the inner bottom wall of the flat bottom groove 1221 .

[0095] It can be understood that in this embodiment, the fastening screw 15 is a flat head screw.

[0096] The flat bottom groove 1221 can be a circular groove, a square groove, etc., as long as its bottom wall is flat.

[0097] The head of the fastening screw 15 is in planar contact with the bottom wall of the flat-bottomed groove 1221. Compared with a countersunk screw, the fastening screw 15 can withstand a greater force, thereby improving the reliability of the fixation.

[0098] In other embodiments, a cone-bottom groove is provided on the connecting portion 122 , that is, the bottom wall of the cone-bottom groove is conical, and the fastening screw 15 is a countersunk screw.

[0099] Please also refer to Figure 5 and Figure 6 In some embodiments, the dielectric resonator 121 is a cylindrical structure, and the dielectric resonator 121 has a central hole 1212 and a plurality of resonance holes 1211 arranged around the central hole 1212 , and the central hole 1212 is for the fastening screw 15 to pass through.

[0100] Optionally, the number of the resonant holes 1211 is four, and the four resonant holes 1211 are evenly spaced around the central hole 1212, that is, the multi-mode resonator 12 is a dual-mode resonator. The dielectric resonator 121 includes a first resonant mode and a second resonant mode arranged orthogonally, the first resonant mode includes one group of two resonant holes 1211 arranged symmetrically, and the second resonant mode includes another group of two resonant holes 1211 arranged symmetrically.

[0101] It can be understood that the distance between the two resonance holes 1211 of the first resonance mode may be greater than, equal to, or less than the distance between the two resonance holes 1211 of the first resonance mode.

[0102] Optionally, both the central hole 1212 and the resonance hole 1211 are through holes extending along the axial direction of the multi-mode resonator 12 ; and both the central hole 1212 and the resonance hole 1211 are circular holes.

[0103] The dielectric resonator 121 is a cylindrical structure with a relatively regular shape, which is conducive to the processing and manufacturing of the dielectric resonator 121 .

[0104] like Figure 1 and Figure 2As shown, in some embodiments, the multimode dielectric filter 10 further includes a cover plate 13, a plurality of fixing screws 16, and a plurality of adjusting screws 131. The cover plate 13 is fixed to the cavity 11 by a plurality of fixing screws 16; the adjusting screws 131 are fixed to the cover plate 13, the adjusting screws 131 are arranged corresponding to the resonance hole 1211 and are located above the resonance hole 1211, and the adjusting screws 131 can be close to or away from the resonance hole 1211 to adjust the resonance frequency.

[0105] The above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. These modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present application, and should all be included in the protection scope of the present application.

Claims

1. A multimode dielectric filter, characterized in that: It comprises a cavity and a multi-mode resonator. A plug-in positioning structure is arranged between the bottom wall of the cavity and the multi-mode resonator. The plug-in positioning structure is used to prevent the multi-mode resonator from rotating relative to the bottom wall of the cavity.

2. The multimode dielectric filter according to claim 1, characterized in that: The plug-in positioning structure comprises a positioning groove and a positioning protrusion, one of the positioning groove and the positioning protrusion is arranged on the bottom wall of the cavity, and the other of the positioning groove and the positioning protrusion is arranged on the multi-mode resonator.

3. The multimode dielectric filter according to claim 2, characterized in that: The positioning grooves and the positioning protrusions are respectively arranged asymmetrically with respect to a center line of the multi-mode resonator.

4. The multimode dielectric filter according to claim 2, characterized in that: The projections of the positioning groove and the positioning protrusion in the axial direction of the multi-mode resonator are both non-circular, and the positioning groove and the positioning protrusion are respectively arranged symmetrically with respect to the center line of the multi-mode resonator.

5. The multimode dielectric filter according to any one of claims 2 to 4, characterized in that: A fixing portion is provided on the bottom wall of the cavity, the multi-mode resonator comprises a dielectric resonator and a connecting portion fixed on the dielectric resonator, one of the positioning groove and the positioning protrusion is provided on the fixing portion, and the other of the positioning groove and the positioning protrusion is provided on the connecting portion.

6. The multimode dielectric filter according to claim 5, characterized in that: One of the positioning groove and the positioning protrusion is provided on an end surface of the fixing portion facing the connecting portion, and the other of the positioning groove and the positioning protrusion is provided on an end surface of the connecting portion facing the fixing portion.

7. The multimode dielectric filter according to claim 5, characterized in that: One of the fixing part and the connecting part is provided with a slot, and the other of the fixing part and the connecting part is provided with an inserting section; one of the positioning groove and the positioning protrusion is provided on the side wall of the slot, and the other of the positioning groove and the positioning protrusion is provided on the outer peripheral wall of the inserting section.

8. The multimode dielectric filter according to claim 5, characterized in that: The multimode dielectric filter further comprises a fastening screw, and the connecting portion is fixed to the fixing portion by the fastening screw.

9. The multimode dielectric filter according to claim 8, characterized in that: A flat bottom groove is provided on one side of the connecting portion facing away from the fixing portion. The head of the fastening screw is a flat head, and the head of the fastening screw abuts against the inner bottom wall of the flat bottom groove.

10. The multimode dielectric filter according to claim 8, characterized in that: The dielectric resonator is a cylindrical structure having a central hole and a plurality of resonance holes arranged around the central hole, and the fastening screw passes through the central hole.

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