Multi-mode resonator and filter

Abstract

This application relates to the field of communications, providing a multimode resonator and filter. The multimode resonator has at least two resonance modes: HE mode and HE mode. The multimode resonator includes a resonator housing, a dielectric resonator, and a coupling structure. The dielectric resonator is disposed within the resonator housing and connected to a first wall of the housing. The two electric field polarization directions of the HE mode are along a first radial direction and a second radial direction, respectively, and the first and second radial directions intersect perpendicularly at the central axis of the dielectric resonator. The coupling structure is disposed at one end of the dielectric resonator and intersects perpendicularly at the central axis of the dielectric resonator. The coupling structure is set at an angle to both the first and second radial directions to achieve HE dual-mode coupling. The multimode resonator can achieve HE dual-mode coupling through a simplified and optimized coupling structure, resulting in better coupling performance. This optimizes the structural design, coupling design, and overall performance of the multimode resonator, and facilitates the simulation design of the multimode resonator.

Description

Technical Field

[0001] This application belongs to the field of communication technology, and in particular relates to a multimode resonator and filter. Background Technology

[0002] In some cases, a multimode resonator has at least two resonance modes: HE mode and HE mode. The two electric field polarization directions of the HE mode include HE... ∥ Electric field polarization direction of the mode, HE ⊥ The electric field polarization direction of the mode, HE ∥ The electric field polarization direction of the mode is perpendicular to HE. ⊥ The electric field polarization direction of the mode. In this case, how to make HE... ∥ Model and HE ⊥ Model coupling has become a problem that needs to be solved in the industry. Summary of the Invention

[0003] This application provides a multimode resonator, aiming to solve the problem of how to make the HE mode resonate when the multimode resonator has at least two resonance modes. ∥ Model and HE ⊥ The problem of mode coupling.

[0004] To achieve the above objectives, the technical solution adopted in the embodiments of this application is as follows:

[0005] In a first aspect, a multimode resonator is provided, the multimode resonator having at least two resonance modes, HE mode and the multimode resonator comprising:

[0006] Resonator housing;

[0007] A dielectric resonator is disposed inside the resonator housing and connected to the first wall of the resonator housing; the two electric field polarization directions of the HE mode are respectively along a first radial direction and a second radial direction, and the first radial direction and the second radial direction intersect perpendicularly at the central axis of the dielectric resonator;

[0008] A coupling structure is disposed on the end side of the dielectric resonator and intersects the central axis of the dielectric resonator perpendicularly. The coupling structure is set at an angle to the first radial direction and at an angle to the second radial direction to enable HE dual-mode coupling.

[0009] In some embodiments, the coupling structure is a rib.

[0010] In some embodiments, the coupling structure is disposed between the dielectric resonator and the first wall.

[0011] In some embodiments, the coupling structure is a metal layer metallized on the end face of the dielectric resonator.

[0012] In some embodiments, the coupling structure forms a 45° angle with the first radial direction and a 45° angle with the second radial direction.

[0013] In some embodiments, the coupling structure is rotated 90° about the central axis of the dielectric resonator to change the coupling polarity between the HE dual modes.

[0014] In some embodiments, the multimode resonator includes a coupling adjustment screw threaded to the resonator housing and disposed in the extension direction of the coupling structure.

[0015] In some embodiments, the dielectric resonator has a first opening structure in the first radial direction and a second opening structure in the second radial direction. The first opening structure includes at least one first opening, and the second opening structure includes at least one second opening. The first opening structure and the second opening structure are non-rotationally symmetric along the central axis of the dielectric resonator, so that the two electric field polarization directions of the HE mode are along the first radial direction and the second radial direction, respectively.

[0016] In some embodiments, when there is one first opening, the distance between the first opening and the central axis of the dielectric resonator along the first radial direction is a first distance; when there are multiple first openings, the distance between the two farthest first openings along the first radial direction is the first distance.

[0017] When there is one second opening, the distance between the second opening and the central axis of the dielectric resonator along the second radial direction is the second distance; when there are multiple second openings, the distance between the two second openings that are furthest apart along the second radial direction is the second distance.

[0018] The first distance is not equal to the second distance.

[0019] In some embodiments, the first opening is formed on the end face of the dielectric resonator and is located between the outer peripheral surface of the dielectric resonator and the central axis of the dielectric resonator.

[0020] And / or, the second opening is formed on the end face of the dielectric resonator and is located between the outer peripheral surface of the dielectric resonator and the central axis of the dielectric resonator.

[0021] In some embodiments, the first opening is a hole structure; and / or, the second opening is a hole structure.

[0022] In some embodiments, the multimode resonator has at least three resonance modes: HE mode and TE mode. The dielectric resonator includes a dielectric body and a dielectric cylinder, with the dielectric cylinder erected on one end of the dielectric body and surrounding the periphery of the dielectric body.

[0023] In some embodiments, the medium body is provided with the medium cylinder on the end side facing the first wall, and the coupling structure is provided between the medium body and the first wall and inside the medium cylinder.

[0024] In some embodiments, the multimode resonator includes a metal disk and an insulating element. The metal disk is connected to a second wall of the resonator housing via the insulating element. The second wall is disposed opposite to the first wall. The metal disk and the dielectric body are disposed opposite to each other along the axial direction of the dielectric body. The distance between the metal disk and the dielectric body is adjustable to adjust the resonant frequency of the TE mode.

[0025] In some embodiments, the multimode resonator includes a ceramic base, which is separately connected between the dielectric resonator and the first wall.

[0026] In some embodiments, the ceramic base is ring-shaped, and the coupling structure is disposed between the dielectric resonator and the first wall, and within the ring of the ceramic base.

[0027] In some embodiments, the multimode resonator includes a first tuning screw, which is threaded to the resonator housing and disposed in the first radial direction;

[0028] And / or, the multimode resonator includes a second tuning screw, which is threaded to the resonator housing and disposed in the second radial direction.

[0029] Secondly, a filter is provided, including the multimode resonator provided in the embodiments of this application.

[0030] The advantages of the multimode resonator provided in this application are as follows:

[0031] The multimode resonator provided in this application embodiment, having at least two resonance modes, HE mode and with the two electric field polarization directions of the HE mode along a first radial direction and a second radial direction respectively, can be coupled through a coupling structure located at the end of the dielectric resonator, angled to both the first and second radial directions. Based on this, the electric field energy of the HE mode with its electric field polarization direction along the first radial direction can be coupled, as can the electric field energy of the HE mode with its electric field polarization direction along the second radial direction, thereby enabling the HE dual modes to couple on the coupling structure. Thus, the multimode resonator can achieve HE dual-mode coupling through a simplified and optimized coupling structure, with better coupling effect, thereby optimizing the structural design, coupling design, and overall performance of the multimode resonator, and facilitating the simulation design of the multimode resonator. Attached Figure Description

[0032] To clearly illustrate the technical solutions in the embodiments of this application, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0033] Figure 1 A three-dimensional schematic diagram of a multimode resonator provided for some embodiments of this application;

[0034] Figure 2 for Figure 1 A partial structural schematic diagram of the provided multimode resonator;

[0035] Figure 3 for Figure 2 A partial structural schematic diagram of the provided multimode resonator;

[0036] Figure 4 for Figure 3 A bottom view of the provided multimode resonator;

[0037] Figure 5 for Figure 1 HE of the provided multimode resonator ∥ Electric field distribution diagram of the model;

[0038] Figure 6 for Figure 1 HE of the provided multimode resonator ⊥ Electric field distribution diagram of the model;

[0039] Figure 7 A bottom view of a multimode resonator provided for other embodiments of this application, wherein, with Figure 4 In contrast, the coupling structure changes the coupling polarity between the HE dual modes by rotating 90° around the central axis of the dielectric resonator;

[0040] Figure 8 The following is a bottom view of a multimode resonator provided in some other embodiments of this application, wherein the multimode resonator includes a coupling adjustment screw that is threaded to the resonator housing and is disposed in the extension direction of the coupling structure;

[0041] Figure 9 for Figure 2 A three-dimensional sectional view of the provided dielectric resonator;

[0042] Figure 10 The following is a perspective view of a dielectric resonator provided in some other embodiments of this application, wherein a first opening and a second opening are formed on the outer peripheral surface of the dielectric resonator and connected to at least one end face of the dielectric resonator;

[0043] Figure 11 The following is a perspective view of a dielectric resonator provided in some other embodiments of this application, wherein the first opening and the second opening are formed on the outer peripheral surface of the dielectric resonator and are disposed between the two end faces of the dielectric resonator;

[0044] Figure 12 for Figure 1 The electric field distribution diagram of the TE mode of the provided multimode resonator;

[0045] Figure 13 for Figure 1 The provided simulation results for the frequency and Q value of the multimode resonator are shown in the figure. Mode 1 represents HE. ∥ Mode 2 represents HE ⊥ Mode 3 represents the TE mode, while Mode 4, Mode 5, and Mode 6 are modes outside the passband range;

[0046] Figure 14 Schematic diagrams of the filter structure provided in some embodiments of this application;

[0047] Figure 15 for Figure 14 The provided topology diagram of the filter is shown, where 1-HE ⊥ HE characterizing the first multimode resonator ⊥ Mode, 1-TE characterizes the TE mode of the first multimode resonator, 1-HE ∥ HE characterizing the first multimode resonator ∥ Mold, 2-HE ⊥ HE characterizing the second multimode resonator ⊥ The TE mode of the second multimode resonator is represented by 2-TE, and the HE mode by 2-HE is represented by 2-HE. ∥ HE characterizing the second multimode resonator ∥ mold;

[0048] Figure 16 for Figure 14 The provided simulation waveform diagram of the filter.

[0049] The following are the labeling elements in the figure:

[0050] 1-Multimode resonator, 2-Coupled window, 3-Metal flybar;

[0051] 10-Resonator housing, 11-First wall, 12-Second wall, 13-Side wall; 20-Dielectric resonator, 21-First opening structure, 211-First opening, 22-Second opening structure, 221-Second opening, 23-Dielectric body, 24-Dielectric cylinder; 30-Coupling structure; 40-Metal disk, 50-Ceramic base, 60-First tuning screw, 70-Second tuning screw, 80-Coupling adjustment screw; x-First radial direction, y-Second radial direction, L-Central axis of dielectric resonator, d1-First distance, d2-Second distance. Detailed Implementation

[0052] To make the technical problems, technical solutions, and beneficial effects to be solved by this application clear, the application will be described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of this application and are not intended to limit this application. Unless otherwise specified, all embodiments and optional embodiments of this application can be combined to form new technical solutions. Unless otherwise specified, all technical features and optional technical features of this application can be combined to form new technical solutions.

[0053] In the description of this application, it should be understood that the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.

[0054] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, "multiple" means two or more, unless otherwise explicitly specified.

[0055] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0056] In this application, "central axis" refers to a line that passes through the geometric center of the corresponding structure.

[0057] In this application, "axial" refers to the direction of extension of the central axis of the corresponding structure, "radial" refers to any direction of the corresponding structure that passes through and is perpendicular to the central axis, and "circumferential" refers to the direction of circumference of the outer circumference of the corresponding structure.

[0058] A multimode resonator is a resonator capable of simultaneously generating multiple stable oscillation signals at various frequencies. Multimode resonators can be two-mode, three-mode, four-mode, etc. Within their passband, multimode resonators support multiple resonance modes. These modes can include HE (Hybrid Electromagnetic Mode), TE (Transverse Electric Field) mode, TM (Transverse Magnetic Field) mode, TEM (Transverse Electric and Magnetic Field) mode, and so on. For example, a HE two-mode resonator supports two HE modes within its passband; a HE-TE three-mode resonator supports both HE and TE modes; a HE-TM three-mode resonator supports both HE and TM modes; and a HE-TE-TM four-mode resonator supports all four modes (HE, TE, and TM) within its passband.

[0059] In some cases, a multimode resonator has at least two resonance modes: HE mode and HE mode. The two electric field polarization directions of the HE mode include HE... ∥ Electric field polarization direction of the mode, HE ⊥ The electric field polarization direction of the mode, HE ∥ The electric field polarization direction of the mode is perpendicular to HE. ⊥ The electric field polarization direction of the mode. In this case, how to make HE... ∥ Model and HE ⊥ Model coupling has become a problem that needs to be solved in the industry.

[0060] The embodiments provided in this application will solve the above problems.

[0061] The specific implementation of this application will be described in detail below with reference to specific embodiments:

[0062] Please see Figure 1 , Figure 2 , Figure 3 , Figure 4 Some embodiments of this application provide a multimode resonator 1, which has at least two resonance modes: HE mode and HE mode. The multimode resonator 1 includes a resonator housing 10, a dielectric resonator 20, and a coupling structure 30. The dielectric resonator 20 is disposed inside the resonator housing 10 and connected to the first wall 11 of the resonator housing 10. The two electric field polarization directions of the HE mode are respectively along a first radial direction x and a second radial direction y, which intersect perpendicularly at the central axis L of the dielectric resonator 20. The coupling structure 30 is disposed on the end side of the dielectric resonator 20 and intersects perpendicularly with the central axis L of the dielectric resonator 20. The coupling structure 30 is set at an angle to the first radial direction x and at an angle to the second radial direction y, so as to enable HE dual-mode coupling.

[0063] It should be noted that the multimode resonator 1 has at least two resonance modes, HE mode and HE mode. That is, the multimode resonator 1 can support at least HE mode within its passband. For example, the multimode resonator 1 can be an HE dual-mode resonator, an HE-TE tri-mode resonator, an HE-TM tri-mode resonator, an HE-TE-TM quad-mode resonator, etc.

[0064] It should also be noted that the multimode resonator 1 includes a resonator housing 10 and a dielectric resonator 20. The resonator housing 10 has a resonant cavity inside, which can be, but is not limited to, a rectangular resonant cavity, a square resonant cavity, a polygonal cylindrical resonant cavity, a cylindrical resonant cavity, etc. The dielectric resonator 20 can be accommodated within the resonant cavity. Optionally, the dielectric resonator 20 can be centrally arranged within the resonant cavity. The resonator housing 10 can provide shielding to prevent signal leakage.

[0065] One of the walls of the resonator housing 10 is the first wall 11. In practical applications, the first wall 11 of the resonator housing 10 can be the wall located on the lower side, or it can be any wall located on the upper side, left side, right side, front side, or rear side. In addition, the shape, size, material, etc. of the resonator housing 10 can be flexibly set as needed.

[0066] The dielectric resonator 20 is a resonator made of dielectric material. The dielectric resonator 20 can be a ceramic dielectric resonator or a dielectric resonator made of other materials. One end of the dielectric resonator 20 along its axial direction is connected to the first wall 11. The dielectric resonator 20 can be directly connected and fixed to the first wall 11 by, but not limited to, welding, bonding, riveting, pressing, plugging, screw fastening, threaded connection, snap-fitting, etc., or it can be indirectly connected and fixed to the first wall 11 by other structures connected to it (such as ceramic base 50, base platform, coupling rib, etc.). The dielectric resonator 20 can be, but not limited to, columnar, block, rod-shaped, etc. The cross-sectional shape of the dielectric resonator 20 perpendicular to its axial direction can be, but not limited to, circular, rectangular, square, polygonal, petal-shaped, cross-shaped, etc. The cross-sectional shape of the dielectric resonator 20 parallel to its axial direction can also be, but not limited to, circular, rectangular, square, polygonal, petal-shaped, cross-shaped, etc. A central hole can be provided at the central axis L of the dielectric resonator 20, or it can be without a central hole.

[0067] It should also be noted that the dielectric resonator 20 has two end faces along its own axial direction, and the outer peripheral surface of the dielectric resonator 20 refers to the peripheral surface connected to the two end faces of the dielectric resonator 20. The first radial x and the second radial y are the two radial directions of the dielectric resonator 20, which intersect perpendicularly, and both the first radial x and the second radial y intersect perpendicularly with the central axis L of the dielectric resonator 20.

[0068] The two electric field polarization directions of the HE mode are along the first radial direction x and the second radial direction y, respectively. For example, HE... ∥ The electric field polarization direction of the mode is along the first radial x (e.g., Figure 5 shown), HE ⊥ The electric field polarization direction of the mode is along the second radial direction y (e.g., Figure 6 shown), HE ∥ Electric field polarization direction of the mode, HE ⊥ The electric field polarization direction of the mode is the same as the two electric field polarization directions of the HE mode.

[0069] The coupling structure 30 is disposed on the end side of the dielectric resonator 20, that is, the coupling structure 30 can be disposed on the end side of the dielectric resonator 20 facing the first wall 11, or on the end side of the dielectric resonator 20 facing away from the first wall 11. The coupling structure 30 intersects perpendicularly with the central axis L of the dielectric resonator 20, such that the coupling structure 30 is parallel to the plane jointly defined by the first radial direction x and the second radial direction y. The coupling structure 30 can be arranged in a straight line (e.g., ...). Figure 3 , Figure 4 (As shown), it can also be extended by curves or by bends.

[0070] The coupling structure 30 is set at an angle to the first radial direction x and at an angle to the second radial direction y. Therefore, the coupling structure 30 can couple HE modes (e.g., HE) with the electric field polarization direction along the first radial direction x. ∥ The electric field energy of the mode can be coupled to the HE mode (e.g., HE mode) whose electric field polarization direction is along the second radial direction y. ⊥ The electric field energy of the HE dual-mode (e.g., HE mode) can be used to enable the HE dual-mode (e.g., HE mode) to achieve the desired electric field energy. ∥ Model and HE ⊥ The modes are coupled to each other. That is, HE dual-mode (e.g., HE) ∥ Model and HE ⊥ The module can be coupled to the coupling structure 30.

[0071] The coupling strength and coupling effect between the coupling structure 30 and the HE dual-mode can be adjusted by changing the dimensions of the coupling structure 30. The dimensions of the coupling structure 30 include its length, width, and height. The length of the coupling structure 30 is its radial dimension along the dielectric resonator 20; the height of the coupling structure 30 is its axial dimension along the dielectric resonator 20; and the width of the coupling structure 30 is its dimension in the direction perpendicular to its length and height directions. The larger the dimensions of the coupling structure 30 (i.e., the larger any one of its length, width, and height), the stronger the coupling strength and the better the coupling effect between the coupling structure 30 and the HE dual-mode.

[0072] In the case where the coupling structure 30 is located on the end side of the dielectric resonator 20 facing the first wall 11, the coupling structure 30 can abut against the end face of the dielectric resonator 20 facing the first wall 11, or it can abut against the first wall 11, or it can be spaced between the end face of the dielectric resonator 20 facing the first wall 11 and the first wall 11. In the case where the coupling structure 30 is located on the end side of the dielectric resonator 20 facing away from the first wall 11, the coupling structure 30 can abut against the end face of the dielectric resonator 20 facing away from the first wall 11, or it can abut against the second wall 12 of the resonator housing 10 opposite to the first wall 11, or it can be spaced between the end face of the dielectric resonator 20 facing away from the first wall 11 and the second wall 12. Based on this, the coupling strength and coupling effect between the coupling structure 30 and the HE dual-mode can be adjusted by adjusting the "distance between the coupling structure 30 and the dielectric resonator 20 along the axial direction of the dielectric resonator 20". Specifically, the smaller the distance between the coupling structure 30 and the dielectric resonator 20 along the axial direction of the dielectric resonator 20, the stronger the coupling strength and the better the coupling effect between the coupling structure 30 and the HE dual-mode. Therefore, when the coupling structure 30 abuts against the end face of the dielectric resonator 20, the coupling strength between the coupling structure 30 and the HE dual-mode is relatively strong and the coupling effect is relatively good.

[0073] Since the first radial direction x and the second radial direction y form a 90° angle, the sum of the angle between the coupling structure 30 and the first radial direction x and the angle between the coupling structure 30 and the second radial direction y is 90°. Based on this, the coupling strength and coupling effect between the coupling structure 30 and the HE dual-mode can be adjusted by adjusting the angle between the coupling structure 30 and the first radial direction x and the angle between the coupling structure 30 and the second radial direction y. Specifically, if the angle between the coupling structure 30 and the first radial direction x is less than the angle between the coupling structure 30 and the second radial direction y, then the coupling structure 30 and the HE mode (e.g., HE mode with electric field polarization direction along the first radial direction x) will be stronger. ∥ The coupling strength and coupling effect of the coupling structure 30 with the HE mode (e.g., HE mode) along the second radial direction y are better than those of the coupling structure 30 with the electric field polarization direction. ⊥ The coupling strength and coupling effect of the coupling structure 30 (e.g., HE mode) along the electric field polarization direction along the first radial x. If the angle between the coupling structure 30 and the first radial x is greater than the angle between the coupling structure 30 and the second radial y, then the coupling structure 30 and the HE mode (e.g., HE mode) along the electric field polarization direction along the first radial x are considered to be "coupling strength and coupling effect". ∥ The coupling strength and coupling effect of the coupling structure 30 with the HE mode (e.g., HE mode) along the second radial direction y are inferior to those of the coupling structure 30 with the electric field polarization direction. ⊥ The coupling strength and coupling effect of the coupling structure 30 (e.g., HE mode) along the electric field polarization direction along the first radial x. If the angle between the coupling structure 30 and the first radial x is equal to the angle between the coupling structure 30 and the second radial y, then the coupling strength and coupling effect of the coupling structure 30 and the HE mode (e.g., HE mode) along the first radial x are equal. ∥ The coupling strength and coupling effect of the coupling structure 30 are balanced with the coupling structure 30 and the HE mode (e.g., HE mode) whose electric field polarization direction is along the second radial direction y. ⊥ The coupling strength and coupling effect of the coupling structure 30 with the first radial direction x. That is, the smaller the angle between the coupling structure 30 and the first radial direction x, the stronger the coupling strength and coupling effect of the coupling structure 30 with the HE mode (e.g., HE mode) whose electric field polarization direction is along the first radial direction x. ∥ The stronger the coupling strength of the coupling structure 30, the better the coupling effect. The smaller the angle between the coupling structure 30 and the second radial direction y, the better the coupling effect between the coupling structure 30 and the HE mode (e.g., HE mode) whose electric field polarization direction is along the second radial direction y. ⊥ The stronger the coupling strength of the modules, the better the coupling effect.

[0074] In this configuration, one end of the coupling structure 30 can be located at the central axis L of the dielectric resonator 20, while the other end is spaced apart from the central axis L of the dielectric resonator 20, such that the entire coupling structure 30 is located on one side of the central axis L of the dielectric resonator 20. Alternatively, the two ends of the coupling structure 30 can be located on opposite sides of the central axis L of the dielectric resonator 20. In this case, the midpoint of the coupling structure 30 can coincide with or be spaced apart from the central axis L of the dielectric resonator 20. Figure 3 , Figure 4 As shown, in some embodiments, the coupling structure 30 is symmetrically arranged about the central axis L of the dielectric resonator 20, that is, the two parts of the coupling structure 30 located on both sides of the central axis of the dielectric resonator 20 are symmetrically arranged, and the midpoint of the coupling structure 30 is located at the central axis L of the dielectric resonator 20.

[0075] The coupling structure 30 can be made of a metallic material, or it can be made by covering the surface of the insulating structure with a metallic material. The metallic material used for the coupling structure 30 can be, but is not limited to, silver, copper, gold, nickel, alloys, etc.

[0076] The coupling structure 30 can be formed independently relative to the dielectric resonator 20 and the resonator housing 10, or it can be integrally connected to the end face of the dielectric resonator 20, or it can be integrally connected to the wall portion (e.g., the first wall 11 or the second wall 12) of the resonator housing 10. The coupling structure 30 can be grounded to the wall portion (e.g., the first wall 11 or the second wall 12) of the resonator housing 10, or it can be ungrounded.

[0077] In summary, the multimode resonator 1 provided in this application embodiment, having at least two resonance modes, HE mode and the two electric field polarization directions of HE mode being along the first radial x and the second radial y respectively, can be coupled via a coupling structure 30 located at the end of the dielectric resonator 20, which is angled to the first radial x and angled to the second radial y. Based on this, the HE mode (e.g., HE mode with electric field polarization direction along the first radial x) can be coupled via the coupling structure 30. ∥ The electric field energy of the mode, coupled with the electric field polarization direction along the second radial y of the HE mode (e.g., HE). ⊥ The electric field energy of the HE dual-mode (e.g., HE mode) can be used to enable the HE dual-mode (e.g., HE mode) to achieve the desired electric field energy. ∥ Model and HE ⊥ The modes can be coupled to each other on the coupling structure 30. Thus, the multimode resonator 1 can, through the simplified and optimized coupling structure 30, enable HE dual-mode (e.g., HE) coupling. ∥ Model and HE ⊥ The coupling is achieved by the mode, and the coupling effect is better, which can optimize the structural design, coupling design and overall performance of the multimode resonator 1, and facilitate the simulation design of the multimode resonator 1.

[0078] Please see Figure 3 , Figure 4 In some embodiments of this application, the coupling structure 30 is a rib.

[0079] By adopting the above scheme, and by making the coupling structure 30 a rib, it is easy to separately form the coupling structure 30 onto the dielectric resonator 20, and it is also easy to separately form or integrally form the coupling structure 30 onto the wall of the resonator housing 10 (e.g., Figure 2 The first wall 11 shown or Figure 1 The second wall 12 shown facilitates the processing, forming, connection, and fixing of the coupling structure 30, thereby improving the processing convenience, processing efficiency, structural reliability, and structural strength of the coupling structure 30.

[0080] Furthermore, the structural form of the coupling structure 30 can be simplified, allowing it to be rib-like and possessing a regular and well-defined length, width, and height. Based on this, the coupling structure 30 can be easily tilted relative to the first radial x and second radial y axes, respectively. This allows for adjustments to the coupling strength and effect between the coupling structure 30 and the HE dual-mode by modifying the length, width, and height of the coupling structure 30, the spacing between the coupling structure 30 and the dielectric resonator 20 along the axial direction of the dielectric resonator 20, the angle between the coupling structure 30 and the first radial x, and the angle between the coupling structure 30 and the second radial y. This improves the design flexibility and performance of the multimode resonator 1.

[0081] Please see Figure 2 , Figure 3 , Figure 4 In some embodiments of this application, the coupling structure 30 is disposed between the dielectric resonator 20 and the first wall 11.

[0082] When the coupling structure 30 is a rib, it will occupy a certain amount of space. Based on this, by adopting the above solution, by placing the coupling structure 30 between the dielectric resonator 20 and the first wall 11, the end of the dielectric resonator 20 facing away from the first wall 11 can be placed between the second wall 12 of the resonator housing 10, freeing up more space for the installation of the debugging structure (such as the metal disk 40 mentioned below). This optimizes and compacts the structural layout of the multimode resonator 1, improves the design flexibility of the multimode resonator 1, and facilitates the miniaturization of the multimode resonator 1.

[0083] Of course, in other embodiments, the coupling structure 30 may be disposed on the end side of the dielectric resonator 20 facing away from the first wall 11 to the second wall 12 (e.g. Figure 1 (as shown) between.

[0084] Please refer to Figure 4In some embodiments of this application, the coupling structure 30 is a metal layer metallized on the end face of the dielectric resonator 20. That is, the coupling structure 30 is a metal layer, and the coupling structure 30 is directly metallized on the end face of the dielectric resonator 20. The metallization method can be, but is not limited to, electroplating, sputtering coating, chemical vapor deposition (CVD), physical vapor deposition (PVD), laser cladding, metal injection molding (MIM), etc. The metal material used in the coupling structure 30 can be, but is not limited to, silver, copper, gold, nickel, alloys, etc.

[0085] By adopting the above scheme, the coupling structure 30 can be directly metallized on the end face of the dielectric resonator 20. This facilitates the processing and forming of the coupling structure 30, simplifies the assembly process between the coupling structure 30 and the dielectric resonator 20, and improves the processing convenience, efficiency, and accuracy of the coupling structure 30, thereby enhancing the assembly convenience and efficiency of the multimode resonator 1. Furthermore, during the forming of the coupling structure 30, its length, width, and height are precisely and stably determined, as are the angles between the coupling structure 30 and the first radial direction x, and the angles between the coupling structure 30 and the second radial direction y. The coupling structure 30 stably and reliably abuts against the end face of the dielectric resonator 20. This optimizes and stabilizes the coupling strength and coupling effect between the coupling structure 30 and the HE dual-mode, resulting in stronger coupling and better coupling effect, thus optimizing the performance of the multimode resonator 1. Furthermore, the coupling structure 30 can essentially share space with the dielectric resonator 20 without requiring additional space. Therefore, regardless of whether the coupling structure 30 is located on the end of the dielectric resonator 20 facing the first wall 11 or on the end of the dielectric resonator 20 facing away from the first wall 11, sufficient space can be provided between the dielectric resonator 20 and the resonator housing 10 for arranging the debugging structure (e.g., Figure 2 The metal disk 40 shown can be used to optimize and compact the structural layout of the multimode resonator 1, which is beneficial for the miniaturization of the multimode resonator 1.

[0086] In other embodiments, the coupling structure 30 may also be a metal sheet, which may be fixed to the end face of the dielectric resonator 20 by means of bonding, welding, fastener connection, etc.; the metal sheet may also be fixed to the first wall 11 or the second wall 12 at intervals by a support member. In this case, the metal sheet may abut against the end face of the dielectric resonator 20, or the metal sheet may be spaced between the end face of the dielectric resonator 20 and the first wall 11 (or the second wall 12).

[0087] Please see Figure 3 , Figure 4 In some embodiments of this application, the coupling structure 30 forms a 45° angle with the first radial x and a 45° angle with the second radial y.

[0088] By adopting the above scheme, the angle between the coupling structure 30 and the first radial direction x can be made equal to the angle between the coupling structure 30 and the second radial direction y, both being 45°. Based on this, the HE mode (e.g., HE) along the electric field polarization direction of the coupling structure 30 and the first radial direction x can be made equal to the angle between the coupling structure 30 and the second radial direction y. ∥ The coupling strength and coupling effect of the coupling structure 30 are balanced with the coupling structure 30 and the HE mode (e.g., HE mode) whose electric field polarization direction is along the second radial direction y. ⊥ The coupling strength and coupling effect of the coupling structure 30 and HE dual mode can be optimized, thereby optimizing the coupling design and overall performance of the multimode resonator 1.

[0089] Of course, in other embodiments, the sum of the angle between the coupling structure 30 and the first radial x and the angle between the coupling structure 30 and the second radial y is 90°, and the angle between the coupling structure 30 and the first radial x and the angle between the coupling structure 30 and the second radial y are set differently.

[0090] Please see Figure 4 , Figure 7 In some embodiments of this application, the coupling structure 30 is rotated 90° around the central axis L of the dielectric resonator 20 to change the coupling polarity between the HE dual modes.

[0091] It should be noted that, with Figure 4 Compared to the coupling structure 30 shown, Figure 7 The coupling structure 30 shown is rotated 90° around the central axis L of the dielectric resonator 20, reversing its orientation and the direction of the current obtained by the coupling electric field energy through the coupling structure 30. This reverses the coupling polarity achieved by the coupling structure 30, specifically, the coupling polarity between the HE dual modes. This polarity reversal is the reversal of the positive and negative signs of the coupling coefficient between the HE dual modes, i.e., the reversal of positive and negative coupling.

[0092] By adopting the above scheme, the coupling structure 30 can be rotated 90° around the central axis L of the dielectric resonator 20 to reverse the direction of the current obtained by the coupling electric field energy of the coupling structure 30, thereby reversing the coupling polarity between the HE dual modes between positive and negative coupling. This facilitates the on-demand change of the coupling polarity between the HE dual modes, simplifying the coupling design and simulation design of the multimode resonator 1, and improving the design flexibility and performance of the multimode resonator 1.

[0093] Please see Figure 1 , Figure 8In some embodiments of this application, the multimode resonator 1 includes a coupling adjustment screw 80, which is threadedly connected to the resonator housing 10 and disposed in the extension direction of the coupling structure 30.

[0094] It should be noted that the coupling adjustment screw 80, located in the extension direction of the coupling structure 30, is used to adjust the coupling strength and coupling effect between the coupling structure 30 and the HE dual-mode. That is, the coupling adjustment screw 80 is used to adjust the HE dual-mode (e.g., HE...) ∥ Model and HE ⊥ The coupling amount between the two modes. Based on this, the coupling strength and coupling effect between the coupling structure 30 and the HE dual mode can be adjusted not only by "adjusting the size of the coupling structure 30", "adjusting the distance between the coupling structure 30 and the dielectric resonator 20 along the axial direction of the dielectric resonator 20", "adjusting the angle between the coupling structure 30 and the first radial x", and "adjusting the angle between the coupling structure 30 and the second radial y", but also by setting a coupling adjustment screw 80 in the extension direction of the coupling structure 30.

[0095] The number of coupling adjustment screws 80 can be one or more. The coupling adjustment screw 80 can be threadedly connected to any wall portion of the resonator housing 10 (e.g., the first wall 11, the second wall 12 opposite to the first wall 11, or the side wall 13 connecting the first wall 11 and the second wall 12). The coupling adjustment screw 80 can be directly threadedly connected to a threaded hole in the corresponding wall portion; alternatively, a fitting (not shown in the figure) can be embedded in the corresponding wall portion, and the coupling adjustment screw 80 can be threadedly connected to the threaded hole of the fitting. The coupling adjustment screw 80 can be grounded based on its conductive connection to the resonator housing 10; or it can be ungrounded based on its insulated connection to the resonator housing 10.

[0096] Based on the fact that the coupling adjustment screw 80 is located in the extending direction of the coupling structure 30, the specific position of the coupling adjustment screw 80 relative to the dielectric resonator 20 can be flexibly set. In some embodiments, the coupling adjustment screw 80 may be located on the periphery of the dielectric resonator 20 along the extending direction of the coupling structure 30; in this case, when there are multiple coupling adjustment screws 80, the multiple coupling adjustment screws 80 may be located only on the same side of the dielectric resonator 20 along the extending direction of the coupling structure 30, or they may be located on opposite sides of the dielectric resonator 20 along the extending direction of the coupling structure 30. In other embodiments, the coupling adjustment screw 80 may be correspondingly arranged with the dielectric resonator 20 along the axial direction of the dielectric resonator 20; in this case, the coupling adjustment screw 80 may be spaced apart from the dielectric resonator 20 along the axial direction of the dielectric resonator 20, and the coupling adjustment screw 80 may also extend into the dielectric resonator 20 (in this case, the dielectric resonator 20 should have a clearance hole for the coupling adjustment screw 80 to extend into).

[0097] By adopting the above scheme, the length of the portion of the coupling adjusting screw 80 extending into the resonator housing 10 can be conveniently and quickly adjusted by screwing it in or out. Based on this, the length of the portion of the coupling adjusting screw 80 extending into the resonator housing 10 can be adjusted to control the HE dual-mode (e.g., HE) signal. ∥ Model and HE ⊥ The coupling amount between the two modes is convenient, quick, and precise. Especially after the coupling structure 30 has been formed or installed in the multimode resonator 1, the values ​​of "the dimensions of the coupling structure 30," "the distance between the coupling structure 30 and the dielectric resonator 20 along the axial direction of the dielectric resonator 20," "the angle between the coupling structure 30 and the first radial x," and "the angle between the coupling structure 30 and the second radial y" are fixed or inconvenient to change. The coupling adjustment screw 80 can be used to adjust the coupling between the HE dual modes (e.g., HE...). ∥ Model and HE ⊥ The coupling amount between modes is reduced, thereby ensuring the stable performance of the multimode resonator 1 and facilitating the optimization of the multimode resonator 1's specifications and parameters.

[0098] The longer the length of the coupling adjustment screw 80 extending into the resonator housing 10, the greater the coupling between the HE dual modes; conversely, the shorter the length of the coupling adjustment screw 80 extending into the resonator housing 10, the smaller the coupling between the HE dual modes.

[0099] In some cases, multimode resonators can be made by cutting a slot in each of the four radial directions (45°, 135°, 225°, and 315°) of the dielectric cylinder, with each slot having the same depth and length, so that HE ∥ The electric field polarization direction of the mode is along the 0° radial direction, and makes HE ⊥ The electric field polarization direction of the mode is along a 90° radial direction. This is theoretically feasible, but in actual products, due to processing errors and the difficulty in precisely controlling processing accuracy, HE... ∥ Model, HE ⊥ The electric field polarization direction of the mode will deviate from the preset direction, causing the coupling strength and coupling effect achieved by the coupling structure used to couple the HE dual modes to also deviate from the expected direction.

[0100] To resolve this issue, please refer to Figure 2 , Figure 3 , Figure 4In some embodiments of this application, the dielectric resonator 20 is provided with a first opening structure 21 in the first radial x and a second opening structure 22 in the second radial y. The first opening structure 21 includes at least one first opening 211, and the second opening structure 22 includes at least one second opening 221. The first opening structure 21 and the second opening structure 22 are non-rotationally symmetric along the central axis L of the dielectric resonator 20, so that the two electric field polarization directions of the HE mode are respectively along the first radial x and the second radial y.

[0101] It should be noted that the dielectric resonator 20 has a first opening structure 21 on the first radial direction x, and in particular, the first opening structure 21 is located on the first longitudinal section of the dielectric resonator 20, which is a plane jointly defined by the first radial direction x and the central axis L of the dielectric resonator 20. The first opening structure 21 includes at least one first opening 211. When there are multiple first openings 211, the multiple first openings 211 are arranged at intervals along the first radial direction x. The multiple first openings 211 can be arranged at equal intervals or at unequal intervals; the multiple first openings 211 can be uniformly located on one side of the central axis L of the dielectric resonator 20, or they can be distributed on both sides of the central axis L of the dielectric resonator 20; the multiple first openings 211 can be symmetrically distributed about the central axis L of the dielectric resonator 20 or asymmetrically distributed. The first opening 211 can be a hole structure, such as a through hole or a blind hole, such as a circular hole, a rectangular hole, an oblong hole, an irregular hole, etc.; the first opening 211 can also be a groove structure, such as a straight groove, a curved groove, an arc groove, etc. The first opening 211 can be opened on any end face of the dielectric resonator 20 along its own axial direction, or it can be opened on the outer peripheral surface of the dielectric resonator 20.

[0102] The dielectric resonator 20 has a second opening structure 22 on the second radial direction y, and more particularly, the second opening structure 22 is located on the second longitudinal section of the dielectric resonator 20, which is a plane jointly defined by the second radial direction y and the central axis L of the dielectric resonator 20. The second opening structure 22 includes at least one second opening 221. When there are multiple second openings 221, the multiple second openings 221 are arranged at intervals along the second radial direction y, wherein the multiple second openings 221 can be arranged at equal intervals or at unequal intervals; the multiple second openings 221 can be uniformly located on one side of the central axis L of the dielectric resonator 20, or they can be distributed on both sides of the central axis L of the dielectric resonator 20; the multiple second openings 221 can be symmetrically distributed about the central axis L of the dielectric resonator 20 or asymmetrically distributed. The second opening 221 can be a hole structure, such as a through hole or a blind hole, such as a circular hole, a rectangular hole, an oblong hole, an irregular hole, etc.; the second opening 221 can also be a groove structure, such as a straight groove, a curved groove, an arc groove, etc. The second opening 221 can be opened on any end face of the dielectric resonator 20 along its own axial direction, or it can be opened on the outer peripheral surface of the dielectric resonator 20.

[0103] The first opening structure 21 and the second opening structure 22 are non-rotationally symmetric along the central axis L of the dielectric resonator 20. That is, when the first opening structure 21 rotates around the central axis L of the dielectric resonator 20 to the second radial direction y, it cannot completely coincide with the second opening structure 22, and when the second opening structure 22 rotates around the central axis L of the dielectric resonator 20 to the first radial direction x, it cannot completely coincide with the first opening structure 21. There are various ways to achieve the "non-rotationally symmetric structure of the first opening structure 21 and the second opening structure 22 along the central axis L of the dielectric resonator 20". For example, the number of first openings 211 and the number of second openings 221 can be different; the shapes of the first openings 211 and the second openings 221 can be different; the sizes of the first openings 211 and the second openings 221 can be different; the distance from the first opening 211 to the central axis L of the dielectric resonator 20 can be different from the distance from the second opening 221 to the central axis L of the dielectric resonator 20, and so on.

[0104] Since the first opening structure 21 and the second opening structure 22 are non-rotationally symmetric along the central axis L of the dielectric resonator 20, they disrupt the rotational symmetry of the dielectric resonator 20, giving it unique characteristics in the first radial direction x and the second radial direction y. Based on this, the first opening structure 21 and the second opening structure 22 can create specific "perturbations" and "guidance" on the electric field of the HE mode, causing the electric field distribution of the HE mode to be non-uniform. This allows the two electric field polarization directions of the HE mode to be along the first radial direction x and the second radial direction y, respectively. Specifically, the first opening structure 21 can cause one electric field polarization direction of the HE mode to be along the first radial direction x, and the second opening structure 22 can cause the other electric field polarization direction of the HE mode to be along the second radial direction y. For example, the first opening structure 21 can cause the HE mode to... ∥ The electric field polarization direction of the mode is along the first radial x (e.g., Figure 5 As shown), the second opening structure 22 can facilitate HE ⊥ The electric field polarization direction of the mode is along the second radial direction y (e.g., Figure 6 shown), HE ∥ Electric field polarization direction of the mode, HE ⊥ The electric field polarization direction of the mode is the same as the two electric field polarization directions of the HE mode.

[0105] It should also be noted that the first opening structure 21 can hollow out the area of ​​the dielectric resonator 20 corresponding to the first opening structure 21, reducing or even eliminating the thickness of the portion of the dielectric resonator 20 along its axial and radial directions corresponding to the first opening structure 21. This allows the electric field path of the HE mode to pass directly through the first opening structure 21, thus shortening the electric field path of the HE mode. Therefore, the first opening structure 21 not only has the function of "precisely guiding and controlling one electric field polarization direction of the HE mode along the first radial x", but also has the function of "increasing the resonant frequency of the TE mode" and "increasing the resonant frequency of the HE mode". Specifically, the more first openings 211 there are, the higher the resonant frequency of the TE mode and the higher the resonant frequency of the HE mode; the larger the size of the first opening 211 (e.g., the deeper, the wider, or the longer the extension length, etc.), the higher the resonant frequency of the TE mode and the higher the resonant frequency of the HE mode; the closer the position of the first opening 211 is to the central axis L of the dielectric resonator 20, the lower the resonant frequency of the TE mode and the higher the resonant frequency of the HE mode; and so on.

[0106] Similarly, the second opening structure 22 can hollow out the region of the dielectric resonator 20 corresponding to the second opening structure 22, reducing or even eliminating the thickness of the portion of the dielectric resonator 20 along its axial and radial directions corresponding to the second opening structure 22. This allows the electric field path of the HE mode to pass directly through the second opening structure 22, shortening the HE mode's electric field path. Therefore, the second opening structure 22 not only has the function of "precisely guiding and controlling the other electric field polarization direction of the HE mode along the second radial direction y," but also has the function of "increasing the resonant frequency of the TE mode" and "increasing the resonant frequency of the HE mode." Specifically, the more second openings 221 there are, the higher the resonant frequency of both the TE and HE modes; the larger the size of the second opening 221 (e.g., the deeper, wider, or longer the extension), the higher the resonant frequency of both the TE and HE modes; the closer the position of the second opening 221 is to the central axis L of the dielectric resonator 20, the lower the resonant frequency of the TE mode and the higher the resonant frequency of the HE mode; and so on.

[0107] By adopting the above scheme, a first opening structure 21 can be provided on the first radial direction x of the dielectric resonator 20, and a second opening structure 22 can be provided on the second radial direction y of the dielectric resonator 20. The first opening structure 21 and the second opening structure 22 are arranged in a non-rotationally symmetric structure along the central axis L of the dielectric resonator 20. This allows the first opening structure 21 and the second opening structure 22 to disrupt the rotational symmetry of the dielectric resonator 20, thus enabling the dielectric resonator 20 to have unique characteristics in the first radial direction x and the second radial direction y, respectively. Based on this, the first opening structure 21 and the second opening structure 22 can create specific "perturbations" and "guidance" on the electric field of the HE mode, thereby causing the two electric field polarization directions of the HE mode to be along the first radial direction x and the second radial direction y, respectively. Furthermore, since the first opening structure 21 and the second opening structure 22 are designed differently (i.e., set differently), the processing of the first opening structure 21 and the second opening structure 22 can accommodate certain processing errors. The processing errors and processing accuracy do not significantly affect the formation of differences and non-rotationally symmetric structures between the first opening structure 21 and the second opening structure 22. Therefore, the requirements for processing errors and processing accuracy of the first opening structure 21 and the second opening structure 22 can be reduced. It is convenient to accurately guide and control one electric field polarization direction of the HE mode along the first radial x through the first opening structure 21, and to accurately guide and control the other electric field polarization direction of the HE mode along the second radial y through the second opening structure 22. Thus, it is possible to accurately guide and control the two electric field polarization directions of the HE mode along the preset direction. It is convenient to design the coupling structure 30 based on the accurately determined and unbiased first radial x and second radial y. It can make the coupling strength and coupling effect achieved by the coupling structure 30 meet the expectations. It can facilitate the coupling design and simulation design of the multimode resonator 1, and improve the processing convenience, design flexibility, consistency and stability of the multimode resonator 1.

[0108] Furthermore, based on the first opening structure 21 and the second opening structure 22, the resonant frequency of the TE mode and the resonant frequency of the HE mode can be easily adjusted. Based on this, the multimode resonator 1 can be coupled to the HE mode in a single cavity as needed, or coupled to the HE mode and the TE mode in a single cavity as needed, thereby improving the performance and design flexibility of the multimode resonator 1.

[0109] Please see Figure 3 , Figure 4In some embodiments of this application, when there is one first opening 211, the distance between the first opening 211 and the central axis L of the dielectric resonator 20 along the first radial direction x is a first distance d1; when there are multiple first openings 211, the distance between the two farthest first openings 211 along the first radial direction x is the first distance d1. When there is one second opening 221, the distance between the second opening 221 and the central axis L of the dielectric resonator 20 along the second radial direction y is a second distance d2; when there are multiple second openings 221, the distance between the two farthest second openings 221 along the second radial direction y is the second distance d2. Wherein, the first distance d1 is not equal to the second distance d2.

[0110] It should be noted that, as Figure 4 As shown, in some embodiments, the first opening structure 21 includes a plurality of first openings 211 spaced apart along a first radial direction x. In this case, the distance (i.e., minimum distance) between the peripheries (e.g., hole edges, slot edges, etc.) of the two farthest first openings 211 along the first radial direction x is a first distance d1. In other embodiments, the first opening structure 21 includes only one first opening 211. In this case, the distance (i.e., minimum distance) from the periphery (e.g., hole edges, slot edges, etc.) of the first opening 211 to the central axis L of the dielectric resonator 20 along the first radial direction x is a first distance d1.

[0111] like Figure 4 As shown, in some embodiments, the second opening structure 22 includes a plurality of second openings 221 spaced apart along a second radial direction y. In this case, the distance (i.e., minimum distance) between the peripheries (e.g., hole edges, slot edges, etc.) of the two second openings 221 that are farthest apart along the second radial direction y is the second distance d2. In other embodiments, the second opening structure 22 includes only one second opening 221. In this case, the distance (i.e., minimum distance) from the periphery (e.g., hole edges, slot edges, etc.) of the second opening 221 to the central axis L of the dielectric resonator 20 along the second radial direction y is the second distance d2.

[0112] The number of second openings 221 can be the same as or different from the number of first openings 211. That is, if there is one first opening 211, there can be one or more second openings 221. If there are multiple first openings 211, there can be one or more second openings 221.

[0113] Wherein, the first distance d1 is not equal to the second distance d2, that is, the first distance d1 can be greater than or less than the second distance d2.

[0114] By adopting the above scheme, a significant difference can be created between the first opening structure 21 and the second opening structure 22 by making the first distance d1 not equal to the second distance d2. This allows for a convenient, quick, and reliable non-rotationally symmetric structure of the first opening structure 21 and the second opening structure 22 along the central axis L of the dielectric resonator 20. Based on this, it is convenient to accurately guide and control one electric field polarization direction of the HE mode along the first radial x via the first opening structure 21, and to accurately guide and control the other electric field polarization direction of the HE mode along the second radial y via the second opening structure 22. This also reduces the requirements for processing errors and processing accuracy, thereby improving the processing convenience, consistency, and stability of the multimode resonator 1. It also facilitates the design of the coupling structure 30 based on the precisely determined and unbiased first radial x and second radial y, ensuring that the coupling strength and coupling effect achieved by the coupling structure 30 meet expectations.

[0115] Furthermore, based on this embodiment, the shape and size of the first opening 211 can be set to be the same as the shape and size of the second opening 221. Based on this, the design of the first opening 211 and the second opening 221 can be unified by precisely controlling the two electric field polarization directions of the HE mode along the preset first radial x and second radial y. This simplifies the structural design of the first opening structure 21 and the second opening structure 22, and improves the processing convenience and efficiency of the first opening structure 21, the second opening structure 22 and the dielectric resonator 20.

[0116] Of course, in other embodiments, this embodiment is also suitable for being combined with situations such as "the number of the first opening 211 and the number of the second opening 221 are different", "the shape of the first opening 211 and the shape of the second opening 221 are different", and "the size of the first opening 211 and the size of the second opening 221 are different" as needed, so as to increase the difference between the first opening structure 21 and the second opening structure 22, and control the two electric field polarization directions of the HE mode along the preset first radial x and second radial y.

[0117] Of course, in other embodiments, if the first opening structure 21 and the second opening structure 22 are made to be non-rotationally symmetric along the central axis L of the dielectric resonator 20, the first distance d1 can be made equal to the second distance d2 as needed.

[0118] Please see Figure 2 , Figure 3 , Figure 4 , Figure 9 In some embodiments of this application, the first opening 211 is formed on the end face of the dielectric resonator 20 and is located between the outer peripheral surface of the dielectric resonator 20 and the central axis L of the dielectric resonator 20.

[0119] It should be noted that the first opening 211 can be a hole structure or a slot structure. The first opening 211 is formed on the end face of the dielectric resonator 20 and is located between the outer peripheral surface of the dielectric resonator 20 and the central axis L of the dielectric resonator 20. That is, the first opening 211 can connect to at least one end face of the dielectric resonator 20, but not to the outer peripheral surface of the dielectric resonator 20. Among them, the first opening 211 can be exactly centered between the outer peripheral surface of the dielectric resonator 20 and the central axis L of the dielectric resonator 20, or it can be offset towards the outer peripheral surface of the dielectric resonator 20 or towards the central axis L of the dielectric resonator 20.

[0120] By adopting the above scheme, the first opening structure 21 can be used to guide and control the electric field polarization direction of the HE mode along the first radial direction x, and the orientation of the first radial direction x can be directly determined from the end face of the dielectric resonator 20. This facilitates the design of the coupling structure 30 based on the first radial direction x, and allows the coupling structure 30 to be coupled with the HE mode (e.g., HE mode) whose electric field polarization direction is along the first radial direction x. ∥ The coupling strength and coupling effect of the module are as expected.

[0121] By adopting the above scheme, the depth direction of the first opening 211 can correspond to the axial direction of the dielectric resonator 20, which facilitates direct thinning of a specific area of ​​the dielectric resonator 20 along its axial direction. This allows for convenient, controllable, and precise enhancement of the resonant frequencies of the HE mode and the TE mode as needed. Furthermore, since the first opening 211 is located between the outer peripheral surface of the dielectric resonator 20 and its central axis L, and does not connect to the outer peripheral surface, it does not disrupt the integrity of the outer peripheral surface. Therefore, the first opening 211 has minimal impact on the capacitance between the dielectric resonator 20 and the inner wall of the resonator housing 10, resulting in a smaller increase in the resonant frequency of the HE mode and a less significant influence on its resonant frequency. This reduces the impact of the first opening 211 on the resonant frequency of the HE mode. The opening 211 has an excessive impact on the resonant frequency of the HE mode, which may cause the resonant frequency of the HE mode to increase abruptly. This allows for more precise control of the resonant frequency of the HE mode. That is, while increasing the resonant frequency of the HE mode, the resonant frequency of the HE mode can be increased more accurately, precisely, and stably. The resonant frequency of the HE mode can be more accurately controlled to be within the passband and close to the desired frequency band. This avoids the resonant frequency of the HE mode exceeding the passband and the desired frequency band due to the first opening 211 damaging the integrity of the outer peripheral surface of the dielectric resonator 20.

[0122] Furthermore, since the electric field of the TE mode is concentrated around the periphery of the dielectric resonator 20, the first opening 211 has the greatest impact on the resonant frequency of the TE mode when it is located on the outer periphery of the dielectric resonator 20, and the least impact when it is located on the central axis of the dielectric resonator 20. By placing the first opening 211 between the outer peripheral surface of the dielectric resonator 20 and the central axis L of the dielectric resonator 20, the first opening 211 can avoid the outer peripheral surface of the dielectric resonator 20, which can reduce the situation where the resonant frequency of the TE mode increases abruptly due to the excessive influence of the first opening 211 on the resonant frequency of the TE mode; at the same time, the first opening 211 can also avoid the central axis L of the dielectric resonator 20, which can reduce the situation where the resonant frequency of the TE mode cannot increase significantly due to the insufficient influence of the first opening 211 on the resonant frequency of the TE mode. Based on this, it is easier to control the resonant frequency of the TE mode more precisely. That is, while increasing the resonant frequency of the TE mode, the resonant frequency of the TE mode can be increased more accurately, precisely, and stably. The resonant frequency of the TE mode can be controlled more precisely, which makes it easier to design whether the resonant frequency of the TE mode is "within the passband and close to the same frequency band as the resonant frequency of the HE mode". It is also easier for the multimode resonator 1 to be coupled to the two resonant modes of the single cavity and the HE mode as needed, or to be coupled to the three resonant modes of the single cavity and the HE mode and the TE mode as needed, which can improve the performance and design flexibility of the multimode resonator 1.

[0123] Furthermore, since the first opening 211 is located on the end face of the dielectric resonator 20, it is convenient to design a mold and to integrally form the dielectric resonator 20 and its first opening 211 through the mold. In particular, it can improve the demolding convenience of the mold after the dielectric resonator 20 is formed (demolding can be performed along the axial direction of the dielectric resonator 20), improve the molding convenience and molding accuracy of the dielectric resonator 20, and reduce the mold cost and the processing cost of the dielectric resonator 20.

[0124] Of course, such as Figure 10 As shown, in other embodiments, at least one first opening 211 may be formed on the outer peripheral surface of the dielectric resonator 20 and communicate with at least one end face of the dielectric resonator 20. Figure 11As shown, in other embodiments, at least one first opening 211 may be formed on the outer peripheral surface of the dielectric resonator 20 and disposed between the two end faces of the dielectric resonator 20. Theoretically, based on the non-rotationally symmetric structure of the first opening structure 21 and the second opening structure 22 along the central axis L of the dielectric resonator 20, these two embodiments can also achieve precise guidance and control of the two electric field polarization directions of the HE mode along a preset direction. However, since the first opening 211 is formed on the outer peripheral surface of the dielectric resonator 20, the first opening 211 will disrupt the integrity of the outer peripheral surface of the dielectric resonator 20. The first opening 211 may affect the capacitance between the dielectric resonator 20 and the inner wall of the resonator housing 10, and the first opening 211 will affect the increase of the resonant frequency of the HE mode. The amplitude may be large, and the first opening 211 may have a significant impact on the resonant frequency of the HE mode. Based on this, the resonant frequency of the HE mode may increase abruptly due to the significant impact of the first opening 211 on the resonant frequency of the HE mode. Compared with the embodiment in which "the first opening 211 is opened on the end face of the dielectric resonator 20 and is located between the outer peripheral surface of the dielectric resonator 20 and the central axis L of the dielectric resonator 20", these two embodiments are less convenient for finely controlling the resonant frequency of the HE mode. That is, it is relatively more difficult to "control the resonant frequency of the HE mode to be within the passband range and close to the desired frequency band".

[0125] It should be noted that in the three embodiments, namely, "at least one first opening 211 is opened on the end face of the dielectric resonator 20 and is located between the outer peripheral surface of the dielectric resonator 20 and the central axis L of the dielectric resonator 20", "at least one first opening 211 is opened on the outer peripheral surface of the dielectric resonator 20 and communicates with at least one end face of the dielectric resonator 20", and "at least one first opening 211 is opened on the outer peripheral surface of the dielectric resonator 20 and is located between the two end faces of the dielectric resonator 20", one of these embodiments can be selected when there is only one first opening 211; and when there are multiple first openings 211, they can be implemented individually, in pairs, or all in combination.

[0126] It should be noted that since the embodiment in which "at least one first opening 211 is opened on the end face of the dielectric resonator 20 and is located between the outer peripheral surface of the dielectric resonator 20 and the central axis L of the dielectric resonator 20" is more effective, especially in facilitating more precise control of the resonant frequency of the HE mode, this application tends to implement this embodiment alone, that is, tends to implement "all first openings 211 are opened on the end face of the dielectric resonator 20 and are located between the outer peripheral surface of the dielectric resonator 20 and the central axis L of the dielectric resonator 20".

[0127] Please see Figure 2 , Figure 3 , Figure 4 , Figure 9In some embodiments of this application, the second opening 221 is formed on the end face of the dielectric resonator 20 and is located between the outer peripheral surface of the dielectric resonator 20 and the central axis L of the dielectric resonator 20.

[0128] It should be noted that the second opening 221 can be a hole structure or a slot structure. The second opening 221 is formed on the end face of the dielectric resonator 20 and is located between the outer peripheral surface of the dielectric resonator 20 and the central axis L of the dielectric resonator 20. That is, the second opening 221 can connect to at least one end face of the dielectric resonator 20, but not to the outer peripheral surface of the dielectric resonator 20. Among them, the second opening 221 can be exactly centered between the outer peripheral surface of the dielectric resonator 20 and the central axis L of the dielectric resonator 20, or it can be offset towards the outer peripheral surface of the dielectric resonator 20 or towards the central axis L of the dielectric resonator 20.

[0129] By adopting the above scheme, the second opening structure 22 can be conveniently used to guide and control the other electric field polarization direction of the HE mode along the second radial direction y through the second opening 221. Furthermore, the orientation of the second radial direction y can be visually determined from the end face of the dielectric resonator 20. This facilitates the design of the coupling structure 30 based on the second radial direction y, and allows the coupling structure 30 to be coupled with the HE mode (e.g., HE mode) whose electric field polarization direction is along the second radial direction y. ⊥ The coupling strength and coupling effect of the module are as expected.

[0130] By adopting the above scheme, the depth direction of the second opening 221 can correspond to the axial direction of the dielectric resonator 20, which facilitates the direct thinning of a specific area of ​​the dielectric resonator 20 along its axial direction. This allows for convenient, controllable, and precise enhancement of the resonant frequencies of the HE mode and the TE mode as needed. Furthermore, since the second opening 221 is located between the outer peripheral surface of the dielectric resonator 20 and its central axis L, and does not connect to the outer peripheral surface, it does not disrupt the integrity of the outer peripheral surface. Therefore, the second opening 221 has minimal impact on the capacitance between the dielectric resonator 20 and the inner wall of the resonator housing 10, resulting in a smaller increase in the resonant frequency of the HE mode and a less significant influence on its resonant frequency. This reduces the impact of the second opening 221 on the resonant frequency of the HE mode. The second opening 221 has an excessive influence on the resonant frequency of the HE mode, which may cause the resonant frequency of the HE mode to increase abruptly. This allows for more precise control of the resonant frequency of the HE mode. That is, while increasing the resonant frequency of the HE mode, the resonant frequency of the HE mode can be increased more accurately, precisely, and stably. The resonant frequency of the HE mode can be more accurately controlled to be within the passband and close to the desired frequency band. This avoids the resonant frequency of the HE mode exceeding the passband and the desired frequency band due to the second opening 221 damaging the integrity of the outer peripheral surface of the dielectric resonator 20.

[0131] Furthermore, since the electric field of the TE mode is concentrated around the periphery of the dielectric resonator 20, the second opening 221 has the greatest impact on the resonant frequency of the TE mode when it is located on the outer periphery of the dielectric resonator 20, and the least impact when it is located on the central axis of the dielectric resonator 20. By placing the second opening 221 between the outer peripheral surface of the dielectric resonator 20 and the central axis L of the dielectric resonator 20, the second opening 221 can avoid the outer peripheral surface of the dielectric resonator 20, which can reduce the situation where the resonant frequency of the TE mode increases abruptly due to the excessive influence of the second opening 221 on the resonant frequency of the TE mode; at the same time, the second opening 221 can also avoid the central axis L of the dielectric resonator 20, which can reduce the situation where the resonant frequency of the TE mode cannot increase significantly due to the insufficient influence of the second opening 221 on the resonant frequency of the TE mode. Based on this, it is easier to control the resonant frequency of the TE mode more precisely. That is, while increasing the resonant frequency of the TE mode, the resonant frequency of the TE mode can be increased more accurately, precisely, and stably. The resonant frequency of the TE mode can be controlled more precisely, which makes it easier to design whether the resonant frequency of the TE mode is "within the passband and close to the same frequency band as the resonant frequency of the HE mode". It is also easier for the multimode resonator 1 to be coupled to the two resonant modes of the single cavity and the HE mode as needed, or to be coupled to the three resonant modes of the single cavity and the HE mode and the TE mode as needed, which can improve the performance and design flexibility of the multimode resonator 1.

[0132] Furthermore, since the second opening 221 is located on the end face of the dielectric resonator 20, it is convenient to design a mold and to integrally form the dielectric resonator 20 and its second opening 221 through the mold. In particular, it can improve the demolding convenience of the mold after the dielectric resonator 20 is formed (demolding can be performed along the axial direction of the dielectric resonator 20), improve the forming convenience and forming accuracy of the dielectric resonator 20, and reduce the mold cost and the processing cost of the dielectric resonator 20.

[0133] Of course, such as Figure 10 As shown, in other embodiments, at least one second opening 221 may be formed on the outer peripheral surface of the dielectric resonator 20 and communicate with at least one end face of the dielectric resonator 20. Figure 11As shown, in other embodiments, at least one second opening 221 may be formed on the outer peripheral surface of the dielectric resonator 20 and disposed between the two end faces of the dielectric resonator 20. Theoretically, based on the non-rotationally symmetric structure of the second opening structure 22 and the second opening structure 22 along the central axis L of the dielectric resonator 20, these two embodiments can also achieve precise guidance and precise control of the two electric field polarization directions of the HE mode along a preset direction. However, since the second opening 221 is formed on the outer peripheral surface of the dielectric resonator 20, the second opening 221 will disrupt the integrity of the outer peripheral surface of the dielectric resonator 20. The second opening 221 may affect the capacitance between the dielectric resonator 20 and the inner wall of the resonator housing 10, and the second opening 221 will affect the increase of the resonant frequency of the HE mode. The amplitude may be large, and the influence of the second opening 221 on the resonant frequency of the HE mode may be significant. Based on this, the resonant frequency of the HE mode may increase abruptly due to the significant influence of the second opening 221 on the resonant frequency of the HE mode. Compared with the embodiment in which "the second opening 221 is opened on the end face of the dielectric resonator 20 and is located between the outer peripheral surface of the dielectric resonator 20 and the central axis L of the dielectric resonator 20", these two embodiments are less convenient for finely controlling the resonant frequency of the HE mode. That is, it is relatively more difficult to "control the resonant frequency of the HE mode to be within the passband range and close to the desired frequency band".

[0134] It should be noted that in the three embodiments, namely, "at least one second opening 221 is opened on the end face of the dielectric resonator 20 and is located between the outer peripheral surface of the dielectric resonator 20 and the central axis L of the dielectric resonator 20", "at least one second opening 221 is opened on the outer peripheral surface of the dielectric resonator 20 and communicates with at least one end face of the dielectric resonator 20", and "at least one second opening 221 is opened on the outer peripheral surface of the dielectric resonator 20 and is located between the two end faces of the dielectric resonator 20", one of these embodiments can be selected when there is only one second opening 221; and when there are multiple second openings 221, they can be implemented individually, in pairs, or all in combination.

[0135] It should be noted that since the embodiment in which "at least one second opening 221 is opened on the end face of the dielectric resonator 20 and is located between the outer peripheral surface of the dielectric resonator 20 and the central axis L of the dielectric resonator 20" is more effective, especially in facilitating more precise control of the resonant frequency of the HE mode, this application tends to implement this embodiment alone, that is, tends to implement "all second openings 221 are opened on the end face of the dielectric resonator 20 and are located between the outer peripheral surface of the dielectric resonator 20 and the central axis L of the dielectric resonator 20".

[0136] Please see Figure 2 , Figure 4 , Figure 9In some embodiments of this application, the first opening 211 is a hole structure. For example, it can be a through hole or a blind hole, such as a circular hole, a rectangular hole, an oblong hole, an irregularly shaped hole, etc.

[0137] By adopting the above scheme and making the first opening 211 a hole structure, on the one hand, the structural regularity of the first opening 211 can be improved, the structural design of the first opening 211 can be simplified, the mold design can be facilitated, and the dielectric resonator 20 and its first opening 211 can be integrally molded through the mold, thereby improving the molding convenience and molding accuracy of the dielectric resonator 20 and the first opening structure 21. On the other hand, the hole structure has less hollowed-out part, and the hole structure has a smaller impact on the resonant frequency of the HE mode, which can avoid the resonant frequency of the HE mode increasing too much and exceeding the passband range and the required frequency band. The size, shape and position of the hole structure are easier to control and adjust precisely, thereby facilitating the precise guidance and control of one electric field polarization direction of the HE mode along the first radial x, and facilitating the precise control of the resonant frequency of the HE mode and the resonant frequency of the TE mode. This allows the multimode resonator 1 to be coupled to the two resonant modes of the single cavity HE mode as needed, or to the three resonant modes of the single cavity HE mode and the TE mode as needed, thereby improving the performance and design flexibility of the multimode resonator 1.

[0138] This embodiment is particularly suitable for use in conjunction with the embodiment in which "the first opening 211 is opened on the end face of the dielectric resonator 20 and is located between the outer peripheral surface of the dielectric resonator 20 and the central axis L of the dielectric resonator 20". This arrangement allows for more precise control of the resonant frequency of the HE mode.

[0139] Of course, in other embodiments, the first opening 211 can be a groove structure, such as a straight groove, a curved groove, an arc groove, etc.

[0140] Please see Figure 2 , Figure 4 , Figure 9 In some embodiments of this application, the second opening 221 is a hole structure. For example, it can be a through hole or a blind hole, such as a circular hole, a rectangular hole, an oblong hole, an irregularly shaped hole, etc.

[0141] By adopting the above scheme and making the second opening 221 a hole structure, on the one hand, the structural regularity of the second opening 221 can be improved, the structural design of the second opening 221 can be simplified, the mold design can be facilitated, and the dielectric resonator 20 and its second opening 221 can be integrally molded through the mold, thereby improving the molding convenience and molding accuracy of the dielectric resonator 20 and the second opening structure 22. On the other hand, the hole structure has less hollowed-out part, and the hole structure has a smaller impact on the resonant frequency of the HE mode, which can avoid the resonant frequency of the HE mode increasing too much and exceeding the passband range and the required frequency band. The size, shape and position of the hole structure are easier to control and adjust precisely, thereby facilitating the precise guidance and control of one electric field polarization direction of the HE mode along the second radial direction y, and facilitating the precise control of the resonant frequency of the HE mode and the resonant frequency of the TE mode. This allows the multimode resonator 1 to be coupled to the two resonant modes of the single cavity HE mode as needed, or to the three resonant modes of the single cavity HE mode and the TE mode as needed, thereby improving the performance and design flexibility of the multimode resonator 1.

[0142] This embodiment is particularly suitable for use in conjunction with the embodiment in which "the second opening 221 is opened on the end face of the dielectric resonator 20 and is located between the outer peripheral surface of the dielectric resonator 20 and the central axis L of the dielectric resonator 20". This arrangement allows for more precise control of the resonant frequency of the HE mode.

[0143] Of course, in other embodiments, the second opening 221 can be a groove structure, such as a straight groove, a curved groove, an arc groove, etc.

[0144] Please see Figure 3 , Figure 4 , Figure 9 In some embodiments of this application, two first openings 211 are provided, and the two first openings 211 are symmetrically arranged about the central axis L of the dielectric resonator 20. That is, the two first openings 211 are respectively located on both sides of the central axis L of the dielectric resonator 20, the two first openings 211 have the same shape and size, and the distance between the two first openings 211 along the first radial direction x to the central axis L of the dielectric resonator 20 is also the same, so that the two first openings 211 are symmetrically arranged about the central axis L of the dielectric resonator 20.

[0145] By adopting the above scheme, and by providing two first openings 211 and symmetrically arranging the two first openings 211 about the central axis L of the dielectric resonator 20, on the one hand, it is convenient to directly and intuitively determine the first radial direction x by connecting the two first openings 211, without first locating the central axis L of the dielectric resonator 20 and then determining the first radial direction x by connecting the first opening 211 and the central axis L of the dielectric resonator 20. This facilitates the intuitive, rapid, and accurate determination of the orientation of the first radial direction x, and makes it convenient to design the coupling structure 30 based on the first radial direction x. It also enables the coupling structure 30 to be aligned with the HE mode (e.g., HE) along the electric field polarization direction of the first radial direction x. ∥ The coupling strength and coupling effect of the mode meet expectations. On the other hand, it is convenient to adjust the resonant frequencies of the HE mode and the TE mode evenly, precisely, and controllably on opposite sides of the central axis L along the first radial direction x of the dielectric resonator 20 via two first openings 211. This allows for precise control of the resonant frequency of the HE mode to be within the passband and close to the desired frequency band, and for precise control of whether the resonant frequency of the TE mode is "within the passband and close to the same frequency band as the resonant frequency of the HE mode". This allows the multimode resonator 1 to be coupled to the HE mode in a single cavity as needed, or to the HE mode and the TE mode in a single cavity as needed, thereby improving the performance and design flexibility of the multimode resonator 1. Furthermore, the arrangement of "two first openings 211" also facilitates the processing and forming of the first opening structure 21 and the dielectric resonator 20.

[0146] Of course, in other embodiments, the first opening 211 may be one or more.

[0147] Please see Figure 3 , Figure 4 , Figure 9 In some embodiments of this application, two second openings 221 are provided, and the two second openings 221 are symmetrically arranged about the central axis L of the dielectric resonator 20. That is, the two second openings 221 are respectively located on both sides of the central axis L of the dielectric resonator 20, the two second openings 221 have the same shape and size, and the distance between the two second openings 221 along the second radial direction y to the central axis L of the dielectric resonator 20 is also the same, so that the two second openings 221 are symmetrically arranged about the central axis L of the dielectric resonator 20.

[0148] By adopting the above scheme, and by providing two second openings 221 and symmetrically arranging the two second openings 221 about the central axis L of the dielectric resonator 20, on the one hand, it is convenient to directly and intuitively, quickly and accurately determine the second radial direction y by connecting the two second openings 221, without first locating the central axis L of the dielectric resonator 20 and then determining the second radial direction y by connecting the second opening 221 and the central axis L of the dielectric resonator 20. This facilitates the intuitive, quick and accurate determination of the orientation of the second radial direction y, and makes it convenient to design the coupling structure 30 based on the second radial direction y. It also enables the coupling structure 30 to be aligned with the electric field polarization direction along the second radial direction y in the HE mode (e.g., HE). ∥ The coupling strength and coupling effect of the mode meet expectations. On the other hand, it is convenient to adjust the resonant frequencies of the HE mode and the TE mode evenly, precisely, and controllably on opposite sides of the central axis L along the second radial direction y of the dielectric resonator 20 via two second openings 221. This allows for precise control of the resonant frequency of the HE mode to be within the passband and close to the desired frequency band, and for precise control of whether the resonant frequency of the TE mode is "within the passband and close to the same frequency band as the resonant frequency of the HE mode". This allows the multimode resonator 1 to be coupled to the HE mode in a single cavity as needed, or to the HE mode and the TE mode in a single cavity as needed, thereby improving the performance and design flexibility of the multimode resonator 1. Furthermore, the arrangement of "two second openings 221" also facilitates the processing and forming of the second opening structure 22 and the dielectric resonator 20.

[0149] Of course, in other embodiments, the second opening 221 may be one or more.

[0150] Please see Figure 2 , Figure 3 , Figure 9 In some embodiments of this application, the multimode resonator 1 has at least three resonance modes: HE mode and TE mode. The dielectric resonator 20 includes a dielectric body 23 and a dielectric cylinder 24. The dielectric cylinder 24 is erected on the end side of the dielectric body 23 and surrounds the periphery of the dielectric body 23.

[0151] It should be noted that in this embodiment, the multimode resonator 1 has at least three resonance modes: HE mode and TE mode. That is, the multimode resonator 1 can support at least HE mode and TE mode within its passband range. For example, the multimode resonator 1 can be an HE-TE three-mode resonator, an HE-TE-TM four-mode resonator, etc.

[0152] It should also be noted that the dielectric resonator 20 includes a dielectric body 23 and a dielectric cylinder 24. The first opening 211 mentioned above can be provided in the dielectric body 23 or in the dielectric cylinder 24 as needed. The second opening 221 mentioned above can be provided in the dielectric body 23 or in the dielectric cylinder 24 as needed.

[0153] The dielectric body 23 is the part of the dielectric resonator 20 that mainly influences and determines the resonant frequency of the TE mode. For example... Figure 12 As shown, since the electric field of the TE mode is distributed in a horizontal (i.e., parallel to the first wall 11) ring shape and the magnetic field is distributed in a vertical (i.e., perpendicular to the first wall 11) ring shape, the electric field of the TE mode will be concentrated in the center of the resonant cavity and form a ring. Therefore, the resonant frequency of the TE mode can be influenced and determined by the dielectric body 23, which is basically located at the center of the resonant cavity. Specifically, the resonant frequency of the TE mode can be adjusted by adjusting the radial dimension and height (i.e., the dimension along the axial direction of the dielectric body 23, also known as the thickness) of the dielectric body 23, and can also be adjusted by adjusting the size of the resonant cavity. Among them, the larger the radial dimension of the dielectric body 23, the lower the resonant frequency of the TE mode; the smaller the radial dimension of the dielectric body 23, the higher the resonant frequency of the TE mode. The larger the height of the dielectric body 23, the lower the resonant frequency of the TE mode; the smaller the height of the dielectric body 23, the higher the resonant frequency of the TE mode. The medium body 23 may be, but is not limited to, disc-shaped, columnar, block-shaped, etc. The cross-sectional shape of the medium body 23 perpendicular to its axis may be, but is not limited to, circular, rectangular, square, polygonal, petal-shaped, cross-shaped, etc. The cross-sectional shape of the medium body 23 parallel to its axis may be, but is not limited to, circular, rectangular, square, polygonal, petal-shaped, cross-shaped, etc. For example, such as... Figure 2 , Figure 3 As shown, in some embodiments, the medium body 23 is cylindrical or prismatic.

[0154] The dielectric cylinder 24 is the part of the dielectric resonator 20 mainly used to lower the resonant frequency of the HE mode. There may be one or two dielectric cylinders 24. When there is one dielectric cylinder 24, it can be erected on the end of the dielectric body 23 facing the first wall 11, or it can be erected on the end of the dielectric body 23 facing away from the first wall 11. Figure 9 As shown, when two dielectric cylinders 24 are provided, one dielectric cylinder 24 can be erected on the end side of the dielectric body 23 facing the first wall 11, and the other dielectric cylinder 24 can be erected on the end side of the dielectric body 23 facing away from the first wall 11. The dielectric cylinders 24 are cylindrical and surround the periphery of the dielectric body 23. Since the addition of dielectric cylinders 24 increases the capacitance between the outer peripheral wall of the dielectric resonator 20 and the inner wall of the resonator housing 10, the arrangement of dielectric cylinders 24 can lower the resonant frequency of the HE mode. The greater the sum of the heights of all dielectric cylinders 24 (i.e., the dimension along the axial direction of the dielectric resonator 20), the lower the resonant frequency of the HE mode.

[0155] Based on this, by adopting the above scheme, the resonant frequency of the TE mode can be adjusted by changing the size of the resonant cavity, the radial dimension and height of the dielectric body 23, so as to tune the resonant frequency of the TE mode to near the center frequency of the passband. One or two dielectric cylinders 24 can be added to lower the resonant frequency of the HE mode, thereby tuning the resonant frequency of the HE mode to near the center frequency of the passband. This allows the resonant frequency of the HE mode to approach and be close to the resonant frequency of the TE mode, within the same frequency band and passband range. This facilitates the implementation of single-cavity coupled HE mode and TE mode resonant modes in the multimode resonator 1, improving the performance and design flexibility of the multimode resonator 1.

[0156] Furthermore, since the multimode resonator 1 can achieve at least a third-order filtering effect, it is equivalent to the filtering effect of at least three single-mode resonators, that is, equivalent to the filtering effect of at least three microwave resonators, thereby improving the performance and space utilization of the multimode resonator 1. Moreover, the multimode resonator 1 has a smaller size, which is beneficial for miniaturization and weight reduction. Furthermore, compared to existing technologies that achieve multimode solely based on openings and slots, this multimode resonator 1 primarily achieves three modes by changing the shape of the dielectric resonator 20, resulting in a higher Q-value (Quality Factor), less energy loss in the resonant circuit, and better performance.

[0157] like Figure 1 , Figure 13 As shown, in a specific application example, multimode resonator 1 is coupled with three orthogonal resonant modes: HE mode and TE mode, making it a HE-TE tri-mode resonator. In this HE-TE tri-mode resonator, the resonant frequency of the HE mode is close to that of the TE mode, around 1.8 GHz. The Q value of the HE mode can reach 15000, and the Q value of the TE mode can reach 11000. The nearest mode 4 outside the passband is 500 MHz away, resulting in minimal impact on near-end suppression.

[0158] Please see Figure 3 , Figure 9 In some embodiments of this application, a medium cylinder 24 is erected on the end side of the medium body 23 facing the first wall 11, and a coupling structure 30 is disposed between the medium body 23 and the first wall 11 and inside the medium cylinder 24.

[0159] It should be noted that a medium cylinder 24 is erected on the end side of the medium body 23 facing the first wall 11. This includes both the case where "there is one medium cylinder 24 erected on the end side of the medium body 23 facing the first wall 11" and the case where "there are two medium cylinders 24, one of which is erected on the end side of the medium body 23 facing the first wall 11, and the other is erected on the end side of the medium body 23 facing away from the first wall 11".

[0160] By adopting the above scheme, when the coupling structure 30 is located between the dielectric body 23 and the first wall 11, the coupling structure 30 can be placed inside the dielectric cylinder 24. Based on this, on the one hand, the coupling structure 30 and the dielectric cylinder 24 can share space, compressing the total space occupied by the coupling structure 30 and the dielectric cylinder 24, thereby optimizing and compacting the structural layout of the multimode resonator 1, which is beneficial for the miniaturization of the multimode resonator 1. On the other hand, since the coupling structure 30 is housed inside the dielectric cylinder 24, the structure of the dielectric cylinder 24 will not be damaged by the coupling structure 30, and the performance and indicators of the multimode resonator 1 will not be affected, thus optimizing the overall performance of the multimode resonator 1.

[0161] Please see Figure 1 , Figure 2 In some embodiments of this application, when the multimode resonator 1 has at least three resonance modes, namely HE mode and TE mode, the multimode resonator 1 includes a metal disk 40 and an insulating member (not shown in the figure). The metal disk 40 is connected to the second wall 12 of the resonator housing 10 through the insulating member. The second wall 12 is disposed opposite to the first wall 11. The metal disk 40 and the dielectric body 23 are disposed opposite to each other along the axial direction of the dielectric body 23. The distance between the metal disk 40 and the dielectric body 23 is adjustable to adjust the resonant frequency of the TE mode.

[0162] It should be noted that the metal disk 40 has a disk-shaped structure and can be made of metal material, or it can be made by covering the surface of an insulating disk-shaped structure with metal material. The metal disk 40 can be a circular disk, a polygonal disk, or other shapes. Along the axial direction of the dielectric body 23, the metal disk 40 is arranged opposite to the dielectric body 23. The metal disk 40 is connected to the second wall 12 through an insulating member, so that the metal disk 40 is insulated from the second wall 12, so that the metal disk 40 is not grounded, so that the metal disk 40 is suspended between the second wall 12 and the dielectric body 23, so that the metal disk 40 can compress the magnetic field of the TE mode. The insulating member can be, but is not limited to, a plastic part, a wooden part, a ceramic part, a quartz part, a glass part, etc. The second wall 12 is the wall of the resonator housing 10 opposite to the first wall 11.

[0163] In some embodiments, the metal disk 40 may have a through hole, through which an insulating member may pass to connect the metal disk 40. Of course, in other embodiments, the through hole may be omitted from the metal disk 40, and the insulating member may be connected to the metal disk 40 by means of bonding, welding, snap-fitting, etc.

[0164] An insulating component is inserted through the second wall 12 and can move axially relative to the second wall 12 to move the metal disk 40 in a direction closer to or further away from the dielectric body 23, thereby adjusting the distance between the metal disk 40 and the dielectric body 23. As the distance between the metal disk 40 and the dielectric body 23 decreases, the metal disk 40 can enhance its compression effect on the magnetic field of the TE mode, thereby increasing the resonant frequency of the TE mode. In the case where a dielectric cylinder 24 is provided on the end of the dielectric body 23 facing away from the first wall 11, as the distance between the metal disk 40 and the dielectric body 23 decreases, the metal disk 40 may be located inside the dielectric cylinder 24.

[0165] By adopting the above scheme, the distance between the metal disk 40 and the dielectric body 23 can be conveniently and quickly adjusted relative to the second wall 12 by moving the insulating element along its axial direction. This allows the ungrounded metal disk 40 to move closer to or further away from the dielectric body 23 via the insulating element. Based on this, the compression effect of the metal disk 40 on the magnetic field of the TE mode can be adjusted by regulating the distance between the metal disk 40 and the dielectric body 23, thereby achieving independent and precise adjustment of the resonant frequency of the TE mode. Tuning is convenient, quick, and accurate. In other words, this embodiment allows independent tuning of the resonant frequency of the TE mode via the ungrounded metal disk 40, with minimal impact on the resonant frequency of the HE mode. Specifically, the smaller the distance between the metal disk 40 and the dielectric body 23, the more the metal disk 40 compresses the magnetic field of the TE mode, resulting in a higher resonant frequency of the TE mode; conversely, the larger the distance between the metal disk 40 and the dielectric body 23, the weaker the compression effect of the metal disk 40 on the magnetic field of the TE mode, resulting in a lower resonant frequency of the TE mode.

[0166] In addition, the compression effect of the metal disk 40 on the magnetic field of the TE mode can be enhanced by replacing it with a larger metal disk 40, thereby increasing the resonant frequency of the TE mode.

[0167] Please see Figure 1 , Figure 2 , Figure 3 In some embodiments of this application, the multimode resonator 1 includes a ceramic base 50, which is separately connected between the dielectric resonator 20 and the first wall 11.

[0168] It should be noted that the ceramic base 50 is made of ceramic material and is a non-metallic, insulating structure. In some embodiments, the ceramic base 50 may be an alumina base. Since both the ceramic base 50 and the dielectric resonator 20 are non-metallic, they are easily connected and fixed, improving the connection strength, reliability, and stability between them. The connection between the ceramic base 50 and the dielectric resonator 20 can be achieved through methods such as, but not limited to, bonding and welding.

[0169] Furthermore, due to the superior strength and impact resistance of the ceramic base 50, it is easier to connect and fix the ceramic base 50 to the metal first wall 11, thereby reducing the risk of damage to the dielectric resonator 20 due to the connection operation. The connection between the ceramic base 50 and the first wall 11 can be achieved by, but is not limited to, bonding, welding, riveting, or screw fastening.

[0170] By adopting the above solution, the ceramic base 50, which is also a non-metallic component, can be easily connected and fixed to the dielectric resonator 20. This improves the connection strength, reliability, and stability between the ceramic base 50 and the dielectric resonator 20, reduces the risk of damage to the dielectric resonator 20 during connection operations, and lowers the connection difficulty and cost. Furthermore, it facilitates the connection and fixation of the ceramic base 50, which has better strength and impact resistance, to the metal first wall 11, further reducing the risk of damage to the dielectric resonator 20 during connection operations and improving the connection convenience, strength, reliability, and stability between the ceramic base 50 and the first wall 11. Therefore, the connection and fixation between the dielectric resonator 20 and the first wall 11 can be conveniently, quickly, and reliably achieved using the ceramic base 50.

[0171] Furthermore, since the ceramic base 50 is an insulating structure, the dielectric resonator 20 is connected and fixed to the first wall 11 via the ceramic base 50, which allows the dielectric resonator 20 to be set without grounding. Based on this, the introduction of the TM mode resonance mode to the vicinity of the passband due to the grounding connection of the dielectric resonator 20 to the first wall 11 can be basically avoided. This can promote the multimode resonator 1 to be in a single-cavity uncoupled TM mode resonance mode, reduce the mode complexity of the multimode resonator 1, and improve the performance and design flexibility of the multimode resonator 1.

[0172] Of course, in other embodiments, the dielectric resonator 20 may be directly connected and fixed to the first wall 11 by means of welding, bonding, riveting, pressing, plugging, screw fastening, threaded connection, snap-fitting, etc., or may be indirectly connected and fixed to the first wall 11 by other structures connected to it (such as base platform, coupling rib, etc.).

[0173] Please see Figure 1 , Figure 2 , Figure 3 In some embodiments of this application, the ceramic base 50 is ring-shaped, and the coupling structure 30 is disposed between the dielectric resonator 20 and the first wall 11, and is disposed within the ring of the ceramic base 50.

[0174] By adopting the above scheme, when the dielectric resonator 20 is connected and fixed to the first wall 11 via the ceramic base 50, and the coupling structure 30 is disposed between the dielectric resonator 20 and the first wall 11, the ceramic base 50 can be arranged in a ring shape, and the coupling structure 30 can be disposed within the ring of the ceramic base 50. Based on this, on the one hand, the coupling structure 30 and the ceramic base 50 can share space, which can compress the total space occupied by the coupling structure 30 and the ceramic base 50, thereby optimizing and compacting the structural layout of the multimode resonator 1, which is beneficial to the miniaturization of the multimode resonator 1. On the other hand, the ceramic base 50 can be arranged away from the coupling structure 30 and the dielectric resonator 20, which can reduce the impact of the arrangement of the ceramic base 50 on the coupling strength and coupling effect between the coupling structure 30 and the HE dual mode, thereby optimizing the coupling strength and coupling effect between the coupling structure 30 and the HE dual mode, and optimizing the overall performance of the multimode resonator 1.

[0175] Please see Figure 1 , Figure 2 , Figure 3 , Figure 4 In some embodiments of this application, the multimode resonator 1 includes a first tuning screw 60, which is threaded to the resonator housing 10 and disposed on a first radial direction x.

[0176] It should be noted that one electric field polarization direction of the HE mode is along the first radial direction x. Therefore, the first tuning screw 60 located on the first radial direction x is used to adjust the resonant frequency of the submode of the HE mode whose electric field polarization direction is along the first radial direction x. For example, HE... ∥ The electric field polarization direction of the mode is along the first radial direction x (please refer to the following). Figure 5 Therefore, the first tuning screw 60 located on the first radial direction x is used to adjust HE. ∥ The mode's resonant frequency can be adjusted by approximately 15 MHz.

[0177] The number of first tuning screws 60 may be one or more. The first tuning screw 60 may be threadedly connected to any wall portion of the resonator housing 10 (e.g., the first wall 11, the second wall 12 opposite to the first wall 11, or the side wall 13 connecting the first wall 11 and the second wall 12). The first tuning screw 60 may be directly threadedly connected to a threaded hole in the corresponding wall portion; alternatively, a first mounting member (not shown in the figure) may be embedded in the corresponding wall portion, and the first tuning screw 60 may be threadedly connected to the threaded hole of the first mounting member. The first tuning screw 60 is grounded based on its connection to the resonator housing 10.

[0178] Based on the first tuning screw 60 being positioned in the first radial direction x, the specific position of the first tuning screw 60 relative to the dielectric resonator 20 can be flexibly set. For example... Figure 4As shown, in some embodiments, the first tuning screw 60 may be located on the periphery of the dielectric resonator 20 along the first radial direction x; in this case, when there are multiple first tuning screws 60, the multiple first tuning screws 60 may be located only on the same side of the dielectric resonator 20 along the first radial direction x, or they may be located on opposite sides of the dielectric resonator 20 along the first radial direction x. In other embodiments, the first tuning screw 60 may be disposed corresponding to the dielectric resonator 20 along the axial direction of the dielectric resonator 20; in this case, the first tuning screw 60 may be spaced apart from the dielectric resonator 20 along the axial direction of the dielectric resonator 20, and the first tuning screw 60 may also extend into the dielectric resonator 20 (at this time, the dielectric resonator 20 may have a clearance hole for the first tuning screw 60 to extend into; or, when the dielectric resonator 20 has the first opening 211 mentioned above, the first tuning screw 60 may also extend into the first opening 211, and the first opening 211 may be used as a clearance hole for the first tuning screw 60 to extend into).

[0179] By adopting the above scheme, the length of the portion of the first tuning screw 60 extending into the resonator housing 10 can be conveniently and quickly adjusted by screwing it in or out. Based on this, the HE mode (e.g., HE) along the first radial direction x can be affected by adjusting the length of the portion of the first tuning screw 60 extending into the resonator housing 10. ∥ The electric field of the HE mode (e.g., HE) can be independently and finely adjusted along the first radial x-axis, thereby enabling independent adjustment and fine adjustment of the electric field polarization direction of the HE mode (e.g., HE). ∥ The resonant frequency of the HE mode (e.g., HE) can be easily, quickly, and accurately tuned. Specifically, in this embodiment, the resonant frequency of the HE mode (e.g., HE) along the first radial direction x can be tuned via a grounded first tuning screw 60 located in the first radial direction x. ∥ The resonant frequency of the HE mode (e.g., HE) is independently tuned, and the electric field polarization direction along the second radial direction y is basically unaffected. ⊥ The resonant frequencies of the HE mode and the TE mode are determined. Specifically, the longer the portion of the first tuning screw 60 extending into the resonator housing 10, the higher the electric field polarization direction along the first radial x-axis. ∥ The lower the resonant frequency of the HE mode (e.g., HE), the shorter the length of the portion of the first tuning screw 60 extending into the resonator housing 10, and the higher the resonant frequency of the HE mode (e.g., HE) with the electric field polarization direction along the first radial x. ∥ The higher the resonant frequency of the mode, the better.

[0180] Please see Figure 1 , Figure 2 , Figure 3 , Figure 4 In some embodiments of this application, the multimode resonator 1 includes a second tuning screw 70, which is threaded to the resonator housing 10 and disposed on the second radial direction y.

[0181] It should be noted that one electric field polarization direction of the HE mode is along the second radial direction y. Therefore, the second tuning screw 70 located on the second radial direction y is used to adjust the resonant frequency of the submode of the HE mode whose electric field polarization direction is along the second radial direction y. For example, HE... ⊥ The electric field polarization direction of the mode is along the second radial direction y (please refer to the following). Figure 6 Therefore, the second tuning screw 70 located on the second radial direction y is used to adjust HE. ⊥ The mode's resonant frequency can be adjusted by approximately 15 MHz.

[0182] The number of second tuning screws 70 may be one or more. The second tuning screw 70 may be threadedly connected to any wall portion of the resonator housing 10 (e.g., the second wall 12, the second wall 12 opposite to the second wall 12, or the side wall 13 connecting the second wall 12 and the second wall 12). The second tuning screw 70 may be directly threadedly connected to a threaded hole in the corresponding wall portion; alternatively, a second mounting member (not shown in the figure) may be embedded in the corresponding wall portion, and the second tuning screw 70 may be threadedly connected to a threaded hole in the second mounting member. The second tuning screw 70 is grounded based on its connection to the resonator housing 10.

[0183] Based on the second tuning screw 70 being positioned in the second radial direction y, the specific position of the second tuning screw 70 relative to the dielectric resonator 20 can be flexibly set. For example... Figure 4 As shown, in some embodiments, the second tuning screw 70 may be located on the periphery of the dielectric resonator 20 along the second radial direction y; in this case, when there are multiple second tuning screws 70, the multiple second tuning screws 70 may be located only on the same side of the dielectric resonator 20 along the second radial direction y, or they may be located on opposite sides of the dielectric resonator 20 along the second radial direction y. In other embodiments, the second tuning screw 70 may be disposed corresponding to the dielectric resonator 20 along the axial direction of the dielectric resonator 20; in this case, the second tuning screw 70 may be spaced apart from the dielectric resonator 20 along the axial direction of the dielectric resonator 20, and the second tuning screw 70 may also extend into the dielectric resonator 20 (at this time, the dielectric resonator 20 may have a clearance hole for the second tuning screw 70 to extend into; or, when the dielectric resonator 20 has the second opening 221 mentioned above, the second tuning screw 70 may also extend into the second opening 221, and the second opening 221 may be used as a clearance hole for the second tuning screw 70 to extend into).

[0184] By adopting the above scheme, the length of the portion of the second tuning screw 70 extending into the resonator housing 10 can be conveniently and quickly adjusted by screwing it in or out. Based on this, the HE mode (e.g., HE) along the second radial direction y can be affected by adjusting the length of the portion of the second tuning screw 70 extending into the resonator housing 10. ⊥The electric field of the HE mode (e.g., HE) can be independently and finely adjusted along the second radial direction y, thereby enabling independent adjustment and fine adjustment of the electric field polarization direction. ⊥ The resonant frequency of the HE mode (e.g., HE) can be easily, quickly, and accurately tuned. Specifically, in this embodiment, the resonant frequency of the HE mode (e.g., HE) along the second radial direction y can be tuned via a grounded second tuning screw 70 located in the second radial direction y. ⊥ The resonant frequency of the HE mode (e.g., HE) is independently tuned, and the electric field polarization direction along the first radial x is basically unaffected. ∥ The resonant frequencies of the HE mode and the TE mode are determined. Specifically, the longer the portion of the second tuning screw 70 extending into the resonator housing 10, the higher the electric field polarization direction along the second radial direction y. ⊥ The lower the resonant frequency of the mode, the higher the resonant frequency; conversely, the shorter the length of the portion of the second tuning screw 70 extending into the resonator housing 10, the higher the resonant frequency of the HE mode (e.g., HE mode) with the electric field polarization direction along the second radial direction y. ⊥ The higher the resonant frequency of the mode, the better.

[0185] Please see Figure 14 Some embodiments of this application provide a filter, including the multimode resonator 1 provided in the embodiments of this application.

[0186] It should be noted that the filter may include one or more resonators, and at least one resonator is the multimode resonator 1 provided in the embodiments of this application. When there are multiple resonators, the multiple resonators can be arranged in a specific layout, and coupling relationships can be established between adjacent resonators as needed.

[0187] By adopting the above scheme, the filter can be coupled by using the multimode resonator 1 provided in the embodiments of this application, thereby improving the performance and power capacity of the filter.

[0188] Furthermore, based on some embodiments of this application, the multimode resonator 1 can precisely control the two electric field polarization directions of the HE mode along a preset direction, and the two electric field polarization directions of the HE mode can be directly determined. Therefore, it is convenient for the multimode resonator 1 to be based on the coupling structure 30 (such as...). Figure 3 As shown, it constructs its own HE dual-mode coupling, which also facilitates the design of HE mode related coupling between the multimode resonator 1 and adjacent resonators.

[0189] For example, such as Figure 14 , Figure 15 , Figure 16 As shown, in a specific example of the filter, the filter includes two multimode resonators 1 provided in the embodiments of this application. This filter is a 2-cavity, 6th-order, 4-zero filter. The HE of each multimode resonator 1... ⊥ Model, TE model, HE ∥ The modules are coupled sequentially, and HE ⊥Model and HE ∥ Model (based on) Figure 3 The coupling structure 30 shown is used for phase coupling. The two multimode resonators 1 are HE ∥ The electric field polarization direction of each mode is along the first radial direction x. A coupling window 2 is provided between two adjacent multimode resonators 1, and the first radial direction x of both multimode resonators 1 corresponds to the penetration direction of the coupling window 2. The HE of the two multimode resonators 1... ∥ The modes can be directly coupled via coupling window 2. A metal boom 3 can be installed in coupling window 2, connecting the two multimode resonators 1. ∥ The coupling of the mold can be enhanced via the metal fly rod 3.

[0190] The above description is merely a preferred embodiment of this application and is not intended to limit this application. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A multimode resonator, characterized in that, The multimode resonator has at least two resonance modes: HE mode and H mode. The multimode resonator includes: Resonator housing; A dielectric resonator is disposed inside the resonator housing and connected to the first wall of the resonator housing; the two electric field polarization directions of the HE mode are respectively along a first radial direction and a second radial direction, and the first radial direction and the second radial direction intersect perpendicularly at the central axis of the dielectric resonator; A coupling structure is disposed on the end side of the dielectric resonator and intersects the central axis of the dielectric resonator perpendicularly. The coupling structure is set at an angle to the first radial direction and at an angle to the second radial direction to enable HE dual-mode coupling.

2. The multimode resonator as described in claim 1, characterized in that, The coupling structure is a rib.

3. The multimode resonator as described in claim 2, characterized in that, The coupling structure is disposed between the dielectric resonator and the first wall.

4. The multimode resonator as described in claim 1, characterized in that, The coupling structure is a metal layer metallized on the end face of the dielectric resonator.

5. The multimode resonator as described in claim 1, characterized in that, The coupling structure forms a 45° angle with the first radial direction and a 45° angle with the second radial direction.

6. The multimode resonator as described in claim 1, characterized in that, The coupling structure changes the coupling polarity between the HE dual modes by rotating 90° around the central axis of the dielectric resonator.

7. The multimode resonator as described in claim 1, characterized in that, The multimode resonator includes a coupling adjustment screw, which is threaded to the resonator housing and positioned in the extension direction of the coupling structure.

8. The multimode resonator as described in any one of claims 1-7, characterized in that, The dielectric resonator has a first opening structure in the first radial direction and a second opening structure in the second radial direction. The first opening structure includes at least one first opening, and the second opening structure includes at least one second opening. The first opening structure and the second opening structure are non-rotationally symmetric along the central axis of the dielectric resonator, so that the two electric field polarization directions of the HE mode are along the first radial direction and the second radial direction, respectively.

9. The multimode resonator as described in claim 8, characterized in that, When there is one first opening, the distance between the first opening and the central axis of the dielectric resonator along the first radial direction is the first distance; when there are multiple first openings, the distance between the two farthest first openings along the first radial direction is the first distance. When there is one second opening, the distance between the second opening and the central axis of the dielectric resonator along the second radial direction is the second distance; when there are multiple second openings, the distance between the two second openings that are furthest apart along the second radial direction is the second distance. The first distance is not equal to the second distance.

10. The multimode resonator as described in claim 8, characterized in that, The first opening is formed on the end face of the dielectric resonator and is located between the outer peripheral surface of the dielectric resonator and the central axis of the dielectric resonator. And / or, the second opening is formed on the end face of the dielectric resonator and is located between the outer peripheral surface of the dielectric resonator and the central axis of the dielectric resonator.

11. The multimode resonator as described in claim 8, characterized in that, The first opening is a hole structure; and / or, the second opening is a hole structure.

12. The multimode resonator as described in any one of claims 1-7, characterized in that, The multimode resonator has at least three resonance modes: HE mode and TE mode. The dielectric resonator includes a dielectric body and a dielectric cylinder. The dielectric cylinder is erected on one end of the dielectric body and surrounds the periphery of the dielectric body.

13. The multimode resonator as described in claim 12, characterized in that, The medium body is provided with the medium cylinder on the end facing the first wall, and the coupling structure is provided between the medium body and the first wall and inside the medium cylinder.

14. The multimode resonator as described in claim 12, characterized in that, The multimode resonator includes a metal disk and an insulating component. The metal disk is connected to the second wall of the resonator housing through the insulating component. The second wall is disposed opposite to the first wall. The metal disk and the dielectric body are disposed opposite to each other along the axial direction of the dielectric body. The distance between the metal disk and the dielectric body is adjustable to adjust the resonant frequency of the TE mode.

15. The multimode resonator as described in any one of claims 1-7, characterized in that, The multimode resonator includes a ceramic base, which is separately connected between the dielectric resonator and the first wall.

16. The multimode resonator as described in claim 15, characterized in that, The ceramic base is ring-shaped, and the coupling structure is located between the dielectric resonator and the first wall, and is located inside the ring of the ceramic base.

17. The multimode resonator as described in any one of claims 1-7, characterized in that, The multimode resonator includes a first tuning screw, which is threaded to the resonator housing and disposed in the first radial direction; And / or, the multimode resonator includes a second tuning screw, which is threaded to the resonator housing and disposed in the second radial direction.

18. A filter, characterized in that, Includes the multimode resonator as described in any one of claims 1-17.

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