Four-mode resonator and filter

Abstract

The invention relates to the field of communication, and provides a four-mode resonator and a filter. The four-mode resonator comprises a resonator shell and a dielectric resonance part, and the resonator shell is provided with a grounding part; the dielectric resonance part is arranged in the resonator shell, one end of the dielectric resonance part is connected to the grounding part, the dielectric resonance part is provided with an annular concave part, the annular concave part continuously or intermittently surrounds to form an annular shape, the central axis of the annular concave part coincides with the central axis of the dielectric resonance part, the concave bottom of the annular concave part is closed, and the grounding part seals a notch of the annular concave part. Therefore, the resonant frequency of the HE dual mode, the resonant frequency of the TE mode and the resonant frequency of the TM mode are in the same frequency band. The four-mode resonator can be used for coupling four resonance modes of a TE mode, a TM mode and an HE dual mode in a single cavity, a four-order filtering effect can be achieved, the resonator performance can be improved, the mode of achieving four modes of the four-mode resonator does not need to greatly increase the size of a dielectric resonance piece, miniaturization of the overall size of the resonator is facilitated, and the requirements for high performance and miniaturization can be met at the same time.

Description

Technical Field

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

[0002] Currently, common resonators in the industry include TEM (Transverse Electric and Magnetic Field) mode single-mode resonators and HE (Hybrid Electromagnetic Mode) mode dual-mode resonators. However, with the rapid development of microwave wireless communication technology, frequency band resources are becoming increasingly scarce. This phenomenon places unprecedented demands on the performance and size design of resonators. Therefore, related industries urgently need to conduct in-depth research and development of multimode resonators to meet the requirements of high performance and miniaturization. Summary of the Invention

[0003] This application provides a four-mode resonator and filter, aiming to solve the problem of how to improve resonator performance while miniaturizing it.

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

[0005] Firstly, a four-mode resonator is provided, comprising:

[0006] The resonator housing has a grounding component;

[0007] A dielectric resonator is disposed within the resonator housing. One end of the dielectric resonator is connected to the grounding component. The dielectric resonator has an annular recess that is continuously or intermittently arranged in a ring shape. The central axis of the annular recess coincides with the central axis of the dielectric resonator. The bottom of the annular recess is closed. The grounding component closes the opening of the annular recess so that the resonant frequency of the HE dual-mode is in the same frequency band as the resonant frequencies of the TE mode and the TM mode.

[0008] In some embodiments, at least one of the annular recesses is a first annular portion, which is formed on the end face of the dielectric resonator facing the grounding component, and is disposed between the outer peripheral surface of the dielectric resonator and the central axis of the dielectric resonator.

[0009] In some embodiments, the grounding component includes a grounding platform disposed on the end side of the dielectric resonator, and a grounding ring connected to the grounding platform and surrounding the outer periphery of the dielectric resonator, wherein one end of the dielectric resonator away from the grounding platform protrudes from the grounding ring.

[0010] In some embodiments, at least one of the annular recesses is a second annular portion formed on the periphery of the dielectric resonator, the second annular portion being connected to the outer peripheral surface of the dielectric resonator and the end face of the dielectric resonator facing the grounding platform;

[0011] And / or, at least one of the annular recesses is a third annular portion formed on the outer peripheral surface of the dielectric resonator, the third annular portion being disposed between the two end faces of the dielectric resonator.

[0012] In some embodiments, at least one of the annular recesses is an annular groove.

[0013] In some embodiments, the dielectric resonator has an opening structure for increasing the resonant frequency of the TE mode.

[0014] In some embodiments, the dielectric resonator includes a dielectric body having the annular recess and a dielectric rod disposed on the side of the dielectric body facing the grounding component, the dielectric body being connected to the grounding component via the dielectric rod.

[0015] In some embodiments, the annular recess is located on the outer periphery of the medium rod.

[0016] In some embodiments, the grounding component is provided with a positioning groove, and the dielectric rod is inserted into the positioning groove.

[0017] In some embodiments, the dielectric resonator includes a dielectric body having the annular recess and a dielectric post disposed on the side of the dielectric body away from the grounding component, the dielectric post being spaced apart from the corresponding wall of the resonator housing.

[0018] In some embodiments, the dielectric resonator is a rotationally symmetric structure.

[0019] Secondly, a filter is provided, including the four-mode resonator provided in the embodiments of this application.

[0020] The advantages of the four-mode resonator provided in this application are as follows:

[0021] The four-mode resonator provided in this application embodiment can close the notch of the annular recess through a grounding component, so that the grounding component and the annular recess can enclose at least one closed air cavity. This air cavity causes the electric field path of the HE dual-mode to be vertically distributed, and forces most, or even all, of the electric field path of the HE dual-mode to bend around the air cavity. This lengthens the electric field path of the HE dual-mode, lowers its resonant frequency, and brings it closer to the resonant frequencies of the TE and TM modes. Furthermore, it ensures that the resonant frequencies of the HE dual-mode, TE mode, and TM mode are all within the passband and close to the same frequency band. Therefore, the four-mode resonator can achieve four resonant modes—TE mode, TM mode, and HE dual-mode—coupled in a single cavity, achieving a fourth-order filtering effect equivalent to the filtering effect of four series-connected single-mode resonators. This optimizes and improves the performance and space utilization of the four-mode resonator. Furthermore, compared to existing multimode resonators, this quad-mode resonator only requires the addition of an annular recess to the structure of the TE-TM dual-mode resonator, and the annular recess is sealed with a grounding component. The quad-mode resonator achieves four modes without significantly increasing the size of the dielectric resonator, which is beneficial for miniaturizing the overall size of the quad-mode resonator. This allows the quad-mode resonator to meet both the requirements of high performance and miniaturization. Attached Figure Description

[0022] 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.

[0023] Figure 1 A three-dimensional schematic diagram of a four-mode resonator provided for some embodiments of this application;

[0024] Figure 2 for Figure 1 A cross-sectional view of a four-mode resonator is provided.

[0025] Figure 3 for Figure 2 A three-dimensional schematic diagram of the provided dielectric resonator;

[0026] Figure 4 This is a schematic diagram of an annular recess provided in some other embodiments of this application, wherein the annular recess is discontinuously arranged in a ring shape;

[0027] Figure 5 for Figure 1 The electric field distribution diagram of the TE mode of the provided four-mode resonator;

[0028] Figure 6 for Figure 1 The electric field distribution diagram of the TM mode of the provided four-mode resonator;

[0029] Figure 7 for Figure 1 The provided electric field distribution diagram for the HE dual-mode of the four-mode resonator;

[0030] Figure 8 for Figure 1 The provided frequency simulation diagram of the four-mode resonator shows that the blue line represents the TE mode, the orange line represents the TM mode, and the red and green lines represent the HE dual mode. The resonant frequencies of the HE dual mode, the TE mode, and the TM mode are close to 2.4 GHz.

[0031] Figure 9 for Figure 1 The provided simulation diagram of the Q value of the four-mode resonator shows that the blue line represents the TE mode, the orange line represents the TM mode, and the red and green lines represent the HE dual mode. The Q value of the HE dual mode is about 6400, the Q value of the TE mode is about 9800, and the Q value of the TM mode is about 7200.

[0032] Figure 10 A cross-sectional view of a four-mode resonator provided for other embodiments of this application, wherein the dielectric resonator has a first annular portion and a second annular portion;

[0033] Figure 11 A cross-sectional view of a four-mode resonator provided for other embodiments of this application, wherein the dielectric resonator has a first annular portion and a third annular portion;

[0034] Figure 12 This is a cross-sectional view of a four-mode resonator provided in some other embodiments of this application, wherein the dielectric resonator has an annular recess and an opening structure.

[0035] The following are the labeling elements in the figure:

[0036] 10-Resonator housing, 11-Grounding component, 111-Grounding platform, 112-Grounding ring, 113-Positioning groove, 12-First wall, 13-Resonant cavity;

[0037] 20-Dielectric resonator, 21-Annular recess, 211-First annular portion, 212-Second annular portion, 213-Third annular portion, 214-Annular groove, 215-Arc groove, 22-Open structure, 23-Dielectric body, 24-Dielectric rod, 25-Dielectric column; 30-Adjusting screw, L-Central axis of dielectric resonator, y-First direction. Detailed Implementation

[0038] 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.

[0039] 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.

[0040] 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.

[0041] 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.

[0042] In this application, "central axis" refers to a line that passes through the geometric center of the corresponding structure.

[0043] 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.

[0044] A single-mode resonator supports only one resonant mode within its passband (e.g., TE (Transverse Electric) mode, TM (Transverse Magnetic) mode, TEM (Transverse Electric and Magnetic Field) mode, etc.). For example, a metallic coaxial resonator is a single-mode resonator, supporting only the TEM mode within its passband.

[0045] A dual-mode resonator is a resonator capable of simultaneously generating two stable oscillation signals at different frequencies. A dual-mode resonator supports two resonance modes within its passband. Currently, the most common dual-mode resonator is the HE dual-mode resonator, which utilizes two orthogonal modes: HE (Hybrid Electromagnetic Mode).

[0046] However, with the rapid development of microwave wireless communication technology, frequency band resources are becoming increasingly scarce. This phenomenon places unprecedented demands on the performance and size design of resonators. Therefore, related industries urgently need to conduct in-depth research and development of multimode resonators to meet the requirements of high performance and miniaturization.

[0047] Therefore, this application provides a four-mode resonator that can couple four resonance modes—TE mode, TM mode, and HE dual mode—in a single cavity, achieving a fourth-order filtering effect and improving resonator performance. Furthermore, the four-mode resonator achieves four modes without significantly increasing the size of the dielectric resonator, which is beneficial for miniaturizing the overall size of the resonator and can meet the requirements of both high performance and miniaturization.

[0048] The specific implementation of this application will be described in detail below with reference to specific embodiments:

[0049] Please see Figure 1 , Figure 2 , Figure 3 , Figure 4 Some embodiments of this application provide a four-mode resonator, including a resonator housing 10 and a dielectric resonator 20. The resonator housing 10 has a grounding component 11. The dielectric resonator 20 is disposed inside the resonator housing 10, and one end of the dielectric resonator 20 is connected to the grounding component 11. The dielectric resonator 20 has an annular recess 21, which is continuously or intermittently arranged in a ring shape. The central axis of the annular recess 21 coincides with the central axis L of the dielectric resonator 20. The bottom of the annular recess 21 is closed. The grounding component 11 closes the opening of the annular recess 21 so that the resonant frequency of the HE dual mode is in the same frequency band as the resonant frequency of the TE mode and the resonant frequency of the TM mode.

[0050] It should be noted that the resonator housing 10 has a resonant cavity 13 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 resonant cavity 13 can accommodate the dielectric resonator 20. Optionally, the dielectric resonator 20 can be centrally arranged within the resonant cavity 13. The resonator housing 10 can provide shielding to prevent signal leakage.

[0051] The resonator housing 10 has a grounding component 11. The grounding component 11 can be any wall portion of the resonator housing 10, or it can be a structural member (e.g., a base) connected to the wall portion of the resonator housing 10. This structural member can be directly connected (whether integrally connected or separately connected) to the wall portion of the resonator housing 10 to achieve grounding, or it can be indirectly connected to the wall portion of the resonator housing 10 via other conductive components to achieve grounding. The grounding component 11 is entirely made of metal, or its surface is covered with a metal layer (the portion of the grounding component 11 located within the metal layer can be made of a non-metallic material).

[0052] The wall of the resonator housing 10 that is spaced apart from the grounding component 11 is called the first wall 12. In practical applications, the resonator housing 10 can be placed with the first wall 12 facing upwards, or with the first wall 12 facing left, right, forward, or backward. Furthermore, the shape, size, and material of the resonator housing 10 can be flexibly set as needed.

[0053] It should also be noted that the dielectric resonator 20 is a resonant rod made of dielectric material. The dielectric resonator 20 can be a ceramic dielectric resonator 20 or a dielectric resonator 20 made of other materials.

[0054] One end of the dielectric resonator 20 along its axial direction is connected to the grounding component 11. The other end of the dielectric resonator 20 along its axial direction (i.e., the end of the dielectric resonator 20 closer to the first wall 12) is spaced apart from the first wall 12. The dielectric resonator 20 may be directly connected and fixed to the grounding component 11 by means of, but not limited to, welding, bonding, riveting, pressing, plugging, screw fastening, threaded connection, snap-fit, etc., or may be indirectly connected and fixed to the grounding component 11 by other structures connected to it (such as ceramic base, coupling rib, metal connector, etc.).

[0055] The dielectric resonator 20 can be, but is 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 is not limited to, circular, square, rectangular, polygonal, petal-shaped, cross-shaped, etc. The cross-sectional shape of the dielectric resonator 20 parallel to its axial direction can also be, but is not limited to, circular, square, rectangular, polygonal, petal-shaped, cross-shaped, etc. A central hole may or may not be provided at the central axis L of the dielectric resonator 20.

[0056] Wherein, the thickness direction of the first wall 12 is the first direction y. When the dielectric resonator 20 is installed on the resonator housing 10, the central axis L of the dielectric resonator 20 is parallel to or approximately parallel to the first direction y, that is, the axial direction of the dielectric resonator 20 is parallel to or approximately parallel to the first direction y.

[0057] It should also be noted that the dielectric resonator 20 has two end faces, which are opposite to each other along the axial direction of the dielectric resonator 20.

[0058] The annular recess 21 can be continuous or discontinuous in its overall circumference, and the central axis (i.e., the surrounding axis) of the annular recess 21 coincides with the central axis L of the dielectric resonator 20. For example... Figure 3 As shown, in some embodiments, the annular recess 21 can be a complete and continuous annular structure, such as an annular groove 214. Figure 4 As shown, in other embodiments, the annular recess 21 can also be a discontinuous, overall annular structure formed by multiple parts. For example, multiple arc-shaped grooves 215 can surround an axis and jointly form the annular recess 21; multiple blind holes can surround an axis and jointly form the annular recess 21; or multiple straight grooves can surround an axis and jointly form the annular recess 21. The bottom of the annular recess 21 is closed, that is, the annular recess 21 does not include a through-hole structure. The annular recess 21 can be provided on any end face, periphery, or outer peripheral surface of the dielectric resonator 20.

[0059] The grounding component 11 closes the notch of the annular recess 21, so that the grounding component 11 and the annular recess 21 can enclose at least one closed air cavity. Figure 7 As shown, the electric field path of the HE dual-mode in the air cavity is vertically distributed and has no substantial transmission effect. Most of the electric field path of the HE dual-mode needs to bend around the air cavity and has substantial transmission effect. Based on this, the electric field path of the HE dual-mode can be lengthened, the resonant frequency of the HE dual-mode can be lowered, and the resonant frequency of the HE dual-mode can be made closer to the resonant frequency of the TE mode and the resonant frequency of the TM mode. This can make the resonant frequencies of the HE dual-mode, the TE mode, and the TM mode all within the passband and close to the same frequency band.

[0060] And, as Figure 5 As shown, because the electric field of the TE mode is distributed in a horizontal (i.e., perpendicular to the first direction y) ring shape and the magnetic field is distributed in a vertical (i.e., parallel to the first direction y) ring shape, the electric field of the TE mode will be concentrated around the periphery of the dielectric resonator 20. Figure 6As shown, since the magnetic field of the TM mode is distributed in a horizontal ring and the electric field is distributed in a vertical ring, the electric field of the TM mode will be concentrated at the central axis L of the dielectric resonator 20. Therefore, based on the annular recess 21, the dielectric resonator 20 can be locally thinned, especially the thickness of the part of the dielectric resonator 20 corresponding to the annular recess 21 along its axial direction can be reduced, and the size of the part of the dielectric resonator 20 corresponding to the annular recess 21 along its radial direction can also be reduced accordingly. Based on this, the resonant frequency of the TE mode can be increased, and the resonant frequency of the TE mode can be finely increased by precisely designing the specific structure of the annular recess 21 (e.g., annular groove 214, multiple arc grooves 215, multiple blind holes, multiple straight grooves, etc.), dimensions (e.g., depth, width, length, etc.), and position, thereby making the resonant frequency of the TE mode close to the resonant frequency of the TM mode, close to the same frequency band, and within the passband. The more blind holes and grooves included in the annular recess 21, the higher the resonant frequency of the TE mode; the deeper the depth of each part of the annular recess 21, the higher the resonant frequency of the TE mode; the wider the width of each part of the annular recess 21, the higher the resonant frequency of the TE mode; the longer the extension path of the annular recess 21, the higher the resonant frequency of the TE mode; the closer the position of the annular recess 21 is to the outer peripheral surface of the dielectric resonator 20, the higher the resonant frequency of the TE mode; and so on.

[0061] Wherein, when the annular recess 21 is a complete and continuous annular groove 214, the notch of the annular recess 21 is the groove opening of the annular groove 214. When the annular recess 21 is a discontinuous structure formed by multiple parts and is annular in shape as a whole, the notch of the annular recess 21 includes the openings of each part. For example, the notch of the annular recess 21 includes the groove openings of each arc-shaped groove 215, or the notch of the annular recess 21 includes the openings of each blind hole, or the notch of the annular recess 21 includes the groove openings of each straight groove, and so on.

[0062] In this embodiment, the grounding component 11 only needs to close at least one annular recess 21 to make the resonant frequency of the HE dual-mode approach the resonant frequency of the TE mode and the resonant frequency of the TM mode. This ensures that the resonant frequencies of the HE dual-mode, TE mode, and TM mode are all within the passband and close to the same frequency band. Therefore, one or more annular recesses 21 can be provided. When multiple annular recesses 21 are provided, all the recesses of the annular recesses 21 are closed by the grounding component 11. The annular recesses 21 with their recesses closed by the grounding component 11 have the effect of both increasing the resonant frequency of the TE mode and decreasing the resonant frequency of the HE dual-mode. It should be noted that structures with recesses not closed by the grounding component 11, even if they are continuous or discontinuous annular in their overall circumference, are not considered "annular recesses 21" as defined in this embodiment, but can be considered "opening structures 22" (e.g., ...) in the following text. Figure 12 (as shown).

[0063] In summary, the four-mode resonator provided in this application embodiment can close the notch of the annular recess 21 through the grounding component 11, so that the grounding component 11 and the annular recess 21 can enclose at least one closed air cavity. This air cavity causes the electric field path of the HE dual-mode to be vertically distributed, and forces most, or even all, of the electric field path of the HE dual-mode to bend around the air cavity. This lengthens the electric field path of the HE dual-mode, lowers its resonant frequency, and brings it closer to the resonant frequencies of the TE and TM modes. Furthermore, it ensures that the resonant frequencies of the HE dual-mode, TE mode, and TM mode are all within the passband and close to the same frequency band. Therefore, the four-mode resonator can achieve four resonant modes—TE mode, TM mode, and HE dual-mode—coupled in a single cavity, achieving a fourth-order filtering effect equivalent to the filtering effect of four series-connected single-mode resonators. This optimizes and improves the performance and space utilization of the four-mode resonator. Furthermore, compared to existing multimode resonators, this quad-mode resonator only requires the addition of an annular recess 21 and the sealing of the annular recess 21 with a grounding component 11 on the basis of the TE-TM dual-mode resonator structure. The quad-mode resonator does not require a significant increase in the size of the dielectric resonator 20, which is conducive to the miniaturization of the overall size of the quad-mode resonator. This allows the quad-mode resonator to meet the requirements of both high performance and miniaturization.

[0064] Furthermore, by providing an annular recess 21 in the dielectric resonator 20, the dielectric resonator 20 is locally thinned, especially the thickness of the portion of the dielectric resonator 20 corresponding to the annular recess 21 along its axial and radial directions is reduced, thereby increasing the resonant frequency of the TE mode, making the resonant frequency of the TE mode closer to the resonant frequency of the TM mode, and making the resonant frequency of the TE mode and the resonant frequency of the TM mode within the passband and close to the same frequency band.

[0065] Furthermore, since the four-mode resonator has four resonance modes of single-cavity coupling: TE mode, TM mode, and HE dual mode, it is easy to establish a coupling relationship between the four-mode resonator and resonators with any of the TE, TM, HE, and TEM modes, and the coupling effect is better. Therefore, the four-mode resonator has better usability, applicability, and practicality.

[0066] Furthermore, in practical applications, this quad-mode resonator can shorten the electric field path of the HE dual-mode by leaving the grounding component 11 open across all the annular recesses 21. This allows the HE dual-mode electric field path to pass directly through the annular recesses 21, thus enabling all the annular recesses 21 to both "increase the resonant frequency of the TE mode" and "push the resonant frequency of the HE dual mode further away," extending the HE dual-mode resonant frequency beyond the passband. This allows the quad-mode resonator to be easily, quickly, and flexibly switched to a TE-TM dual-mode resonator, achieving single-cavity coupling of only the TE and TM modes, without coupling the HE dual mode. Therefore, the quad-mode resonator offers superior flexibility and ease of use.

[0067] like Figure 8 , Figure 9 As shown, in a specific application example, the four-mode resonator has four resonance modes: single-cavity coupled TE mode, TM mode, and HE dual mode. In this four-mode resonator, the resonant frequencies of HE dual mode, TE mode, and TM mode are close to 2.4 GHz. The Q value (Quality Factor) of HE dual mode is about 6400, the Q value of TE mode is about 9800, and the Q value of TM mode is about 7200.

[0068] Please see Figure 2 , Figure 3 In some embodiments of this application, at least one annular recess 21 is a first annular portion 211. The first annular portion 211 is formed on the end face of the dielectric resonator 20 facing the grounding component 11. The first annular portion 211 is disposed between the outer peripheral surface of the dielectric resonator 20 and the central axis L of the dielectric resonator 20.

[0069] It should be noted that the first annular portion 211 can be continuous or discontinuous in its overall circumferential direction. The first annular portion 211 is formed on the end face of the dielectric resonator 20 facing the grounding component 11, and the end of the first annular portion 211 away from the grounding component 11 is closed. The first annular portion 211 surrounds the outer peripheral surface of the dielectric resonator 20 and the central axis L of the dielectric resonator 20. Between the outer peripheral surface of the dielectric resonator 20 and the central axis L of the dielectric resonator 20, the first annular portion 211 can be precisely centered, or it can be offset towards the outer peripheral surface or the central axis L of the dielectric resonator 20. The outer peripheral surface of the dielectric resonator 20 is the circumferential surface connecting the two end faces of the dielectric resonator 20.

[0070] By adopting the above scheme, since the first annular portion 211 is opened on the end face of the dielectric resonator 20 facing the grounding component 11, and the end of the first annular portion 211 away from the grounding component 11 is closed, it is convenient for the grounding component 11 to directly close the notch of the first annular portion 211 on the end side of the dielectric resonator 20, thereby causing the resonant frequency of the HE dual-mode to be close to the resonant frequency of the TE mode and the resonant frequency of the TM mode. This facilitates the structural design and layout design of the grounding component 11, and makes it easier to design that "the resonant frequencies of the HE dual-mode, the TE mode, and the TM mode are all within the passband and close to the same frequency band".

[0071] Furthermore, when the annular recess 21 only includes the first annular portion 211, the grounding component 11 can be integrally disposed on the end side of the dielectric resonator 20 (e.g., in the form of a plate, block, column, etc.), without the need to provide other parts on the outer periphery of the dielectric resonator 20. This allows a larger portion of the dielectric resonator 20 to be exposed outside the grounding component 11, reducing the situation where the electromagnetic field on the outer periphery of the dielectric resonator 20 is shielded by the grounding component 11, and optimizing and improving the performance of the four-mode resonator.

[0072] Furthermore, by opening a first annular portion 211 on the end face of the dielectric resonator 20 facing the grounding component 11, and placing the first annular portion 211 between the outer peripheral surface of the dielectric resonator 20 and the central axis L of the dielectric resonator 20, the depth direction of the first annular portion 211 corresponds to the axial direction of the dielectric resonator 20. This facilitates the direct thinning of a specific area of ​​the dielectric resonator 20 along the axial direction of the dielectric resonator 20, thereby conveniently, controllably, and precisely increasing the resonant frequency of the TE mode.

[0073] Furthermore, since the electric field of the TE mode is concentrated around the periphery of the dielectric resonator 20, the annular recess 21 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 impact is minimal when it is located on the central axis of the dielectric resonator 20. By placing the first annular portion 211 between the outer peripheral surface of the dielectric resonator 20 and the central axis L of the dielectric resonator 20, the first annular portion 211 can avoid the outer peripheral surface of the dielectric resonator 20, thus preventing the resonant frequency of the TE mode from abruptly increasing due to excessive influence of the first annular portion 211 on the resonant frequency of the TE mode; at the same time, the first annular portion 211 also avoids the central axis L of the dielectric resonator 20, thus preventing the resonant frequency of the TE mode from failing to increase significantly due to insufficient influence of the first annular portion 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, and the resonant frequency of the TE mode can be controlled more precisely. At the same time, the electric field of the TM mode is more concentrated at the central axis L of the dielectric resonator 20. The first ring portion 211 avoids the central axis L of the dielectric resonator 20, which can also reduce the influence of the first ring portion 211 on the resonant frequency of the TM mode. This makes it easier to accurately design that "the resonant frequencies of the HE dual mode, the resonant frequencies of the TE mode, and the resonant frequencies of the TM mode are all within the passband and close to the same frequency band".

[0074] Furthermore, the first annular portion 211 is provided on the end face of the dielectric resonator 20 facing the grounding component 11, which facilitates mold design and allows the dielectric resonator 20 and its first annular portion 211 to be integrally formed by 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.

[0075] Please see Figure 10 , Figure 11 In some embodiments of this application, the grounding component 11 includes a grounding platform 111 disposed on the end side of the dielectric resonator 20, and a grounding ring 112 connected to the grounding platform 111 and surrounding the outer periphery of the dielectric resonator 20, with one end of the dielectric resonator 20 away from the grounding platform 111 protruding out of the grounding ring 112.

[0076] It should be noted that the grounding component 11 includes a grounding platform 111 and a grounding ring 112. The grounding platform 111 is the portion located on the end side of the dielectric resonator 20. The grounding ring 112 is the portion connected to the periphery of the grounding platform 111. The grounding ring 112 and the grounding platform 111 can enclose a groove-like receiving space. A portion of the dielectric resonator 20 is received within the receiving space enclosed by the grounding ring 112 and the grounding platform 111. The end of the dielectric resonator 20 away from the grounding platform 111 needs to protrude to the outside of the grounding ring 112. The grounding ring 112 and the grounding platform 111 can be integrally connected or separately connected. The grounding component 11 can close the notch of the annular recess 21 via at least one of the grounding platform 111 and the grounding ring 112.

[0077] By adopting the above scheme, the grounding component 11 can form a groove-like accommodating space by enclosing the grounding platform 111 and the grounding ring 112, thereby limiting and accommodating a portion of the dielectric resonator 20, thus achieving the limitation and positioning of the dielectric resonator 20. This allows for convenient, quick, and stable installation of the dielectric resonator 20, improving the assembly convenience and efficiency of the dielectric resonator 20, and increasing the assembly efficiency of the four-mode resonator. Furthermore, the end of the dielectric resonator 20 away from the grounding platform 111 protrudes from the grounding ring 112, ensuring that the grounding component 11 does not completely cover the dielectric resonator 20. This avoids the situation where the electromagnetic field around the dielectric resonator 20 is completely shielded by the grounding component 11, thus maintaining the performance of the four-mode resonator.

[0078] Of course, in other embodiments, the grounding component 11 may only include the grounding platform 111 disposed on the end side of the dielectric resonator 20, that is, the grounding component 11 may be disposed entirely on the end side of the dielectric resonator 20, and the grounding component 11 may be plate-shaped, block-shaped, column-shaped, etc. This embodiment is mainly applicable to the case where "the annular recess 21 only includes the first annular portion 211".

[0079] Please see Figure 10 In some embodiments of this application, at least one annular recess 21 is a second annular portion 212 formed on the periphery of the dielectric resonator 20, and the second annular portion 212 is connected to the outer peripheral surface of the dielectric resonator 20 and the end face of the dielectric resonator 20 facing the grounding platform 111.

[0080] It should be noted that the second annular portion 212 can be continuous or discontinuous along its circumference. The second annular portion 212 is formed around the periphery of the dielectric resonator 20, and simultaneously connects to both the outer peripheral surface of the dielectric resonator 20 and the end face of the dielectric resonator 20 facing the grounding platform 111. The side of the second annular portion 212 away from the grounding platform 111 is closed, i.e., it does not connect to the end face of the dielectric resonator 20 away from the grounding platform 111. The depth direction of the second annular portion 212 corresponds to both the radial and axial directions of the dielectric resonator 20.

[0081] By adopting the above scheme, by opening a second annular portion 212 around the periphery of the dielectric resonator 20 and connecting the second annular portion 212 to the outer peripheral surface of the dielectric resonator 20 and the end face of the dielectric resonator 20 facing the grounding platform 111, it is convenient for the grounding component 11 to close the notch connecting the second annular portion 212 to the end face of the dielectric resonator 20 via the grounding platform 111. It is also convenient for the grounding component 11 to close the notch connecting the second annular portion 212 to the outer peripheral surface of the dielectric resonator 20 via the grounding ring 112. This facilitates the structural design and layout design of the grounding component 11, and makes it convenient to design that "the resonant frequencies of the HE dual-mode, TE mode, and TM mode are all within the passband and close to the same frequency band". Furthermore, when the grounding ring 112 only needs to close the second annular portion 212, the height of the grounding ring 112 along the axial direction of the dielectric resonator 20 only needs to cover the notch connecting the second annular portion 212 to the outer peripheral surface of the dielectric resonator 20. It does not need to be set too high, thereby enabling a larger portion of the dielectric resonator 20 to be exposed outside the grounding ring 112. This reduces the shielding of the electromagnetic field on the outer periphery of the dielectric resonator 20 by the grounding ring 112 and maintains the performance of the four-mode resonator.

[0082] Furthermore, by opening a second annular portion 212 around the periphery of the dielectric resonator 20, and connecting the second annular portion 212 to the outer peripheral surface of the dielectric resonator 20 and the end face of the dielectric resonator 20 facing the grounding platform 111, the depth direction of the second annular portion 212 corresponds to the axial and radial directions of the dielectric resonator 20. This facilitates the thinning of specific areas of the dielectric resonator 20 along the axial and radial directions, thereby enabling convenient, controllable, and precise improvement of the resonant frequency of the TE mode.

[0083] Furthermore, since the electric field of the TE mode is concentrated around the periphery of the dielectric resonator 20, and the second annular portion 212 is located at the periphery of the dielectric resonator 20 and connects to the outer peripheral surface of the dielectric resonator 20, the second annular portion 212 has the greatest impact on the resonant frequency of the TE mode. Based on this, the resonant frequency of the TE mode can be significantly increased through the second annular portion 212, facilitating convenient and quick control of the resonant frequency of the TE mode, increasing the range of TE mode resonant frequency that can be increased, and making it easier to increase the resonant frequency of the TE mode to the required range. At the same time, since the electric field of the TM mode is concentrated at the central axis L of the dielectric resonator 20, based on the arrangement of this embodiment, the influence of the second annular portion 212 located at the periphery of the dielectric resonator 20 on the resonant frequency of the TM mode can be greatly reduced, enabling convenient and controllable increase of the resonant frequency of the TE mode while keeping the resonant frequency of the TM mode basically stable. This improves the ease and accuracy of adjusting the resonant frequency of the TE mode, and facilitates the precise design of "the resonant frequencies of the HE dual mode, the TE mode, and the TM mode are all within the passband and close to the same frequency band".

[0084] Furthermore, the second annular portion 212 is connected to the end face of the dielectric resonator 20 facing the grounding platform 111, which facilitates mold design and allows the dielectric resonator 20 and its second annular portion 212 to be integrally formed by 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.

[0085] Please see Figure 11 In some embodiments of this application, at least one annular recess 21 is a third annular portion 213 formed on the outer peripheral surface of the dielectric resonator 20, and the third annular portion 213 is disposed between the two end faces of the dielectric resonator 20.

[0086] It should be noted that the third annular portion 213 may be continuous or discontinuous in its overall circumferential direction. The third annular portion 213 is formed on the outer peripheral surface of the dielectric resonator 20 and is located between two opposite end faces of the dielectric resonator 20 along the axial direction. That is, along the axial direction of the dielectric resonator 20, the third annular portion 213 is not connected to either end face of the dielectric resonator 20, and the third annular portion 213 is closed on both opposite sides of the dielectric resonator 20 along the axial direction.

[0087] By adopting the above scheme, by opening a third annular portion 213 on the outer peripheral surface of the dielectric resonator 20 and placing the third annular portion 213 between the two end faces of the dielectric resonator 20, it is convenient for the grounding component 11 to close the notch on the outer peripheral surface of the dielectric resonator 20 via the grounding ring 112, thereby facilitating the structural design and layout design of the grounding component 11, and making it convenient to design that "the resonant frequencies of the HE dual-mode, TE mode, and TM mode are all within the passband and close to the same frequency band".

[0088] Furthermore, by opening a third annular portion 213 on the outer peripheral surface of the dielectric resonator 20 and placing the third annular portion 213 between the two end faces of the dielectric resonator 20, the depth direction of the third annular portion 213 corresponds to the radial direction of the dielectric resonator 20. This facilitates the thinning of a specific area of ​​the dielectric resonator 20 along the radial direction of the dielectric resonator 20, thereby conveniently, controllably, and precisely increasing the resonant frequency of the TE mode.

[0089] Furthermore, since the electric field of the TE mode is concentrated around the periphery of the dielectric resonator 20, when the third annular portion 213 is located on the outer peripheral surface of the dielectric resonator 20, the third annular portion 213 has a significant impact on the resonant frequency of the TE mode. Therefore, the resonant frequency of the TE mode can be significantly increased through the third annular portion 213, facilitating convenient and quick control of the resonant frequency of the TE mode, increasing the range of possible increases in the resonant frequency of the TE mode, and making it easier to increase the resonant frequency of the TE mode to the required range. At the same time, since the electric field of the TM mode is concentrated at the central axis L of the dielectric resonator 20, based on the arrangement of this embodiment, the influence of the third annular portion 213 located on the outer peripheral surface of the dielectric resonator 20 on the resonant frequency of the TM mode can be reduced to a large extent, enabling convenient and controllable increase of the resonant frequency of the TE mode while keeping the resonant frequency of the TM mode basically stable. This improves the ease and accuracy of adjusting the resonant frequency of the TE mode, and facilitates the precise design of "the resonant frequencies of the HE dual mode, the TE mode, and the TM mode are all within the passband and close to the same frequency band".

[0090] In this application, the aforementioned embodiments concerning the "first annular portion 211," "second annular portion 212," and "third annular portion 213" can be implemented individually, in pairs, or all in combination. For example, in Figure 2 In the illustrated embodiment, the dielectric resonator 20 may only have the first annular portion 211; for example, in Figure 10 In the illustrated embodiment, the dielectric resonator 20 may simultaneously have a first annular portion 211 and a second annular portion 212; for example, in Figure 11In the embodiment shown, the dielectric resonator 20 may simultaneously have a first annular portion 211 and a third annular portion 213.

[0091] Please see Figure 10 , Figure 11 In some embodiments of this application, the embodiments of the second annular portion 212 and / or the embodiments of the third annular portion 213 are combined with the embodiments of the first annular portion 211. That is, the dielectric resonator 20 is provided with the first annular portion 211 and the second annular portion 212; or, the dielectric resonator 20 is provided with the first annular portion 211 and the third annular portion 213; or, the dielectric resonator 20 is provided with the first annular portion 211, the second annular portion 212, and the third annular portion 213.

[0092] By adopting the above scheme, the grounding component 11 can easily close the notch connecting the first annular portion 211 to the end face of the dielectric resonator 20 and the notch connecting the second annular portion 212 to the end face of the dielectric resonator 20 via the grounding platform 111. The grounding component 11 can also easily close the notch connecting the second annular portion 212 to the outer peripheral surface of the dielectric resonator 20 and the notch connecting the third annular portion 213 to the outer peripheral surface of the dielectric resonator 20 via the grounding ring 112. This facilitates the structural and layout design of the grounding component 11 and makes it easier to design that "the resonant frequencies of the HE dual-mode, TE mode, and TM mode are all within the passband and close to the same frequency band".

[0093] Furthermore, the resonant frequency of the TE mode can be significantly increased by the second ring portion 212 and / or the third ring portion 213, while the resonant frequency of the TE mode is increased slightly by the first ring portion 211. Based on this, more precise control of the resonant frequency of the TE mode can be achieved, building upon the principle of "facilitating convenient and quick adjustment of the resonant frequency of the TE mode, increasing the range of achievable TE mode resonant frequency, and more easily increasing the resonant frequency of the TE mode to the desired range." That is, the resonant frequency of the TE mode can be significantly increased to near the desired range by the second ring portion 212 and / or the third ring portion 213, and then precisely and slightly increased to the desired range by the first ring portion 211. In this way, the resonant frequency of the TE mode can be more precisely controlled. While significantly 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 facilitates the precise design of "the resonant frequencies of the HE dual mode, the resonant frequencies of the TE mode, and the resonant frequencies of the TM mode are all within the passband and close to the same frequency band".

[0094] Please see Figure 2 , Figure 3 In some embodiments of this application, at least one annular recess 21 is an annular groove 214.

[0095] By adopting the above scheme, since the annular groove 214 is a continuous ring along its circumference, when the groove opening of the annular groove 214 is closed by the grounding component 11, the annular groove 214 and the grounding component 11 can jointly enclose and form an annular air cavity with a complete and continuous extension path. This annular air cavity can more significantly further cause most, or even all, of the electric field paths of the HE dual-mode to bend around the air cavity and have a substantial transmission effect. It can significantly reduce the situation where the electric field of the HE dual-mode travels directly in a straight line from the discontinuity of the ring, thereby extending the electric field path of the HE dual-mode by a large extent. It can optimize the effect of lowering the resonant frequency of the HE dual-mode, and can significantly promote the resonant frequency of the HE dual-mode, the resonant frequency of the TE mode, and the resonant frequency of the TM mode to be within the passband and close to the same frequency band.

[0096] Of course, in other embodiments, at least one annular recess 21 may be intermittently arranged in a ring shape.

[0097] Please see Figure 12 In some embodiments of this application, the dielectric resonator 20 is provided with an opening structure 22, which is used to increase the resonant frequency of the TE mode.

[0098] It should be noted that any region of the dielectric resonator 20 can be provided with an opening structure 22 as needed (i.e., the number and position of the opening structures 22 can be flexibly set), so that part of the dielectric resonator 20 at the location of the opening structure 22 is hollowed out. The opening of the opening structure 22 is not closed by the grounding component 11, and the main function of the opening structure 22 is to increase the resonant frequency of the TE mode. Specifically, the opening structure 22 can be formed on the end face of the dielectric resonator 20 facing the grounding component 11, the end face of the dielectric resonator 20 facing the first wall 12, or the outer peripheral surface of the dielectric resonator 20.

[0099] The opening structure 22 may include at least one of an opening and a groove. An opening may be a blind hole or a through hole. An opening may be a circular hole, a rectangular hole, an oblong hole, an irregularly shaped hole, etc. A groove may be a straight groove, a curved groove, an arc groove, an annular groove 214, etc. The annular groove 214 may be cylindrical, conical, mesa, stepped, or other shapes.

[0100] Based on the opening structure 22, the dielectric resonator 20 can be locally thinned, especially the thickness of the portion of the dielectric resonator 20 corresponding to the opening structure 22 along its axial direction can be reduced or even reduced to zero. Correspondingly, the size of the portion of the dielectric resonator 20 corresponding to the opening structure 22 along its radial direction can also be reduced accordingly. Based on this, by precisely designing the shape (e.g., groove, hole), form (e.g., annular, circular, rectangular, elliptical), size (e.g., depth, width, length), and position of the opening structure 22, the resonant frequency of the TE mode can be precisely increased, thereby ensuring that the resonant frequencies of the HE dual mode, the TE mode, and the TM mode are all within the passband and close to the same frequency band.

[0101] By adopting the above scheme, the dielectric resonator 20 can be made to have an opening structure 22, thereby reducing the size of the portion of the dielectric resonator 20 corresponding to the opening structure 22 along its axial and radial directions, which can improve the resonant frequency of the TE mode. Based on this, the TE mode resonant frequency can be finely adjusted (improved) by precisely designing the shape, size, and position of the opening structure 22. This facilitates the design of "the resonant frequencies of the HE dual-mode, TE mode, and TM mode are all within the passband and close to the same frequency band," improving the design and manufacturing convenience of the dielectric resonator 20 and the four-mode resonator, and improving the performance of the four-mode resonator. Furthermore, the design of the opening structure 22 can also reduce the weight of the dielectric resonator 20, thereby reducing the weight of the four-mode resonator while optimizing performance, which is beneficial for the lightweight design of the four-mode resonator.

[0102] Of course, in other embodiments, the opening structure 22 may be omitted from the dielectric resonator 20, for example, the resonant frequency of the TE mode may be adjusted based solely on the annular recess 21.

[0103] Please see Figure 2 , Figure 3 In some embodiments of this application, the dielectric resonator 20 includes a dielectric body 23 with an annular recess 21 and a dielectric rod 24 disposed on the side of the dielectric body 23 facing the grounding component 11. The dielectric body 23 is connected to the grounding component 11 through the dielectric rod 24.

[0104] It should be noted that the dielectric body 23 is the main part of the dielectric resonator 20, and also the part of the dielectric resonator 20 used to influence and determine the resonant frequency of the TE mode. Since the electric field of the TE mode is distributed in a horizontal ring and the magnetic field is distributed in a vertical ring, the electric field of the TE mode will be concentrated in the center of the resonant cavity 13 and surround it in a ring. Therefore, the resonant frequency of the TE mode can be influenced and determined by the dielectric body 23, which is basically located in the center of the resonant cavity 13.

[0105] The dielectric body 23 has an annular recess 21. The resonant frequency of the TE mode can be adjusted not only by the shape, size, and position of the annular recess 21, but also by the radial dimension and thickness of the dielectric body 23. Specifically, a larger radial dimension of the dielectric body 23 results in a lower resonant frequency of the TE mode; a smaller radial dimension results in a higher resonant frequency. Similarly, a larger thickness of the dielectric body 23 results in a lower resonant frequency of the TE mode; a smaller thickness results in a higher resonant frequency.

[0106] The medium body 23 may be in the form of, but is not limited to, a disc, column, block, etc., and the cross-sectional shape of the medium body 23 perpendicular to its axis may be in the form of, but is not limited to, a circle, rectangle, square, polygon, petal, cross, etc.

[0107] In the case where the dielectric resonator 20 includes the dielectric body 23, the end face of the dielectric resonator 20 is the end face of the dielectric body 23, and the outer peripheral surface of the dielectric resonator 20 is the outer peripheral surface of the dielectric body 23.

[0108] It should also be noted that a dielectric rod 24 may be provided on the side of the dielectric body 23 facing the grounding component 11. The dielectric body 23 and the dielectric rod 24 may be connected integrally or separately.

[0109] The dielectric body 23 can be connected to the grounding component 11 via the dielectric rod 24. The dielectric rod 24 can be directly connected and fixed to the grounding component 11 by means of, but not limited to, welding, bonding, riveting, crimping, screw fastening, threaded connection, snap-fit, etc., or it can be indirectly connected and fixed to the grounding component 11 by other structures connected to it (such as base, alumina base, other ceramic base, coupling rib, metal connector, etc.). The dielectric rod 24 can be a round rod, a polygonal rod, an irregularly shaped rod, or other shapes, and the dielectric rod 24 can be a solid rod or a hollow rod.

[0110] By adopting the above scheme, the dielectric resonator 20 can influence and determine the resonant frequency of the TE mode through the dielectric body 23. In particular, the resonant frequency of the TE mode can be adjusted by adjusting the radial dimension and thickness of the dielectric body 23, and by adjusting the shape, size, and position of the annular recess 21 on the dielectric body 23. At the same time, the dielectric resonator 20 can lower and reduce the resonant frequency of the HE dual mode through the annular recess 21 on the dielectric body 23. This facilitates the design where the resonant frequencies of the HE dual mode, the TE mode, and the TM mode are all within the passband and close to the same frequency band, thus improving the design and fabrication convenience of the dielectric resonator 20 and the four-mode resonator, and improving the performance of the four-mode resonator.

[0111] By adopting the above scheme, the dielectric resonator 20 can also be equipped with a dielectric rod 24, so that the dielectric body 23 can be connected and fixed to the grounding component 11 via the dielectric rod 24. Based on this, the assembly convenience between the dielectric body 23 and the grounding component 11 can be improved, eliminating the need for an additional alumina base or other ceramic base between the dielectric body 23 and the grounding component 11, thereby reducing the number of parts and improving the assembly convenience and efficiency of the four-mode resonator.

[0112] Furthermore, since both the dielectric rod 24 and the dielectric body 23 are part of the dielectric resonator 20, it is easy to integrally mold the dielectric rod 24 and the dielectric body 23, which simplifies the assembly process between them. Additionally, the dielectric rod 24 and the dielectric body 23 can be made of the same material (e.g., microwave dielectric ceramic), which optimizes dielectric properties and thus improves the overall specifications and performance of the four-mode resonator.

[0113] Of course, in other embodiments, the dielectric resonator 20 may not have the dielectric rod 24, for example, it may only have the dielectric body 23, or it may have both the dielectric body 23 and the dielectric pillar 25 mentioned below.

[0114] Please see Figure 2 , Figure 3 In some embodiments of this application, the annular recess 21 is located on the outer periphery of the medium rod 24.

[0115] By adopting the above-described scheme, and by positioning the annular recess 21 on the outer periphery of the medium body 23, the annular recess 21 can be positioned away from the medium rod 24. Based on this, the positional arrangement of the annular recess 21 relative to the medium rod 24 can be optimized, facilitating the molding of the annular recess 21, simplifying mold design, and enabling the integral molding of the medium rod 24, the medium body 23, and the annular recess 21 via the mold. In particular, when the annular recess 21 connects to the end face of the medium body 23 near the medium rod 24, the dielectric resonator 20 can be demolded along its axial direction, optimizing and improving the demolding convenience of the mold after the dielectric resonator 20 is formed. This improves the molding convenience and accuracy of the dielectric resonator 20, and reduces mold costs and the processing costs of the dielectric resonator 20. Furthermore, the annular recess 21 is located on the outer periphery of the dielectric rod 24, so that the grounding component 11 can simultaneously seal the recess of the annular recess 21 while the dielectric rod 24 is installed to the grounding component 11, making the sealing process of the recess of the annular recess 21 by the grounding component 11 more convenient and faster.

[0116] Please see Figure 2 In some embodiments of this application, the grounding component 11 is provided with a positioning groove 113, and the dielectric rod 24 is inserted into the positioning groove 113.

[0117] It should be noted that the grounding component 11 can be any wall of the resonator housing 10, or it can be a structural component (such as a base) that is grounded to the wall of the resonator housing 10. The grounding component 11 has a positioning groove 113 on the side facing the dielectric resonator 20. The shape, size and depth of the positioning groove 113 can be set as needed.

[0118] The dielectric rod 24 of the dielectric resonator 20 can be positioned and limited in the positioning groove 113 for convenient, quick and stable installation on the grounding component 11, thereby achieving connection and fixation to the grounding component 11. In some embodiments, when the dielectric rod 24 is inserted in the positioning groove 113, the dielectric rod 24 can be completely fixed to the grounding component 11 by welding or other means.

[0119] It should also be noted that, since the magnetic field of the TM mode is distributed in a horizontal ring and the electric field is distributed in a vertical ring, the electric field of the TM mode will be concentrated between the dielectric resonator 20 and the first wall 12. Therefore, if the grounding component 11 is a base or other structure that can raise the dielectric resonator 20, the grounding component 11 can also be used to raise the resonant position of the TM mode.

[0120] By adopting the above scheme, the dielectric rod 24 of the dielectric resonator 20 can be positioned and limited in the positioning groove 113, thus facilitating and quickly stabilizing the installation of the dielectric resonator 20. This improves the assembly convenience and efficiency of the dielectric resonator 20, and enhances the assembly efficiency of the four-mode resonator. Furthermore, the positioning groove 113 on the grounding component 11 provides a precise installation position for the dielectric resonator 20, ensuring accurate positioning of the dielectric resonator 20 within the resonator housing 10. This reduces performance fluctuations caused by inaccurate installation of the dielectric resonator 20, improving the stability and consistency of the four-mode resonator's performance.

[0121] Furthermore, based on the assembly method of "the dielectric rod 24 is inserted into the positioning groove 113", there is no need to use screws to fix the dielectric resonator 20. The dielectric resonator 20 does not need to be provided with a central hole through its axis for screws to pass through. This can basically avoid the setting of the central hole from having a significant impact on the resonant frequency of the TM mode. It can reduce the situation where the resonant frequency of the TM mode and the resonant frequency of the TE mode are difficult to control due to the significant increase of the resonant frequency of the TM mode caused by the setting of the central hole.

[0122] Of course, in other embodiments, the positioning groove 113 can be omitted, and the medium rod 24 can be directly connected to the corresponding side of the grounding component 11.

[0123] Please see Figure 2In some embodiments of this application, the dielectric resonator 20 includes a dielectric body 23 with an annular recess 21 and a dielectric post 25 disposed on the side of the dielectric body 23 away from the grounding component 11. The dielectric post 25 is spaced apart from the corresponding wall (i.e., the first wall 12) of the resonator housing 10.

[0124] The dielectric body 23 is connected to the grounding component 11 on the side facing the grounding component 11. The dielectric body 23 can be directly connected and fixed to the grounding component 11 by means of, but not limited to, welding, bonding, riveting, crimping, plugging, screw fastening, threaded connection, snap-fit, etc., or it can be indirectly connected and fixed to the grounding component 11 by other structures connected to it (such as dielectric rod 24, base, alumina base, other ceramic base, coupling rib, metal connector, etc.).

[0125] It should be noted that the dielectric pillar 25 protrudes from the side of the dielectric body 23 facing the first wall 12. The central axis of the dielectric pillar 25 can coincide with the central axis of the dielectric body 23, or it can be arranged parallel to it and spaced apart. There can be one or more dielectric pillars 25. The dielectric body 23 and the dielectric pillar 25 can be connected integrally or separately. The end face of the dielectric pillar 25 away from the dielectric body 23 is spaced apart from the first wall 12. The dielectric pillar 25 is the part of the dielectric resonator 20 used to influence and determine the resonant frequency of the TM mode. Since the magnetic field of the TM mode is distributed in a horizontal ring and the electric field is distributed in a vertical ring, the electric field of the TM mode will be concentrated between the dielectric resonator 20 and the first wall 12. Therefore, the resonant frequency of the TM mode can be influenced and determined by the dielectric pillar 25 protruding from the side of the dielectric body 23 facing the first wall 12. The cross-sectional shape of the dielectric pillar 25 perpendicular to its axis can be, but is not limited to, circular, rectangular, polygonal, petal-shaped, cross-shaped, etc.

[0126] Specifically, the resonant frequency of the TM mode can be adjusted by changing the number of dielectric pillars 25, their position, their radial dimension, and the distance between the dielectric pillars 25 and the first wall 12. A greater number of dielectric pillars 25 results in a lower resonant frequency, while fewer pillars result in a higher frequency. The closer the dielectric pillars 25 are to the central axis of the dielectric body 23, the lower the resonant frequency; the further away they are from the central axis, the higher the frequency. A larger radial dimension results in a lower frequency, while a smaller dimension results in a higher frequency. A smaller distance between the dielectric pillars 25 and the first wall 12 (i.e., closer the pillars are to the wall) results in a lower frequency, while a larger distance (i.e., further away) results in a higher frequency.

[0127] In some embodiments, the radial dimension of the dielectric pillar 25 is smaller than the radial dimension of the dielectric body 23. Of course, in other embodiments, when the resonant frequency of the TE mode and the resonant frequency of the TM mode are close to the same frequency band, the radial dimension of the dielectric pillar 25 and the radial dimension of the dielectric body 23 can be set to be equal.

[0128] By adopting the above scheme, the dielectric resonator 20 can lower and reduce the resonant frequency of the HE dual mode through the annular recess 21 on the dielectric body 23. The dielectric resonator 20 can influence and determine the resonant frequency of the TE mode through the dielectric body 23, and can influence and determine the resonant frequency of the TM mode through the dielectric pillar 25 protruding from the dielectric body 23 towards the first wall 12. Based on this, the resonant frequency of the TE mode can be adjusted by adjusting the radial dimension and thickness of the dielectric body 23, and by adjusting the shape, size, and position of the annular recess 21 on the dielectric body 23; the resonant frequency of the TM mode can be adjusted by adjusting the number of dielectric pillars 25, the position of the dielectric pillars 25, the radial dimension of the dielectric pillars 25, and the distance between the dielectric pillars 25 and the first wall 12; the resonant frequency of the HE dual mode can be lowered by the annular recess 21 on the dielectric body 23; thus facilitating the design of "the resonant frequencies of the HE dual mode, the TE mode, and the TM mode are all within the passband and close to the same frequency band", which improves the design and processing convenience of the dielectric resonator 20 and the four-mode resonator, and improves the performance of the four-mode resonator.

[0129] Of course, in other embodiments, the dielectric resonator 20 may not have the dielectric pillar 25 provided, for example, only the dielectric body 23 is provided, or the dielectric body 23 and the dielectric rod 24 mentioned above are provided.

[0130] Please see Figure 2 , Figure 3 In some embodiments of this application, the dielectric resonator 20 is a rotationally symmetric structure.

[0131] It should be noted that the dielectric resonator 20 has a rotationally symmetric structure around its central axis, and the annular recess 21 also has a rotationally symmetric structure around the central axis L of the dielectric resonator 20.

[0132] In the case where the dielectric resonator 20 includes a dielectric body 23, the dielectric body 23 has a rotationally symmetric structure around the central axis L of the dielectric resonator 20.

[0133] In the case where the dielectric resonator 20 includes a dielectric rod 24, the dielectric rod 24 has a rotationally symmetric structure around the central axis L of the dielectric resonator 20.

[0134] When the dielectric resonator 20 includes a single dielectric pillar 25, the dielectric pillar 25 is rotationally symmetric about the central axis L of the dielectric resonator 20. When the dielectric resonator 20 includes multiple dielectric pillars 25, the multiple dielectric pillars 25 are rotationally symmetric about the central axis L of the dielectric resonator 20.

[0135] like Figure 12 As shown, when the dielectric resonator 20 is provided with an opening structure 22, the opening structure 22 is also rotationally symmetric around the central axis L of the dielectric resonator 20.

[0136] By adopting the above scheme and making the dielectric resonator 20 a rotationally symmetric structure, the structure and electromagnetic field distribution of the dielectric resonator 20 are essentially the same in different directions around the central axis L of the dielectric resonator 20, and thus lack directionality. Based on this, the dielectric resonator 20 can be assembled directly and quickly into the resonator housing 10 without considering assembly angle and limiting issues, thereby improving the assembly convenience and efficiency of the dielectric resonator 20 and increasing the assembly efficiency of the four-mode resonator. Furthermore, it reduces performance fluctuations caused by inaccurate assembly angles of the dielectric resonator 20, improving the stability and consistency of the four-mode resonator's performance.

[0137] This embodiment is particularly suitable for use in conjunction with the embodiment related to "positioning groove 113", so that the dielectric resonator 20 can be directly inserted into the positioning groove 113 without considering the assembly angle, and can be installed and fixed easily and quickly.

[0138] Of course, in other embodiments, the dielectric resonator 20 may be a non-rotationally symmetric structure.

[0139] Please see Figure 1 , Figure 2 In some embodiments of this application, the four-mode resonator includes an adjusting screw 30, which is threadedly connected to the resonator housing 10 and is used to adjust the resonant frequency of the TM mode.

[0140] It should be noted that the number of adjusting screws 30 can be one or more. The adjusting screw 30 can be threaded onto any wall portion of the resonator housing 10. The adjusting screw 30 can be directly threaded onto a threaded hole in the corresponding wall portion; alternatively, a mounting component (not shown in the figure) can be embedded in the corresponding wall portion, and the adjusting screw 30 can be threaded onto the threaded hole of this mounting component. The adjusting screw 30 is grounded based on its connection to the resonator housing 10.

[0141] The installation position of the adjusting screw 30 is not limited. Along the axial direction of the dielectric resonator 20, the adjusting screw 30 and the dielectric resonator 20 can be aligned or misaligned.

[0142] By adopting the above scheme, the length of the portion of the adjusting screw 30 extending into the resonator housing 10 can be conveniently and quickly adjusted by screwing it in or out. Based on this, the electric field of the TM mode can be affected by adjusting the length of the portion of the adjusting screw 30 extending into the resonator housing 10, thereby achieving independent and precise adjustment of the resonant frequency of the TM mode. Tuning is convenient, quick, and accurate. In this embodiment, the resonant frequency of the TM mode can be independently tuned via the grounded adjusting screw 30, with minimal impact on the resonant frequency of the TE mode and the resonant frequency of the HE dual mode. Specifically, the longer the portion of the adjusting screw 30 extending into the resonator housing 10, the lower the resonant frequency of the TM mode; conversely, the shorter the portion of the adjusting screw 30 extending into the resonator housing 10, the higher the resonant frequency of the TM mode.

[0143] In some embodiments, the adjusting screw 30 is threadedly connected to the first wall 12. This configuration optimizes the tuning effect of the adjusting screw 30 on the resonant frequency of the TM mode and expands the tuning range of the TM mode's resonant frequency. In particular, the tuning effect of the adjusting screw 30 on the resonant frequency of the TM mode is optimal when the adjusting screw 30 is threadedly connected to the first wall 12 and the adjusting screw 30 and the dielectric resonator 20 are aligned along the axial direction of the dielectric resonator 20.

[0144] Please see Figure 1 Some embodiments of this application provide a filter, including a four-mode resonator provided in the embodiments of this application. The filter may have one or more resonators, and the multiple resonators can be arranged in a specific configuration, with coupling relationships established between adjacent resonators as needed. At least one of the resonators employs the four-mode resonator provided in the embodiments of this application.

[0145] By adopting the above scheme, the filter can use the four-mode resonator provided in the embodiments of this application, which facilitates simulation design and coupling design, optimizes the coupling effect between resonators, improves the performance of the filter, and facilitates the miniaturization of the filter.

[0146] 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 four-mode resonator, characterized in that, include: The resonator housing has a grounding component; A dielectric resonator is disposed within the resonator housing. One end of the dielectric resonator is connected to the grounding component. The dielectric resonator has an annular recess that is continuously or intermittently arranged in a ring shape. The central axis of the annular recess coincides with the central axis of the dielectric resonator. The bottom of the annular recess is closed. The grounding component closes the opening of the annular recess so that the resonant frequency of the HE dual-mode is in the same frequency band as the resonant frequencies of the TE mode and the TM mode.

2. The four-mode resonator as described in claim 1, characterized in that, At least one of the annular recesses is a first annular portion, which is formed on the end face of the dielectric resonator facing the grounding component, and is located between the outer peripheral surface of the dielectric resonator and the central axis of the dielectric resonator.

3. The four-mode resonator as described in claim 1, characterized in that, The grounding component includes a grounding platform disposed on the end side of the dielectric resonator, and a grounding ring connected to the grounding platform and surrounding the outer periphery of the dielectric resonator, wherein the end of the dielectric resonator away from the grounding platform protrudes from the grounding ring.

4. The four-mode resonator as described in claim 3, characterized in that, At least one of the annular recesses is a second annular portion formed on the periphery of the dielectric resonator, the second annular portion being connected to the outer peripheral surface of the dielectric resonator and the end face of the dielectric resonator facing the grounding platform; And / or, at least one of the annular recesses is a third annular portion formed on the outer peripheral surface of the dielectric resonator, the third annular portion being disposed between the two end faces of the dielectric resonator.

5. The four-mode resonator as described in claim 1, characterized in that, At least one of the annular recesses is an annular groove.

6. The four-mode resonator as described in any one of claims 1-5, characterized in that, The dielectric resonator has an opening structure, which is used to increase the resonant frequency of the TE mode.

7. The four-mode resonator as described in any one of claims 1-5, characterized in that, The dielectric resonator includes a dielectric body with the annular recess and a dielectric rod disposed on the side of the dielectric body facing the grounding component. The dielectric body is connected to the grounding component through the dielectric rod.

8. The four-mode resonator as described in claim 7, characterized in that, The annular recess is located on the outer periphery of the medium rod.

9. The four-mode resonator as described in claim 7, characterized in that, The grounding component is provided with a positioning groove, and the dielectric rod is inserted into the positioning groove.

10. The four-mode resonator as described in any one of claims 1-5, characterized in that, The dielectric resonator includes a dielectric body with the annular recess and a dielectric post on the side of the dielectric body away from the grounding component, the dielectric post being spaced apart from the corresponding wall of the resonator housing.

11. The four-mode resonator as described in any one of claims 1-5, characterized in that, The dielectric resonator has a rotationally symmetric structure.

12. A filter, characterized in that, Includes a four-mode resonator as described in any one of claims 1-11.

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