Dielectric cavity resonator and filter

Abstract

Provided in the present application are a dielectric cavity resonator and a filter. The dielectric cavity resonator comprises a resonator housing (10) and a dielectric resonant member (20), wherein the resonator housing (10) has a first plate member (11) and a second plate member (12); and the dielectric resonant member (20) comprises a dielectric main body (21) connected to the first plate member (11), and a dielectric post (22) protruding from the side of the dielectric main body (21) facing the second plate member (12), the dielectric post (22) being spaced apart from the second plate member (12), the dielectric main body (21) being configured to determine the resonant frequency of a TE mode, and the dielectric column (22) being configured to determine the resonant frequency of a TM mode, such that the resonant frequency of the TE mode and the resonant frequency of the TM mode are within the same frequency band. The dielectric cavity resonator can couple at least two resonant modes, i.e., a TE mode and a TM mode, in a single cavity, thereby facilitating the establishment of a coupling relationship with resonators such as a metal coaxial resonator, and achieving a relatively good coupling effect.

Description

Dielectric cavity resonator and filter

[0001] This application claims priority to the Chinese Patent Application No. 202411369581.6, filed on September 27, 2024, and entitled "Dielectric cavity resonator and filter", the content of which is incorporated herein by reference in its entirety. This application also claims priority to the Chinese Patent Application No. 202411369552.X, filed on September 27, 2024, and entitled "Four-mode resonator and filter", the content of which is incorporated herein by reference in its entirety. TECHNICAL FIELD

[0002] The present application belongs to the field of communication technology, and particularly relates to a dielectric cavity resonator and filter. BACKGROUND

[0003] A dual-mode resonator is a resonator capable of simultaneously generating two frequency-stable oscillation signals. The dual-mode resonator can support two resonant modes within its passband range. The commonly used dual-mode resonator is an HE dual-mode resonator. However, the HE dual-mode resonator utilizes HE (Hybrid Electromagnetic Mode) two orthogonal modes, and the coupling of the HE mode with TEM (Transverse Electric and Magnetic Field) mode and other modes is difficult, resulting in that the coupling of the HE dual-mode resonator with resonators such as metal coaxial resonators is difficult to build and the coupling effect is poor, which causes poor usability and applicability of the HE dual-mode resonator.

[0004] SUMMARY

[0005] Embodiments of the present application provide a dielectric cavity resonator and filter, aiming to solve the problem that the coupling of the existing dual-mode resonator with resonators such as metal coaxial resonators is difficult to build and the coupling effect is poor, resulting in poor usability and applicability of the existing dual-mode resonator.

[0006] To achieve the above object, the technical solutions adopted by the embodiments of the present application are as follows:

[0007] In a first aspect, a dielectric cavity resonator is provided, comprising:

[0008] a resonator shell having a first plate member and a second plate member arranged opposite to each other;

[0009] The medium resonant piece is arranged in the resonator shell, and the medium resonant piece comprises a medium main body connected to the first plate piece and a medium column protruding from a side of the medium main body facing the second plate piece, the medium column is arranged in a spaced manner with the second plate piece, the medium main body is used to determine the resonant frequency of the TE mode, and the medium column is used to determine the resonant frequency of the TM mode, so that the resonant frequency of the TE mode and the resonant frequency of the TM mode are in the same frequency band.

[0010] In a second aspect, a filter is provided, comprising the medium cavity resonator provided in the embodiments of the present application.

[0011] The medium cavity resonator provided in the present application has the following beneficial effects:

[0012] The medium cavity resonator provided in the embodiments of the present application can affect and determine the resonant frequency of the TE mode through the medium main body of the medium resonant piece. The resonant frequency of the TM mode can be affected and determined through the medium column protruding from the side of the medium main body facing the second plate piece. Based on this, the resonant frequency of the TE mode can be adjusted by adjusting the radial size and thickness of the medium main body, and the resonant frequency of the TM mode can be adjusted by adjusting the number of the medium columns, the position of the medium columns, the radial size of the medium columns, and the spacing between the medium columns and the second plate piece. In this way, the resonant frequency of the TE mode and the resonant frequency of the TM mode are close to each other, and the resonant frequency of the TE mode and the resonant frequency of the TM mode are in the passband range and close to the same frequency band. Thus, the medium cavity resonator can couple at least two orthogonal resonant modes of high Q (Quality Factor) values of the TE mode and the TM mode, and can be coupled with the resonator such as the metal coaxial resonator based on the TE mode and the TM mode, so that the use, applicability and practicability of the medium cavity resonator are better. BRIEF DESCRIPTION OF DRAWINGS

[0013] In order to clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the embodiments or prior art description will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor.

[0014] Fig. 1 is a perspective view of the medium cavity resonator provided in some embodiments of the present application;

[0015] Fig. 2 is a sectional view of the medium cavity resonator provided in Fig. 1;

[0016] Fig. 3 is a perspective sectional view of the medium resonant piece provided in Fig. 2;

[0017] Figure 4 is a diagram of an electric field distribution of a TE mode of the dielectric cavity resonator according to some embodiments of the present application;

[0018] Figure 5 is a diagram of an electric field distribution of a TM mode of the dielectric cavity resonator according to some embodiments of the present application;

[0019] Figure 6 is a diagram of a frequency simulation of the dielectric cavity resonator according to Figure 2, wherein the dielectric cavity resonator is a TE-TM dual mode resonator, the a-line represents a TE mode, and the b-line represents a TM mode, the resonant frequency of the TE mode and the resonant frequency of the TM mode are close to 2.6 GHz;

[0020] Figure 7 is a diagram of a Q value simulation of the dielectric cavity resonator according to Figure 2, wherein the dielectric cavity resonator is a TE-TM dual mode resonator, the a-line represents a TE mode, and the b-line represents a TM mode, the Q value of the TM mode is about 8700, and the Q value of the TE mode is about 14000;

[0021] Figure 8 is a diagram of a cross section of a dielectric cavity resonator according to some other embodiments of the present application, wherein the recess comprises a second recess;

[0022] Figure 9 is a diagram of a cross section of a dielectric cavity resonator according to some other embodiments of the present application, wherein the recess comprises a third recess;

[0023] Figure 10 is a diagram of a cross section of a dielectric cavity resonator according to some other embodiments of the present application, wherein the grounding member closes the notch of the annular recess, 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;

[0024] Figure 11 is a diagram of an electric field distribution of the HE dual mode of the dielectric cavity resonator according to Figure 10;

[0025] Figure 12 is a diagram of a frequency simulation of the dielectric cavity resonator according to Figure 10, wherein the dielectric cavity resonator is a four-mode resonator, the a-line represents a TM mode, the b-line represents a TE mode, the c-line and the d-line represent an HE dual mode, the resonant frequency of the HE dual mode, the resonant frequency of the TE mode and the resonant frequency of the TM mode are close to 2.4 GHz;

[0026] Figure 13 is a diagram of a Q value simulation of the dielectric cavity resonator according to Figure 10, wherein the dielectric cavity resonator is a four-mode resonator, the a-line represents a TM mode, the b-line represents a TE mode, the c-line and the d-line represent an 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;

[0027] Figure 14 is a diagram of a cross section of a dielectric cavity resonator according to some other embodiments of the present application, wherein the dielectric body is provided with a first annular portion and a second annular portion;

[0028] Fig. 15 is a sectional view of a dielectric cavity resonator according to some embodiments of the present application, wherein the dielectric body is provided with a first annular portion and a third annular portion;

[0029] Fig. 16 is a sectional view of a dielectric cavity resonator according to some embodiments of the present application, wherein the dielectric cavity resonator comprises a metal disc and an insulating member.

[0030] In the drawings:

[0031] 10 - resonator housing, 11 - first plate member, 12 - second plate member, 13 - resonant cavity, 14 - base, 141 - positioning groove, 15 - grounding member, 151 - grounding base, 152 - grounding ring; 20 - dielectric resonator member, 21 - dielectric body, 211 - recess, 2111 - first recess, 2112 - second recess, 2113 - third recess, 2114 - annular recess, 2114a - first annular portion, 2114b - second annular portion, 2114c - third annular portion, 22 - dielectric post, 23 - dielectric rod; 30 - metal disc, 40 - insulating member, 50 - adjusting screw, y - first direction, L - central axis of the dielectric body. DETAILED DESCRIPTION

[0032] In order to make the technical problems solved by the present application, the technical solutions and the beneficial effects clear, the present application will be described in detail below with reference to the drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and not used to limit the present application. If not specifically stated, all the embodiments and optional embodiments of the present application can be combined to form new technical solutions. If not specifically stated, all the technical features and optional technical features of the present application can be combined to form new technical solutions.

[0033] In the present application, the "central axis" refers to a line passing through the geometric center line of the corresponding structure. In the present application, the "axial direction" refers to the extension direction of the central axis of the corresponding structure, the "radial direction" refers to any direction of the corresponding structure passing through the central axis and perpendicular to the central axis, and the "circumferential direction" refers to the circumferential direction of the outer circumferential surface of the corresponding structure.

[0034] A single-mode resonator only supports one resonant mode (e.g. TE (Transverse Electric) mode, TM (Transverse Magnetic) mode, TEM (Transverse Electric and Magnetic Field) mode, etc.) within its passband range. For example, a metal coaxial resonator is a single-mode resonator, which only supports TEM mode within its passband range. A dual-mode resonator is a resonator capable of simultaneously generating two frequency-stable oscillation signals. A dual-mode resonator can support two resonant modes within its passband range. The common dual-mode resonator at present is an HE dual-mode resonator. However, the HE dual-mode resonator utilizes two orthogonal HE (Hybrid Electromagnetic Mode) modes, and it is difficult to couple the HE mode with TEM mode, TM mode, TE mode, etc. This leads to the difficulty in coupling the HE dual-mode resonator with other resonators such as a metal coaxial resonator, and the coupling effect is poor, resulting in poor usability and applicability of the HE dual-mode resonator.

[0035] Therefore, the embodiments of the present application provide a dielectric cavity resonator, which can couple at least two orthogonal resonant modes of TE mode and TM mode in a single cavity. The dielectric cavity resonator is convenient to establish a coupling relationship with other resonators such as a metal coaxial resonator, and the coupling effect is better. The dielectric cavity resonator has better usability, applicability and practicability.

[0036] The specific implementation of the present application is described in detail in combination with specific embodiments as follows:

[0037] Referring to FIGS. 1, 2 and 3, some embodiments of the present application provide a dielectric cavity resonator, which includes a resonator shell 10 and a dielectric resonant piece 20. The resonator shell 10 has a first plate 11 and a second plate 12 arranged oppositely. The dielectric resonant piece 20 is arranged in the resonator shell 10. The dielectric resonant piece 20 includes a dielectric main body 21 connected to the first plate 11, and a dielectric column 22 protruding from a side of the dielectric main body 21 facing the second plate 12. The dielectric column 22 is arranged spaced apart from the second plate 12. The dielectric main body 21 is used to determine the resonant frequency of TE mode, and the dielectric column 22 is used to determine the resonant frequency of TM mode, so that the resonant frequency of TE mode and the resonant frequency of TM mode are in the same frequency band.

[0038] It should be noted that the medium cavity resonator provided in the present application can couple at least two orthogonal resonant modes of TE mode and TM mode in a single cavity, that is, while the medium cavity resonator couples two modes of TE mode and TM mode, the medium cavity resonator can also couple other modes in addition to TE mode and TM mode, or can not couple other modes in addition to TE mode and TM mode. When the medium cavity resonator only couples two resonant modes of TE mode and TM mode in a single cavity, the medium cavity resonator is a TE-TM dual-mode resonator; when the medium cavity resonator couples two resonant modes of TE mode and TM mode in a single cavity, and also couples other resonant modes (for example, HE mode), the medium cavity resonator is a multi-mode resonator (for example, a three-mode resonator, a four-mode resonator).

[0039] It should also be noted that the inside of the resonator shell 10 has a resonant cavity 13 (which can be an air cavity). The resonant cavity 13 can be, but is not limited to, a rectangular resonant cavity, a square resonant cavity, a polygonal columnar resonant cavity, a cylindrical resonant cavity, etc. The resonant cavity 13 can accommodate a dielectric resonator 20. Optionally, the dielectric resonator 20 can be arranged centrally in the resonant cavity 13. The resonator shell 10 can achieve a shielding function to prevent signal leakage.

[0040] One side of the resonator shell 10 is a first plate 11, and the plate opposite the first plate 11 of the resonator shell 10 is a second plate 12. In actual application scenarios, the resonator shell 10 can be placed with the second plate 12 facing up, or placed with the second plate 12 facing left, right, front, or back. In addition, the shape, size, material, etc. of the resonator shell 10 can be flexibly set as needed.

[0041] It should also be noted that the dielectric resonator 20 is a resonator rod made of dielectric material. The dielectric resonator 20 can be a ceramic dielectric resonator or a dielectric resonator of other materials. The dielectric resonator 20 includes a dielectric body 21 and a dielectric column 22. The side of the dielectric body 21 facing the first plate 11 is connected to the first plate 11. The dielectric body 21 can be directly connected and fixed to the first plate 11 by means of, but not limited to, welding, bonding, riveting, crimping, insertion, screw fastening, threaded connection, clamping, etc., or can be indirectly connected and fixed to the first plate 11 by means of other structures connected thereto (for example, a dielectric rod 23, a bottom table 14, an alumina base, other ceramic bases, coupling ribs, metal connecting pieces, etc.). The spacing direction of the first plate 11 and the second plate 12 is the first direction y, and in the case where the dielectric body 21 is connected to the first plate 11, the central axis L of the dielectric body 21 is parallel or substantially parallel to the first direction y, that is, the axial direction of the dielectric body 21 (i.e. the axial direction of the dielectric resonator 20) is parallel or substantially parallel to the first direction y.

[0042] The medium body 21 is the part of the medium resonant piece 20 for affecting and determining the resonant frequency of the TE mode. As shown in FIG. 4, since the electric field of the TE mode is horizontally (i.e. parallel to the orientation of the first plate piece 11) circularly distributed and the magnetic field is vertically (i.e. perpendicular to the orientation of the first plate piece 11) circularly distributed, the electric field of the TE mode is more concentratedly distributed in the center of the resonant cavity 13 and circularly surrounds. Therefore, the resonant frequency of the TE mode can be affected and determined by the medium body 21 substantially in the center of the resonant cavity 13. Specifically, the resonant frequency of the TE mode can be adjusted by adjusting the radial dimension and thickness (i.e. the dimension of the medium body 21 along its axial direction) of the medium body 21. Wherein, the greater the radial dimension of the medium body 21, the lower the resonant frequency of the TE mode; the smaller the radial dimension of the medium body 21, the higher the resonant frequency of the TE mode. The greater the thickness of the medium body 21, the lower the resonant frequency of the TE mode; the smaller the thickness of the medium body 21, the higher the resonant frequency of the TE mode. Wherein, the medium body 21 can be but not limited to a disc, a column, a block, etc., the cross-sectional shape of the medium body 21 perpendicular to its axial direction can be but not limited to a circle, a rectangle, a square, a polygon, a petal, a cross, etc., and the cross-sectional shape of the medium body 21 parallel to its axial direction can be but not limited to a circle, a rectangle, a square, a polygon, a petal, a cross, etc.

[0043] The medium column 22 is protruded from the medium main body 21 towards the second plate member 12. The medium column 22 can be coaxially arranged with the medium main body 21, or can be arranged in parallel with the medium main body 21. The medium column 22 can be one or more. The medium column 22 can be integrally connected with the medium main body 21, or can be separately connected with the medium main body 21. The medium column 22 is spaced apart from the second plate member 12. The medium column 22 is a part of the medium resonant member 20 for affecting or determining the resonant frequency of the TM mode. As shown in FIG. 5, the magnetic field of the TM mode is horizontally distributed in a ring shape, and the electric field of the TM mode is vertically distributed in a ring shape. The electric field of the TM mode is more concentrated between the medium resonant member 20 and the second plate member 12. Therefore, the resonant frequency of the TM mode can be affected or determined by the medium column 22 protruded from the medium main body 21 towards the second plate member 12. The cross-sectional shape of the medium column 22 perpendicular to the axial direction of the medium column 22 can be, but is not limited to, a circle, a rectangle, a polygon, a petal shape, a cross shape, etc. Specifically, the resonant frequency of the TM mode can be adjusted by adjusting the number of the medium column 22, the position of the medium column 22, the radial size of the medium column 22, and the distance between the medium column 22 and the second plate member 12. The more the number of the medium column 22, the lower the resonant frequency of the TM mode. The less the number of the medium column 22, the higher the resonant frequency of the TM mode. The closer the position of the medium column 22 to the central axis L of the medium main body 21, the lower the resonant frequency of the TM mode. The farther the position of the medium column 22 from the central axis L of the medium main body 21, the higher the resonant frequency of the TM mode. The larger the radial size of the medium column 22, the lower the resonant frequency of the TM mode. The smaller the radial size of the medium column 22, the higher the resonant frequency of the TM mode. The smaller the distance between the medium column 22 and the second plate member 12 (i.e., the closer the medium column 22 to the second plate member 12), the lower the resonant frequency of the TM mode. The larger the distance between the medium column 22 and the second plate member 12 (i.e., the farther the medium column 22 from the second plate member 12), the higher the resonant frequency of the TM mode.

[0044] Therefore, the resonant frequency of the TE mode can be adjusted by adjusting the radial size and the thickness of the medium main body 21, and the resonant frequency of the TM mode can be adjusted by adjusting the number of the medium column 22, the position of the medium column 22, the radial size of the medium column 22, and the distance between the medium column 22 and the second plate member 12, so that the resonant frequency of the TE mode and the resonant frequency of the TM mode are close to each other and close to the same frequency band and within the passband range. In some embodiments, the radial size of the medium column 22 is smaller than the radial size of the medium main body 21. Of course, in other embodiments, the radial size of the medium column 22 can be equal to the radial size of the medium main body 21 when the resonant frequency of the TE mode and the resonant frequency of the TM mode can be close to the same frequency band.

[0045] In summary, the medium cavity resonator provided in the embodiments of the present application can affect and determine the resonant frequency of the TE mode through the medium body 21 of the medium resonant element 20. The resonant frequency of the TM mode can be affected and determined through the medium column 22 protruding from the medium body 21 towards the second plate element 12. Based on this, the resonant frequency of the TE mode can be adjusted by adjusting the radial dimension and thickness of the medium body 21, and the resonant frequency of the TM mode can be adjusted by adjusting the number of the medium columns 22, the position of the medium column 22, the radial dimension of the medium column 22, and the spacing between the medium column 22 and the second plate element 12, so that the resonant frequency of the TE mode is close to the resonant frequency of the TM mode, and the resonant frequency of the TE mode and the resonant frequency of the TM mode are within the passband range and close to the same frequency band. Thus, the medium cavity resonator can couple at least two orthogonal resonant modes of high Q value of the TE mode and the TM mode in a single cavity, and can be coupled with a resonator such as a metal coaxial resonator based on the TE mode and the TM mode, and the coupling effect is better, so that the usability, applicability and practicability of the medium cavity resonator are better. Moreover, the medium cavity resonator can achieve at least two-order filtering effect, which is equivalent to the filtering effect of at least two single-mode resonators in series, i.e. equivalent to the filtering effect of at least two microwave resonators, so that the performance and space utilization of the medium cavity resonator can be improved. Moreover, the medium cavity resonator has a small size, which is beneficial to miniaturization and light weight.

[0046] As shown in FIGS. 6 and 7, in one specific application example, the medium cavity resonator couples two orthogonal resonant modes of the TE mode and the TM mode in a single cavity, i.e. the medium cavity resonator is a TE-TM dual-mode resonator. In the TE-TM dual-mode resonator, the resonant frequency of the TE mode and the resonant frequency of the TM mode are close to 2.6 GHz, the Q value of the TM mode is about 8700, and the Q value of the TE mode is about 14000.

[0047] Please refer to FIGS. 2 and 3, in some embodiments of the present application, the central axis L of the medium body 21 passes through the medium column 22 along the axial direction of the medium body 21. That is, the medium column 22 is arranged at the central axis L of the medium body 21, and the medium column 22 coincides with the central axis L of the medium body 21. It should be noted that in the present embodiment, the central axis of the medium column 22 and the central axis L of the medium body 21 can be arranged in coincidence or in parallel and spaced apart. In the case of being arranged in parallel and spaced apart, it is necessary to ensure that the central axis L of the medium body 21 can pass through the medium column 22, i.e. the central axis L of the medium body 21 is between the outer peripheral surface of the medium column 22 and the central axis of the medium column 22.

[0048] As shown in FIG. 5, due to the vertical ring distribution of the electric field of the TM mode, the electric field of the TM mode is more concentratedly distributed between the dielectric resonant piece 20 and the second plate piece 12, and is concentratedly distributed at the central axis L of the dielectric body 21, therefore, along the axial direction of the dielectric body 21, by making the central axis L of the dielectric body 21 pass through the dielectric column 22, the dielectric column 22 coincides with the central axis L of the dielectric body 21, the dielectric column 22 can be located at the concentrated position of the electric field of the TM mode. Based on this, the dielectric column 22 has a greater influence on the resonant frequency of the TM mode, and a more significant regulation effect of the dielectric column 22 on the resonant frequency of the TM mode can be achieved, which facilitates convenient and rapid regulation of the resonant frequency of the TM mode, can increase the adjustable range of the resonant frequency of the TM mode, and can more easily regulate the resonant frequency of the TM mode to the required range. Therefore, the adjustment convenience and accuracy of the resonant frequency of the TM mode can be improved, the design of "the resonant frequency of the TE mode and the resonant frequency of the TM mode are in the passband range and close to the same frequency band" can be facilitated, and the performance and design flexibility of the dielectric cavity resonator can be improved.

[0049] In some embodiments, the central axis of the dielectric column 22 coincides with the central axis L of the dielectric body 21, in which case the dielectric column 22 has the greatest influence on the resonant frequency of the TM mode, and the regulation effect of the dielectric column 22 on the resonant frequency of the TM mode is the most significant.

[0050] Of course, in other embodiments, along the axial direction of the dielectric body 21, the central axis L of the dielectric body 21 does not pass through the dielectric column 22. That is, the dielectric column 22 does not coincide with the central axis L of the dielectric body 21, and the outer peripheral surface of the dielectric column 22 is spaced apart from the central axis L of the dielectric body 21.

[0051] Please refer to FIG. 2, FIG. 8, FIG. 9, in some embodiments of the present application, the dielectric body 21 is provided with a recess 211.

[0052] It should be noted that any region of the medium body 21 can be provided with a recess 211 as needed, so that the part of the medium body 21 at the region provided with the recess 211 is hollowed out. The main function of the recess 211 is to increase the resonant frequency of the TE mode. The recess 211 can be provided on the end surface of the medium body 21 facing the first plate member 11, the end surface of the medium body 21 facing the second plate member 12, or the outer circumferential surface of the medium body 21. The recess 211 can include at least one of a hole and a groove. The hole can be a blind hole or a through hole. The hole can be a circular hole, a rectangular hole, a waist-shaped hole, a special-shaped hole, etc. The groove can be a straight groove, a curved groove, an arc-shaped groove, a ring-shaped groove, etc. The ring-shaped groove can be in the shape of a cylindrical groove, a conical groove, a table groove, a stepped groove, or other shapes. Based on the recess 211, the medium body 21 can be partially thinned, and in particular, the thickness of the part of the medium body 21 corresponding to the recess 211 along the axial and radial directions thereof can be reduced to zero. Based on this, the resonant frequency of the TE mode can be finely increased by accurately designing the shape (e.g., groove, hole, etc.), shape (e.g., ring, circle, rectangle, ellipse, etc.), size (e.g., depth, width, length, etc.), number, position, etc. of the recess 211, so as to make the resonant frequency of the TE mode close to the resonant frequency of the TM mode and approach the same frequency band and be within the passband range.

[0053] By adopting the above scheme, the resonant frequency of the TE mode can be increased by providing the medium body 21 with a recess 211 to reduce the size of the part of the medium body 21 corresponding to the recess 211 along the axial and radial directions thereof. Based on this, the resonant frequency of the TE mode can be finely adjusted (increased) by accurately designing the shape, size, number, and position, etc. of the recess 211, so as to facilitate the design of “the resonant frequency of the TE mode and the resonant frequency of the TM mode being within the passband range and approaching the same frequency band”, improve the design convenience and processing convenience of the medium resonant piece 20 and the medium cavity resonator, and improve the performance of the medium cavity resonator. Moreover, the design of the recess 211 can also reduce the weight of the medium body 21 and the medium resonant piece 20, so as to reduce the weight of the medium cavity resonator on the premise of optimizing the performance, which is conducive to the lightweight of the medium cavity resonator. Moreover, when the medium cavity resonator only couples the TE mode and the TM mode, i.e., the medium cavity resonator is a TE-TM dual-mode resonator, the recess 211 not only has the function of increasing the resonant frequency of the TE mode, but also has the function of pushing away the resonant frequency of the HE mode. Based on this, the resonant frequency of the HE mode originally outside the passband range can be further pushed away to reduce the interference from the HE mode, so as to make the TE-TM dual-mode resonator only couple the TE mode and the TM mode, and not couple the HE mode, which can optimize the performance of the medium cavity resonator when the medium cavity resonator is a TE-TM dual-mode resonator.

[0054] Of course, in other embodiments, the medium body 21 can omit the recess 211, and directly adjust the resonant frequency of the TE mode based on the overall radial dimension and thickness.

[0055] Referring to FIGS. 2, 8, and 9, in some embodiments of the present application, the recess 211 includes a first recess 2111 formed in an end face of the medium body 21, and the first recess 2111 is disposed between the outer peripheral surface of the medium body 21 and the central axis L of the medium body 21.

[0056] It should be noted that the medium body 21 has two end faces, which are two end faces opposite along the axial direction of the medium body 21. The outer peripheral surface of the medium body 21 is a peripheral surface connecting the two end faces of the medium body 21.

[0057] It should also be noted that the first recess 2111 can be in the form of a hole or in the form of a groove. The first recess 2111 can be formed in any end face of the medium body 21 and located between the outer peripheral surface of the medium body 21 and the central axis L of the medium body 21. Among them, the first recess 2111 can be disposed exactly in the middle, or can be arranged towards the outer peripheral surface of the medium body 21 or towards the central axis L of the medium body 21. Among them, the more the number of holes or grooves included in the first recess 2111, the higher the resonant frequency of the TE mode; the deeper the depth of each part of the first recess 2111, the higher the resonant frequency of the TE mode; the wider the width of each part of the first recess 2111, the higher the resonant frequency of the TE mode; the longer the extension path of the first recess 2111, the higher the resonant frequency of the TE mode; the closer the position of the first recess 2111 to the outer peripheral surface of the medium body 21, the higher the resonant frequency of the TE mode; and so on. Based on this, the number, size, shape, and position of the first recess 2111 can be accurately adjusted to accurately control the resonant frequency of the TE mode, thereby facilitating the accurate design of the "resonant frequency of the TE mode and resonant frequency of the TM mode in the passband range and close to the same frequency band", and facilitating the improvement of the performance of the dielectric cavity resonator.

[0058] By adopting the above scheme, by opening the first recess 2111 on the end surface of the medium body 21, and arranging the first recess 2111 between the outer circumferential surface of the medium body 21 and the central axis L of the medium body 21, the depth direction of the first recess 2111 corresponds to the axial direction of the medium body 21, so that the specific area of the medium body 21 can be thinned directly along the axial direction of the medium body 21, thereby conveniently, controllably and accurately improving the resonance frequency of the TE mode. Moreover, since the electric field of the TE mode is relatively concentrated around the circumferential side of the medium body 21, when the recess 211 is on the outer circumferential side of the medium body 21, it has the greatest influence on the resonance frequency of the TE mode; when the recess 211 is on the central axis of the medium body 21, it has the least influence on the resonance frequency of the TE mode. By arranging the first recess 2111 between the outer circumferential surface of the medium body 21 and the central axis L of the medium body 21, the first recess 2111 can be avoided from the outer circumferential surface of the medium body 21, so as to reduce the situation that the resonance frequency of the TE mode is suddenly increased due to the excessive influence of the first recess 2111 on the resonance frequency of the TE mode; at the same time, the first recess 2111 also avoids the central axis L of the medium body 21, so as to reduce the situation that the resonance frequency of the TE mode cannot be significantly increased due to the excessively small influence of the first recess 2111 on the resonance frequency of the TE mode. Based on this, it is convenient to more finely regulate and control the resonance frequency of the TE mode, that is, the resonance frequency of the TE mode can be more accurately, finely and stably increased while increasing the resonance frequency of the TE mode, so as to more accurately control the resonance frequency of the TE mode. At the same time, the electric field of the TM mode is relatively concentrated at the central axis L of the medium body 21, and the first recess 2111 avoids the central axis L of the medium body 21, so as to correspondingly reduce the influence of the first recess 2111 on the resonance frequency of the TM mode, thereby facilitating the accurate design that the resonance frequency of the TE mode and the resonance frequency of the TM mode are in the passband range and close to the same frequency band, and facilitating the improvement of the performance of the dielectric cavity resonator. Moreover, the first recess 2111 is opened on the end surface of the medium body 21, so as to facilitate the design of the mold, facilitate the one-piece molding of the medium body 21 and the first recess 2111 thereof via the mold, especially improve the demolding convenience of the mold after the molding of the medium body 21 (demolding can be performed along the axial direction of the medium body 21), improve the molding convenience and molding precision of the medium body 21, and reduce the cost of the mold and the processing cost of the medium body 21.

[0059] Please refer to FIG. 2 and FIG. 8, in some embodiments of the present application, the recess 211 includes a second recess 2112 opened on the circumferential edge of the medium body 21, and the second recess 2112 communicates to the outer circumferential surface of the medium body 21 and at least one end surface of the medium body 21.

[0060] It should be noted that the second recess 2112 can adopt a form of an opening or a form of a groove. The second recess 2112 is arranged on the periphery of the dielectric body 21, and the second recess 2112 simultaneously communicates to the outer peripheral surface of the dielectric body 21 and at least one end surface of the dielectric body 21. The depth direction of the second recess 2112 (for example, the hole depth direction of the opening or the groove depth direction of the groove) corresponds to (i.e., is substantially parallel to) both the radial direction of the dielectric body 21 and the axial direction of the dielectric body 21. The second recess 2112 can communicate to the corresponding end surface of the dielectric body 21 along one side of the axial direction of the dielectric body 21, or the second recess 2112 can communicate to the opposite two end surfaces of the dielectric body 21 along opposite sides of the axial direction of the dielectric body 21. The more openings or grooves included in the second recess 2112, the higher the resonance frequency of the TE mode; the deeper the depth of the second recess 2112 along the axial direction of the dielectric body 21, the higher the resonance frequency of the TE mode; the deeper the depth of the second recess 2112 along the radial direction of the dielectric body 21, the higher the resonance frequency of the TE mode; the longer the extension path of the second recess 2112, the higher the resonance frequency of the TE mode; and so on. Based on this, the number, size, shape, and position of the second recess 2112 can be accurately adjusted to accurately control the resonance frequency of the TE mode, thereby facilitating the accurate design of the TE mode resonance frequency and the TM mode resonance frequency being in the passband range and close to the same frequency band, and facilitating the improvement of the performance of the dielectric cavity resonator.

[0061] By adopting the above scheme, by opening the second recess 2112 at the periphery of the medium body 21, and making the second recess 2112 communicate to the outer peripheral surface of the medium body 21 and at least one end surface of the medium body 21, the depth direction of the second recess 2112 corresponds to the axial direction and the radial direction of the medium body 21, so that the specific area of the medium body 21 can be thinned along the axial direction and the radial direction of the medium body 21, thereby conveniently, controllably and accurately improving the resonance frequency of the TE mode. And because the electric field of the TE mode will be more concentrated around the periphery of the medium body 21, the second recess 2112 is at the periphery of the medium body 21 and communicates to the outer peripheral surface of the medium body 21, therefore, the second recess 2112 has the greatest influence on the resonance frequency of the TE mode. Based on this, the resonance frequency of the TE mode can be significantly increased through the second recess 2112, which facilitates convenient and rapid regulation of the resonance frequency of the TE mode, and can increase the range of the TE mode resonance frequency that can be improved, and can more easily increase the resonance frequency of the TE mode to the required range. At the same time, because the electric field of the TM mode is more concentrated at the central axis L of the medium body 21, based on the arrangement of the present embodiment, the second recess 2112 opened at the periphery of the medium body 21 can also greatly reduce the influence on the resonance frequency of the TM mode, and can conveniently and controllably improve the resonance frequency of the TE mode while basically keeping the resonance frequency of the TM mode unchanged. Thus, the adjustment convenience and accuracy of the resonance frequency of the TE mode can be improved, and the accurate design of "the resonance frequency of the TE mode and the resonance frequency of the TM mode are in the passband range and close to the same frequency band" can be facilitated, and the performance and design flexibility of the dielectric cavity resonator can be improved. Moreover, the second recess 2112 communicates to at least one end surface of the medium body 21, which can facilitate the design of the mold, and can facilitate the integrated molding of the medium body 21 and the second recess 2112 thereof through the mold, especially the demolding convenience of the mold after the medium body 21 is molded (demolding can be performed along the axial direction of the medium body 21), which can improve the molding convenience and accuracy of the medium body 21, and can reduce the cost of the mold and the processing cost of the medium body 21.

[0062] Please refer to FIG. 2 and FIG. 9. In some embodiments of the present application, the recess 211 includes a third recess 2113 formed on the outer circumferential surface of the medium body 21, and the third recess 2113 is arranged between the two end surfaces of the medium body 21. It should be noted that the third recess 2113 can be in the form of a hole or a groove. The third recess 2113 is formed on the outer circumferential surface of the medium body 21 and is located between the two opposite end surfaces of the medium body 21 in the axial direction. That is, in the axial direction of the medium body 21, the third recess 2113 does not communicate with any end surface of the medium body 21, and the opposite ends of the third recess 2113 in the axial direction of the medium body 21 are closed. Among them, the more the number of holes or grooves included in the third recess 2113, the higher the resonance frequency of the TE mode; the deeper the third recess 2113, the higher the resonance frequency of the TE mode; the wider the third recess 2113, the higher the resonance frequency of the TE mode; the longer the extension path of the third recess 2113, the higher the resonance frequency of the TE mode; and so on. Based on this, the number, size, shape and position of the third recess 2113 can be accurately adjusted to accurately control the resonance frequency of the TE mode, thereby facilitating the accurate design of "the resonance frequency of the TE mode and the resonance frequency of the TM mode being in the passband range and close to the same frequency band", and facilitating the improvement of the performance of the dielectric cavity resonator.

[0063] By adopting the above scheme, by forming the third recess 2113 on the outer circumferential surface of the medium body 21 and arranging the third recess 2113 between the two end surfaces of the medium body 21, the depth direction of the third recess 2113 corresponds to the radial direction of the medium body 21, which can facilitate the thinning of a specific area of the medium body 21 in the radial direction of the medium body 21, thereby conveniently, controllably and accurately improving the resonance frequency of the TE mode. Moreover, since the electric field of the TE mode is relatively concentrated around the circumferential side of the medium body 21, when the third recess 2113 is on the outer circumferential surface of the medium body 21, the third recess 2113 has a greater impact on the resonance frequency of the TE mode. Therefore, the third recess 2113 can be used to significantly increase the resonance frequency of the TE mode, facilitating convenient and rapid regulation of the resonance frequency of the TE mode, increasing the range of improvement of the resonance frequency of the TE mode, and more easily increasing the resonance frequency of the TE mode to the required range. At the same time, since the electric field of the TM mode is relatively concentrated at the central axis L of the medium body 21, based on the arrangement of the present embodiment, the third recess 2113 formed on the outer circumferential surface of the medium body 21 can greatly reduce the impact on the resonance frequency of the TM mode, and can conveniently and controllably improve the resonance frequency of the TE mode while basically keeping the resonance frequency of the TM mode unchanged. Thus, the adjustment convenience and accuracy of the resonance frequency of the TE mode can be improved, and the resonance frequency of the TE mode and the resonance frequency of the TM mode can be accurately designed to be in the passband range and close to the same frequency band, thereby facilitating the improvement of the performance and design flexibility of the dielectric cavity resonator.

[0064] In the present application, the above-mentioned embodiments related to the "first recess 2111", the "second recess 2112", and the "third recess 2113" can be implemented individually, in pairs, or all together. For example, in the embodiment shown in FIG. 2, the medium body 21 can only be provided with the first recess 2111; for example, in the embodiment shown in FIG. 8, the medium body 21 can be provided with both the first recess 2111 and the second recess 2112; for example, in the embodiment shown in FIG. 9, the medium body 21 can be provided with both the first recess 2111 and the third recess 2113.

[0065] Please refer to FIG. 8 and FIG. 9, in some embodiments of the present application, the above-mentioned embodiments of the second recess 2112 and / or the third recess 2113 are combined with the embodiments of the first recess 2111. That is, the recess 211 includes the first recess 2111 and the second recess 2112; or, the recess 211 includes the first recess 2111 and the third recess 2113; or, the recess 211 includes the first recess 2111, the second recess 2112, and the third recess 2113.

[0066] Since the electric field of the TE mode is more concentrated around the circumference of the medium body 21, the second recess 2112 is located on the circumference of the medium body 21 and communicates with the outer circumferential surface of the medium body 21, and the third recess 2113 is located on the outer circumferential surface of the medium body 21, therefore, the second recess 2112 and the third recess 2113 have a greater influence on the resonance frequency of the TE mode, and the influence of the second recess 2112 and the third recess 2113 on the resonance frequency of the TE mode is more significant; and the first recess 2111 avoids the outer circumferential surface of the medium body 21, therefore, compared with the second recess 2112 and the third recess 2113, the first recess 2111 has a smaller influence on the resonance frequency of the TE mode; and the first recess 2111 avoids the central axis L of the medium body 21, and the first recess 2111 will not lose the effect of increasing the frequency due to the too small influence on the resonance frequency of the TE mode.

[0067] By adopting the above scheme, the resonance frequency of the TE mode can be significantly increased by the second recess 2112 and / or the third recess 2113, and at the same time, the resonance frequency of the TE mode is slightly increased by the first recess 2111. Based on this, the resonance frequency of the TE mode can be more finely controlled on the basis of "conveniently and quickly controlling the resonance frequency of the TE mode, increasing the range of the TE mode resonance frequency that can be increased, and more easily increasing the resonance frequency of the TE mode to the required range". That is, the resonance frequency of the TE mode can be significantly increased to the vicinity of the required range by the second recess 2112 and / or the third recess 2113, and then the resonance frequency of the TE mode is accurately and slightly increased to the required range by the first recess 2111. In this way, the resonance frequency of the TE mode can be more finely controlled, the resonance frequency of the TE mode can be more accurately, finely and stably increased while significantly increasing the resonance frequency of the TE mode, and the resonance frequency of the TE mode can be more accurately controlled, thereby facilitating the accurate design of "the resonance frequency of the TE mode and the resonance frequency of the TM mode being in the passband range and close to the same frequency band", and facilitating the improvement of the performance and design flexibility of the dielectric cavity resonator.

[0068] Please refer to FIG. 10, in some embodiments of the present application, the resonator shell 10 has a grounding component 15 connected to the first plate 11, the recess 211 includes an annular recess 2114, the annular recess 2114 continuously or discontinuously surrounds the annular shape, the central axis of the annular recess 2114 coincides with the central axis L of the dielectric body 21, the recess bottom of the annular recess 2114 is closed, and the grounding component 15 closes the notch of the annular recess 2114, so that the resonance frequency of the HE dual mode is in the same frequency band as the resonance frequency of the TE mode and the resonance frequency of the TM mode.

[0069] It is to be noted that the annular recess 2114 can be continuous or discontinuous in the overall circumferential direction, and the central axis of the annular recess 2114 (i.e. the circumferential axis) coincides with the central axis L of the dielectric body 21. In some embodiments, the annular recess 2114 can be a complete continuous annular structure, such as an annular groove. In other embodiments, the annular recess 2114 can also be a discontinuous structure formed by multiple parts, such as multiple arc grooves circumferentially arranged around the shaft and collectively forming the annular recess 2114, or multiple blind holes circumferentially arranged around the shaft and collectively forming the annular recess 2114, or multiple straight grooves circumferentially arranged around the shaft and collectively forming the annular recess 2114. The annular recess 2114 has a closed bottom, i.e. the annular recess 2114 does not include a through-hole structure. The annular recess 2114 can be arranged on any end surface, peripheral edge or outer peripheral surface of the dielectric body 21. When the annular recess 2114 is a complete continuous annular groove, the recess of the annular recess 2114 is the groove opening of the annular groove. When the annular recess 2114 is a discontinuous structure formed by multiple parts, the recess of the annular recess 2114 includes the openings of the parts, such as the groove openings of the arc grooves, or the hole openings of the blind holes, or the groove openings of the straight grooves, etc.

[0070] It is also to be noted that the resonator housing 10 has a grounding component 15. The grounding component 15 can be the first plate 11 itself (i.e. the first plate 11 itself can serve as the grounding component 15); the grounding component 15 can also be a structural member (such as a metal grounding ring, a metal grounding post or the base 14, etc.) grounded to the first plate 11, which can be directly connected (not limited to integral connection or separate connection) to the first plate 11 to achieve grounding, or indirectly connected to the first plate 11 via other conductor components to achieve grounding, and the structural member can be a metal member as a whole or can have a metal layer on the surface (i.e. the part of the structural member located in the metal layer can be made of a non-metal material).

[0071] The grounding component 15 closes the recess of the annular recess 2114, so that the grounding component 15 and the annular recess 2114 can enclose at least one closed air cavity. As shown in FIG. 11, the electric field path of the HE dual mode in the air cavity is vertically distributed and has no substantial transmission utility, most of the electric field path of the HE dual mode needs to be bent around the air cavity and has substantial transmission utility, based on which the electric field path of the HE dual mode can be lengthened, the resonant frequency of the HE dual mode can be lowered, the resonant frequency of the HE dual mode can be made close to the resonant frequency of the TE mode and the resonant frequency of the TM mode, and the resonant frequencies of the HE dual mode, the TE mode and the TM mode can all be within the passband range and close to the same frequency band. That is, the dielectric cavity resonator of the present embodiment is a four-mode resonator.

[0072] The recess 211 includes an annular recess 2114, i.e. the annular recess 2114 has the relevant functions of the recess 211, and can cause the medium body 21 to be partially thinned, especially can cause the thickness of the medium body 21 along the axial direction corresponding to the annular recess 2114 to be reduced, and can also cause the size of the medium body 21 along the radial direction corresponding to the annular recess 2114 to be reduced accordingly. Based on this, the resonance frequency of the TE mode can be improved, and the resonance frequency of the TE mode can be finely improved by accurately designing the specific structure (such as an annular groove, multiple blind holes, multiple arc grooves, multiple straight grooves, etc.), size (such as depth, width, length, etc.), position, etc. of the annular recess 2114, so as to cause the resonance frequency of the TE mode to approach the resonance frequency of the TM mode and be close to the same frequency band and within the passband range. Among them, the more the number of blind holes and grooves included in the annular recess 2114, the higher the resonance frequency of the TE mode; the deeper the depth of each part of the annular recess 2114, the higher the resonance frequency of the TE mode; the wider the width of each part of the annular recess 2114, the higher the resonance frequency of the TE mode; the longer the extension path of the annular recess 2114, the higher the resonance frequency of the TE mode; the closer the position of the annular recess 2114 to the outer circumferential surface of the medium body 21, the higher the resonance frequency of the TE mode; and so on.

[0073] It should be noted that the grounding component 15 only needs to close the notch of at least one annular recess 2114, so as to cause the resonance frequency of the HE dual mode to approach the resonance frequency of the TE mode and the resonance frequency of the TM mode, and cause the resonance frequency of the HE dual mode, the resonance frequency of the TE mode and the resonance frequency of the TM mode to be within the passband range and close to the same frequency band. Therefore, the annular recess 2114 can be provided with one or multiple. In the case where multiple annular recesses 2114 are provided, the notches of all the annular recesses 2114 are closed by the grounding component 15. The annular recess 2114 whose notch is closed by the grounding component 15 has the functions of improving the resonance frequency of the TE mode and reducing the resonance frequency of the HE dual mode. It should be noted that the structure whose notch is not closed by the grounding component 15, even if it is continuous or discontinuous annular along its own circumferential direction as a whole, is not defined as the "annular recess 2114" in this embodiment, but can be regarded as "other recesses other than the annular recess 2114".

[0074] It should be noted that in some embodiments, the recess 211 can only include the annular recess 2114. In other embodiments, the recess 211 can include both the annular recess 2114 and other recesses in addition to the annular recess 2114. It can be understood that the other recesses in addition to the annular recess 2114 only have the utility of raising the resonant frequency of the TE mode, but do not have the utility of lowering the resonant frequency of the HE dual mode; the other recesses in addition to the annular recess 2114 can not be annular, can not be enclosed by the grounding component 15, can be in the form of a blind hole, a through hole, a groove, etc., wherein the axis can or can not coincide with the central axis L of the dielectric body 21.

[0075] By adopting the above scheme, the notch of the annular recess 2114 can be enclosed by the grounding component 15, so that the grounding component 15 and the annular recess 2114 can enclose at least one enclosed air cavity, and the air cavity can cause the electric field path of the HE dual mode inside the air cavity to be vertically distributed, and the path of most of the electric field, or even all of the electric field, of the HE dual mode needs to be bent around the air cavity, thereby prolonging the electric field path of the HE dual mode, lowering the resonant frequency of the HE dual mode, causing the resonant frequency of the HE dual mode to be close to the resonant frequency of the TE mode, the resonant frequency of the TM mode, and causing 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 range and close to the same frequency band. Thus, the dielectric cavity resonator can realize four resonant modes of coupling the TE mode, the TM mode, and the HE dual mode in a single cavity, i.e., the dielectric cavity resonator of the present embodiment is a four-mode resonator. The dielectric cavity resonator of the present embodiment can achieve a four-order filtering effect, which can be equivalent to the filtering effect of four single-mode resonators in series, thereby optimizing and improving the performance and space utilization of the dielectric cavity resonator.

[0076] Moreover, the annular recess 2114 can also cause the dielectric body 21 to be partially thinned, especially causing the thickness of the portion of the dielectric body 21 corresponding to the annular recess 2114 in the axial and radial directions to be reduced, thereby raising the resonant frequency of the TE mode, causing the resonant frequency of the TE mode to be close to the resonant frequency of the TM mode, and causing the resonant frequency of the TE mode and the resonant frequency of the TM mode to be within the passband range and close to the same frequency band.

[0077] Moreover, compared with the existing multi-mode resonator, the four-mode resonator is achieved without greatly increasing the size of the dielectric body 21, thereby facilitating the miniaturization of the overall size of the dielectric cavity resonator, and enabling the dielectric cavity resonator to meet the requirements of high performance and miniaturization. Moreover, since the dielectric cavity resonator resonates in the TE mode, the TM mode, the HE dual-mode, and the four resonant modes in a single cavity, the dielectric cavity resonator can be coupled with a resonator having any mode of the TE mode, the TM mode, the HE mode, and the TEM mode, and the coupling effect is better, thereby enabling the dielectric cavity resonator to have better usability, applicability, and practicality.

[0078] Moreover, in actual application scenarios, the dielectric cavity resonator can shorten the electric field path of the HE dual-mode by allowing the grounding component 15 to not close all the notches of the annular recesses 2114, so that the electric field path of the HE dual-mode can directly pass through the annular recesses 2114, thereby enabling all the annular recesses 2114 to have the functions of "increasing the resonant frequency of the TE mode" and "pushing away the resonant frequency of the HE dual-mode", and enabling the resonant frequency of the HE dual-mode to be pushed away to outside the passband range. Based on this, the dielectric cavity resonator can be conveniently, quickly, and flexibly switched between the four-mode resonator and the TE-TM dual-mode resonator. Thus, the dielectric cavity resonator has better use flexibility and use convenience.

[0079] As shown in FIGS. 12 and 13, in one specific application example, the dielectric cavity resonator resonates in the TE mode, the TM mode, and the HE dual-mode, i.e., the dielectric cavity resonator is a four-mode resonator. In the four-mode resonator, the resonant frequency of the HE dual-mode, the resonant frequency of the TE mode, and the resonant frequency of the TM mode are close to 2.4 GHz, the Q value (Quality Factor) 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.

[0080] Please refer to FIG. 10. In some embodiments of the present application, at least one annular recess 2114 is a first annular portion 2114a, the first annular portion 2114a is formed on the end surface of the dielectric body 21 facing the grounding component 15, and the first annular portion 2114a is arranged between the outer circumferential surface of the dielectric body 21 and the central axis L of the dielectric body 21. It should be noted that the first annular portion 2114a can be continuous or discontinuous in the overall circumferential direction. The first annular portion 2114a is formed on the end surface of the dielectric body 21 facing the grounding component 15, and the end of the first annular portion 2114a away from the grounding component 15 is closed. The first annular portion 2114a is arranged between the outer circumferential surface of the dielectric body 21 and the central axis L of the dielectric body 21. The first annular portion 2114a can be arranged exactly in the middle between the outer circumferential surface of the dielectric body 21 and the central axis L of the dielectric body 21, or can be arranged towards the outer circumferential surface of the dielectric body 21 or the central axis L of the dielectric body 21.

[0081] By adopting the above scheme, since the first annular portion 2114a is opened at the end surface of the dielectric body 21 facing the grounding member 15, and the end of the first annular portion 2114a away from the grounding member 15 is closed. Therefore, the grounding member 15 can directly close the notch of the first annular portion 2114a on the end side of the dielectric body 21, so as to make the resonant frequency of the HE dual mode close to the resonant frequency of the TE mode and the resonant frequency of the TM mode, thereby facilitating the structural design and layout design of the grounding member 15, and facilitating the design that the resonant frequency of the HE dual mode, the resonant frequency of the TE mode, and the resonant frequency of the TM mode are all within the passband range and close to the same frequency band.

[0082] Moreover, in the case where the annular recess portion 2114 only includes the first annular portion 2114a, the grounding member 15 can be provided on the end side of the dielectric body 21 as a whole (for example, in a plate shape, a block shape, a column shape, etc.), without the need to provide other parts on the outer periphery of the dielectric body 21, so that more parts of the dielectric body 21 and the dielectric column 22 can be exposed outside the grounding member 15, the case that the electromagnetic field on the outer periphery of the dielectric resonator 20 is shielded by the grounding member 15 can be reduced, and the performance of the dielectric cavity resonator when used as a four-mode resonator can be optimized and improved.

[0083] Moreover, the first annular portion 2114a is a special form of the first recessed portion 2111, and the first annular portion 2114a has the related utility of the first recessed portion 2111. That is, by opening the first annular portion 2114a on the end surface of the dielectric body 21 facing the grounding component 15, and arranging the first annular portion 2114a between the outer circumferential surface of the dielectric body 21 and the central axis L of the dielectric body 21, the depth direction of the first annular portion 2114a can correspond to the axial direction of the dielectric body 21, so that the specific area of the dielectric body 21 can be thinned directly along the axial direction of the dielectric body 21, thereby facilitating the controllable and accurate improvement of the resonant frequency of the TE mode. Moreover, since the electric field of the TE mode is more concentrated around the circumference of the dielectric body 21, when the annular recessed portion 2114 is on the outer circumferential side of the dielectric body 21, it has the greatest influence on the resonant frequency of the TE mode; when the annular recessed portion 2114 is on the central axis of the dielectric body 21, it has the least influence on the resonant frequency of the TE mode. By arranging the first annular portion 2114a between the outer circumferential surface of the dielectric body 21 and the central axis L of the dielectric body 21, the first annular portion 2114a can be away from the outer circumferential surface of the dielectric body 21, so as to avoid the resonant frequency of the TE mode from increasing abruptly due to the excessive influence of the first annular portion 2114a on the resonant frequency of the TE mode; at the same time, the first annular portion 2114a is also away from the central axis L of the dielectric body 21, so as to avoid the resonant frequency of the TE mode from being unable to increase significantly due to the insufficient influence of the first annular portion 2114a on the resonant frequency of the TE mode. Based on this, it is convenient to more finely regulate the resonant frequency of the TE mode, that is, the resonant frequency of the TE mode can be more accurately, finely and stably increased while increasing the resonant frequency of the TE mode, so as to more accurately control the resonant frequency of the TE mode. At the same time, the electric field of the TM mode is more concentrated at the central axis L of the dielectric body 21, and the first annular portion 2114a is away from the central axis L of the dielectric body 21, so as to correspondingly reduce the influence of the first annular portion 2114a on the resonant frequency of the TM mode, thereby facilitating the accurate design of the resonant frequency of the HE dual mode, the resonant frequency of the TE mode, and the resonant frequency of the TM mode all being within the passband range and close to the same frequency band.

[0084] Moreover, the first annular portion 2114a is opened on the end surface of the dielectric body 21 facing the grounding component 15, which can facilitate the design of the mold, facilitate the one-piece molding of the dielectric body 21 and the first annular portion 2114a thereof via the mold, especially improve the demolding convenience of the mold after the dielectric body 21 is molded (demolding can be performed along the axial direction of the dielectric body 21), improve the molding convenience and precision of the dielectric body 21, and reduce the cost of the mold and the processing cost of the dielectric body 21.

[0085] Please refer to FIG. 14, FIG. 15, in some embodiments of the present application, the grounding component 15 comprises a grounding table 151 arranged at the end side of the dielectric resonant piece 20, and a grounding ring 152 connected to the grounding table 151 and surrounding the outer periphery of the dielectric resonant piece 20, and the end of the dielectric resonant piece 20 away from the grounding table 151 protrudes out of the grounding ring 152. It should be noted that the grounding component 15 comprises the grounding table 151 and the grounding ring 152. The grounding table 151 is the part arranged at the end side of the dielectric resonant piece 20. The grounding ring 152 is the part connected to the periphery of the grounding table 151, and the grounding ring 152 and the grounding table 151 can enclose a groove-shaped accommodating space, part of the dielectric resonant piece 20 is accommodated in the accommodating space enclosed by the grounding ring 152 and the grounding table 151, and the end of the dielectric resonant piece 20 away from the grounding table 151 needs to protrude to the outside of the grounding ring 152, wherein the "end of the dielectric resonant piece 20 away from the grounding table 151" can only include the dielectric column 22, or can include the end of the dielectric column 22 and the dielectric main body 21 away from the grounding table 151. Wherein the grounding ring 152 and the grounding table 151 can be integrally connected, or can be connected in a split manner. The grounding component 15 can close the notch of the annular recess 2114 through at least one of the grounding table 151 and the grounding ring 152.

[0086] By adopting the above scheme, the grounding component 15 can form a groove-shaped accommodating space by enclosing the grounding table 151 and the grounding ring 152 to limit and accommodate part of the dielectric resonant piece 20, so as to realize the limitation and positioning of the dielectric resonant piece 20, thereby facilitating and quickly and stably installing the dielectric resonant piece 20, improving the assembly convenience and efficiency of the dielectric resonant piece 20, and improving the assembly efficiency of the dielectric cavity resonator. Moreover, the end of the dielectric resonant piece 20 away from the grounding table 151 protrudes out of the grounding ring 152, so that the grounding component 15 does not cover the whole dielectric resonant piece 20, thereby avoiding the situation that the electromagnetic field of the outer periphery of the dielectric resonant piece 20 is completely shielded by the grounding component 15, and maintaining the performance of the dielectric cavity resonator when it is used as a four-mode resonator.

[0087] Of course, in other embodiments, the grounding component 15 can only include the grounding table 151 arranged at the end side of the dielectric resonant piece 20, that is, the grounding component 15 can be arranged at the end side of the dielectric resonant piece 20 as a whole, and the grounding component 15 as a whole can be in the shape of a plate, a block, a column, etc. This embodiment is mainly applicable to the case where the "annular recess 2114 only includes the first annular part 2114a".

[0088] Please refer to FIG. 14, in some embodiments of the present application, at least one annular recess 2114 is a second annular part 2114b arranged at the periphery of the dielectric main body 21, and the second annular part 2114b communicates to the outer periphery of the dielectric main body 21 and the end surface of the dielectric main body 21 facing the grounding table 151.

[0089] It should be noted that the second annular portion 2114b can be continuous or discontinuous annular in the overall circumferential direction. The second annular portion 2114b is opened on the circumferential edge of the dielectric body 21, and the second annular portion 2114b is simultaneously communicated to the outer circumferential surface of the dielectric body 21 and the end surface of the dielectric body 21 facing the grounding table 151. The side of the second annular portion 2114b away from the grounding table 151 is closed, that is, not communicated to the end surface of the dielectric body 21 away from the grounding table 151. The depth direction of the second annular portion 2114b corresponds to the radial direction of the dielectric body 21 and the axial direction of the dielectric body 21.

[0090] By adopting the above scheme, by opening the second annular portion 2114b on the circumferential edge of the dielectric body 21, and making the second annular portion 2114b communicated to the outer circumferential surface of the dielectric body 21 and the end surface of the dielectric body 21 facing the grounding table 151, the grounding component 15 can be closed via the grounding table 151 to the notch of the second annular portion 2114b communicated to the end surface of the dielectric body 21, and the grounding component 15 can be closed via the grounding ring 152 to the notch of the second annular portion 2114b communicated to the outer circumferential surface of the dielectric body 21, so that the structural design and layout design of the grounding component 15 can be facilitated, and the "HE dual-mode resonant frequency, TE mode resonant frequency, TM mode resonant frequency are all within the passband range and close to the same frequency band" can be designed. And in the case that the grounding ring 152 only needs to close the second annular portion 2114b, the height of the grounding ring 152 in the axial direction of the dielectric body 21 only needs to cover the notch of the second annular portion 2114b communicated to the outer circumferential surface of the dielectric body 21, so that a relatively high grounding ring 152 is not required, so that a relatively large part of the dielectric body 21 and the dielectric column 22 can be exposed outside the grounding ring 152, the electromagnetic field shielding of the dielectric resonator 20 by the grounding ring 152 can be reduced, and the performance of the dielectric cavity resonator as a four-mode resonator can be maintained.

[0091] Moreover, the second annular portion 2114b is a special form of the second recessed portion 2112, and the second annular portion 2114b has the related utility of the second recessed portion 2112. That is, by opening the second annular portion 2114b on the periphery of the medium body 21 and connecting the second annular portion 2114b to the outer circumferential surface of the medium body 21 and the end surface of the medium body 21 facing the ground table 151, so that the depth direction of the second annular portion 2114b corresponds to the axial direction and the radial direction of the medium body 21, it is convenient to thin the specific area of the medium body 21 along the axial direction and the radial direction of the medium body 21, so as to conveniently, controllably and accurately improve the resonance frequency of the TE mode. Moreover, since the electric field of the TE mode is relatively concentrated around the periphery of the medium body 21, the second annular portion 2114b is located on the periphery of the medium body 21 and is connected to the outer circumferential surface of the medium body 21, therefore, the second annular portion 2114b has the greatest influence on the resonance frequency of the TE mode. Based on this, the second annular portion 2114b can be used to significantly increase the resonance frequency of the TE mode, which is convenient for adjusting the resonance frequency of the TE mode, can increase the range of increasing the resonance frequency of the TE mode, and can more easily increase the resonance frequency of the TE mode to the required range. At the same time, since the electric field of the TM mode is relatively concentrated at the central axis L of the medium body 21, based on the arrangement of the present embodiment, the second annular portion 2114b opened on the periphery of the medium body 21 can greatly reduce the influence on the resonance frequency of the TM mode, and can conveniently and controllably increase the resonance frequency of the TE mode while basically keeping the resonance frequency of the TM mode unchanged. Therefore, the adjustment convenience and accuracy of the resonance frequency of the TE mode can be improved, and the accurate design of "the resonance frequencies of the HE dual mode, the TE mode and the TM mode are all within the passband range and close to the same frequency band" can be facilitated.

[0092] Moreover, the second annular portion 2114b is connected to the end surface of the medium body 21 facing the ground table 151, which is convenient for designing a mold, facilitating the integrated molding of the medium body 21 and the second annular portion 2114b thereof by the mold, and improving the demolding convenience of the mold after the medium body 21 is molded (demolding can be performed along the axial direction of the medium body 21), thereby improving the molding convenience and accuracy of the medium body 21 and reducing the cost of the mold and the processing cost of the medium body 21.

[0093] Referring to FIG. 15, in some embodiments of the present application, the at least one annular recess 2114 is a third annular portion 2114c formed in the outer circumferential surface of the dielectric body 21, and the third annular portion 2114c is arranged between the two end surfaces of the dielectric body 21. It should be noted that the third annular portion 2114c can be continuous or discontinuous in the circumferential direction as a whole. The third annular portion 2114c is formed in the outer circumferential surface of the dielectric body 21 and is located between the two opposite end surfaces of the dielectric body 21 in the axial direction, that is, in the axial direction of the dielectric body 21, the third annular portion 2114c does not communicate with any end surface of the dielectric body 21, and the third annular portion 2114c is closed on both sides in the axial direction of the dielectric body 21.

[0094] By adopting the above scheme, by forming the third annular portion 2114c in the outer circumferential surface of the dielectric body 21 and arranging the third annular portion 2114c between the two end surfaces of the dielectric body 21, the structure design and layout design of the grounding component 15 can be facilitated, and the design of "the resonant frequency of the HE mode, the resonant frequency of the TE mode, and the resonant frequency of the TM mode are all within the passband range and close to the same frequency band" can be facilitated.

[0095] Further, the third annular portion 2114c is a special form of the third recessed portion 2113, and the third annular portion 2114c has the related utility of the third recessed portion 2113. That is, by opening the third annular portion 2114c on the outer circumferential surface of the medium body 21 and arranging the third annular portion 2114c between the two end surfaces of the medium body 21, the depth direction of the third annular portion 2114c can correspond to the radial direction of the medium body 21, so that the specific area of the medium body 21 can be thinned along the radial direction of the medium body 21, thereby facilitating the controllable and accurate increase of the resonance frequency of the TE mode. Further, since the electric field of the TE mode is more concentrated around the circumferential side of the medium body 21, when the third annular portion 2114c is on the outer circumferential surface of the medium body 21, the third annular portion 2114c has a greater influence on the resonance frequency of the TE mode. Therefore, the third annular portion 2114c can be used to significantly increase the resonance frequency of the TE mode, facilitate the convenient and rapid adjustment of the resonance frequency of the TE mode, increase the range of the resonance frequency of the TE mode that can be increased, and more easily increase the resonance frequency of the TE mode to the required range. At the same time, since the electric field of the TM mode is more concentrated at the central axis L of the medium body 21, based on the arrangement of the present embodiment, the third annular portion 2114c opened on the outer circumferential surface of the medium body 21 can greatly reduce the influence on the resonance frequency of the TM mode, and can facilitate the controllable increase of the resonance frequency of the TE mode while keeping the resonance frequency of the TM mode basically unchanged. Thus, the adjustment convenience and accuracy of the resonance frequency of the TE mode can be improved, and the accurate design of "the resonance frequency of the HE dual mode, the resonance frequency of the TE mode, and the resonance frequency of the TM mode are all within the passband range and close to the same frequency band" can be facilitated.

[0096] In the present application, the above-mentioned embodiments related to the "first annular portion 2114a", "second annular portion 2114b", and "third annular portion 2114c" can be implemented individually, in pairs, or all together. For example, in the embodiment shown in FIG. 10, the medium body 21 can only have the first annular portion 2114a; for example, in the embodiment shown in FIG. 14, the medium body 21 can have both the first annular portion 2114a and the second annular portion 2114b; for example, in the embodiment shown in FIG. 15, the medium body 21 can have both the first annular portion 2114a and the third annular portion 2114c.

[0097] Please refer to FIG. 14, FIG. 15, in some embodiments of the present application, the above-mentioned embodiments of the second annular part 2114b and / or the third annular part 2114c are implemented in combination with the embodiments of the first annular part 2114a. That is, the medium main body 21 is provided with the first annular part 2114a and the second annular part 2114b; or, the medium main body 21 is provided with the first annular part 2114a and the third annular part 2114c; or, the medium main body 21 is provided with the first annular part 2114a, the second annular part 2114b and the third annular part 2114c.

[0098] By adopting the above-mentioned scheme, the grounding component 15 can be facilitated to close the recess communicated by the first annular part 2114a to the end surface of the medium main body 21, and the recess communicated by the second annular part 2114b to the end surface of the medium main body 21 via the grounding platform 151, to be facilitated to close the recess communicated by the second annular part 2114b to the outer circumferential surface of the medium main body 21, and the recess communicated by the third annular part 2114c to the outer circumferential surface of the medium main body 21 via the grounding ring 152, so as to facilitate the structural design and layout design of the grounding component 15, and facilitate the design of “the resonant frequency of the HE dual mode, the resonant frequency of the TE mode, and the resonant frequency of the TM mode all being within the passband range and close to the same frequency band”. Moreover, the resonant frequency of the TE mode can be significantly increased by the second annular part 2114b and / or the third annular part 2114c, while the resonant frequency of the TE mode is also slightly increased by the first annular part 2114a. Based on this, more refined regulation of the resonant frequency of the TE mode can be achieved on the basis of “facilitating convenient and rapid regulation of the resonant frequency of the TE mode, increasing the range of the resonant frequency of the TE mode that can be increased, and more easily increasing the resonant frequency of the TE mode to the required range”. That is, the resonant frequency of the TE mode can be significantly increased to the vicinity of the required range by the second annular part 2114b and / or the third annular part 2114c, and then the resonant frequency of the TE mode can be accurately and slightly increased to the required range by the first annular part 2114a. In this way, more refined regulation of the resonant frequency of the TE mode can be achieved, the resonant frequency of the TE mode can be more accurately, finely and stably increased while the resonant frequency of the TE mode is significantly increased, and the resonant frequency of the TE mode can be more accurately controlled, so as to facilitate accurate design of “the resonant frequency of the HE dual mode, the resonant frequency of the TE mode, and the resonant frequency of the TM mode all being within the passband range and close to the same frequency band”.

[0099] Please refer to FIG. 10, FIG. 3, in some embodiments of the present application, the at least one annular recess 2114 is an annular groove.

[0100] By adopting the above scheme, since the annular groove is continuous annular along the circumferential direction of the annular groove, in the case that the annular groove is closed by the grounding part 15, the annular groove and the grounding part 15 can jointly enclose an air cavity which is complete and continuous annular in the extending path. The air cavity can more significantly further promote the path of most or even all of the electric field of the HE dual mode to be bent around the air cavity and have substantial transmission effect, can significantly reduce the case that the electric field of the HE dual mode directly goes straight from the annular discontinuous part, can greatly extend the electric field path of the HE dual mode, can optimize the lowering effect on the resonant frequency of the HE dual mode, and can obviously 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 in the passband range and close to the same frequency band.

[0101] Of course, in other embodiments, the at least one annular recess 2114 can discontinuously surround the annular shape.

[0102] Please refer to FIG. 2 and FIG. 3. In some embodiments of the present application, the dielectric resonant part 20 includes a dielectric rod 23 arranged on the dielectric main body 21 towards the first plate 11. The dielectric main body 21 is connected to the first plate 11 through the dielectric rod 23.

[0103] It should be noted that the dielectric main body 21 can be provided with the dielectric rod 23 towards the first plate 11. The dielectric main body 21 and the dielectric rod 23 can be integrally connected or separately connected. The dielectric main body 21 can be connected to the first plate 11 through the dielectric rod 23. The dielectric rod 23 can be directly connected and fixed to the first plate 11 by means of welding, bonding, riveting, pressure bonding, screw fastening, threaded connection, clamping, etc., or can be indirectly connected and fixed to the first plate 11 by means of other structures (such as the base 14, an alumina base, other ceramic bases, coupling ribs, metal connecting pieces, etc.). The dielectric rod 23 can be a circular rod, a polygonal rod, a special-shaped rod, or other shapes, and can be a solid rod or a hollow rod.

[0104] By adopting the above scheme, the dielectric resonant part 20 can be additionally provided with the dielectric rod 23, so as to facilitate the connection and fixation of the dielectric main body 21 to the first plate 11 through the dielectric rod 23. Based on this, the assembly convenience between the dielectric main body 21 and the first plate 11 can be improved, and an alumina base or other ceramic base does not need to be additionally arranged between the dielectric main body 21 and the first plate 11, so as to reduce the number of parts and improve the assembly convenience and efficiency of the dielectric cavity resonator. In particular, the dielectric rod 23 and the dielectric main body 21 are both parts of the dielectric resonant part 20, which can facilitate the dielectric rod 23 and the dielectric main body 21 to be integrally formed, and can facilitate the simplification of the assembly process between the dielectric rod 23 and the dielectric main body 21. Moreover, the dielectric rod 23 and the dielectric main body 21 can be made of the same material (such as microwave dielectric ceramic), which can optimize the dielectric properties, so as to improve the overall indicators and performance of the dielectric cavity resonator.

[0105] Of course, in other embodiments, the dielectric resonator 20 can not be provided with the dielectric rod 23.

[0106] Please refer to FIG. 2 and FIG. 3, in some embodiments of the present application, the dielectric body 21 is provided with a recess 211, which is arranged at the outer circumferential side of the dielectric rod 23.

[0107] By using the above scheme, in the case that the dielectric resonator 20 is provided with the dielectric rod 23 and the dielectric body 21 is provided with the recess 211, by arranging the recess 211 at the outer circumferential side of the dielectric rod 23, the recess 211 can be arranged away from the dielectric rod 23. Based on this, the relative layout between the dielectric rod 23 and the recess 211 can be optimized, the mold can be facilitated to design, the dielectric rod 23, the dielectric body 21 and the recess 211 thereof can be facilitated to be integrally formed through the mold, the demolding convenience of the mold after the dielectric resonator 20 is formed can be improved, the forming convenience and forming precision of the dielectric resonator 20 can be improved, and the mold cost and the processing cost of the dielectric resonator 20 can be reduced. Especially, in the case that the dielectric resonator 20 is provided with the dielectric rod 23, the dielectric body 21 is provided with the recess 211, and the recess 211 is communicated to any end surface of the dielectric body 21, the dielectric resonator 20 can be demolded along its axial direction, and the demolding convenience of the mold after the dielectric resonator 20 is formed can be optimized and improved.

[0108] Please refer to FIG. 2, in some embodiments of the present application, the resonator shell 10 includes a bottom platform 14 protruding from the first plate 11, the bottom platform 14 is provided with a positioning groove 141, and the dielectric rod 23 is inserted into the positioning groove 141.

[0109] It should be noted that the bottom platform 14 protrudes from the side of the first plate 11 facing the second plate 12. The bottom platform 14 can be integrally formed on the first plate 11, or can be separately connected to the first plate 11. The shape and size of the bottom platform 14 can be set as needed. The bottom platform 14 can be used to position and install the dielectric resonator 20, and stabilize the installation position and state of the dielectric resonator 20.

[0110] The side of the bottom platform 14 facing the second plate 12 is provided with a positioning groove 141, and the shape, size and depth of the positioning groove 141 can be set as needed. In some embodiments, the depth of the positioning groove 141 is equal to the thickness of the bottom platform 14, so that the combined shape of the bottom platform 14 and the positioning groove 141 is annular.

[0111] The dielectric rod 23 of the dielectric resonator 20 can be positioned and limitedly inserted into the positioning groove 141, so as to be conveniently and quickly stably installed on the bottom platform 14, thereby realizing connection to the first plate 11.

[0112] It should be noted that the magnetic field of the TM mode is horizontally distributed in a ring shape, and the electric field of the TM mode is vertically distributed in a ring shape. Therefore, the bottom base 14 can be used to raise the resonance position of the TM mode.

[0113] By using the above scheme, the dielectric rod 23 of the dielectric resonator 20 can be positioned and limitedly inserted into the positioning groove 141, so that the dielectric resonator 20 can be conveniently and quickly installed stably. Therefore, the assembly convenience and efficiency of the dielectric resonator 20 can be improved, and the assembly efficiency of the dielectric cavity resonator can be improved. In addition, the bottom base 14 and the positioning groove 141 on the bottom base 14 can provide an accurate installation position for the dielectric resonator 20, so as to accurately position the dielectric resonator 20 in the resonator housing 10. Therefore, the performance fluctuation caused by inaccurate installation position of the dielectric resonator 20 can be reduced, and the stability and consistency of the performance of the dielectric cavity resonator can be improved. In addition, the bottom base 14 can raise the resonance position of the TM mode, so as to optimize the resonance characteristics of the TM mode. Therefore, the resonance frequency of the TM mode and the resonance frequency of the TE mode can be in the passband range and close to the same frequency band, which is beneficial to optimize and improve the performance of the dielectric cavity resonator. In addition, based on the assembly mode of "the dielectric rod 23 inserted into the positioning groove 141", the dielectric resonator 20 does not need to be fixed by screws, and the dielectric resonator 20 does not need to be provided with a central hole penetrating along the axis thereof for the screws to pass through. Therefore, the setting of the central hole can basically avoid affecting the resonance frequency of the TM mode, and can reduce the situation that the resonance frequency of the TM mode is significantly increased due to the setting of the central hole, so that the resonance frequency of the TM mode and the resonance frequency of the TE mode are difficult to control.

[0114] Of course, in other embodiments, the bottom base 14 can be omitted, and the dielectric rod 23 can be directly connected to the inner side surface of the first plate 11. For example, the positioning groove 141 can be formed in the inner side surface of the first plate 11, and the dielectric rod 23 can be inserted into the positioning groove 141.

[0115] Please refer to FIG. 2. In some embodiments of the present application, the dielectric rod 23 is welded to the bottom base 14.

[0116] By adopting the above scheme, in the case that the medium rod 23 is inserted into the positioning groove 141, the medium rod 23 can also be completely fixed with the base table 14 via welding. Based on this, the connection stability of the medium resonant piece 20 and the resonator shell 10 can be improved, the installation position and installation state of the medium resonant piece 20 can be stabilized, and the medium resonant piece 20 can stably and reliably function. Moreover, based on the assembly mode of “the medium rod 23 is inserted into the positioning groove 141, and the medium rod 23 is welded with the base table 14”, the medium resonant piece 20 can be fixed without screws, and the medium resonant piece 20 can not be provided with a central hole penetrating along its axis for the screws to pass through. The setting of the central hole can basically avoid causing a greater impact on the resonant frequency of the TM mode, and can reduce the case that 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 caused by the setting of the central hole.

[0117] Of course, in other embodiments, in the case that the medium rod 23 is inserted into the positioning groove 141, the medium rod 23 can be completely fixed with the base table 14 via bonding or the like.

[0118] Please refer to FIG. 2. In some embodiments of the present application, the medium resonant piece 20 is a rotational symmetric structure.

[0119] It should be noted that the medium resonant piece 20 is a rotational symmetric structure around the central axis of the medium resonant piece 20. Specifically, the medium body 21 is a rotational symmetric structure around the central axis of the medium resonant piece 20. The medium column 22 can be provided with one, which is a rotational symmetric structure around the central axis of the medium resonant piece 20; or, the medium column 22 can be provided with multiple, which are rotational symmetric structures around the central axis of the medium resonant piece 20. In the case that the medium resonant piece 20 includes the medium rod 23, the medium rod 23 is a rotational symmetric structure around the central axis of the medium resonant piece 20. In the case that the medium body 21 is provided with the recess 211, the recess 211 is a rotational symmetric structure around the central axis of the medium resonant piece 20. For example, in the case that the recess 211 includes an annular groove, the annular groove is a rotational symmetric structure around the central axis of the medium resonant piece 20, i.e., the annular groove is a circular groove, and the central axis of the annular groove coincides with the central axis of the medium resonant piece 20.

[0120] By adopting the above scheme, by making the dielectric resonant piece 20 a rotationally symmetric structure, the structure, electromagnetic field distribution, etc. of the dielectric resonant piece 20 can be made substantially the same in different directions around the central axis of the dielectric resonant piece 20, without directionality. Based on this, when the dielectric resonant piece 20 is assembled into the resonator shell 10, the assembly angle and limiting problems do not need to be considered, and the assembly can be directly and quickly completed, thereby the assembly convenience and efficiency of the dielectric resonant piece 20 can be improved, and the assembly efficiency of the dielectric cavity resonator can be improved. Moreover, the performance fluctuation caused by inaccurate assembly angle of the dielectric resonant piece 20 can be reduced, and the stability and consistency of the performance of the dielectric cavity resonator can be improved.

[0121] The present embodiment is particularly suitable for being combined with the embodiment that “the resonator shell 10 comprises a bottom base 14 protruding from the first plate piece 11, the bottom base 14 is provided with a positioning groove 141, and the dielectric rod 23 is inserted into the positioning groove 141”, so that the dielectric resonant piece 20 can be directly inserted into the positioning groove 141 of the bottom base 14 without considering the assembly angle, and is simply and quickly installed and fixed.

[0122] Of course, in other embodiments, the dielectric resonant piece 20 can be a non-rotationally symmetric structure.

[0123] Please refer to FIG. 16. In some embodiments of the present application, the dielectric cavity resonator comprises a metal disc 30 and an insulating piece 40, the metal disc 30 is arranged opposite to the dielectric resonant piece 20 along the axial direction of the dielectric resonant piece 20, the metal disc 30 is connected to the second plate piece 12 through the insulating piece 40, and the spacing between the metal disc 30 and the dielectric resonant piece 20 is adjustable, which is used for adjusting the resonant frequency of the TE mode.

[0124] It should be noted that the metal disc 30 is a disc structure, the metal disc 30 can be made of metal material, or the metal disc 30 can be made by covering metal material on the surface of the insulating disc structure. The metal disc 30 can be a circular disc, a polygonal disc or other shapes. Along the axial direction of the dielectric resonant piece 20, the metal disc 30 is arranged opposite to the dielectric resonant piece 20. The metal disc 30 is connected to the second plate piece 12 through the insulating piece 40, so that the metal disc 30 is insulated from the second plate piece 12, the metal disc 30 is not grounded, the metal disc 30 is suspended between the second plate piece 12 and the dielectric resonant piece 20, and the metal disc 30 can compress the magnetic field of the TE mode. The insulating piece 40 can be, but is not limited to, a plastic piece, a plastic piece, a wooden piece, a ceramic piece, a quartz piece, a glass piece, etc.

[0125] In some embodiments, the metal disc 30 can have a through hole, and the insulating piece 40 can be inserted into the through hole to connect the metal disc 30. Of course, in other embodiments, the metal disc 30 can be omitted to set the through hole, and the insulating piece 40 can be connected to the metal disc 30 by means of bonding, welding, clamping, etc.

[0126] The insulating piece 40 is arranged in the second plate piece 12 and can move axially relative to the second plate piece 12 to drive the metal disc 30 to move towards or away from the dielectric resonant piece 20, so as to adjust the distance between the metal disc 30 and the dielectric resonant piece 20. With the decrease of the distance between the metal disc 30 and the dielectric resonant piece 20, the metal disc 30 can enhance the compression effect on the magnetic field of the TE mode, so as to improve the resonant frequency of the TE mode.

[0127] By adopting the above scheme, the distance between the metal disc 30 and the dielectric resonant piece 20 can be conveniently and quickly adjusted by moving the insulating piece 40 axially relative to the second plate piece 12 to drive the ungrounded metal disc 30 to move towards or away from the dielectric resonant piece 20 via the insulating piece 40. Therefore, the resonant frequency of the TE mode can be independently and finely adjusted by adjusting the distance between the metal disc 30 and the dielectric resonant piece 20, so as to realize convenient, quick and accurate tuning. That is, the resonant frequency of the TE mode can be independently tuned by the ungrounded metal disc 30 without affecting the resonant frequency of the TM mode. The smaller the distance between the metal disc 30 and the dielectric resonant piece 20, the higher the resonant frequency of the TE mode, and vice versa. In addition, the resonant frequency of the TE mode can be improved by replacing the metal disc 30 with a larger area to enhance the compression effect of the metal disc 30 on the magnetic field of the TE mode.

[0128] Please refer to FIG. 16. In some embodiments of the present application, the metal disc 30 is in the shape of a circular disc, the outer peripheral wall of the insulating piece 40 is provided with external threads, the insulating piece 40 is connected to the center of the metal disc 30 and is threadedly connected to the second plate piece 12. It should be noted that the metal disc 30 is in the shape of a circular disc, that is, the metal disc 30 is rotationally symmetrical around the central axis. For example, the insulating piece 40 can be an insulating screw or an insulating screw rod, such as a plastic screw or a plastic screw rod. The insulating piece 40 is connected to the center of the metal disc 30, so that the insulating piece 40 and the metal disc 30 are rotationally symmetrical around the central axis of the metal disc 30. The insulating piece 40 is threadedly connected to the second plate piece 12, so as to facilitate the axial movement of the insulating piece 40 relative to the second plate piece 12 by screwing in or out the insulating piece 40. The insulating piece 40 can be directly threadedly connected to the second threaded hole of the second plate piece 12, or the second plate piece 12 can be embedded with a first mounting piece (not shown in the figure), and the insulating piece 40 can be threadedly connected to the threaded hole of the first mounting piece.

[0129] By adopting the above scheme, by making the shape of the metal disc 30 a circular disc, and making the insulating piece 40 connected to the center of the metal disc 30, the insulating piece 40 and the metal disc 30 are both rotationally symmetrical around the central axis of the metal disc 30, which can facilitate the structure of the metal disc 30 and the compression effect on the TE mode magnetic field to be substantially the same in different directions around the central axis of the metal disc 30 and have no directionality. On this basis, by making the insulating piece 40 threadedly connected to the second plate piece 12, the axial movement stroke of the insulating piece 40 can be conveniently and quickly adjusted by screwing in or out the insulating piece 40, so that the metal disc 30 can be conveniently and quickly driven to approach or move away from the dielectric resonator 20, and the spacing between the metal disc 30 and the dielectric resonator 20 can be conveniently and quickly adjusted. And the circular disc has high processing convenience and processing precision. Therefore, the tuning stability, tuning controllability and tuning precision of the resonant frequency of the TE mode can be effectively improved.

[0130] Of course, in other embodiments, the metal disc 30 can be a non-circular disc.

[0131] In other embodiments, the insulating piece 40 can be provided in the second plate piece 12, i.e. the insulating piece 40 and the second plate piece 12 are not threadedly connected. The insulating piece 40 can be directly axially moved relative to the second plate piece 12 to drive the metal disc 30 to approach or move away from the dielectric resonator 20, thereby adjusting the spacing between the metal disc 30 and the dielectric resonator 20. In this case, the second plate piece 12 is provided with a mounting hole, and the insulating piece 40 can be clamped to the mounting hole. For example, the insulating piece 40 is radially deformable, and the insulating piece 40 is fixed to and released from the mounting hole of the second plate piece 12 by deforming in the radial direction thereof, and the axial movement of the insulating piece 40 relative to the second plate piece 12 can be controlled during the operation of fixing and releasing the insulating piece 40 to the mounting hole each time. For another example, the hole wall of the mounting hole is provided with a clamping groove, and the outer peripheral wall of the insulating piece 40 is provided with a plurality of clamping beads spaced apart in the axial direction thereof, and the axial movement of the insulating piece 40 relative to the second plate piece 12 can be achieved by fixing different clamping beads of the insulating piece 40 in the clamping groove.

[0132] Please refer to FIG. 2 and FIG. 16, in some embodiments of the present application, the dielectric cavity resonator comprises an adjusting screw 50, which is threadedly connected to the resonator housing 10 for adjusting the resonant frequency of the TM mode.

[0133] It should be noted that the number of adjusting screws 50 can be one or more. The adjusting screw 50 can be screwed to any plate member (for example, the second plate member 12, the first plate member 11 or other side plate) of the resonator housing 10. The adjusting screw 50 can be directly screwed to a threaded hole formed in the corresponding plate member; or the corresponding plate member can be embedded with a second mounting member (not shown in the figure), and the adjusting screw 50 can be screwed to a threaded hole of the second mounting member. The adjusting screw 50 is grounded based on being connected to the resonator housing 10. The installation position of the adjusting screw 50 is not limited. Along the axial direction of the dielectric resonator 20, the adjusting screw 50 can be arranged in alignment with the dielectric resonator 20 or out of alignment.

[0134] By adopting the above scheme, the length of the part of the adjusting screw 50 extending into the resonator housing 10 can be conveniently adjusted by screwing in or out the adjusting screw 50. Based on this, the electric field of the TM mode can be affected by adjusting the length of the part of the adjusting screw 50 extending into the resonator housing 10, so that the resonant frequency of the TM mode can be independently and finely adjusted, and the tuning is convenient, fast and accurate. That is, the resonant frequency of the TM mode can be independently tuned by the grounded adjusting screw 50, and the resonant frequency of the TE mode is basically not affected. The longer the length of the part of the adjusting screw 50 extending into the resonator housing 10, the lower the resonant frequency of the TM mode; on the contrary, the shorter the length of the part of the adjusting screw 50 extending into the resonator housing 10, the higher the resonant frequency of the TM mode.

[0135] In some embodiments, the adjusting screw 50 is screwed to the second plate member 12. In this way, the tuning effect of the adjusting screw 50 on the resonant frequency of the TM mode can be optimized, and the tuning range of the adjusting screw 50 on the resonant frequency of the TM mode can be expanded. Especially, when the adjusting screw 50 is screwed to the second plate member 12 and the adjusting screw 50 is arranged in alignment with the dielectric resonator 20 along the axial direction of the dielectric resonator 20, the tuning effect of the adjusting screw 50 on the resonant frequency of the TM mode is best.

[0136] Referring to FIG. 1, some embodiments of the present application provide a filter including the dielectric cavity resonator provided by the embodiments of the present application. The filter can have one or more resonators, and the plurality of resonators can be arranged and designed, and a coupling relationship can be established between adjacent two resonators as needed. At least one resonator adopts the dielectric cavity resonator provided by the embodiments of the present application. By adopting the above scheme, the filter can adopt the dielectric cavity resonator provided by the embodiments of the present application to facilitate simulation design and coupling design, optimize the coupling effect between resonators and improve the performance of the filter.

[0137] The above only describes preferred embodiments of the present application and is not used to limit the present application, and any modification, equivalent replacement or improvement made within the spirit and principle of the present application should be included in the protection scope of the present application.

Claims

1. A dielectric cavity resonator, wherein, The resonator shell comprises a first plate and a second plate arranged oppositely; and a dielectric resonator element arranged in the resonator shell, the dielectric resonator element comprising a dielectric body connected to the first plate, and a dielectric column protruding from a side of the dielectric body facing the second plate, the dielectric column being arranged spaced apart from the second plate, the dielectric body being used to determine a resonant frequency of a TE mode, and the dielectric column being used to determine a resonant frequency of a TM mode, so that the resonant frequency of the TE mode and the resonant frequency of the TM mode are in the same frequency band. An axis of the dielectric body passes through the dielectric column along an axial direction of the dielectric body. The dielectric body is provided with a recess.

2. The dielectric cavity resonator of claim 1, wherein, The recess comprises a first recess formed in an end surface of the dielectric body, the first recess being arranged between an outer circumferential surface of the dielectric body and an axis of the dielectric body; 3. The dielectric cavity resonator of claim 1, wherein, and / or, the recess comprises a second recess formed in a peripheral edge of the dielectric body, the second recess being connected to the outer circumferential surface of the dielectric body and at least one end surface of the dielectric body; 4. The dielectric cavity resonator of claim 3 wherein, and / or, the recess comprises a third recess formed in the outer circumferential surface of the dielectric body, the third recess being arranged between two end surfaces of the dielectric body. The resonator shell is provided with a grounding member connected to the first plate, the recess comprises an annular recess, the annular recess being continuous or discontinuous and annular, an axis of the annular recess coinciding with the axis of the dielectric body, a bottom of the annular recess being closed, and the grounding member closing an opening of the annular recess, so that a resonant frequency of a 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. At least one of the annular recesses is a first annular recess formed in an end surface of the dielectric body facing the grounding member, the first annular recess being arranged between the outer circumferential surface of the dielectric body and the axis of the dielectric body.

5. The dielectric resonator of claim 3, wherein, The grounding member comprises a grounding platform arranged on an end side of the dielectric resonator element, and a grounding ring connected to the grounding platform and surrounding an outer periphery of the dielectric resonator element, an end of the dielectric resonator element away from the grounding platform protruding out of the grounding ring.

6. The dielectric resonator of claim 5, wherein, At least one of the annular recesses is a second annular recess formed in a peripheral edge of the dielectric body, the second annular recess being connected to the outer circumferential surface of the dielectric body and an end surface of the dielectric body facing the grounding platform; 7. The dielectric resonator of claim 5, wherein, and / or, at least one of the annular recesses is a third annular recess formed in the outer circumferential surface of the dielectric body, the third annular recess being arranged between two end surfaces of the dielectric body.

8. The dielectric resonator of claim 7, wherein, At least one of the annular recesses is an annular groove. The dielectric resonator element comprises a dielectric rod arranged on a side of the dielectric body facing the first plate, the dielectric body being connected to the first plate through the dielectric rod.

9. The dielectric resonator of claim 5, wherein, The dielectric body is provided with a recess arranged on an outer circumferential side of the dielectric rod.

10. The dielectric cavity resonator of any one of claims 1-9, wherein, The resonator shell comprises a bottom platform protruding from the first plate, the bottom platform being provided with a positioning groove, and the dielectric rod being inserted into the positioning groove.

11. The dielectric resonator of claim 10, wherein, The dielectric rod is welded to the bottom platform.

12. The dielectric resonator of claim 10, wherein, The dielectric resonator element has a rotational symmetry.

13. The dielectric resonator of claim 12, wherein, ​ 14. The dielectric cavity resonator of any one of claims 1-9, wherein, ​ 15. The dielectric cavity resonator of any one of claims 1-9, wherein, The dielectric cavity resonator comprises a metal disc and an insulating piece, the metal disc is arranged opposite to the dielectric resonator along the axial direction of the dielectric resonator, the metal disc is connected to the second plate through the insulating piece, and the distance between the metal disc and the dielectric resonator is adjustable to adjust the resonant frequency of the TE mode.

16. The dielectric resonator of claim 15, wherein, The metal disc is in the shape of a circular disc, the outer peripheral wall of the insulating piece is provided with external threads, the insulating piece is connected to the center of the metal disc and is threadedly connected to the second plate.

17. A filter, wherein, The dielectric cavity resonator as claimed in any one of claims 1-16.

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