Dielectric resonator

Abstract

The application discloses a dielectric resonator, comprising: a cavity; a cover plate, comprising a first cover plate and a second cover plate, the second cover plate being crimped on the first cover plate; a tuning screw being installed on the cover plate; a metal resonant rod being fixed on the bottom of the cavity; a dielectric resonant rod having an upper end surface and a lower end surface, the upper end surface being in contact with the first cover plate, and the lower end surface being in contact with the metal resonant rod; the first cover plate having a first opening, a first slot portion and a second slot portion, the first slot portion being located radially outside the first opening and axially above the dielectric resonant rod, an elastic member being arranged in the first slot portion, and the second slot portion being located radially outside the first slot portion. The dielectric resonator adopts a double-layer thick cover plate, and through designing an inner and outer double-cut slot structure on the first cover plate, the upper and lower end surfaces of the dielectric resonant rod are kept in good contact in a simple and controllable structure.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of wireless network communication, and in particular to a dielectric resonator. BACKGROUND

[0002] The resonator is one of the main elements of a filter. In order to ensure that the dielectric resonator rod, the metal resonator rod and the cover plate in the resonator are in good contact with each other, a thin shielding cover plate and a thick crimping cover plate are used in the prior art. An elastic member is placed between the lower shielding cover plate and the upper crimping cover plate, or the shielding cover plate is further stretched to form a recess structure to place the elastic member, or the crimping cover plate is further locally milled to place the elastic member. The elastic member generates elastic force to deform the lower shielding cover plate downward, so as to ensure that the dielectric resonator rod is in good contact with the shielding cover plate. However, since the lower shielding cover plate is a thin cover plate, the deformation area is not controlled, and the area where the cavity is suspended may be deformed, which is not consistent and cannot be mass-produced. In addition, the shielding cover plate is relatively thin, and the required thread length of the tuning screw is insufficient. Therefore, the tuning screw can only be placed on the upper thick crimping cover plate. The signal is easily leaked between the two cover plates, and the elastic member between the two cover plates may cause the risk of poor intermodulation index. Both the double-layer cover plates need to cover the entire cavity opening, which is high in cost.

[0003] Therefore, it is necessary to provide a new dielectric resonator to solve the above problems. SUMMARY

[0004] The present application aims to provide a dielectric resonator which has a simple and controllable structure to play a role of stress buffering and deformation transition, and has good shielding performance and low cost.

[0005] To achieve the above-mentioned purpose, the present application adopts the following technical solutions:

[0006] A dielectric resonator comprises:

[0007] A cavity having an upper opening;

[0008] A cover plate comprising a first cover plate and a second cover plate, the first cover plate covering the upper opening, and the second cover plate being crimped on the first cover plate;

[0009] A tuning screw installed on the cover plate;

[0010] A metal resonator rod fixed to the bottom of the cavity;

[0011] A dielectric resonator rod having an upper end surface and a lower end surface, the upper end surface being in contact with the first cover plate, and the lower end surface being in contact with the metal resonator rod;

[0012] The first cover plate has a first opening, a first groove and a second groove, the first groove is located on the radial outer side of the first opening and above the axial direction of the medium resonance rod, the first groove is provided with an elastic member, and the second groove is located on the radial outer side of the first groove.

[0013] As a further improved technical solution of the application, the first cover plate has an upper surface and a lower surface, the upper surface is at least partially in contact with the second cover plate, and the lower surface is at least partially in contact with the upper end surface.

[0014] The second cover plate has a second opening, the tuning screw passes through the first opening and the second opening, and the aperture diameter of the second opening is greater than or equal to the aperture diameter of the first opening.

[0015] As a further improved technical solution of the application, the first groove and the medium resonance rod at least partially overlap in the axial direction.

[0016] As a further improved technical solution of the application, the first groove is recessed from the upper surface to the lower surface and does not exceed the lower surface.

[0017] As a further improved technical solution of the application, the second groove is recessed from the lower surface to the upper surface and does not exceed the upper surface.

[0018] Or the second groove is recessed from the upper surface to the lower surface and does not exceed the lower surface.

[0019] As a further improved technical solution of the application, the radial width of the first groove is greater than the radial width of the second groove.

[0020] As a further improved technical solution of the application, the outer diameter of the second cover plate is greater than or equal to the outer diameter of the medium resonance rod.

[0021] As a further improved technical solution of the application, the elastic member is silica gel filled with nickel or carbon.

[0022] The elastic member is integrally connected with the first cover plate, or the elastic member is integrally connected with the second cover plate.

[0023] As a further improved technical solution of the application, in a natural state, the axial height of the first groove is equal to or less than the axial height of the elastic member.

[0024] As a further improved technical solution of the application, the metal resonance rod is fixedly connected with the cavity through a screw;

[0025] Or the metal resonance rod is welded to the cavity.

[0026] Alternatively, the metal resonant rod and the cavity may be an integrated structure.

[0027] As a further improvement of the present invention, the thickness of the first cover plate is greater than or equal to the thickness of the second cover plate.

[0028] As a further improvement of the present invention, the diameter of the first opening is adapted to the tuning screw.

[0029] Compared to existing technologies, the advantages of the dielectric resonator of this invention are as follows: It employs a double-layer thick cover plate. By designing an inner and outer double-groove structure on the lower layer (the first cover plate, which serves as a shielding cover), two deformation areas are formed. The inner first groove experiences significant stress during compression deformation, while the outer second groove effectively buffers stress and facilitates deformation transition, ensuring surface contact between the dielectric resonator rod and the cover plate. The position and width of the double-groove structure can be designed and controlled according to actual needs. Furthermore, the upper second cover plate only needs to correspond to the dielectric resonator rod axially, while the remaining areas only require a single layer of the first cover plate, reducing overall cost. The thickness of the first cover plate is sufficient to meet the thread length requirements of the tuning screw, allowing the tuning screw to be placed directly on it. The signal is completely shielded within the cavity by the first cover plate, eliminating any additional performance risks. This dielectric resonator maintains good contact between the upper and lower end faces of the dielectric resonator rod with a simple and controllable structure, and offers advantages such as good shielding and low cost. Attached Figure Description

[0030] Figure 1 This is a cross-sectional structural diagram of a dielectric resonator according to a specific embodiment of the present invention;

[0031] Figure 2 This is an exploded structural diagram of the cover plate and elastic element according to a specific embodiment of the present invention;

[0032] Figure 3 This is a three-dimensional structural diagram of the first cover plate according to a specific embodiment of the present invention;

[0033] Figure 4 This is a cross-sectional structural diagram of a dielectric resonator according to a specific embodiment of the present invention;

[0034] Figure 5 This is a cross-sectional structural diagram of a dielectric resonator according to a specific embodiment of the present invention;

[0035] Figure 6 This is a three-dimensional structural diagram of a dielectric resonator according to a specific embodiment of the present invention. Detailed Implementation

[0036] The exemplary embodiments of the present invention will now be described in detail with reference to the accompanying drawings. If several embodiments exist, features in these embodiments may be combined with each other without conflict. When the description refers to the drawings, unless otherwise stated, the same numbers in different drawings represent the same or similar elements. The descriptions in the following exemplary embodiments do not represent all embodiments consistent with the present invention; rather, they are merely examples of apparatuses, products, and / or methods consistent with some aspects of the present invention as set forth in the claims.

[0037] The terminology used in this invention is for the purpose of describing particular embodiments only and is not intended to limit the scope of protection of this invention. The singular forms “a,” “the,” or “the” as used in the specification and claims of this invention are also intended to include the plural forms unless the context clearly indicates otherwise.

[0038] It should be understood that the terms "first," "second," and similar words used in the specification and claims of this invention do not indicate any order, quantity, or importance, but are merely used to distinguish features. Similarly, the terms "an" or "a" do not indicate a quantity limitation, but rather indicate the presence of at least one. Unless otherwise stated, the terms "before," "after," "upper," "lower," and similar words appearing in this invention are for ease of explanation only and are not limited to a specific location or spatial orientation. The terms "comprising" or "including" are an open-ended expression, meaning that the element preceding "comprising" or "including" encompasses the element following "comprising" or "including" and its equivalents, but this does not preclude the element preceding "comprising" or "including" from also including other elements. In this invention, the term "several" means two or more.

[0039] Please see Figures 1 to 6 As shown in the figure, an embodiment of the present invention discloses a dielectric resonator, including a cavity 1, a cover plate 2, a tuning screw 3, a metal resonant rod 4, and a dielectric resonant rod 5. The cover plate 2 is fixed on the cavity 1, the metal resonant rod 4 is fixed on the bottom of the cavity 1, the dielectric resonant rod 5 is installed between the cover plate 2 and the metal resonant rod 4, and the tuning screw 3 is installed on the cover plate 2.

[0040] The cavity 1 has an upper opening 11 and only one opening. A cover plate 2 covers the upper opening 11 and can be fixed to the cavity 1 with screws. The dielectric resonator 5 has an upper end face 51 and a lower end face 52. The upper end face 51 contacts the cover plate 2, and the lower end face 52 contacts the metal resonator 4. Both the metal resonator 4 and the dielectric resonator 5 are hollow structures. The metal resonator 4 has a first channel 41, and the dielectric resonator 5 has a second channel 53. The first channel 41 and the second channel 53 are axially corresponding and connected. The tuning screw 3 and the nut 7 are fitted onto the cover plate 2, giving the cavity 1 good sealing performance. Furthermore, the tuning screw 3 is at least partially located outside the cavity 1, and the nut 7 is tightly attached to the cover plate 2 outside the cavity 1. The tuning screw 3 is at least partially located outside the nut 7.

[0041] Please see Figure 1 and Figure 2 As shown, the cover plate 2 includes a first cover plate 21 and a second cover plate 22. The first cover plate 21 covers the upper opening 11, and the second cover plate 22 is pressed onto the first cover plate 21. The first cover plate 21 has a first opening 211, and the second cover plate 22 has a second opening 221. The second opening 221, the first opening 211, the second channel 53, and the first channel 41 are coaxial and connected. The tuning screw 3 passes through the first opening 211 and the second opening 221. The first opening 211 has an internal thread that matches the external thread of the tuning screw 3 to increase the contact area between the first cover plate 21 and the tuning screw 3, ensuring good contact between them. The tuning screw 3 passes through the second opening 221 and the first opening 211 and extends into the second channel 53, thereby making the radio frequency parameters of the dielectric resonator adjustable.

[0042] Furthermore, the thickness of the first cover plate 21 is greater than or equal to the thickness of the second cover plate 22. Both the first cover plate 21 and the second cover plate 22 are thick cover plates. The first cover plate 21 serves as a shielding cover plate, and the second cover plate 22 serves as a pressing cover plate. In this way, the first cover plate 21 is a thick cover plate, and its thickness is sufficient to meet the thread length requirements of the tuning screw 3. The tuning screw 3 can be directly placed on the first cover plate 21, and the signal is completely shielded by the first cover plate 21 within the cavity 1, without any additional performance risks.

[0043] In some embodiments, the diameter of the second opening 221 is larger than the diameter of the first opening 211. The tuning screw 3 and the nut 7 are fitted together and installed on the first cover plate 21. At this time, the nut 7 is close to the first cover plate 21 and the nut 7 is at least partially located in the second opening 221.

[0044] In other embodiments, the diameter of the second opening 221 is equal to the diameter of the first opening 211, and the second opening 221 has the same internal thread as the first opening 211, which matches the external thread of the tuning screw 3. The tuning screw 3 and the nut 7 are fitted together and installed on the second cover plate 22, at which time the nut 7 is set tightly against the second cover plate 22.

[0045] Please see Figure 1 and Figure 4 As shown, a boss 12 is provided at the bottom of the cavity 1 to facilitate the positioning and installation of the metal resonant rod 4. The metal resonant rod 4 is fixed to the boss 12 by screws or directly welded to the cavity 1. Furthermore, the boss 12 is provided with a positioning protrusion 121, which is adapted to the first channel 41. The first channel 41 engages with the positioning protrusion 121 to limit the position of the metal resonant rod 4, and can be further reinforced by welding.

[0046] Please see Figure 1 and Figure 4 As shown, the metal resonant rod 4 includes a rod portion 42 and a ring portion 43. The outer diameter of the ring portion 43 is larger than the outer diameter of the rod portion 42, and the lower end face 52 of the dielectric resonant rod 5 contacts the ring portion 43. Further, the outer diameter of the ring portion 43 is greater than or equal to the outer diameter of the dielectric resonant rod 5 to ensure complete contact between the lower end face 52 of the dielectric resonant rod 5 and the ring portion 43 of the metal resonant rod 4. Even further, the outer and inner diameters of the dielectric resonant rod 5 are respectively equivalent to the outer and inner diameters of the ring portion 43, and the first cover plate 21 covers the entire upper opening 11 of the cavity 1, so that the upper end face 51 and the lower end face 52 of the dielectric resonant rod 5 can fully contact the cover plate 2 and the ring portion 43 respectively.

[0047] Please see Figure 5 As shown, in another embodiment, the metal resonant rod 4 and the cavity 1 are integrated into a single structure. Both the cavity 1 and the metal resonant rod 4 are made of metal. Making them into an integrated structure can simplify the assembly process of the dielectric resonator.

[0048] Please see Figure 1As shown, the first cover plate 21 also has a first groove 212 and a second groove 213. The first groove 212 is located radially outside the first opening 211 and axially above the dielectric resonator rod 5. The second groove 213 is located radially outside the first groove 212. An elastic element 6 is provided inside the first groove 212. Further, the first groove 212 and the dielectric resonator rod 5 overlap at least partially in the axial direction, and even further, the overlapping part is larger than the non-overlapping part. The function of the first groove 212 and the elastic element 6 is that when the dielectric resonator rod 5 forms an interference contact between the first cover plate 21 and the metal resonator rod 4, the metal resonator rod 4 exerts upward pressure on the dielectric resonator rod 5, and the pressure is then transmitted upward to the first cover plate 21. The elastic element 6 and the first groove 212 between the first cover plate 21 and the second cover plate 22 form a certain elastic deformation, and at the same time generate a downward elastic force, so that the contact between the first cover plate 21, the dielectric resonator rod 5 and the metal resonator rod 4 is always continuous and stable. However, when the first groove 212 of the first cover plate 21 and the elastic element 6 deform, there will be a large stress. If there is only this deformation area, it is easy to cause stress concentration and insufficient deformation, resulting in point contact or line contact during actual contact. Therefore, the second groove 213 is provided, which can effectively play the role of stress buffering and deformation transition, ensuring that the contact between the dielectric resonator rod 5 and the first cover plate 21 is surface contact.

[0049] The first cover plate 21 has an upper surface 21a and a lower surface 21b, wherein the upper surface 21a is at least partially in contact with the second cover plate 22, and the lower surface 21b is at least partially in contact with the upper end face 51.

[0050] Please see Figure 1 and Figure 5 As shown, in some embodiments, the first groove 212 is recessed from the upper surface 21a toward the lower surface 21b and does not extend beyond the lower surface 21b; the second groove 212 is recessed from the lower surface 21b toward the upper surface 21a and does not extend beyond the upper surface 21a.

[0051] Please see Figure 4 As shown, in other embodiments, the first groove 212 is recessed from the upper surface 21a toward the lower surface 21b and does not extend beyond the lower surface 21b; the second groove 212 is recessed from the upper surface 21a toward the lower surface 21b and does not extend beyond the lower surface 21b.

[0052] In some embodiments, the radial width of the first groove 212 is greater than the radial width of the second groove 213. The first groove 212 and the elastic member 6 serve as the main deformation area, while the second groove 213 serves as a secondary buffer deformation area. Of course, this embodiment does not limit the radial width of the first groove 212 and the second groove 213. In practical applications, the position and width of the first groove 212 and the second groove 213 can be designed and controlled as needed.

[0053] In this embodiment, since the thickness of the first cover plate 21 is sufficient to meet the thread length requirement of the tuning screw 3, the signal is completely shielded within the cavity 1 by the first cover plate 21. A single layer of the first cover plate 21 is sufficient to meet the shielding requirements of the dielectric resonator. Therefore, the second cover plate 22 only needs to correspond axially to the dielectric resonator rod 5 or the first groove 212; the remaining areas only require a single layer of the first cover plate 21. Thus, from the axial perspective of the entire dielectric resonator, the area of ​​the dielectric resonator rod 5 or the first groove 212 is smaller, while the remaining areas are larger. The former covers the double-layer cover plate 2, i.e., the first cover plate 21 and the second cover plate 22, while the latter only needs to cover a single-layer cover plate 2, i.e., the first cover plate 21. In some embodiments, the area requiring coverage of the double-layer cover plate 2 accounts for only about one-sixth of the total area. Therefore, the total cost of the cover plate 2 is reduced.

[0054] The first cover plate 21 is fixedly connected to the cavity 1, and the second cover plate 22 is fixedly connected to the first cover plate 21. It can be fixed by screws. When it is necessary to replace the dielectric resonator rod 5, the first cover plate 21 and the second cover plate 22 can be opened directly to take out the dielectric resonator rod 5 for replacement.

[0055] In this embodiment, cavity 1 is a metal cavity, and dielectric resonator 5 is a ceramic dielectric resonator, whose upper end face 51 and lower end face 52 can be covered by a conductive material. In some embodiments, the conductive material can be a metal capable of conducting electricity, such as gold, silver, or copper; in other embodiments, the conductive material can also be a non-metal capable of conducting electricity.

[0056] Furthermore, in its natural state, i.e., when the cover plate 2, the metal resonator 4, and the dielectric resonator 5 are not deformed or subjected to pressure, the axial height of the first groove 212 is equal to or less than the axial height of the elastic element 6. This ensures that the dielectric resonator 5 is tightly fixed between the cover plate 2 and the top of the metal resonator 4, and guarantees full contact among the three components.

[0057] In some embodiments, the elastic element 6 may be a silicone elastic ring, or an elastic pad, spring, etc., which is placed in the first groove 212 and then the first cover plate 21 and the second cover plate 22 are fixed.

[0058] Please see Figure 3 As shown, in some embodiments, the elastic element 6 is silicone filled with nickel or carbon, and the elastic element 6 is integrally connected to the first cover plate 21 or the second cover plate 22. Furthermore, the silicone filled with nickel or carbon can be arbitrarily dotted into the first groove 212 or onto the surface of the second cover plate 22, so that the elastic element 6 and the cover plate 2 form an integrated structure, avoiding secondary assembly and simplifying the assembly process.

[0059] Please see Figures 1 to 6As shown, the dielectric resonator in this embodiment is in a closed state, with only the nut 7 and part of the tuning screw 3 exposed to the outside, which facilitates the adjustment of the radio frequency parameters of the dielectric resonator.

[0060] The dielectric resonator of this embodiment can be applied to radio frequency communication devices or signal processing devices such as filters, duplexers, combiners, transmitters, and tower-top amplifiers.

[0061] In summary, compared with existing technologies, the dielectric resonator of this invention has the following advantages: It employs a double-layer thick cover plate. By designing an inner and outer double-groove structure on the lower cover plate 21, which serves as a shielding cover plate, two deformation areas are formed. The inner first groove 212 experiences significant stress during compression deformation, while the outer second groove 213 effectively buffers stress and facilitates deformation transition, ensuring surface contact between the dielectric resonator rod 5 and the cover plate 2. The position and width of the double-groove structure can be designed and controlled according to actual needs. Furthermore, the upper second cover plate 22 only needs to correspond to the dielectric resonator rod 5 axially, while the remaining areas only require a single layer of the first cover plate 21, reducing overall cost. The thickness of the first cover plate 21 is sufficient to meet the thread length requirements of the tuning screw 3, allowing the tuning screw 3 to be placed directly on the first cover plate 21. The signal is completely shielded within the cavity 1 by the first cover plate 21, eliminating additional performance risks. This dielectric resonator maintains good contact between the upper and lower end faces of the dielectric resonator rod 5 with a simple and controllable structure, and also offers advantages such as good shielding and low cost.

[0062] The above embodiments are only used to illustrate the present invention and are not intended to limit the technical solutions described in the present invention. The understanding of this specification should be based on those skilled in the art. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art should understand that they can still make modifications or equivalent substitutions to the present invention. All technical solutions and improvements that do not depart from the spirit and scope of the present invention should be covered within the scope of the claims of the present invention.

Claims

1. A dielectric resonator, comprising: The cavity (1) has an upper opening (11). The cover plate (2) includes a first cover plate (21) and a second cover plate (22), wherein the first cover plate (21) covers the upper opening (11) and the second cover plate (22) is pressed onto the first cover plate (21); Tuning screw (3) is installed on the cover plate (2); A metal resonant rod (4) is fixed to the bottom of the cavity (1); The dielectric resonator (5) has an upper end face (51) and a lower end face (52), the upper end face (51) is in contact with the first cover plate (21), and the lower end face (52) is in contact with the metal resonator (4); Its features are: The first cover plate (21) has a first opening (211), a first groove (212) and a second groove (213). The first groove (212) is located radially outside the first opening (211) and axially above the dielectric resonator rod (5). An elastic element (6) is provided in the first groove (212). The second groove (213) is located radially outside the first groove (212). The first groove (212) and the dielectric resonator rod (5) overlap at least partially in the axial direction. The second cover plate (22) is at least partially axially aligned with the dielectric resonator rod (5) or the first groove (212).

2. The dielectric resonator according to claim 1, characterized in that: The first cover plate (21) has an upper surface (21a) and a lower surface (21b), the upper surface (21a) being at least partially in contact with the second cover plate (22), and the lower surface (21b) being at least partially in contact with the upper end face (51); The second cover plate (22) has a second opening (221), and the tuning screw (3) passes through the first opening (211) and the second opening (221). The diameter of the second opening (221) is greater than or equal to the diameter of the first opening (211).

3. The dielectric resonator according to claim 2, characterized in that: The first groove (212) is recessed from the upper surface (21a) toward the lower surface (21b) and does not extend beyond the lower surface (21b).

4. The dielectric resonator according to claim 3, characterized in that: The second groove (213) is recessed from the lower surface (21b) toward the upper surface (21a) and does not extend beyond the upper surface (21a). Alternatively, the second groove (213) is recessed from the upper surface (21a) toward the lower surface (21b) and does not extend beyond the lower surface (21b).

5. The dielectric resonator according to claim 1, characterized in that: The radial width of the first groove (212) is greater than the radial width of the second groove (213).

6. The dielectric resonator according to claim 1, characterized in that: The outer diameter of the second cover plate (22) is greater than or equal to the outer diameter of the dielectric resonator rod (5).

7. The dielectric resonator according to claim 1, characterized in that: The elastic element (6) is silicone filled with nickel or carbon; The elastic element (6) is integrally connected to the first cover plate (21), or the elastic element (6) is integrally connected to the second cover plate (22).

8. The dielectric resonator according to claim 1, characterized in that: In its natural state, the axial height of the first groove (212) is equal to or less than the axial height of the elastic member (6).

9. The dielectric resonator according to claim 1, characterized in that: The metal resonant rod (4) is fixedly connected to the cavity (1) by screws; Alternatively, the metal resonant rod (4) may be welded and fixed to the cavity (1); Alternatively, the metal resonator (4) and the cavity (1) may be an integrated structure.

10. The dielectric resonator according to claim 1, characterized in that: The thickness of the first cover plate (21) is greater than or equal to the thickness of the second cover plate (22).

11. The dielectric resonator according to claim 2, characterized in that: The diameter of the first opening (211) is adapted to the tuning screw (3).

Images