Dielectric loading coaxial resonator with screw cap structure and filter

Abstract

The invention belongs to the field of microwave devices, and discloses a dielectric loading coaxial resonator with a screw cap structure, which comprises a shell provided with a screw cap mounting part and internally provided with a resonant cavity; the resonant part is arranged in the resonant cavity and comprises an open circuit end and a grounding end which are oppositely arranged, and the grounding end is connected with the resonant cavity; the first dielectric piece is arranged on the open-circuit end of the resonance piece, the upper and lower end faces of the first dielectric piece are both silvered, the first dielectric piece comprises a second silvered surface and a first silvered surface, a first dielectric inner hole is formed in the center of the first dielectric piece, and the first silvered surface is connected with the open-circuit end; the screw cap is screwed on the screw cap mounting part and is provided with a screw cap internal threaded hole, the bottom of the screw cap is connected with the second silvered surface, and a capacitor is formed between the screw cap and the open circuit end; the adjusting part is screwed in the inner threaded hole of the screw cap, the lower end of the adjusting part extends into the first medium inner hole, and the adjusting part, the resonance part, the first medium part and the screw cap are coaxially arranged; the probing depth of the adjusting piece is adjusted, and the capacitance value of the capacitor between the open circuit end and the screw cap is changed, so that the resonant frequency of the resonator is adjusted.

Description

Technical Field

[0001] This invention belongs to the field of microwave device technology, and mainly relates to a dielectric-loaded coaxial resonator and filter with a screw cap structure. Background Technology

[0002] A coaxial cavity filter resonator typically includes a cavity, a cover plate mounted on the cavity, a resonant rod mounted inside the cavity, and a tuning screw on the cover plate. The resonant frequency of the resonator is adjusted by changing the depth of the tuning screw inserted into the inner hole of the resonant rod. However, this conventional type of cavity filter can no longer adequately meet the overall system design requirements in many application scenarios, especially when facing the requirements of small size, high power, and low loss for RF front-end filters.

[0003] To address the above requirements, a common solution is to load a circular ceramic dielectric ring between the open-circuit end of the resonant rod and the cover plate. This ring-shaped ceramic dielectric ring is silver-coated on both sides, forming the upper and lower electrodes of a dielectric capacitor. The dielectric material is selected as a ceramic material with high dielectric constant, low dielectric loss, and low temperature coefficient. The introduction of this dielectric ceramic capacitor can significantly increase the capacitance value in the resonant circuit, while the inductance of the resonant rod in the resonant circuit can be significantly reduced. Therefore, loading a dielectric ceramic capacitor onto a coaxial resonator can effectively solve the above requirements.

[0004] Currently, ceramic capacitor loading methods are divided into two types: welded and non-welded. Among them, the non-welded ceramic capacitor loading method is mostly a direct pressing method of the cover plate. The problems with this pressing method are: ① There are machining and assembly tolerances in the installation height of the filter resonator rod; ② There are verticality tolerances in the resonator rod plate; and the above tolerances cannot be completely avoided, resulting in poor cover plate pressing and a decrease in filter technical indicators, especially key technical requirements such as power capacity and long-term reliability. Summary of the Invention

[0005] To address the problems in the prior art, this invention proposes a dielectric-loaded coaxial resonator and filter with a screw-cap structure. This solves the technical problems of insufficient tightness and uneven pressure of the cap, significantly reducing the volume of the cavity filter while significantly improving the power capacity and operational stability of the filter, giving it high Q value, high power density, and high reliability.

[0006] To achieve the above objectives, the present invention first provides a dielectric-loaded coaxial resonator with a screw-cap structure, which is implemented through the following technical solution:

[0007] A dielectric-loaded coaxial resonator with a screw-cap structure, comprising:

[0008] The housing has a screw-on mounting part and an internal resonant cavity;

[0009] A resonant element, disposed within the resonant cavity, includes an open-circuit terminal and a ground terminal disposed opposite to each other, the ground terminal being connected to the resonant cavity;

[0010] The first dielectric element is disposed on the open end of the resonator. Its upper and lower end faces are silvered, forming a second silvered surface and a first silvered surface. A first dielectric inner hole is provided in its center, and the first silvered surface is connected to the open end.

[0011] A screw cap is screwed onto the screw cap mounting position and has an internal threaded hole. The bottom of the screw cap is connected to the second silver-plated surface, and a capacitor is formed between the screw cap and the open terminal.

[0012] And the adjusting component, which is screwed into the threaded hole of the cap, with its lower end protruding into the inner hole of the first dielectric. The adjusting component, the resonant component, the first dielectric component, and the cap are all coaxially arranged.

[0013] Adjusting the insertion depth of the adjusting element changes the capacitance value between the open end and the screw cap, thereby adjusting the resonant frequency of the resonator.

[0014] Furthermore, a second metal gasket is provided between the screw cap and the second silvered surface, and a first metal gasket is provided between the open end of the resonator and the first silvered surface, in order to enhance the metal electrical interconnection and protect the silvered surface.

[0015] Furthermore, it also includes a second dielectric element, the upper end of which is connected to the screw cap. The open end of the resonator is provided with a resonant rod inner hole for accommodating the second dielectric element. The lower end of the second dielectric element is sequentially inserted into the inner hole of the first dielectric element and the inner hole of the resonant rod. The second dielectric element, the first dielectric element, and the resonator are coaxially mounted.

[0016] Furthermore, the second dielectric element has a central hole for inserting an adjustment element, and an adjustment gap is provided between the inner hole of the second dielectric element and the adjustment rod; a clearance gap is provided between the second dielectric element and the resonator.

[0017] Furthermore, the bottom of the cap is provided with a cap limiting hole, and the upper end surface of the second medium is provided with a second medium limiting step that matches the cap limiting hole.

[0018] Furthermore, the first dielectric element has a T-shaped structure, and a first dielectric element step is provided on the outer edge of its upper end face.

[0019] Furthermore, the cap is also provided with a screw hole and a probe hole, which are arranged vertically and connected to each other.

[0020] Furthermore, the adjusting component includes an adjusting rod and an adjusting limiting boss disposed on the adjusting rod, and the adjusting rod is provided with an adjusting rod thread for matching the internal threaded hole of the cap.

[0021] Furthermore, the outer diameter of the open-circuit end of the resonator is larger than the outer diameter of the first silvered surface of the first dielectric element.

[0022] Secondly, the present invention also provides a filter comprising the aforementioned dielectric-loaded coaxial resonator with a screw cap structure.

[0023] Compared with the prior art, the present invention has the following beneficial effects:

[0024] This invention provides a dielectric-loaded coaxial resonator and filter with a screw-top structure. By setting a screw-top and an adjustment component, the technical problems of insufficient tightness of the cover plate and uneven pressure are solved. By adjusting the depth of the adjustment component, the capacitance value between the open end of the resonator and the bottom surface of the screw-top is adjusted, thereby achieving the purpose of adjusting the resonator's resonant frequency. Attached Figure Description

[0025] Figure 1 This is a schematic diagram of the external structure of an embodiment of the present invention.

[0026] Figure 2 for Figure 1 A cross-sectional view along the AA direction.

[0027] Figure 3 for Figure 1 A schematic diagram of the exploded structure of a resonator.

[0028] Figure 4 This is a cross-sectional view of an embodiment of the present invention.

[0029] Wherein: 100, resonator; 101, resonant cavity; 102, screw cap threaded hole; 111, screw cap mounting position; 112, resonator mounting post;

[0030] 10. Shell; 11. Cover plate; 12. Cavity;

[0031] 20. Resonant component; 201. Open circuit terminal; 202. Grounding terminal; 203. Inner hole of resonant rod;

[0032] 30. First dielectric element; 301. First silvered surface; 302. Second silvered surface; 303. Inner hole of the first dielectric element; 304. Step of the first dielectric element;

[0033] 40. Second dielectric element; 401. Step of the second dielectric element; 402. Inner hole of the second dielectric element;

[0034] 50. Screw cap; 501. External thread of screw cap; 502. Screw hole; 503. Probe hole; 504. Internal thread hole of screw cap; 505. Limiting hole of screw cap; 506. Bottom boss of screw cap;

[0035] 60. Adjusting component; 601. Adjusting limit boss; 602. Adjusting rod;

[0036] 701, First metal gasket; 702, Second metal gasket;

[0037] 1001. Debugging interval;

[0038] 1002. Clearance. Detailed Implementation

[0039] The preferred embodiments of the present invention will now be described in detail with reference to the accompanying drawings. Examples of the embodiments are shown in the drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the present application, and should not be construed as limiting the present application. In the description of the present application, it should be understood that the terms "depth," "length," "upper," "lower," "top," "bottom," "inner," "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as limiting the present application.

[0040] In this application, unless otherwise expressly specified and limited, the terms "installation," "assembly," "interconnection," "connection," "fixation," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0041] like Figures 1-4 As shown, a dielectric-loaded coaxial resonator with a screw cap structure is used in a filter. It includes: a housing 10, a resonator 20, a first dielectric element 30, a second dielectric element 40, a screw cap 50, an adjusting element 60, a first metal gasket 701, and a second metal gasket 702; the resonator 20, the first dielectric element 30, the second dielectric element 40, the screw cap 50, the adjusting element 60, the first metal gasket 701, and the second metal gasket 702 are all arranged coaxially.

[0042] The housing 10 has a resonant cavity 101 inside, and a resonant mounting post 112 for mounting the resonant 20 is provided inside the resonant cavity 101. The housing 10 has a screw cap mounting part 111, and the screw cap mounting part 111 has a housing screw cap threaded hole 102 for threaded connection with the screw cap 50.

[0043] It should be noted that any structure capable of forming a resonant cavity 101 internally can be considered a housing 10, and can be assembled from two or more components. For example, it can be assembled from a cavity and a cover plate, such as... Figure 1 and Figure 4 As shown, it can also be composed of two cavities fastened together, but is not limited to this; the screw cap mounting part 111 is part of the housing 10, or it can be any part of the housing 10, such as the bottom wall or side wall of the housing 10, but is not limited to this; in addition, the resonator mounting post 112 can be omitted, and the resonator 20 can be directly mounted on the inner wall of the resonator cavity 101.

[0044] In this embodiment, the housing 10 is exemplified by the cover plate 11 and the cavity 12: as shown Figures 1-3 As shown, the screw cap mounting part 111 is disposed on the cover plate 11, and the resonator mounting post 112 is disposed at the bottom of the cavity 12; alternatively, it can be as follows: Figure 4 As shown, it is similar to Figure 1 The main difference is that the screw cap mounting part 111 is located at the bottom of the cavity 12, and the resonator mounting post 112 is located on the cover plate 11. The rest of the structures are the same.

[0045] The cap 50 is screwed into the cap threaded hole 102 of the housing. The cap 50 is provided with a cap external thread 501, a screw hole 502, a probe through hole 503, a cap internal threaded hole 504, a cap limiting hole 505, and a cap bottom boss 506.

[0046] The external thread 501 of the cap is located on the outer edge of the cap 50 and is used to thread into the cap threaded hole 102 of the housing. The screw hole 502 and the probe hole 503 are arranged vertically and connected. The screw hole 502 is used to insert a torque wrench to adjust the tightness of the external thread 501 of the cap and the cap threaded hole 102 of the housing. The cap 50 can be easily screwed into the cap threaded hole 102 of the housing and fastened to the first medium 30 using the screw hole 502. The probe hole 503 is used to detect whether it is tightened. The internal threaded hole 504 of the cap is located at the center of the cap 50 and is used to thread into the adjusting member 60. The cap limiting hole 505 is located at the bottom center of the cap 50 and is recessed in the bottom of the cap 50 to position the cap 50 at the top of the second medium 40. The bottom boss 506 of the cap protrudes from the bottom of the cap 50 and is used to abut against the upper end face of the first medium 30.

[0047] It should be noted that the screw cap here can be of various shapes, such as having no screw holes or more than two probe holes, not having a screw cap bottom boss or screw cap limiting hole, or having screw holes in other non-circular shapes, but not limited to these; the thickness of the screw cap 50 can be equal to, less than or greater than the thickness of the screw cap mounting part 111; the material of the screw cap 50 can be a metal part, a high-strength engineering plastic part with a metallized surface, etc.

[0048] The resonator 20 is made of metal, with at least a metal-plated surface for easy energization. It is disposed within the resonant cavity 101 and fixed to the resonator mounting post 112 within the resonant cavity 101. The resonator 20 has an open-circuit end 201 and a ground end 202, which are arranged opposite to each other. The open-circuit end 201 is the free end of the resonator 20 and is spaced apart from the screw cap mounting part 111. It is used to connect the first dielectric element 30. The center of the open-circuit end 201 has a resonant rod inner hole 203 for mounting the second dielectric element 40. The ground end 202 is the fixed end connected to the resonator mounting post 112. It can be provided with mounting holes to facilitate connection to the resonator mounting post 112 with screws or direct welding to the resonator mounting post 112.

[0049] In this embodiment, the resonator 20 is exemplified by a metal resonator rod, which adopts a multi-step resonator rod form based on power capacity considerations. Its open-circuit end 201 adopts a structure with a flanged outer edge of a disk, which can increase the mechanical strength of the resonator 20. However, similar resonators without flanged outer edges and straight rod resonators can also achieve the function of a resonator.

[0050] It should be noted that the structure of the resonator 20 can be of various shapes, such as a cylindrical resonator, a resonator with a disk, a resonator with a flanged disk, a multi-step resonator, etc., but is not limited to these. In addition, the material of the resonator 20 is preferably aluminum alloy plated with silver, but it can also be any other metal material with an electroplated metal layer on the outer surface, such as Y15, stainless steel, brass, etc. The electroplated metal layer on the outer surface can be one or more of silver, copper, nickel, gold, and tin.

[0051] The first dielectric element 30, made of ceramic dielectric, is disposed on the open end 201 of the resonator 20. The first dielectric element 30 serves as a capacitor and is located between the resonator 20 and the screw cap 50. Its upper and lower end faces are silvered, which are respectively the second silvered surface 302 and the first silvered surface 301, serving as the upper and lower electrodes of the capacitor. A first dielectric element step 304 is provided on the outer edge of its upper end face, making the first dielectric element 30 have a T-shaped structure. The purpose of this design is to increase the power capacity of the resonator and avoid creepage breakdown. A first dielectric inner hole 303 is provided in the center of the first dielectric element 30, which is a through hole for housing the second dielectric element 40. The first dielectric element step 304 and the first dielectric inner hole 303 respectively increase the creepage distance and play a tuning role.

[0052] In this embodiment, the first dielectric element 30 is exemplified by a T-shaped dielectric ring structure, but it can be other shapes, such as cylindrical rings, I-shaped cylindrical rings, inner and outer T-shaped dielectric elements, etc., but is not limited to these. Its edges can be any chamfer size, such as right angles, rounded corners, or chamfered right angles.

[0053] When the diameter of the disk of the open end 201 of the resonator 20 is greater than the diameter of the first silvered surface 301 of the first dielectric element 30, i.e., the lower electrode, the power capacity of the resonator can be increased, but it is not limited to this.

[0054] The first dielectric element 30 is made of ceramic dielectric, and the dielectric material may include one or more of magnesium oxide, calcium oxide, titanium dioxide, zinc oxide, aluminum oxide, calcium carbonate, silicon dioxide, samarium oxide, aluminum oxide and strontium carbonate, but is not limited thereto.

[0055] When the diameter of the screw-on threaded hole 102 of the housing is larger than the outer diameter of the first dielectric element 30, it is convenient to replace the first dielectric element 30, which can be used as a capacitor, and can greatly improve the production efficiency of the resonator, but it is not limited to this.

[0056] The second metal pad 702 and the first metal pad 701 are respectively placed on the upper and lower end faces of the first dielectric element 30, and are in direct contact with the second silvered surface 302 and the first silvered surface 301 respectively. Their inner diameters are adapted to the outer diameters of the second dielectric element 40, which enhances the metal electrical interconnection and protects the silvered surface, preventing the bottom protrusion of the cap from damaging the silvered surface of the ceramic dielectric, and further improving the interconnection performance of the resonator.

[0057] In this embodiment, both the second metal gasket 702 and the first metal gasket 701 are annular and made of brass with an electroplated metal layer. However, any other type of gasket, such as Bellwell gasket, elastic gasket, wave gasket, toothed gasket, etc., can also be used. The material can also be any metal material such as beryllium bronze, phosphor bronze, copper, aluminum alloy, etc., with an electroplated metal layer.

[0058] The second dielectric element 40 is disposed in the inner hole 203 of the resonator and the inner hole 303 of the first dielectric element. It serves to install the adjusting element 60, the screw cap 50, the first dielectric element 30, the resonator 20, the second metal gasket 702, and the first metal gasket 701 on the same axis. It ensures that when the screw cap 50 is screwed down along the screw cap's internal thread hole 504, the above-mentioned parts are securely fastened, and it mainly serves to limit their movement.

[0059] In this embodiment, the second medium element 40 adopts a cylindrical structure. The upper end surface of the second medium element 40 is provided with a second medium element limiting step 401, which corresponds to the position of the screw cap limiting hole 505 of the screw cap 50, and is used to position the screw cap 50. The center of the second medium element 40 is provided with a second medium element inner hole 402, which is used to accommodate the adjusting element 60.

[0060] It should be noted that the second medium element 40 here can be other cylindrical shapes, and its material can be engineering plastics such as PTFE, PEK, PEEK, PI, PEI, etc., but is not limited to these.

[0061] The adjusting component 60 is screwed into the threaded hole 504 of the cap. The adjusting component 60 includes an adjusting rod 602 and an adjusting limiting boss 601 provided on the adjusting rod 602. The adjusting rod 602 is provided with an adjusting rod thread located below the adjusting limiting boss 601 for screwing into the threaded hole 504 of the cap. The lower end of the adjusting rod 602 extends into the inner hole 402 of the second dielectric element. The adjusting limiting boss 601 is the upper limit of the adjusting rod 602 extending into the inner hole 402 of the second dielectric element. The adjusting component 60 is screwed into the threaded hole 504 of the cap. By adjusting the depth of insertion into the inner hole 402 of the second dielectric element, the capacitance value between the open end 201 of the resonator 20 and the bottom surface of the cap is adjusted, thereby adjusting the capacitance value of the resonator 100 and ultimately changing the resonant frequency of the resonator 100.

[0062] It should be noted that the part of the adjusting rod 602 protruding from the cap 50 can be a smooth rod or a threaded part, and the head of the adjusting rod 602 can be any other shape such as a ball head or a flat head; similarly, the adjusting part 60 can also be a combination of a threaded rod with a limiting structure and a locking nut, and its material can be a metal part or a dielectric non-metallic material.

[0063] A setting gap 1001 is provided between the inner hole 402 of the second dielectric element and the adjusting rod 602 to prevent damage to the second dielectric 40 when the adjusting rod 602 rotates in, and to prevent foreign objects from getting stuck in the small gap. In addition, a clearance gap 1002 is also provided between the second dielectric element 40 and the resonator 20 to avoid repeated limiting. Of course, the setting gap 1001 and the clearance gap 1002 can also be omitted.

[0064] The assembly sequence of the resonator 100 is as follows: the resonator 20 is installed in the resonant cavity 101 inside the housing 10, which can be installed by screws or direct welding or any other reliable installation method. The first metal gasket 701, the first dielectric element 30, and the second metal gasket 702 are placed in sequence. The second dielectric element 40 is inserted through the inner hole at the center of each of the above parts. The screw cap mounting part 111 is assembled. The screw cap 50 is screwed into the screw cap threaded hole 102 in the housing and tightened with a specified torque wrench to form a complete dielectric-loaded resonator structure. Finally, the adjusting element 60 is screwed into the screw cap inner threaded hole 504 to adjust the frequency of the resonator 100 to a suitable frequency point. During the process, the adjusting element 60 of a suitable length can be adjusted and replaced until the adjusting element 60 can be securely fastened.

[0065] It should be noted that if the power required by the resonator is not high and the operating environment is also demanding, one or both of the second metal pad 702 and the first metal pad 701 can be omitted.

[0066] The first dielectric element 30 can be directly soldered to the open end 201 of the resonator 20, and the two form an assembly. This assembly is directly installed in the resonant cavity 101 of the resonator 20. During the manufacturing process of this assembly, attention should be paid to the matching of the expansion coefficients of the first dielectric element 30 and the resonator 20, as well as the welding process parameters, to avoid the first dielectric element 30 from breaking or failing during the welding process, or failing during operation. If the second metal gasket 702 is omitted, the second dielectric element 40 can also be omitted.

[0067] This embodiment also provides a filter, which includes one or more of the above-mentioned resonators 100. If the filter includes multiple resonators 100, the housings 10 of each resonator 100 can be connected as one unit.

[0068] The filter uses the aforementioned resonator 100, and therefore it also has the technical effects brought about by the technical solution of the aforementioned resonator 100. Both can produce high-performance filter products, effectively improve filter performance, reduce filter cavity size, improve long-term product reliability, reduce filter scrap rate and maintenance costs, and improve the market competitiveness of filter products.

[0069] Finally, it should be noted that the above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. However, any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A dielectric-loaded coaxial resonator with a screw-cap structure, characterized in that, include The housing (10) has a screw cap mounting part (111) and a resonant cavity (101) inside. A resonant element (20) is disposed in the resonant cavity (101) and includes an open-circuit end (201) and a ground end (202) disposed opposite to each other. The ground end (202) is connected to the resonant cavity (101). The first dielectric element (30) is disposed on the open end (201) of the resonator (20). Its upper and lower end faces are covered with silver, which are the second silver-covered surface (302) and the first silver-covered surface (301). A first dielectric inner hole (303) is provided in its center. The first silver-covered surface (301) is connected to the open end (201). The cap (50) is screwed onto the cap mounting part (111) and has a cap internal thread hole (504). The bottom of the cap (50) is connected to the second silver surface (302), and a capacitor is formed between the cap (50) and the open end (201). And the adjusting component (60) is screwed into the threaded hole (504) of the cap, with its lower end protruding into the inner hole (303) of the first dielectric. The adjusting component (60), the resonator (20), the first dielectric component (30), and the cap (50) are all coaxially arranged. Adjusting the insertion depth of the adjustment member (60) changes the capacitance value of the capacitor between the open end (201) and the screw cap (50), thereby adjusting the resonant frequency of the resonator.

2. A dielectric-loaded coaxial resonator with a screw-cap structure according to claim 1, characterized in that, A second metal gasket (702) is provided between the screw cap (50) and the second silvered surface (302), and a first metal gasket (701) is provided between the open end (201) of the resonator (20) and the first silvered surface (301) to enhance the metal electrical interconnection and protect the silvered surface.

3. A dielectric-loaded coaxial resonator with a screw-cap structure according to claim 1, characterized in that, It also includes a second dielectric element (40), the upper end of which is connected to the screw cap (50). The open end (201) of the resonator (20) is provided with a resonant rod inner hole (203) to accommodate the second dielectric element (40). The lower end of the second dielectric element (40) is inserted into the first dielectric inner hole (303) and the resonant rod inner hole (203) in sequence. The second dielectric element (40) is coaxially installed with the first dielectric element (30) and the resonator (20).

4. A dielectric-loaded coaxial resonator with a screw-cap structure according to claim 3, characterized in that, The second dielectric element (40) has a second dielectric element inner hole (402) at its center for inserting the adjustment element (60), and an adjustment gap (1001) is provided between the second dielectric element inner hole (402) and the adjustment rod (602); and an avoidance gap (1002) is provided between the second dielectric element (40) and the resonator (20).

5. A dielectric-loaded coaxial resonator with a screw-cap structure according to claim 3, characterized in that, The bottom of the cap (50) is provided with a cap limiting hole (505), and the upper end surface of the second medium element (40) is provided with a second medium element limiting step (401) that is adapted to the cap limiting hole (505).

6. A dielectric-loaded coaxial resonator with a screw-cap structure according to claim 1, characterized in that, The first medium element (30) has a T-shaped structure, and a first medium element step (304) is provided on the outer edge of its upper end face.

7. A dielectric-loaded coaxial resonator with a screw-cap structure according to claim 1, characterized in that, The cap (50) is also provided with a screw hole (502) and a probe hole (503), which are set up vertically and connected to each other.

8. A dielectric-loaded coaxial resonator with a screw-cap structure according to claim 1, characterized in that, The adjusting member (60) includes an adjusting rod (602) and an adjusting limiting boss (601) provided on the adjusting rod (602). The adjusting rod (602) is provided with an adjusting rod thread for matching the internal threaded hole (504) of the cap.

9. A dielectric-loaded coaxial resonator with a screw-cap structure according to claim 1, characterized in that, The outer diameter of the open end (201) of the resonator (20) is greater than the outer diameter of the first silvered surface (301) of the first dielectric element (30).

10. A filter, characterized in that, Including a dielectric-loaded coaxial resonator with a screw cap structure as described in any one of claims 1 to 9.

Images