A resonator, filter, duplexer, multiplexer, and communication device

Abstract

The present application provides a resonator, filter, duplexer, multiplexer and communication device, the resonator comprises a resonant cavity, the resonant cavity has a resonant cavity and an open end, the resonator further comprises a deformed cover plate covering the open end and connected with the resonant cavity, a resonant tube located in the resonant cavity, and an adjusting mechanism arranged on the deformed cover plate, a groove is formed on the side of the deformed cover plate away from the resonant cavity, the adjusting mechanism is arranged in the groove and is used to provide a force in the axial direction of the resonant tube, so that the bottom of the groove is continuously deformed to adjust the distance between the deformed cover plate and the resonant tube. The present application can improve the intermodulation performance and high-power performance of the product, and at the same time, the production pass rate of the product can be improved, the product scrap rate and maintenance cost can be reduced, and the market competitiveness of the product can be improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of communication equipment, in particular to a resonator, a filter, a duplexer, a multiplexer and a communication equipment. BACKGROUND

[0002] The cavity filter is widely used in the communication field, especially in the radio frequency communication field, as a frequency selection device. In the base station, the filter is used to select the communication signal and filter out the noise or interference signal other than the communication signal frequency.

[0003] The conventional cavity coaxial filter mainly comprises a cavity, a cover plate, a resonant rod, a tuning screw, a coupling screw, a window and a connector. The cavity, the cover plate, the resonant rod and the tuning screw form a filter resonant cavity. The tuning screw is installed on the cover plate through a threaded structure. The resonant frequency of the filter is adjusted by rotating the tuning screw to change the distance between the tuning screw and the resonant rod, so that the filter reaches the ideal index. Specifically, the conventional cavity coaxial filter is provided with a threaded hole on the cover plate. The tuning screw is matched with the threaded hole. In the matching process of the tuning screw and the threaded hole, burrs and debris are inevitably generated, which reduces the intermodulation performance and power performance of the filter. SUMMARY

[0004] The present application provides a resonator capable of improving the intermodulation performance, high-power performance and product pass rate of the product, and a filter, a duplexer, a multiplexer and a communication equipment using the resonator.

[0005] In a first aspect, a resonator is provided, comprising a resonant cavity body having a resonant cavity and an open end, a deformed cover plate covering the open end and connected with the resonant cavity body, a resonant tube located in the resonant cavity, and an adjusting mechanism arranged on the deformed cover plate. A groove is formed on the side of the deformed cover plate away from the resonant cavity. The adjusting mechanism is arranged in the groove and is used to provide an acting force in the axial direction of the resonant tube, so that the bottom of the groove is continuously deformed to adjust the distance between the deformed cover plate and the resonant tube.

[0006] In a first possible implementation manner of the first aspect, the adjusting mechanism comprises a support cover plate arranged at the opening of the groove, an adjusting rod with one end penetrating through the support cover plate and fixedly connected with the bottom of the groove, and an adjusting nut sleeved on the adjusting rod. The adjusting nut is located on the side of the support cover plate away from the bottom of the groove. An external thread is formed on the outer surface of the adjusting rod for matching with the adjusting nut. An annular boss is formed at the opening of the groove. The edge of the support cover plate abuts on the annular boss.

[0007] In a second possible implementation manner of the first aspect, the adjusting mechanism comprises a support cover plate arranged at the opening of the groove, an adjusting rod with one end penetrating through the support cover plate and fixedly connected with the bottom of the groove, and an adjusting nut sleeved outside the adjusting rod, the adjusting nut being located at the side of the support cover plate away from the groove and axially fixed with the support cover plate, the adjusting rod being provided with an external thread outside for cooperating with the adjusting nut, and the opening of the groove being provided with a limiting structure for limiting displacement of the support cover plate along the axial direction of the adjusting rod.

[0008] In a third possible implementation manner of the first aspect, a through hole is arranged on the support cover plate, and the bottom of the groove is provided with an opening, and one end of the adjusting rod penetrates through the through hole and is fixedly connected in the opening.

[0009] In a fourth possible implementation manner of the first aspect, the bottom of the groove is formed with a first boss, and the first boss is provided with the opening.

[0010] In a fifth possible implementation manner of the first aspect, the adjusting rod is in interference fit with the opening.

[0011] In a sixth possible implementation manner of the first aspect, the bottom of the resonant cavity is formed with a second boss, one end of the resonant tube is connected with the second boss, and the other end of the resonant tube extends in the direction close to the deformed cover plate.

[0012] In a seventh possible implementation manner of the first aspect, the end of the resonant tube close to the deformed cover plate is in a closed form.

[0013] In an eighth possible implementation manner of the first aspect, the end of the resonant tube close to the deformed cover plate is in an open form.

[0014] In a second aspect, a filter is provided, comprising at least one resonator provided in the first aspect.

[0015] In a third aspect, a diplexer is provided, comprising a transmitting channel filter and a receiving channel filter, and the transmitting channel filter and the receiving channel filter are filtered by the filter provided in the second aspect.

[0016] In a fourth aspect, a multiplexer is provided, comprising a plurality of transmitting channel filters and a plurality of receiving channel filters, and the transmitting channel filters and the receiving channel filters are filtered by the filter provided in the second aspect.

[0017] In a fifth aspect, a communication device is provided, comprising at least one resonator provided in the first aspect.

[0018] The resonator provided by the first aspect according to various embodiments is characterized in that a groove is formed on the side of the deformed cover plate facing away from the resonant cavity, and an adjusting mechanism is arranged in the groove, the adjusting mechanism is used to provide an acting force in the axial direction of the resonant tube, so that the bottom of the groove is continuously deformed to adjust the distance between the deformed cover plate and the resonator, thereby adjusting the resonant frequency of the resonator; the tuning screw and the threaded hole on the cover plate of the traditional cavity filter are cancelled, so that the burrs and debris generated when the tuning screw cooperates with the threaded hole can be avoided to affect the intermodulation performance and the high-power index of the cavity filter, the intermodulation performance and the high-power performance of the product can be improved, the production pass rate of the product can be improved, the product scrap rate and the maintenance cost can be reduced, and the market competitiveness of the product can be improved. BRIEF DESCRIPTION OF DRAWINGS

[0019] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the embodiments or the prior art description will be briefly introduced below. 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.

[0020] Figure 1 is a sectional view of the resonator provided by the first embodiment of the present application;

[0021] Figure 2 is an enlarged schematic view of the A area of the resonator provided by the first embodiment of the present application;

[0022] Figure 3 is a top view of the resonator provided by the first embodiment of the present application;

[0023] Figure 4 is a sectional view of the resonant tube and the resonant cavity provided by the first embodiment of the present application;

[0024] Figure 5 is a top view of the resonant tube and the resonant cavity provided by the first embodiment of the present application;

[0025] Figure 6 is a sectional view of the resonant tube provided by the first embodiment of the present application;

[0026] Figure 7 is a sectional view of the resonant tube provided by the second embodiment of the present application;

[0027] Figure 8 is a sectional view of the resonant tube provided by the third embodiment of the present application;

[0028] Figure 9 is a sectional view of the resonant tube provided by the fourth embodiment of the present application.

[0029] In the drawings:

[0030] 100, resonator; 10, resonant cavity; 101, resonant cavity; 102, open end; 11, second boss; 20, deformed cover plate; 201, opening; 21, groove; 22, annular boss; 23, first boss; 30, resonant tube; 31, flange; 32, mounting hole; 40, adjusting mechanism; 41, support cover plate; 411, through hole; 42, adjusting rod; 421, external thread; 43, adjusting nut. DETAILED DESCRIPTION

[0031] In order to make the technical problems to be solved by the present application, technical solutions and beneficial effects more clearly, the present application will be further described in detail below in combination with the drawings and examples. It should be understood that the specific examples described herein are only used to explain the present application and do not limit the present application.

[0032] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it can be directly on the other element or indirectly on the other element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or indirectly connected to the other element.

[0033] It should be understood that the terms "length", "width", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only used to facilitate the description of the present application and simplify the description, and therefore cannot be understood as indicating or implying that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application.

[0034] In addition, the terms "first", "second" are only for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined with "first", "second" can explicitly or implicitly include one or more of the features. In the description of the present application, the meaning of "multiple" is two or more, unless otherwise specifically limited.

[0035] Please refer to Figures 1 to 5 A structure diagram of a resonator 100 provided for the first embodiment of the present application. The resonator 100 includes a resonant cavity 10, a deformed cover plate 20 and a resonant tube 30. Further, the resonator 100 further includes an adjusting mechanism 40.

[0036] The resonant cavity 10 is a metal cavity, which can be a metal material as a whole or a cavity with at least an inner surface metallized, and has a resonant cavity 101 and an open end 102. The deformed cover plate 20 covers the open end 102 and is connected with the resonant cavity 10. The connection between the deformed cover plate 20 and the resonant cavity 10 can be screw connection or the like.

[0037] The resonant tube 30 is located in the resonant cavity 101. In the embodiment, the resonant tube 30 can be formed integrally with the resonant cavity 10, that is, the resonant tube 30 is formed integrally on the inner side of the bottom of the resonant cavity 10. In other embodiments, the resonant tube 30 can also be an independent component and is fixedly connected with the resonant cavity 10 through a fixing element.

[0038] The adjusting mechanism 40 is arranged on the deformed cover plate 20. In the embodiment, the deformed cover plate 20 is continuously deformed through the adjusting mechanism 40, so that the distance between the deformed cover plate 20 and the resonant tube 30 is adjustable. Specifically, a groove 21 is formed on the side of the deformed cover plate 20 away from the resonant tube 30, and the adjusting mechanism 40 is arranged in the groove 21. The adjusting mechanism 40 is used to provide an acting force in the axial direction of the resonant tube 30, so that the bottom of the groove 21 is continuously deformed to adjust the distance between the deformed cover plate 20 and the resonant tube 30, and further adjust the resonant frequency of the resonator 100.

[0039] The groove 21 is arranged to make the thickness of the deformed part of the deformed cover plate 20 smaller, so that the deformed cover plate 20 is deformed by the adjusting mechanism 40 with smaller external force, and the adjustability and tuning sensitivity of the filter are improved. In addition, the overall height of the filter is reduced, which is convenient for the miniaturization and thinning of the filter.

[0040] In the embodiment, the continuous deformation of the deformed cover plate 20 can include continuous deformation of the deformed cover plate 20 in the direction close to the resonant tube 30, so that the distance between the deformed cover plate 20 and the resonant tube 30 is continuously reduced. The continuous deformation of the deformed cover plate 20 also includes continuous deformation of the deformed cover plate 20 in the direction away from the resonant tube 30, so that the distance between the deformed cover plate 20 and the resonant tube 30 is continuously increased.

[0041] In the embodiment, the resonant tube 30 is opposite to the deformation cover plate 20, and a flat plate capacitor C is formed between the deformation cover plate 20 and the resonant tube 30. The frequency property of the resonator 100 is changed by changing the size of the flat plate capacitor C, and the size of the flat plate capacitor C is related to the distance between the deformation cover plate 20 and the resonant tube 30. Therefore, the resonant frequency of the resonator 100 is changed by changing the distance between the deformation cover plate 20 and the resonant tube 30. The resonant frequency calculation formula of the resonator 100 is F = 1 / 2*pi*sqrt(L*C), wherein F is the resonant frequency, pi is a constant, L is the inductance, the larger the flat plate capacitor C is, the lower the resonant frequency F is, and the smaller the flat plate capacitor C is, the higher the resonant frequency F is.

[0042] The resonator 100 provided by the embodiment changes the resonant frequency of the resonator 100 by opening the groove 21 on the side of the deformation cover plate 20 away from the resonant cavity 101 and arranging the adjusting mechanism 40 in the groove 21. The adjusting mechanism 40 is used to provide an acting force in the axial direction of the resonant tube 30, so that the bottom of the groove 21 is continuously deformed to adjust the distance between the deformation cover plate 20 and the resonant tube 30, thereby adjusting the resonant frequency of the resonator 100. Thus, the embodiment cancels the tuning screw and the threaded hole on the cover plate of the traditional cavity filter, thereby avoiding the influence of burrs and debris generated when the tuning screw cooperates with the threaded hole on the cavity filter, improving the intermodulation performance and high-power performance of the product, improving the production pass rate of the product, reducing the product scrap rate and maintenance cost, and further improving the market competitiveness of the product.

[0043] In an embodiment, the adjusting mechanism 40 includes a support cover plate 41, an adjusting rod 42 and an adjusting nut 43. The support cover plate 41 is arranged at the opening of the groove 21, one end of the adjusting rod 42 is fixedly connected with the bottom of the groove 21 after penetrating through the support cover plate 41, the adjusting nut 43 is sleeved on the adjusting rod 42, and the adjusting nut 43 is located on the side of the support cover plate 41 away from the groove 21. An external thread 421 extending in the axial direction of the adjusting rod 42 is arranged on the outer surface of the adjusting rod 42, and the external thread 421 is used to cooperate with the adjusting nut 43.

[0044] In the embodiment, in order to limit the axial displacement of the support cover plate 41, an annular boss 22 is formed at the opening of the groove 21, and the edge of the support cover plate 41 abuts against the annular boss 22. Specifically, the groove 21 is circular, and a through hole with a larger diameter than the groove 21 is formed at the opening of the groove 21 and extends radially outward, so that the annular boss 22 is conveniently formed at the opening of the groove 21, the bottom edge of the support cover plate 41 abuts against the annular boss 22, and the side surface of the support cover plate 41 abuts against the side surface of the groove 21 adjacent to the annular boss 22.

[0045] In the embodiment, when the adjusting nut 43 is rotated under the action of an external force, the support cover plate 41 limits the displacement of the adjusting nut 43 towards the resonant tube 30, so that a reaction force is applied to the adjusting rod 42, the adjusting rod 42 is displaced away from the resonant tube 30, and the bottom of the groove 21 fixedly connected to the adjusting rod 42 is deformed away from the resonant tube 30, so that the distance between the resonant tube 30 and the deformed cover plate 20 continuously increases.

[0046] In the embodiment, the axial displacement of the support cover plate 41 away from the resonant tube 30 can be limited or not limited. When the distance between the deformed cover plate 20 and the resonant tube 30 needs to continuously decrease, i.e., the deformed cover plate 20 needs to be deformed towards the resonant tube 30, the adjusting nut 43 can be loosened, and a downward force is applied to the adjusting rod 42 to deform the deformed cover plate 20 towards the resonant tube 30.

[0047] In another embodiment, the adjusting mechanism 40 includes a support cover plate 41, an adjusting rod 42, and an adjusting nut 43. The support cover plate 41 is arranged at the opening of the groove 21, one end of the adjusting rod 42 is fixedly connected to the bottom of the groove 21 after penetrating through the support cover plate 41, and the adjusting nut 43 is sleeved outside the adjusting rod 42. The adjusting nut 43 is located on the side of the support cover plate 41 away from the groove 21, and an external thread 421 extending in the axial direction of the adjusting rod 42 is formed on the outer surface of the adjusting rod 42, which is used for cooperation with the adjusting nut 43.

[0048] In the embodiment, the adjusting nut 43 is axially fixed with the support cover plate 41, i.e. the axial relative position of the adjusting nut 43 with the support cover plate 41 is kept unchanged. Specifically, the support cover plate 41 can rotate around the adjusting rod 42, and the adjusting nut 43 is fixedly connected with the support cover plate 41, such as by welding or bonding or other connection manners, so that the support cover plate 41 can rotate together with the adjusting nut 43. It can be understood that in other embodiments, the support cover plate 41 can also be axially fixed with the adjusting nut 43 only, but the adjusting nut 43 can rotate relative to the support cover plate 41, while the support cover plate 41 is fixed.

[0049] In order to limit the axial displacement of the support cover plate 41, a limiting structure for limiting the displacement of the support cover plate 41 in the axial direction of the adjusting rod 42 is arranged at the opening of the groove 21. Specifically, the limiting structure can be an annular groove 21, the edge of the support cover plate 41 is clamped in the annular groove 21 and can rotate in the annular groove 21. Preferably, the groove 21 is circular, and the support cover plate 41 is also circular, so as to facilitate the rotation of the support cover plate 41. In order to facilitate the disassembly and assembly of the support cover plate 41, the annular groove 21 can be formed by the annular boss 22 and the limiting block or limiting ring arranged at the opening of the groove 21.

[0050] In the embodiment, when the adjusting nut 43 is rotated in a first direction under the action of an external force, the support cover plate 41 will rotate together with the adjusting nut 43, and since the axial displacement of the support cover plate 41 is limited, the axial displacement of the adjusting nut 43 is also limited, at this time a reaction force will be applied to the adjusting rod 42, so that the adjusting rod 42 is displaced away from the resonant tube 30, and in turn drives the bottom of the groove 21 fixedly connected thereto to deform away from the resonant tube 30, so that the distance between the resonant tube 30 and the deformed cover plate 20 continuously increases; when the adjusting nut 43 is rotated in a second direction opposite to the first direction under the action of an external force, the support cover plate 41 will rotate together with the adjusting nut 43, and since the axial displacement of the support cover plate 41 is limited, the axial displacement of the adjusting nut 43 is also limited, at this time a reaction force will be applied to the adjusting rod 42, so that the adjusting rod 42 is displaced towards the resonant tube 30, and in turn drives the bottom of the groove 21 fixedly connected thereto to deform towards the resonant tube 30, so that the distance between the resonant tube 30 and the deformed cover plate 20 continuously decreases.

[0051] In an embodiment, a through hole 411 is formed on the support cover plate 41, an opening 201 is formed on the bottom of the groove 21, and one end of the adjusting rod 42 is fixedly connected to the opening 201 after penetrating the through hole 411. In this embodiment, the adjusting rod 42 is in clearance fit with the through hole 411, and one end of the adjusting rod 42 is inserted into the opening 201 and fixedly connected to the opening 201 after penetrating the through hole 411. The through hole 411 and the opening 201 are both smooth-walled holes, and the adjusting rod 42 does not rub against the inner wall of the through hole 411 when it axially moves in the through hole 411. Therefore, burrs or debris are not generated between the adjusting rod 42 and the support cover plate 41 during adjustment. In addition, since the adjusting rod 42 is fixedly connected to the opening 201, burrs or debris are not generated between the adjusting rod 42 and the deformed cover plate 20 during adjustment. The opening 201 can or can not penetrate the bottom of the groove 21.

[0052] In an embodiment, a first boss 23 is formed on the bottom of the groove 21, and the opening 201 is formed in the first boss 23. In this embodiment, the thickness of the deformed cover plate 20 at the bottom of the groove 21 is relatively small, and the deformation amount of the part of the deformed cover plate 20 connected to the adjusting rod 42 is the largest when the deformed cover plate 20 is deformed. To prevent the deformed cover plate 20 from being broken during deformation, a first boss 23 is arranged at the position of the deformed cover plate 20 connected to the adjusting rod 42 at the bottom of the groove 21. The first boss 23 can strengthen the connection between the adjusting rod 42 and the deformed cover plate 20, prevent the deformed cover plate 20 from being broken during deformation, or prevent the deformed cover plate 20 from being disconnected from the adjusting rod 42 during deformation.

[0053] In an embodiment, the adjusting rod 42 is in interference fit with the opening 201. Specifically, the adjusting rod 42 is press riveted in the opening 201 through an interference structure, which includes interference, interference with knurling, interference with barbs, and interference with knurling and barbs. In this embodiment, the interference structure is arranged on the adjusting rod 42 to facilitate the firm connection between the adjusting rod 42 and the opening 201. In actual application, the adjusting rod 42 can be a press rivet screw, which is press riveted to the opening 201.

[0054] In an embodiment, a second boss 11 is formed on the bottom of the resonant cavity 10, and the resonant tube 30 is tubular, with one end connected to the second boss 11 and the other end extending towards the deformed cover plate 20. The resonant tube 30 is coaxial with the adjusting rod 42.

[0055] Please refer toFigure 6 A sectional view of a resonant tube 30 according to the first embodiment of the present application is shown in FIG. 1. The resonant tube 30 is closed at one end near the deformable cover plate 20, and has a flange 31 at the end near the deformable cover plate 20. In this embodiment, the flange 31 is ring-shaped, and its cross-section is arc-shaped, i.e., the top of the resonant tube 30 is arc-shaped. The resonant tube 30 is open at the end away from the deformable cover plate 20, and is riveted to the second boss 11.

[0056] Referring to FIG. 2, Figure 7 A sectional view of a resonant tube 30 according to the second embodiment of the present application is shown in FIG. 2. The resonant tube 30 is closed at one end near the deformable cover plate 20, and has a flange 31 at the end near the deformable cover plate 20. In this embodiment, the flange 31 is ring-shaped, and its cross-section is square-shaped, i.e., the top of the resonant tube 30 is flat. The resonant tube 30 is open at the end away from the deformable cover plate 20, and is riveted to the second boss 11.

[0057] Referring to FIG. 3, Figure 8 A sectional view of a resonant tube 30 according to the third embodiment of the present application is shown in FIG. 3. The resonant tube 30 is open at one end near the deformable cover plate 20, and has a flange 31 at the end near the deformable cover plate 20. In this embodiment, the flange 31 is ring-shaped, and its cross-section is square-shaped, i.e., the top of the resonant tube 30 is flat. The resonant tube 30 is open at the end away from the deformable cover plate 20, and is riveted to the second boss 11.

[0058] Referring to FIG. 4, Figure 9 A sectional view of a resonant tube 30 according to the fourth embodiment of the present application is shown in FIG. 4. The resonant tube 30 is open at one end near the deformable cover plate 20, and has a flange 31 at the end near the deformable cover plate 20. In this embodiment, the flange 31 is ring-shaped, and its cross-section is square-shaped, i.e., the top of the resonant tube 30 is flat. The resonant tube 30 has a mounting hole 32 at the end away from the deformable cover plate 20, and is connected to the bottom of the resonant cavity 10 by a fastener. Specifically, one end of the fastener is fixedly connected to the bottom of the resonant cavity 10 after passing through the mounting hole 32.

[0059] It can be understood that in other embodiments, the resonant tube 30 can not have a flange.

[0060] The embodiment of the present application also provides a filter, which is combined by the resonators 100, wherein at least one of the resonators 100 adopts the structure of the resonator 100.

[0061] The embodiment of the present application also provides a diplexer, which comprises a transmitting channel filter and a receiving channel filter, wherein the transmitting channel filter and the receiving channel filter adopt the filter.

[0062] The embodiment of the present application also provides a multiplexer, which comprises a plurality of transmitting channel filters and a plurality of receiving channel filters, wherein the transmitting channel filters and the receiving channel filters adopt the filter.

[0063] The embodiment of the present application also provides a communication device, which comprises at least one resonator 100.

[0064] It can be understood that the filter, the diplexer or the multiplexer provided by the above embodiment can be applied to a communication system, such as a communication device (for example, a base station or a terminal), or a radar system, which is not limited herein.

[0065] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, and not to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that the protection scope of the present application is not limited thereto, and any changes or replacements within the technical range disclosed by the present application can be easily thought by those skilled in the art, which should be covered within the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the protection scope of the claims.

Claims

1. A resonator characterized by: The resonant cavity has a resonant cavity and an open end, and the resonator further comprises a deformed cover plate covering the open end and connected with the resonant cavity, a resonant tube located in the resonant cavity, and an adjusting mechanism arranged on the deformed cover plate, a groove is formed on the side of the deformed cover plate away from the resonant cavity, the adjusting mechanism is arranged in the groove and is used to provide an acting force in the axial direction of the resonant tube, so that the bottom of the groove is continuously deformed to adjust the distance between the deformed cover plate and the resonant tube, the continuous deformation of the bottom of the groove includes continuous deformation of the bottom of the groove towards the resonant tube and continuous deformation of the bottom of the groove away from the resonant tube. The adjusting mechanism comprises a supporting cover plate arranged at the opening of the groove, an adjusting rod with one end penetrating through the supporting cover plate and being fixedly connected with the bottom of the groove to be limited from rotating, and an adjusting nut sleeved on the adjusting rod, the adjusting nut is located on the side of the supporting cover plate away from the bottom of the groove, an external thread is formed on the outer surface of the adjusting rod for cooperating with the adjusting nut, the adjusting nut is axially fixed with the supporting cover plate, and the adjusting nut can rotate to drive the adjusting rod to displace towards the resonant tube or away from the resonant tube. A through hole is formed in the supporting cover plate, and the bottom of the groove is provided with an opening, one end of the adjusting rod penetrates through the through hole and is fixedly connected in the opening, and the adjusting rod is gap-fitted with the through hole.

2. The resonator of claim 1, wherein: An annular boss is formed at the opening of the groove, and the edge of the supporting cover plate abuts on the annular boss.

3. The resonator of claim 1, wherein: A limiting structure is arranged at the opening of the groove for limiting the displacement of the supporting cover plate in the axial direction of the adjusting rod.

4. The resonator of claim 1, wherein: A first boss is formed at the bottom of the groove, and the opening is formed in the first boss.

5. The resonator of claim 1, wherein: The adjusting rod is interference-fitted with the opening.

6. The resonator of claim 1, wherein: A second boss is formed at the bottom of the resonant cavity, one end of the resonant tube is connected with the second boss, and the other end of the resonant tube extends towards the deformed cover plate.

7. The resonator of claim 6, wherein: The end of the resonant tube close to the deformed cover plate is in a closed shape.

8. The resonator of claim 6, wherein: The end of the resonant tube close to the deformed cover plate is in an open shape.

9. A filter characterized by: The resonator comprises at least one resonator as claimed in any one of claims 1 to 8.

10. A diplexer characterized by: The filter comprises a transmitting channel filter and a receiving channel filter, and the transmitting channel filter and the receiving channel filter are filtered by the filter as claimed in claim 9.

11. A multiplexer characterized by: The filter comprises a plurality of transmitting channel filters and a plurality of receiving channel filters, and the transmitting channel filters and the receiving channel filters are filtered by the filter as claimed in claim 9.

12. A communication device, characterized by: The resonator comprises at least one resonator as claimed in any one of claims 1 to 8.

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