Cavity filter and cover plate assembly therefor and communication device

Abstract

The application provides a cavity filter and a cover plate assembly thereof and a communication device comprising the cavity filter, the cavity filter comprising a cavity, a cover plate assembly, input / output parts, the cover plate assembly comprising a cover plate body and a resonant tube, a lower surface of the cover plate body being provided with a connecting cylinder, the resonant tube being connected with the cylinder, the cover plate assembly being used to cover the cavity by welding or screw fixing to form a resonant cavity; the input / output parts extending into the resonant cavity through the cavity and / or the cover plate body and being connected with the resonant tube in a capacitive coupling mode or an inductive coupling mode. The cavity filter and the cover plate assembly thereof and the communication device comprising the cavity filter can reduce the structural parts in the resonant cavity and optimize radio frequency adjustment by connecting the resonant tube with the cover plate body into the cover plate assembly.

Description

Technical Field

[0001] This invention relates to the field of communication technology, and more specifically to a cavity filter and its cover plate assembly, as well as a communication device including the cavity filter. Background Technology

[0002] In mobile communication base station systems, communication signals carrying communication data within a specific frequency range are typically transmitted via a transmitting antenna and received via a receiving antenna. The signal received by the receiving antenna not only contains the communication signal carrying the communication data within the specific frequency range but also includes various noise or interference signals outside that range. To extract the communication signal carrying the communication data within the specific frequency range transmitted by the transmitting antenna from the signal received by the receiving antenna, it is usually necessary to filter the received signal using a cavity filter to remove the noise or interference signals outside the specific frequency range.

[0003] Cavity filters are widely used as frequency selective devices. For example... Figure 1 As shown, in the prior art, cavity filters typically include a cavity 11, a cover plate 12, a resonant tube 13, and a tuning screw 14. The cover plate 12 seals the cavity 11 to form a resonant cavity. The resonant tube 13 is fixed to the bottom of the cavity 11 by screws. The tuning screw 14 extends through the cover plate 12 into the resonant tube 13 for adjusting radio frequency parameters. The numerous internal components of the resonant cavity can easily affect the radio frequency parameters. In addition to the resonant tube 13, the cavity also includes screws for fixing the resonant tube 13. Accordingly, the cavity 11 needs to be designed with an assembly table with threaded holes, and the tuning screw 14 is essential for radio frequency adjustment. Summary of the Invention

[0004] The present invention provides a cavity filter and its cover plate assembly, as well as a communication device including the cavity filter, to solve the technical problem that the large number of structural components in the resonant cavity in the prior art can easily affect the radio frequency parameters.

[0005] To solve the above-mentioned technical problems, one technical solution adopted by the present invention is: to provide a cover plate assembly for a cavity filter, the cover plate assembly including a cover plate body and a resonant tube, the lower surface of the cover plate body being provided with a connecting cylinder, and the resonant tube being connected to the connecting cylinder.

[0006] According to one embodiment of the present invention, the cover plate body is provided with a deformation zone, the deformation zone being used to receive an adjusting force to adjust the position of the resonant tube relative to the cover plate body; or

[0007] The upper surface of the cover plate body is provided with a recessed assembly cavity. The cover plate assembly also includes an adjusting fitting and an adjusting screw that is screwed to the adjusting fitting. The adjusting screw is used to abut against the area of ​​the cover plate body where the connecting cylinder is provided to adjust the position of the resonant tube relative to the cover plate body.

[0008] According to one embodiment of the present invention, the deformation zone is the area on the cover plate body surrounding the resonant tube.

[0009] According to one embodiment of the present invention, the material thickness of the deformation zone is less than the material thickness of the cover plate body.

[0010] According to one embodiment of the present invention, the deformation zone is in the form of a single-ring groove or in the form of multiple-ring grooves.

[0011] According to one embodiment of the present invention, the resonant tube includes an annular wall and a bottom wall, the top end of the annular wall is connected to the connecting cylinder, and the bottom end of the annular wall is connected to the bottom wall.

[0012] According to one embodiment of the present invention, the bottom wall further extends to include a flange portion.

[0013] According to one embodiment of the present invention, a flying rod is further connected to the ring wall.

[0014] To solve the above-mentioned technical problems, another technical solution adopted by the present invention is: to provide a cavity filter, the cavity filter comprising:

[0015] cavity;

[0016] The aforementioned cover plate assembly seals the cavity to form a resonant cavity by welding or screw fixing.

[0017] The input / output component extends into the resonant cavity through the cavity and / or the cover plate body and is capacitively or inductively coupled to the resonant tube.

[0018] To solve the above-mentioned technical problems, another technical solution adopted by the present invention is to provide a communication device, wherein the communication device includes the aforementioned cavity filter, and the communication device is at least one of a duplexer, simplexer, splitter, combiner, or tower-top amplifier.

[0019] The beneficial effects of the present invention are as follows: Unlike the prior art, the cavity filter and its cover plate assembly, as well as the communication device including the cavity filter, provided by the present invention can reduce the structural components inside the resonant cavity and optimize the radio frequency modulation by connecting the resonant tube and the cover plate to form a cover plate assembly. Attached Figure Description

[0020] To more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort, wherein:

[0021] Figure 1 This is a schematic diagram of the cross-sectional structure of a common cavity filter in existing technology;

[0022] Figure 2 This is a partial cross-sectional structural diagram of the cavity filter provided in the first embodiment of the present invention;

[0023] Figure 3 This is a partial cross-sectional structural diagram of the cavity filter provided in the first embodiment of the present invention;

[0024] Figure 4 This is a partial cross-sectional structural diagram of the cavity filter provided in the second embodiment of the present invention;

[0025] Figure 5 This is a partial cross-sectional structural diagram of the cavity filter provided in the third embodiment of the present invention;

[0026] Figure 6 This is a partial cross-sectional structural diagram of the cavity filter provided in the fourth embodiment of the present invention;

[0027] Figure 7 This is a schematic diagram of the structure of the cavity filter assembly provided in the fourth embodiment of the present invention;

[0028] Figure 8 This is a partial cross-sectional structural diagram of the cavity filter provided in the fifth embodiment of the present invention;

[0029] Figure 9 This is a schematic diagram of the cross-sectional structure of the cavity filter provided in the sixth embodiment of the present invention;

[0030] Figure 10 This is a three-dimensional structural schematic diagram of the cavity filter provided in the seventh embodiment of the present invention;

[0031] Figure 11 This is a schematic diagram of the cavity filter provided by the present invention for debugging. Detailed Implementation

[0032] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of them. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0033] It should be noted that if the embodiments of the present invention involve directional indicators (such as up, down, left, right, front, back, etc.), the directional indicators are only used to explain the relative positional relationship and movement of the components in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indicators will also change accordingly.

[0034] Furthermore, if the embodiments of this invention involve descriptions such as "first" or "second," these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. If the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by this invention.

[0035] Please refer to the following: Figure 2 and Figure 3 This invention provides a cover plate assembly 110, which includes a cover plate body 111 and a resonant tube 112, wherein the resonant tube 112 is integrally connected to the cover plate body 111.

[0036] The cover plate body 111 has a deformation region 113, which is used to receive the pushing and pulling action of adjustment force to adjust the position of the resonant tube 112 relative to the cover plate body 111, thereby adjusting the radio frequency parameters. The deformation region 113 is the area on the cover plate body 111 surrounding the resonant tube 112. The material thickness of the deformation region 113 is less than the material thickness of the cover plate body 111. The deformation region 113 is in the shape of a single-ring groove (see...). Figure 2 ) or in the form of multiple concentric grooves (see Figure 3 In a specific embodiment, the thickness of the deformable region 113 can be 0.3-0.5 mm.

[0037] The resonant tube 112 includes an annular wall 114 and a bottom wall 115. The top end of the annular wall 114 is connected to the cover plate body 111, and the bottom end of the annular wall 114 is connected to the bottom wall 115. The annular wall 114 can be further coupled to the fly rod.

[0038] Please continue reading. Figure 2 and Figure 3 The present invention also provides a cavity filter, which includes a cavity 120, the aforementioned cover plate assembly 110, and an input / output component (not shown in the figure).

[0039] The cover plate assembly 110 seals the cavity 120 by welding or screw fixing to form a resonant cavity 125.

[0040] Please see Figure 4 This invention also provides a cover plate assembly 210, which includes a cover plate body 211 and a resonant tube 212, wherein the resonant tube 212 is riveted to the cover plate body 211. The cover plate body 211 has a connection hole 222, and the resonant tube 212 extends from the lower surface of the cover plate body 211 through the connection hole 222 and is riveted to the upper surface of the cover plate body 211.

[0041] The cover plate body 211 has a deformation region 213, which is used to receive the pushing and pulling action of adjustment force to adjust the position of the resonant tube 212 relative to the cover plate body 211, thereby adjusting the radio frequency parameters. The deformation region 213 is the area on the cover plate body 211 surrounding the resonant tube 212. The material thickness of the deformation region 213 is less than the material thickness of the cover plate body 211. The deformation region 213 is in the form of a single-ring groove or multiple-ring grooves.

[0042] The resonant tube 212 includes an annular wall 214 and a bottom wall 215. The bottom end of the annular wall 214 is connected to the bottom wall 215. The top end of the annular wall 214 is provided with a limiting platform 217, a through portion 218, and a riveting edge 219 connected in sequence. The limiting platform 217 is in a limiting abutment fit with the lower surface of the cover plate body 211. The through portion 218 passes through the connecting hole 222. The riveting edge 219 is arranged opposite to the limiting platform 217 and riveted to the upper surface of the cover plate body 211. The bottom wall 215 further extends to have a flange portion 216. The annular wall 214 can be further coupled with the fly rod.

[0043] Please continue reading. Figure 4 The present invention also provides a cavity filter, which includes a cavity 220, the aforementioned cover plate assembly 210, and an input / output component (not shown in the figure).

[0044] The cover plate assembly 210 seals the cavity 220 by welding or screw fixing to form a resonant cavity 225.

[0045] Please see Figure 5This invention also provides a cover plate assembly 310, which includes a cover plate body 311 and a resonant tube 312, with the resonant tube 312 connected to the cover plate body 311. The cover plate body 311 has a connection hole 319. The resonant tube 312 extends from the lower surface of the cover plate body 311 into the connection hole 319 and is threaded, crimped, or welded to the connection hole 319. These three connection methods can be used individually, or a welding process can be added to the threaded or crimped connection methods to improve the connectability.

[0046] The cover plate body 311 has a deformation region 313, which is used to receive the pushing and pulling action of adjustment force to adjust the position of the resonant tube 312 relative to the cover plate body 311, thereby adjusting the radio frequency parameters. The deformation region 313 is the area on the cover plate body 311 surrounding the resonant tube 312. The material thickness of the deformation region 313 is less than the material thickness of the cover plate body 311. The deformation region 313 is in the form of a single-ring groove or multiple-ring grooves.

[0047] The resonant tube 312 includes an annular wall 314 and a bottom wall 315. The bottom end of the annular wall 314 is connected to the bottom wall 315. When a press-fit connection is used, the top end of the annular wall 314 extends sequentially with a fitting groove 317 and a guide platform 318. The outer diameter of the annular wall 314 is larger than the diameter of the connecting hole 319, the outer diameter of the fitting groove 317 is smaller than the diameter of the connecting hole 319, and the diameter of the guide platform 318 is between the outer diameter of the annular wall 314 and the outer diameter of the fitting groove 317. The guide platform 318 can be interference-fitted with the connecting hole 319. The outer periphery of the guide platform 318 can be provided with a knurled surface or a gear surface to increase the connection stability. The resonant tube 312 and the cover plate body 311 are tightly fitted by pressing. When the resonant tube 312 and the cover plate body 311 are pressed, part of the material of the cover plate body 311 is deformed and embedded in the fitting groove 317. The bottom wall 315 further extends with a flange portion 316. The annular wall 314 can be further coupled with the fly rod.

[0048] Please continue reading. Figure 5 The present invention also provides a cavity filter, which includes a cavity 320, the aforementioned cover plate assembly 310, and an input / output component (not shown in the figure).

[0049] The cover plate assembly 310 seals the cavity 320 by welding or screw fixing to form a resonant cavity 325.

[0050] Please refer to the following: Figure 6 and Figure 7 This embodiment provides a cover plate assembly 410, which includes a cover plate body 411 and a resonant tube 412. The lower surface of the cover plate body 411 is provided with a connecting cylinder 417, and the resonant tube 412 is connected to the connecting cylinder 417. Specifically, the connection can be made by riveting, snap-fitting, welding, threaded connection, or other connection methods.

[0051] The upper surface of the cover plate body 411 is provided with a recessed assembly cavity 418. The cover plate assembly 410 also includes an elastic piece 431 and an adjusting screw 432 that is spirally connected to the elastic piece 431. The assembly cavity 418 may be a constricted assembly cavity, and the assembly cavity 418 may have a clearance notch to facilitate the alignment and insertion of the elastic piece 431 into the assembly cavity 418. After the elastic piece 431 is inserted into the assembly cavity 418, it can be rotated at a certain angle to prevent it from falling out and to be fixedly assembled in the assembly cavity 418. The adjusting screw 432 is used to abut against the area of ​​the cover plate body 411 where the connecting cylinder 417 is provided to adjust the position of the resonant tube 412 relative to the cover plate body 411, thereby adjusting the radio frequency parameters. It can be understood that since the resonant tube 412 moves up and down as a whole during the adjustment process, the resonant tube 412 itself does not deform, which can achieve the effect of maintaining the consistency of filter parameters.

[0052] Of course, this embodiment can also adopt the adjustment method in the aforementioned embodiments, that is, the cover plate body 411 is provided with a deformation area, which is used to receive the pushing and pulling action of the adjustment force to adjust the position of the resonant tube 412 relative to the cover plate body 411, thereby adjusting the radio frequency parameters. The deformation area is the area on the cover plate body 411 surrounding the resonant tube 412. The material thickness of the deformation area is less than the material thickness of the cover plate body 411. The deformation area is in the form of a single-ring groove or multiple-ring grooves.

[0053] The resonant tube 412 includes an annular wall 414 and a bottom wall 415. The top end of the annular wall 414 is connected to the connecting cylinder 417, and the bottom end of the annular wall 414 is connected to the bottom wall 415. The bottom wall 415 further extends to have a flange 416. The annular wall 414 can be further coupled to the fly rod.

[0054] like Figure 7 As shown, the elastic sheet 431 includes a disc body 433, a threaded sleeve 434 located in the central region of the disc body 433, multiple bent protrusions 435 located in the edge region of the disc body 433, and multiple through holes 436 located between the threaded sleeve 434 and the bent protrusions 435. The threaded sleeve 434 is used to screw onto the adjusting screw 432, the bent protrusions 435 give the elastic sheet 431 a certain degree of elasticity, and the through holes 436 can appropriately reduce the amount of material.

[0055] Please continue reading. Figure 6 and Figure 7 The present invention also provides a cavity filter, which includes a cavity 420, the aforementioned cover plate assembly 410, and an input / output component (not shown in the figure).

[0056] The cover plate assembly 410 seals the cavity 420 by welding or screw fixing to form a resonant cavity 425.

[0057] Please see Figure 8The present invention also provides a cover plate assembly 510, which includes a cover plate body 511 and a resonant tube 512, wherein the resonant tube 512 is connected to the cover plate body 511.

[0058] The cover plate body 511 has a deformation region 513, which is used to receive the pushing and pulling action of adjustment force to adjust the position of the resonant tube 512 relative to the cover plate body 511, thereby adjusting the radio frequency parameters. The deformation region 513 is the area on the cover plate body 511 surrounding the resonant tube 512. The material thickness of the deformation region 513 is less than the material thickness of the cover plate body 511. The deformation region 513 is in the form of a single-ring groove or multiple-ring grooves.

[0059] The resonant tube 512 includes an annular wall 514 and a bottom wall 515. The top end of the annular wall 514 is connected to the cover plate body 511, and the bottom end of the annular wall 514 is connected to the bottom wall 515. The bottom wall 515 further extends to a flange 516. A fly rod 517 is further connected to the annular wall 514.

[0060] Please continue reading. Figure 8 The present invention also provides a cavity filter, which includes a cavity 520, the aforementioned cover plate assembly 510, and an input / output component (not shown in the figure).

[0061] The cavity 520 is provided with a partition 521, and the partition 521 has a slot 522 for avoiding the flying rod 517; the cover plate assembly 510 seals the cavity 520 by welding or screw fixing to form a resonant cavity 525.

[0062] In other embodiments, the fly rod 517 may also be suspended in the slot 522 by an insulating element and capacitively coupled to the resonant tube 512.

[0063] Please see Figure 9 The present invention also provides a cover plate assembly 710, which includes a cover plate body 711 and a resonant tube 712, wherein the resonant tube 712 is connected to the cover plate body 711.

[0064] The cover plate body 711 has a deformation region 713, which is used to receive the pushing and pulling action of adjustment force to adjust the position of the resonant tube 712 relative to the cover plate body 711, thereby adjusting the radio frequency parameters. The deformation region 713 is the area on the cover plate body 711 surrounding the resonant tube 712. The material thickness of the deformation region 713 is less than the material thickness of the cover plate body 711. The deformation region 713 is in the form of a single-ring groove or multiple-ring grooves.

[0065] Please continue reading. Figure 9 The present invention also provides a cavity filter, which includes a cavity 720, the aforementioned cover plate assembly 710, a first input / output component 714, and a second input / output component 718.

[0066] The cover plate assembly 710 seals the cavity 720 by welding or screw fixing to form a resonant cavity 725. A first input / output component 714 extends into the resonant cavity 725 through the cavity 720 and / or the cover plate body 710 and is capacitively coupled to the resonant tube 712 via a coupling rod 717. The first input / output component 714 is fixedly assembled via a first insulator 715 and a second insulator 716. The coupling rod 717 can be sleeved on the first input / output component 714 and clamped and fixed by the first insulator 715 and the second insulator 716. A second input / output component 718 can be a low-pass rod, fixed by an assembly cylinder 721 connected to the cover plate body 711 and capacitively coupled to the resonant tube 712 via a coupling rod 719.

[0067] In other embodiments, the first input / output element 714 and the second input / output element 718 may also contact the resonant tube 712 to form an inductive coupling connection.

[0068] Please see Figure 10 The present invention also provides a cavity filter, which includes a cover plate assembly 910 and a cavity 920.

[0069] The cover plate assembly 910 includes a cover plate body 911 and a plurality of resonant tubes 912. The plurality of resonant tubes 912 are connected to the cover plate body 911 in various ways as described in the previous embodiments. The cover plate body 911 has a deformation region 913, which is used to receive adjusting forces to adjust the position of the resonant tubes 912 relative to the cover plate body 911, thereby adjusting the radio frequency parameters. The deformation region 913 is the area on the cover plate body 911 surrounding the resonant tubes 912. The material thickness of the deformation region 913 is less than the material thickness of the cover plate body 911. The deformation region 913 is in the form of a single-ring groove or multiple-ring grooves. The cover plate assembly 910 seals the cavity 920 by welding or screw fixing to form a resonant cavity.

[0070] This invention also provides a communication device, which includes the aforementioned cavity filter. The communication device is at least one of a duplexer, simplexer, splitter, combiner, or tower-top amplifier.

[0071] Please refer to the following: Figure 10 and Figure 11 The present invention also provides an adjustment device for applying an adjustment force to the aforementioned cover plate assembly. The adjustment device includes a bracket and an adjustment member 960 slidably disposed on the bracket. The adjustment member 960 is used to apply a downward pressure or an upward pull force to the cover plate body or the resonant tube to adjust the position of the resonant tube relative to the cover plate body.

[0072] In one embodiment, the adjusting member 930 is a telescopic cylinder, which includes a cylinder body 961 and a cylinder rod 962 telescopically connected to the cylinder body 961. The cylinder body 961 is slidably arranged by a bracket, and the cylinder rod 962 is used to apply an adjusting force to adjust the position of the resonant tube relative to the cover plate body.

[0073] As mentioned earlier, the cover plate body is provided with a deformation zone (e.g. Figure 10 The deformation zone 913 in the middle), the deformation zone is the cover plate body (e.g. Figure 10 The cover plate body 911 in the middle surrounds the resonant tube (e.g. Figure 10 The area surrounding the resonant tube 912 in the middle, correspondingly, the free end of the cylinder rod 962 can be in the shape of a convex ring. The deformation area can be in the shape of a single-ring groove or multiple-ring grooves, and correspondingly, the free end of the cylinder rod 962 can be in the shape of a single-ring convex ring or multiple-ring convex rings.

[0074] In one embodiment, to facilitate upward adjustment, a lifting member may be provided on the deformation zone, and a pulling member is correspondingly provided on the free end of the cylinder rod 962. The pulling member and the lifting member cooperate to apply an upward adjustment force. The pulling member and the lifting member may be components such as a lifting ring or a hook.

[0075] The resonant tube includes an annular wall and a bottom wall. The top end of the annular wall is connected to the cover plate body, and the bottom end of the annular wall is connected to the bottom wall. In one embodiment, the cylinder rod 962 can act on the bottom wall to apply a downward adjustment force.

[0076] Similarly, to facilitate upward adjustment, a lifting component can be provided on the bottom wall, and a corresponding pulling component is provided at the free end of the cylinder rod 962. The pulling component and the lifting component cooperate to apply an upward adjustment force. The pulling component and the lifting component can be components such as a lifting ring or a hook.

[0077] In one embodiment, the support includes a base plate 930 and a slide rail disposed on the base plate 930. The slide rail and the base plate 930 form a deformation area for placing a cavity filter. An adjustment member 960 is disposed on the slide rail.

[0078] Specifically, the slide rail includes a first slide rail 940 disposed on the base plate 930, a second slide rail 950 slidably disposed on the first slide rail 940 in a first direction, and an adjusting member 960 slidably disposed on the second slide rail 950 in a second direction. The first direction and the second direction are perpendicular to each other.

[0079] The first slide rail 940 includes two parallel slide rails spaced apart on the base plate 930. The top of the first slide rail 940 is provided with a first groove 941 along a first direction. The second slide rail 950 may be frame-shaped. The bottom of the second slide rail 950 is provided with a slider 951 that matches the first groove 941 along a first direction. The first groove 941 and the slider 951 may be a dovetail groove or a T-groove mating structure. The inner surfaces of the second slide rail 950 opposite each other are provided with a second groove 952 along a second direction. The adjusting member 960 is slidably assembled based on the second groove 952.

[0080] The adjusting component 960 can be used to apply downward pressure to any deformation zone 913 or to apply upward pulling force through hooking or vacuum adsorption to adjust the RF parameters of the cavity filter. The tuning device provided by this invention is separated from the cavity filter after adjustment, which avoids the problem in the prior art where the tuning screw remains mounted on the cover plate after adjustment, making it prone to loosening or misoperation that could affect the adjusted RF parameters.

[0081] It is understood that in the above embodiments, when the resonant tube and the cover plate are integrally formed, welded, riveted or pressed, the cylinder rod 962 can act on the bottom of the resonant tube or the deformation area, depending on the situation. When the resonant tube 412 and the cover plate body 411 are connected by the connecting cylinder 417, the cylinder rod 962 can act on the adjusting screw 432. At this time, the resonant tube 412 moves up and down as a whole, and the resonant tube 412 itself does not deform, which can achieve the effect of maintaining the consistency of filter parameters.

[0082] In summary, those skilled in the art will readily understand that the cavity filter and its cover plate assembly, as well as the communication device including the cavity filter, provided by the present invention, can reduce the number of structural components inside the resonant cavity and optimize radio frequency modulation by connecting the resonant tube and the cover plate to form a cover plate assembly.

[0083] The above are merely embodiments of the present invention and do not limit the scope of the patent. Any equivalent structural or procedural transformations made based on the description and drawings of the present invention, or direct or indirect applications in other related technical fields, are similarly included within the scope of patent protection of the present invention.

Claims

1. A cover plate assembly, characterized in that, The cover plate assembly includes a cover plate body and a resonant tube. A connecting cylinder is provided on the lower surface of the cover plate body, and the resonant tube is connected to the connecting cylinder. The upper surface of the cover plate body is provided with a recessed assembly cavity. The cover plate assembly also includes an elastic sheet and an adjusting screw that is spirally connected to the elastic sheet. The assembly cavity is used to install and prevent the elastic sheet from falling off and to limit its position. The adjusting screw is used to abut against the area of ​​the cover plate body where the connecting cylinder is provided, so as to adjust the position of the resonant tube relative to the cover plate body.

2. The cover plate assembly according to claim 1, characterized in that, The elastic plate includes a disc body, a threaded sleeve located in the central region of the disc body, a plurality of bent protrusions located in the edge region of the disc body, and a plurality of through holes located between the threaded sleeve and the bent protrusions. The threaded sleeve is used to screw onto the adjusting screw.

3. The cover plate assembly according to claim 1, characterized in that, The resonant tube includes an annular wall and a bottom wall. The top end of the annular wall is connected to the connecting cylinder, and the bottom end of the annular wall is connected to the bottom wall.

4. The cover plate assembly according to claim 3, characterized in that, The bottom wall extends further to include a flange.

5. The cover plate assembly according to claim 4, characterized in that, A flying rod is further connected to the ring wall.

6. A cavity filter, characterized in that, The cavity filter includes: cavity; The cover plate assembly according to any one of claims 1 to 5, wherein the cover plate assembly seals the cavity by welding or screw fixing to form a resonant cavity; The input / output component extends into the resonant cavity through the cavity and / or the cover plate body and is capacitively or inductively coupled to the resonant tube.

7. A communication device, characterized in that, The communication device includes the cavity filter of claim 6, and the communication device is at least one of a duplexer, simplexer, splitter, combiner, or tower-top amplifier.

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