filter

Abstract

The application relates to the field of radio frequency devices, and provides a filter, which comprises a cavity, a cover plate, a resonant rod and a dielectric piece. One end of the resonant rod is connected with the cavity, the other end of the resonant rod is arranged in a spaced mode with the cover plate, and the dielectric piece is arranged between the resonant rod and the cover plate; or one end of the resonant rod is connected with the cover plate, the other end of the resonant rod is arranged in a spaced mode with a resonant wall, the resonant wall is an inner wall of a side of the cavity opposite to the cover plate, and the dielectric piece is arranged between the resonant rod and the resonant wall. The dielectric constant of the dielectric piece is greater than that of air. The filter can increase the effective dielectric constant, enhance the flat plate capacitance, reduce the resonant frequency through the dielectric piece with the dielectric constant greater than that of air, and thus the intermodulation stability and the power index of the filter can be effectively improved.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of radio frequency devices, and particularly relates to a filter. BACKGROUND

[0002] The existing filter generally comprises a cavity, a cover plate covering the cavity, a resonant rod arranged in the cavity, and a tuning screw rod mounted on the cover plate. There is a gap between the resonant rod and the cover plate, and a flat plate capacitor is formed. The size of the flat plate capacitor can be changed by screwing in or out the tuning screw rod, so as to adjust the resonant frequency. Based on this, the existing filter can have certain intermodulation stability and power index. However, with the development of communication technology, it is necessary to further improve the intermodulation stability and power index of the filter. SUMMARY

[0003] The purpose of the embodiment of the application is to provide a filter to improve the intermodulation stability and power index of the existing filter.

[0004] To achieve the above purpose, the technical scheme adopted by the application is as follows: a filter comprising:

[0005] a cavity;

[0006] a cover plate covering the cavity;

[0007] a resonant rod arranged in the cavity, one end of the resonant rod being connected with the cavity, and the other end of the resonant rod being spaced apart from the cover plate;

[0008] a dielectric piece arranged between the resonant rod and the cover plate, the dielectric piece having a dielectric constant greater than that of air.

[0009] In one embodiment, the dielectric piece is connected to the resonant rod, and the side of the dielectric piece away from the resonant rod is spaced apart from the cover plate.

[0010] In one embodiment, the dielectric piece is connected to the resonant rod, and the side of the dielectric piece away from the resonant rod is spaced apart from the cover plate.

[0011] In one embodiment, the dielectric piece comprises a dielectric body mounted on the end face of the resonant rod close to the cover plate, and a dielectric ring connected to the periphery of the dielectric body and extending in the direction close to the resonant rod, the dielectric piece being arranged on the end of the resonant rod close to the cover plate.

[0012] In one embodiment, the side of the dielectric body close to the resonant rod is provided with an opening, the side of the resonant rod close to the dielectric body is provided with a protrusion, and the protrusion is inserted into the opening; or,

[0013] The medium body is provided with a protrusion on the side close to the resonant rod, and the resonant rod is provided with an opening on the side close to the medium body, and the protrusion is inserted into the opening.

[0014] In one embodiment, the medium member is connected to the cover plate, and the side of the medium member away from the cover plate is arranged to be spaced apart from the resonant rod.

[0015] In one embodiment, the cover plate has a tuning portion arranged to correspond to the resonant rod and capable of being deformed by force.

[0016] In one embodiment, the filter further comprises a tuning screw threadedly connected to the cover plate and arranged to correspond to the resonant rod.

[0017] In one embodiment, the cover plate comprises a tuning plate arranged to correspond to the resonant rod and capable of being deformed by force, and a protective plate connected to the tuning plate and covering the cavity together with the tuning plate.

[0018] The purpose of the embodiments of the present application is also to provide a filter comprising:

[0019] a cavity;

[0020] a cover plate covering the cavity;

[0021] a resonant rod arranged in the cavity, one end of the resonant rod being connected to the cover plate, and the other end of the resonant rod being arranged to be spaced apart from a resonant wall, the resonant wall being an inner wall of the side of the cavity opposite to the cover plate;

[0022] a medium member arranged between the resonant rod and the resonant wall, the dielectric constant of the medium member being greater than that of air.

[0023] In one embodiment, the medium member is connected to the resonant rod, and the side of the medium member away from the resonant rod is arranged to be spaced apart from the resonant wall.

[0024] In one embodiment, the medium member is connected to the resonant rod, and the side of the medium member away from the resonant rod is arranged to be spaced apart from the resonant wall.

[0025] In one embodiment, the medium member comprises a medium body mounted on the end face of the resonant rod close to the resonant wall, and a medium ring connected to the periphery of the medium body and extending in the direction close to the resonant rod to form a cover on the end of the resonant rod close to the resonant wall.

[0026] In one embodiment, the medium body is provided with an opening on the side close to the resonant rod, and the resonant rod is provided with a protrusion on the side close to the medium body, and the protrusion is inserted into the opening; or,

[0027] The medium body is provided with a protrusion on the side close to the resonant rod, and the resonant rod is provided with an opening on the side close to the medium body, and the protrusion is inserted into the opening.

[0028] In one embodiment, the medium member is connected to the resonant wall, and the side of the medium member away from the resonant wall is arranged to be spaced apart from the resonant rod.

[0029] In one embodiment, the cover plate has a tuning part arranged to correspond to the resonant rod and capable of being deformed by force.

[0030] In one embodiment, the filter further comprises a connecting screw threadedly connected to the cover plate and connecting the resonant rod to the cover plate.

[0031] In one embodiment, the cover plate comprises a tuning plate arranged to correspond to the resonant rod and capable of being deformed by force, and a protection plate connected to the tuning plate and covering the cavity together with the tuning plate.

[0032] The filter provided by the present application has the following beneficial effects:

[0033] The filter provided by the present application has the following beneficial effects: BRIEF DESCRIPTION OF DRAWINGS

[0034] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed in the embodiments or prior art description will be briefly introduced as follows. 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 based on these drawings.

[0035] Figure 1 The filter provided by the present application has the following beneficial effects:

[0036] Figure 2 Provided is Figure 1 an exploded view of the filter;

[0037] Figure 3 Provided is Figure 1 a sectional view of the filter;

[0038] Figure 4 a structural schematic view of the filter provided in Embodiment Two of the present application;

[0039] Figure 5 a structural schematic view of the filter provided in Embodiment Three of the present application;

[0040] Figure 6 a structural schematic view of the filter provided in Embodiment Four of the present application;

[0041] Figure 7 a structural schematic view of the filter provided in Embodiment Five of the present application;

[0042] Figure 8 a structural schematic view of the filter provided in Embodiment Six of the present application Figure 1 , wherein the dielectric member is connected to the resonant rod;

[0043] Figure 9 a structural schematic view of the filter provided in Embodiment Six of the present application Figure 2 , wherein the dielectric member is connected to the cover plate;

[0044] Figure 10 a structural schematic view of the filter provided in Embodiment Seven of the present application Figure 1 , wherein the dielectric member is connected to the resonant rod;

[0045] Figure 11 a structural schematic view of the filter provided in Embodiment Seven of the present application Figure 2 , wherein the dielectric member is connected to the cover plate;

[0046] Figure 12 a structural schematic view of the filter provided in Embodiment Eight of the present application;

[0047] Figure 13 a structural schematic view of the filter provided in Embodiment Nine of the present application;

[0048] Figure 14 a structural schematic view of the filter provided in Embodiment Ten of the present application;

[0049] Figure 15 a structural schematic view of the filter provided in Embodiment Eleven of the present application;

[0050] Figure 16 a structural schematic view of the filter provided in Embodiment Twelve of the present application;

[0051] Figure 17 Structure diagram of filter provided for embodiment thirteen of the present application Figure 1 Wherein the medium member is connected to the resonant rod.

[0052] Figure 18 Structure diagram of filter provided for embodiment thirteen of the present application Figure 2 Wherein the medium member is connected to the resonant wall.

[0053] Figure 19 Structure diagram of filter provided for embodiment fourteen of the present application Figure 1 Wherein the medium member is connected to the resonant rod.

[0054] Figure 20 Structure diagram of filter provided for embodiment fourteen of the present application Figure 2 Wherein the medium member is connected to the resonant wall.

[0055] Wherein the various reference signs in the figures:

[0056] 10-cavity, 11-resonant cavity, 12-resonant wall; 20-cover plate, 21-tuning part, 22-tuning plate, 23-protection plate, 231-second through hole; 30-resonant rod, 31-protrusion; 40-medium member, 41-medium body, 411-opening, 42-medium ring, 43-first through hole, 44-medium block; 50-tuning screw; 60-connecting screw; 70-adjusting structure. DETAILED DESCRIPTION

[0057] In order to make the technical problems to be solved by the present application, the technical solutions and beneficial effects clearer and more apparent, the present application will be further described in detail below in combination with the drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and not intended to limit the present application.

[0058] In the description of the present application, it should be understood that the terms "length", "width", "upper", "lower", "front", "rear", "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 for the convenience of describing the present application and simplifying the description, and are not intended to indicate or imply 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 a limitation on the present application.

[0059] In addition, the terms "first", "second", etc. are used only for the purpose of description, and should not be understood as indicating or implying relative importance or implying the number of the technical features indicated. Therefore, the features defined as "first", "second" can explicitly or implicitly include one or more of the features. In the description of the present application, the meaning of "a plurality of" is two or more, unless otherwise explicitly specified and limited.

[0060] In the present application, unless otherwise explicitly specified and limited, the terms "mounting", "connecting", "connecting", "fixing" and the like should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or it can be integrated; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the internal communication of two elements or the interaction relationship between two elements. For those skilled in the art, the specific meaning of the above-mentioned terms in the present application can be understood according to the specific circumstances.

[0061] The existing filter generally includes a cavity, a cover plate covering the cavity, a resonant rod arranged in the cavity, and a tuning screw rod mounted on the cover plate. There is a gap between the resonant rod and the cover plate and forms a plate capacitor. By screwing in or out the tuning screw rod, the size of the plate capacitor can be changed to adjust the resonant frequency. Based on this, the existing filter can have certain intermodulation stability and power index. However, with the development of communication technology, it is necessary to further improve the intermodulation stability and power index of the filter.

[0062] Therefore, the embodiments of the present application provide a filter which relatively improves the intermodulation stability and power index.

[0063] The specific implementation of the present application is described in more detail in combination with specific embodiments as follows:

[0064] Embodiment one

[0065] Please refer to Figure 1 , Figure 2 , Figure 3 The embodiments of the present application provide a filter, which includes a cavity 10, a cover plate 20, a resonant rod 30 and a dielectric piece 40. The cover plate 20 covers the cavity 10; the resonant rod 30 is arranged in the cavity 10, one end of the resonant rod 30 is connected with the cavity 10, and the other end of the resonant rod 30 is spaced apart from the cover plate 20; the dielectric piece 40 is arranged between the resonant rod 30 and the cover plate 20, and the dielectric constant of the dielectric piece 40 is greater than that of air.

[0066] It should be noted that the cavity 10 has a resonant cavity 11, and the cover plate 20 covers the cavity 10, especially the resonant cavity 11, to achieve a shielding function to prevent signal leakage. The resonant cavity 11 is provided with a resonant rod 30, one end of the resonant rod 30 being connected to the cavity 10. The resonant rod 30 can be connected to the cavity 10 by welding, integral connection, riveting, pressure connection, screw fastening, threaded connection, clamping, etc. The present embodiment does not limit this.

[0067] The resonant rod 30 can be a metal resonant rod, a ceramic dielectric resonant rod, or a dielectric resonant rod of other materials. The resonant rod 30 can be a circular rod, a polygonal rod, a special-shaped rod, a coil resonant rod, a sheet resonant rod, a sheet metal resonant rod, or a resonant rod of other shapes. The resonant rod 30 can be a hollow resonant rod or a solid resonant rod. The resonant rod 30 can have a resonant disc or not. The resonant disc can have a flange or not. The present embodiment does not limit this.

[0068] The cavity 10 can be an integral structure or a split connection structure. The present embodiment does not limit this.

[0069] In actual application scenarios, the filter can be placed with the cover plate 20 facing up, or placed with the cover plate 20 facing left, right, front, or back. The present embodiment does not limit this.

[0070] It should also be noted that the cover plate 20 and the resonant rod 30 are oppositely arranged and spaced apart from the end of the resonant rod 30 away from the cavity 10, and a plate capacitor is formed between the cover plate 20 and the resonant rod 30.

[0071] The dielectric piece 40 is arranged between the resonant rod 30 and the cover plate 20. The dielectric constant of the dielectric piece 40 is greater than that of air. Based on this, the effective dielectric constant between the resonant rod 30 and the cover plate 20 can be increased by the dielectric piece 40, the plate capacitor between the resonant rod 30 and the cover plate 20 can be enhanced, the resonant frequency can be reduced, and the intermodulation stability and power index of the filter can be effectively improved. The production pass rate of the filter can be correspondingly improved, the scrap rate and maintenance cost of the filter can be reduced, and the market competitiveness of the filter can be improved.

[0072] In conclusion, the filter provided by the embodiment of the present application sets the resonant rod 30 in the space enclosed by the cavity 10 and the cover plate 20, connects one end of the resonant rod 30 to the cavity 10, and sets the other end of the resonant rod 30 apart from the cover plate 20, so as to form a plate capacitor between the cover plate 20 and the resonant rod 30. On this basis, the dielectric member 40 with a dielectric constant greater than that of air is additionally arranged between the resonant rod 30 and the cover plate 20, so as to increase the effective dielectric constant between the resonant rod 30 and the cover plate 20, thereby enhancing the plate capacitor between the resonant rod 30 and the cover plate 20, reducing the resonant frequency, and effectively improving the intermodulation stability and power index of the filter. Accordingly, the production pass rate of the filter can be improved, the scrappage rate and maintenance cost of the filter can be reduced, and the market competitiveness of the filter can be improved.

[0073] Please refer to Figure 1 , Figure 2 , Figure 3 In the embodiment, the dielectric member 40 is connected to the resonant rod 30, and the side of the dielectric member 40 away from the resonant rod 30 is arranged apart from the cover plate 20.

[0074] It should be noted that the side of the dielectric member 40 close to the resonant rod 30 can be fixedly connected to the resonant rod 30 by means of, but not limited to, bonding, welding, riveting, and crimping, or can be detachably connected to the resonant rod 30 by means of, but not limited to, sleeving, clamping, and threaded connection, and the embodiment does not limit this.

[0075] The side of the medium piece 40 away from the resonant rod 30 is spaced apart from the cover plate 20, and based on this, the air between the cover plate 20 and the resonant rod 30, between the cover plate 20 and the medium piece 40, can be taken as a first layer of medium layer, and the medium piece 40 can be taken as a second layer of medium layer, so as to uniformly and controllably increase the effective dielectric constant between the resonant rod 30 and the cover plate 20, uniformly and controllably enhance the plate capacitor between the resonant rod 30 and the cover plate 20, uniformly and controllably reduce the resonant frequency, and uniformly and controllably improve the intermodulation stability and power index of the filter. Specifically, the effective dielectric constant between the resonant rod 30 and the cover plate 20 can be changed by changing the thickness of the medium piece 40 between the resonant rod 30 and the cover plate 20 and / or changing the dielectric constant of the medium piece 40. In addition, the side of the medium piece 40 away from the resonant rod 30 is spaced apart from the cover plate 20 in the present application, so that the medium piece 40 can be prevented from being tightly abutted between the cover plate 20 and the resonant rod 30, an additional elastic abutting piece does not need to be arranged, the material can be reduced, the cost can be reduced, and installation is facilitated. At the same time, the medium piece 40 is directly connected to the resonant rod 30, so that the problem that the medium piece 40 is loosened or even falls off during transportation or use of the filter, and then the performance index of the filter is damaged, can be avoided, the installation stability of the medium piece 40 can be improved, and then the stability and reliability of the filter can be increased, and the failure probability of the filter can be reduced.

[0076] Please refer to Figure 1 , Figure 2 , Figure 3 In the present embodiment, the medium piece 40 is connected to the resonant rod 30 by dispensing.

[0077] By using the above scheme, the medium piece 40 can be conveniently, reliably and firmly fixed and connected to the resonant rod 30 in a regional dispensing or multi-point dispensing or continuous dispensing manner, based on which the installation stability of the medium piece 40 can be effectively improved, the risk that the medium piece 40 is loosened or even falls off during transportation or use of the filter can be effectively reduced, and then the stability and reliability of the filter can be effectively increased, and the failure probability of the filter can be effectively reduced.

[0078] Please refer to Figure 1 , Figure 2 , Figure 3 In the present embodiment, the medium piece 40 includes a medium body 41 mounted on the end face of the resonant rod 30 close to the cover plate 20, and a medium ring 42 connected to the periphery of the medium body 41 and extending in the direction close to the resonant rod 30, and the medium piece 40 covers the end of the resonant rod 30 close to the cover plate 20.

[0079] By adopting the above scheme, the medium piece 40 is in a cap shape and covers the end of the resonant rod 30 close to the cover plate 20, and the connection to the resonant rod 30 is achieved simply and quickly. Specifically, the medium piece 40 can be limited from moving circumferentially relative to the resonant rod 30 by the medium ring 42 sleeved on the circumferential side of the resonant rod 30, and the position and state of the medium piece 40 relative to the resonant rod 30 are positioned, determined and stabilized; and the medium body 41 arranged on the side of the resonant rod 30 close to the cover plate 20 can reliably and effectively increase the effective dielectric constant between the resonant rod 30 and the cover plate 20, enhance the plate capacitance between the resonant rod 30 and the cover plate 20, reduce the resonant frequency, and improve the intermodulation stability and power index of the filter.

[0080] Please refer to Figure 3 、 Figure 6 、 Figure 4 In the embodiment, the cover plate 20 is a single-layer cover plate, and the cover plate 20 has a tuning part 21 arranged correspondingly to the resonant rod 30 and capable of being deformed by force.

[0081] Based on the arrangement of the embodiment, the filter can be tuned and the resonant frequency can be adjusted. Specifically, when a pushing force is applied to the tuning part 21, the tuning part 21 can be deformed towards the side close to the resonant rod 30 to shorten the distance between the tuning part 21 and the resonant rod 30; conversely, when a pulling force is applied to the tuning part 21, the tuning part 21 can be deformed towards the side away from the resonant rod 30 to lengthen the distance between the tuning part 21 and the resonant rod 30; based on this, the size of the capacitance between the tuning part 21 and the resonant rod 30 can be adjusted by adjusting the distance between the tuning part 21 and the resonant rod 30, and the resonant frequency can be adjusted, which is very convenient.

[0082] As shown in Figure 5 , the embodiment can be applied to the case that the medium piece 40 is connected to the resonant rod 30 and the side of the medium piece 40 away from the resonant rod 30 is arranged spaced apart from the cover plate 20, in which case, the gap space formed between the side of the medium piece 40 away from the resonant rod 30 and the cover plate 20 can provide a deformation space for the tuning part 21 to be deformed by force towards the side close to the resonant rod 30, so as to facilitate the deformation and tuning of the tuning part 21 without obstruction. Figure 6 As shown in , the embodiment can also be applied to the case that the medium piece 40 is connected to the cover plate 20 and the side of the medium piece 40 away from the cover plate 20 is arranged spaced apart from the resonant rod 30, in which case, the gap space formed between the side of the medium piece 40 away from the cover plate 20 and the resonant rod 30 can provide a deformation space for the tuning part 21 to be deformed by force towards the side close to the resonant rod 30, so as to facilitate the deformation and tuning of the tuning part 21 without obstruction.

[0083] The tuning part 21 can be provided with an adjusting structure 70, which can be integrally connected or separately connected to the tuning part 21. In this way, during the tuning process, the operator can use fingers or external tools to apply force to the adjusting structure 70 to drive the adjusting structure 70 to axially displace, drive the tuning part 21 to deform, and further improve the convenience of adjusting the resonant frequency.

[0084] Compared with example six, in this embodiment, the tuning can be realized by the tuning part 21, and the tuning screw 50 can be omitted. On the one hand, the height of the cover plate 20 can be effectively reduced, so that the designable height of the cavity 10 can be effectively increased under the condition that the overall height of the filter is determined, and the intermodulation stability and power index of the filter can be further guaranteed and improved. On the other hand, during the tuning process, impurities such as burrs and debris can be basically avoided from falling into the cavity 10, so that the risk of short circuit and failure of the filter can be effectively reduced, and the intermodulation stability and power index of the filter can be further guaranteed and improved.

[0085] Example two

[0086] Please refer to Figure 6 In this embodiment, the medium body 41 is provided with an opening 411 on the side close to the resonant rod 30, and the resonant rod 30 is provided with a protrusion 31 on the side close to the medium body 41, and the protrusion 31 is inserted into the opening 411.

[0087] By using the above scheme, the protrusion 31 of the resonant rod 30 and the opening 411 of the medium body 41 are inserted and matched, so that the alignment accuracy between the resonant rod 30 and the medium body 41 is guaranteed and improved. Therefore, it is beneficial to accurately and evenly strengthen the effective dielectric constant and the plate capacitance between each side of the resonant rod 30 and the cover plate 20. Further, by providing the protrusion 31, the distance between the outermost end of the resonant rod 30 away from the cavity 10 and the cover plate 20 is relatively reduced, the plate capacitance between the resonant rod 30 and the cover plate 20 is relatively enhanced, so that the resonant frequency can be further reduced, and the intermodulation stability and power index of the filter can be further improved.

[0088] Alternatively, the outer circumferential wall of the protrusion 31 of the resonant rod 30 can be provided with external threads, the hole wall of the opening 411 of the medium body 41 can be provided with internal threads, and the protrusion 31 of the resonant rod 30 and the opening 411 of the medium body 41 are threadedly connected.

[0089] Example three

[0090] The difference between this embodiment and example two is that:

[0091] Please refer to Figure 7In the embodiment, the medium body 41 is provided with a protrusion 31 on the side close to the resonant rod 30, and the resonant rod 30 is provided with an opening 411 on the side close to the medium body 41, and the protrusion 31 is inserted into the opening 411.

[0092] By using the above scheme, the positioning precision between the resonant rod 30 and the medium body 41 can be guaranteed and improved by the plug-in cooperation of the opening 411 of the resonant rod 30 and the protrusion 31 of the medium body 41, and based on this, it is beneficial to the precise and balanced strengthening effect of the medium piece 40 on the effective dielectric constant and the flat plate capacitance between each side of the resonant rod 30 and the cover plate 20.

[0093] Optionally, the protrusion 31 of the medium body 41 can be provided with an external thread, the hole wall of the opening 411 of the resonant rod 30 can be provided with an internal thread, and the protrusion 31 of the medium body 41 is threadedly connected with the opening 411 of the resonant rod 30.

[0094] Embodiment four

[0095] The difference between the embodiment and the embodiment one is that:

[0096] Please refer to Figure 7 In the embodiment, the medium piece 40 is connected to the cover plate 20, and the side of the medium piece 40 away from the cover plate 20 is arranged to be spaced apart from the resonant rod 30.

[0097] It should be noted that the side of the medium piece 40 close to the cover plate 20 can be connected to the cover plate 20 by using but not limited to using bonding, welding, threaded connection, pressure connection and the like.

[0098] The medium piece 40 is arranged away from the cover plate 20 and is spaced from the resonant rod 30. Based on this, the medium piece 40 can be used as a first layer of medium between the cover plate 20 and the resonant rod 30, and the air between the medium piece 40 and the resonant rod 30 can be used as a second layer of medium. In this way, the effective dielectric constant between the resonant rod 30 and the cover plate 20 can be balanced and controllably increased, the plate capacitance between the resonant rod 30 and the cover plate 20 can be balanced and controllably increased, the resonant frequency can be balanced and controllably reduced, and the intermodulation stability and power index of the filter can be balanced and controllably improved. Specifically, the effective dielectric constant between the resonant rod 30 and the cover plate 20 can be changed by changing the thickness of the medium piece 40 between the resonant rod 30 and the cover plate 20 and / or changing the dielectric constant of the medium piece 40. In addition, the medium piece 40 is arranged away from the cover plate 20 and is spaced from the resonant rod 30, which can avoid abutting the medium piece 40 between the cover plate 20 and the resonant rod 30, does not need to arrange an additional elastic abutting piece, can reduce materials and cost, and is convenient to install. At the same time, the medium piece 40 is directly connected to the cover plate 20, which can also avoid the problem that when the medium piece 40 is abutted between the cover plate 20 and the resonant rod 30, the medium piece 40 is loose or even falls off during transportation or use of the filter, thereby damaging the performance index of the filter. In this way, the installation stability of the medium piece 40 can be improved, and the stability and reliability of the filter can be increased, and the probability of failure of the filter can be reduced.

[0099] Please refer to Figure 8 In this embodiment, the medium piece 40 is connected to the cover plate 20 by point gluing.

[0100] By using the above scheme, the medium piece 40 can be conveniently, reliably and firmly fixed and connected to the cover plate 20 by regional point gluing, multi-point point gluing or continuous point gluing. Based on this, the installation stability of the medium piece 40 can be effectively improved, the risk of loosening or even falling off of the medium piece 40 during transportation or use of the filter can be effectively reduced, and the stability and reliability of the filter can be effectively increased, and the probability of failure of the filter can be effectively reduced.

[0101] Embodiment five

[0102] The difference between this embodiment and embodiments one and four is that:

[0103] Please refer to Figure 9 In this embodiment, the medium piece 40 includes a plurality of medium blocks 44 arranged in sequence along the axis between the resonant rod 30 and the cover plate 20. At least part of the medium blocks 44 have different dielectric constants.

[0104] By adopting the above scheme, the plurality of medium blocks 44 can form a plurality of medium layers between the cover plate 20 and the resonant rod 30, the dielectric constants of the plurality of medium blocks 44 are different, and based on this, the effective dielectric constant between the resonant rod 30 and the cover plate 20 can be balanced and controllably increased, the plate capacitance between the resonant rod 30 and the cover plate 20 can be balanced and controllably enhanced, the resonant frequency can be balanced and controllably reduced, and the intermodulation stability and power index of the filter can be balanced and controllably improved. Specifically, the effective dielectric constant between the resonant rod 30 and the cover plate 20 can be changed by changing the thickness and / or the dielectric constant of the different medium blocks 44.

[0105] Please refer to Figure 8 In the embodiment, one medium block 44 is connected to the resonant rod 30, and the other medium block 44 is connected to the cover plate 20.

[0106] It should be noted that one of the medium blocks 44 can be fixedly connected to the resonant rod 30 by means of, but not limited to, adhesion, welding, riveting, and crimping, or can be detachably connected to the resonant rod 30 by means of, but not limited to, sleeving, clamping, and threaded connection, and the embodiment does not limit this.

[0107] The other medium block 44 can be connected to the cover plate 20 by means of, but not limited to, adhesion, welding, threaded connection, and crimping, and the embodiment does not limit this.

[0108] By directly connecting one of the medium blocks 44 to the resonant rod 30 and directly connecting the other medium block 44 to the cover plate 20, the installation stability of the medium piece 40 can be stably and improved, and the stability and reliability of the filter can be improved, and the probability of failure of the filter can be reduced.

[0109] Embodiment Six

[0110] The difference between the embodiment and the embodiment one is that:

[0111] Please refer to Figure 9 , Figure 9 In the embodiment, the filter further comprises a tuning screw 50 which is threadedly connected to the cover plate 20 and correspondingly arranged with the resonant rod 30.

[0112] Based on the arrangement of the embodiment, the filter can be tuned and the resonant frequency can be adjusted. Specifically, when the tuning screw 50 is screwed in relative to the cover plate 20, the length of the portion of the tuning screw 50 which penetrates into the cavity 10 can be increased; conversely, when the tuning screw 50 is screwed out relative to the cover plate 20, the length of the portion of the tuning screw 50 which penetrates into the cavity 10 can be reduced; based on this, the resonant frequency can be adjusted by adjusting the length of the portion of the tuning screw 50 which penetrates into the cavity 10, and the adjustment is very convenient.

[0113] As shown in Figure 10 , the present embodiment can be applied to the case that the dielectric piece 40 is connected to the resonant rod 30 and the side of the dielectric piece 40 away from the resonant rod 30 is spaced apart from the cover plate 20, in which case, the gap space formed between the side of the dielectric piece 40 away from the resonant rod 30 and the cover plate 20 can provide the space for the tuning screw 50 to screw in, so as to facilitate the tuning screw 50 to screw into the cavity 10 relative to the cover plate 20 without obstruction, and thus the tuning is realized. As shown in Figure 11 , the present embodiment can also be applied to the case that the dielectric piece 40 is connected to the cover plate 20 and the side of the dielectric piece 40 away from the cover plate 20 is spaced apart from the resonant rod 30, in which case, the first through hole 43 for the tuning screw 50 to screw in can be formed on the dielectric piece 40, so as to facilitate the tuning screw 50 to screw into the cavity 10 relative to the cover plate 20 without obstruction, and thus the tuning is realized.

[0114] In addition, as shown in Figure 10 , in other possible embodiments, the opposite sides of the dielectric piece 40 can be respectively abutted against the cover plate 20 and the resonant rod 30, so that the dielectric piece 40 directly serves as the dielectric layer of the cover plate 20 and the resonant rod 30, and thus the effective dielectric constant between the resonant rod 30 and the cover plate 20 is increased, the plate capacitance between the resonant rod 30 and the cover plate 20 is enhanced, the resonant frequency is reduced, and the intermodulation stability and power index of the filter are improved. Meanwhile, the first through hole 43 for the tuning screw 50 to screw in can be formed on the dielectric piece 40, so as to facilitate the tuning screw 50 to screw into the cavity 10 relative to the cover plate 20 without obstruction, and thus the tuning is realized.

[0115] Embodiment Seven

[0116] The difference between the present embodiment and the embodiments one and six is that:

[0117] As shown in Figure 11 , Figure 12 , in the present embodiment, the cover plate 20 is a double-layer cover plate, which includes the tuning plate 22 corresponding to the resonant rod 30 and capable of being deformed by force, and the protection plate 23 connected to the tuning plate 22 and covering the cavity 10 together with the tuning plate 22. The protection plate 23 is provided with the second through hole 231 for exposing part of the tuning plate 22.

[0118] Based on the arrangement of the embodiment, the filter can be tuned to adjust the resonant frequency. Specifically, the fingers of the operator or an external tool can push the tuning plate 22 through the second through hole 231 of the protective plate 23 to deform the tuning plate 22 towards the side close to the resonant rod 30 to shorten the distance between the tuning plate 22 and the resonant rod 30; conversely, the fingers of the operator or an external tool can pull the tuning plate 22 through the second through hole 231 of the protective plate 23 to deform the tuning plate 22 towards the side away from the resonant rod 30 to lengthen the distance between the tuning plate 22 and the resonant rod 30; based on this, the distance between the tuning plate 22 and the resonant rod 30 can be adjusted to adjust the capacitance between the tuning plate 22 and the resonant rod 30, and then the resonant frequency can be adjusted, which is very convenient to adjust.

[0119] As shown in Figure 12 , the embodiment can be applied to the case where the medium piece 40 is connected to the resonant rod 30 and the side of the medium piece 40 away from the resonant rod 30 is spaced apart from the cover plate 20, in which case, the gap space formed between the side of the medium piece 40 away from the resonant rod 30 and the cover plate 20 can provide a deformation space for the deformation of the tuning plate 22 under stress towards the side close to the resonant rod 30, so as to facilitate the deformation and tuning of the tuning plate 22 without obstruction. As shown in Figure 12 , the embodiment can also be applied to the case where the medium piece 40 is connected to the cover plate 20 and the side of the medium piece 40 away from the cover plate 20 is spaced apart from the resonant rod 30, in which case, the gap space formed between the side of the medium piece 40 away from the cover plate 20 and the resonant rod 30 can provide a deformation space for the deformation of the tuning plate 22 under stress towards the side close to the resonant rod 30, so as to facilitate the deformation and tuning of the tuning plate 22 without obstruction.

[0120] Among them, the tuning plate 22 can be provided with an adjusting structure 70, which can be integrally connected or separately connected to the tuning plate 22. In this way, during the tuning process, the operator can use fingers or external tools to apply force to the adjusting structure 70 to drive the adjusting structure 70 to axially displace, drive the tuning plate 22 to deform, and further improve the convenience of adjusting the resonant frequency.

[0121] Compared with the first embodiment, the tuning plate 22 can be thinned to a greater extent on the basis of being protected by the protective plate 23 and ensuring the signal shielding effect of the tuning plate 22 and the protective plate 23 together, so that the deformation resistance of the tuning plate 22 is smaller and the deformable range is larger, thereby expanding the adjustment convenience and adjustable range of the cover plate 20; and since the protective plate 23 and the tuning plate 22 are a split forming structure, the protective plate 23 and the tuning plate 22 can be made of the same or different materials, thereby lightening the weight of the cover plate 20 and the filter to a certain extent.

[0122] Compared with the sixth embodiment, the tuning part 21 can not only achieve tuning, but also omit the tuning screw 50, based on which, on the one hand, the setting height of the cover plate 20 can be effectively thinned, thereby effectively expanding the designable height of the cavity 10 under the condition that the overall height of the filter is determined, and further ensuring and improving the intermodulation stability and power index of the filter; on the other hand, during the tuning process, the generation of impurities such as burrs and debris falling into the cavity 10 can be basically avoided, thereby effectively reducing the risk of short circuit phenomenon leading to failure of the filter, and further ensuring and improving the intermodulation stability and power index of the filter.

[0123] Eighth embodiment

[0124] Please refer to Figure 12 The application also provides a filter, which comprises a cavity 10, a cover plate 20, a resonant rod 30 and a dielectric piece 40. The cover plate 20 covers the cavity 10; the resonant rod 30 is arranged in the cavity 10, one end of the resonant rod 30 is connected with the cover plate 20, and the other end of the resonant rod 30 is arranged in a spaced manner with a resonant wall 12, which is an inner wall of the side of the cavity 10 opposite to the cover plate 20; the dielectric piece 40 is arranged between the resonant rod 30 and the resonant wall 12, and the dielectric constant of the dielectric piece 40 is greater than that of air.

[0125] It should be noted that the cavity 10 has a resonant cavity 11, and the cover plate 20 covers the cavity 10, especially the resonant cavity 11, to achieve a shielding function and prevent signal leakage. The resonant rod 30 is arranged in the resonant cavity 11, and one end of the resonant rod 30 is connected with the cover plate 20, wherein the resonant rod 30 can be connected with the cover plate 20 in a manner of welding, integral connection, riveting, pressure connection, screw fastening, threaded connection, clamping, etc., which is not limited in the present embodiment.

[0126] The resonant rod 30 can be a metal resonant rod 30, a ceramic medium resonant rod 30 or a medium resonant rod 30 made of other materials. The resonant rod 30 can be a circular rod, a polygonal rod, a special-shaped rod, a coil resonant rod, a sheet resonant rod, a sheet metal resonant rod or a resonant rod in other forms. The resonant rod 30 can be a hollow resonant rod 30 or a solid resonant rod 30. The resonant rod 30 can have a resonant disc or not. The resonant disc can have a turned-up edge or not. The present embodiment does not limit this.

[0127] The cavity 10 can be an integrally formed structure or a split connection structure. The present embodiment does not limit this.

[0128] In actual application scenarios, the filter can be placed with the cover plate 20 facing upwards, or placed with the cover plate 20 facing left, right, front or back. The present embodiment does not limit this.

[0129] It should be noted that the end of the resonant rod 30 away from the cover plate 20 is arranged opposite to and spaced apart from the inner wall of the cavity 10 away from the cover plate 20, and a plate capacitor is formed between the resonant rod 30 and the resonant wall 12.

[0130] The medium piece 40 is arranged between the resonant rod 30 and the resonant wall 12. The dielectric constant of the medium piece 40 is greater than that of air. Based on this, the effective dielectric constant between the resonant rod 30 and the resonant wall 12 can be increased by the medium piece 40, the plate capacitor between the resonant rod 30 and the resonant wall 12 can be enhanced, the resonant frequency can be reduced, and the intermodulation stability and power index of the filter can be effectively improved. The production pass rate of the filter can be correspondingly improved, the scrap rate and maintenance cost of the filter can be reduced, and the market competitiveness of the filter can be improved.

[0131] In summary, the filter provided by the present embodiment is arranged with the resonant rod 30 in the space enclosed by the cavity 10 and the cover plate 20. One end of the resonant rod 30 is connected to the cover plate 20, and the other end of the resonant rod 30 is arranged spaced apart from the resonant wall 12 of the cavity 10, so that a plate capacitor is formed between the resonant rod 30 and the resonant wall 12. On this basis, a medium piece 40 with a dielectric constant greater than that of air is additionally arranged between the resonant rod 30 and the resonant wall 12 to increase the effective dielectric constant between the resonant rod 30 and the resonant wall 12, thereby enhancing the plate capacitor between the resonant rod 30 and the resonant wall 12, reducing the resonant frequency, and effectively improving the intermodulation stability and power index of the filter. The production pass rate of the filter can be correspondingly improved, the scrap rate and maintenance cost of the filter can be reduced, and the market competitiveness of the filter can be improved.

[0132] Please refer to Figure 12 In the present embodiment, the medium piece 40 is connected to the resonant rod 30, and the side of the medium piece 40 away from the resonant rod 30 is arranged spaced apart from the resonant wall 12.

[0133] It should be noted that the side of the medium piece 40 close to the resonant rod 30 can be fixedly connected with the resonant rod 30 by means of, but not limited to, bonding, welding, riveting, and crimping, or can be detachably connected with the resonant rod 30 by means of, but not limited to, sleeving, clamping, and threaded connection, and the present embodiment does not limit this.

[0134] The side of the medium piece 40 away from the resonant rod 30 is spaced apart from the resonant wall 12, based on which, the medium piece 40 can be used as a first layer of medium between the resonant rod 30 and the resonant wall 12, and the air between the medium piece 40 and the resonant wall 12 can be used as a second layer of medium, so as to uniformly and controllably increase the effective dielectric constant between the resonant rod 30 and the resonant wall 12, uniformly and controllably enhance the plate capacitance between the resonant rod 30 and the resonant wall 12, uniformly and controllably reduce the resonant frequency, and uniformly and controllably improve the intermodulation stability and power index of the filter. Specifically, the effective dielectric constant between the resonant rod 30 and the resonant wall 12 can be changed by changing the thickness of the medium piece 40 between the resonant rod 30 and the resonant wall 12 and / or changing the dielectric constant of the medium piece 40. In addition, the side of the medium piece 40 away from the resonant rod 30 is spaced apart from the resonant wall 12 in the present application, which can avoid abutting the medium piece 40 between the resonant wall 12 and the resonant rod 30, does not need to set an additional elastic abutting piece, can reduce materials and cost, and is convenient to install. At the same time, the medium piece 40 is directly connected to the resonant rod 30, which also avoids the problem that when the medium piece 40 is abutted between the resonant wall 12 and the resonant rod 30, the medium piece 40 loosens or even falls off during the transportation or use of the filter, and thus the performance index of the filter is damaged, and can improve the installation stability of the medium piece 40, and thus increases the stability and reliability of the filter and reduces the failure probability of the filter.

[0135] Please refer to Figure 12 In the present embodiment, the medium piece 40 is point-glued to the resonant rod 30.

[0136] By using the above scheme, the medium piece 40 can be conveniently, reliably, and firmly fixedly connected to the resonant rod 30 by means of regional point-gluing, multi-point point-gluing, or continuous point-gluing, based on which, the installation stability of the medium piece 40 can be effectively improved, the risk of loosening or even falling off of the medium piece 40 during the transportation or use of the filter can be effectively reduced, and thus the stability and reliability of the filter can be effectively increased, and the failure probability of the filter can be effectively reduced.

[0137] Please refer to Figure 15In the embodiment, the dielectric piece 40 comprises a dielectric body 41 installed on the end surface of the resonant rod 30 close to the resonant wall 12, and a dielectric ring 42 connected to the periphery of the dielectric body 41 and extending towards the resonant rod 30 to form a dielectric piece 40 covering the end of the resonant rod 30 close to the resonant wall 12.

[0138] By using the above scheme, the dielectric piece 40 is in the form of a cap and covers the end of the resonant rod 30 close to the resonant wall 12, so that the dielectric piece 40 can be connected to the resonant rod 30 simply, quickly and accurately. Specifically, the dielectric ring 42 sleeved on the periphery of the resonant rod 30 can limit the dielectric piece 40 from moving circumferentially relative to the resonant rod 30, and accurately position the relative position and state of the dielectric piece 40 relative to the resonant rod 30; and the dielectric body 41 arranged on the side of the resonant rod 30 close to the cover plate 20 can reliably and effectively increase the effective dielectric constant between the resonant rod 30 and the resonant wall 12, enhance the plate capacitance between the resonant rod 30 and the resonant wall 12, reduce the resonant frequency, and improve the intermodulation stability and power index of the filter.

[0139] Please refer to Figure 13 In the embodiment, the cover plate 20 is a single-layer cover plate, and the cover plate 20 has a tuning part 21 arranged correspondingly to the resonant rod 30 and capable of being deformed under force.

[0140] Based on the arrangement of the embodiment, the filter can be tuned and the resonant frequency can be adjusted. Specifically, when a pushing force is applied to the tuning part 21, the tuning part 21 can be deformed towards the side close to the resonant rod 30 to shorten the distance between the resonant rod 30 and the resonant wall 12; conversely, when a pulling force is applied to the tuning part 21, the tuning part 21 can be deformed towards the side away from the resonant rod 30 to lengthen the distance between the resonant rod 30 and the resonant wall 12; based on this, the size of the capacitance between the resonant rod 30 and the resonant wall 12 can be adjusted by adjusting the distance between the resonant rod 30 and the resonant wall 12, and the resonant frequency can be adjusted, which is very convenient.

[0141] As shown in Figure 14 The embodiment can be applied to the scenario that the dielectric piece 40 is connected to the resonant rod 30 and the side of the dielectric piece 40 away from the resonant rod 30 is spaced apart from the resonant wall 12, and in this scenario, the gap space formed between the side of the dielectric piece 40 away from the resonant rod 30 and the resonant wall 12 can provide a deformation space for the tuning part 21 to deform towards the side close to the resonant rod 30, so as to facilitate the deformation and tuning of the tuning part 21 without obstruction. Figure 15As shown, the present embodiment can also be applicable to the scenario that the dielectric member 40 is connected to the resonant wall 12 and the side of the dielectric member 40 away from the resonant wall 12 is spaced apart from the resonant rod 30, in which case, the deformation space for the tuning part 21 to deform under force towards the side close to the resonant rod 30 can be provided by the gap space formed between the side of the dielectric member 40 away from the resonant wall 12 and the resonant rod 30, so as to facilitate the deformation and tuning of the tuning part 21 without obstruction.

[0142] In the present embodiment, the tuning part 21 can be provided with an adjusting structure 70, which can be integrally connected or separately connected to the tuning part 21. In this way, during the tuning process, the fingers of the operator or external tools can apply force to the adjusting structure 70 to drive the adjusting structure 70 to axially displace, thereby driving the tuning part 21 to deform, which can further improve the convenience of adjusting the resonant frequency.

[0143] Compared with Embodiment Thirteen, the present embodiment not only can achieve tuning through the tuning part 21, but also can omit the connecting screw rod 60. On the one hand, the setting height of the cover plate 20 can be effectively thinned, so that the designable height of the cavity 10 can be effectively enlarged under the condition that the overall height of the filter is determined, thereby further guaranteeing and improving the intermodulation stability and power index of the filter. On the other hand, during the tuning process, impurities such as burrs and debris can be basically avoided from falling into the cavity 10, thereby effectively reducing the risk of short circuit phenomenon leading to failure of the filter, and further guaranteeing and improving the intermodulation stability and power index of the filter.

[0144] Embodiment Nine

[0145] Please refer to Figure 15 In the present embodiment, the side of the dielectric body 41 close to the resonant rod 30 is provided with an opening 411, and the side of the resonant rod 30 close to the dielectric body 41 is provided with a protrusion 31, which is inserted into the opening 411.

[0146] By adopting the above scheme, the protrusion 31 of the resonant rod 30 and the opening 411 of the dielectric body 41 can be inserted and matched, so as to guarantee and improve the alignment accuracy between the resonant rod 30 and the dielectric body 41. Based on this, it is beneficial to accurately and evenly strengthen the effective dielectric constant and the plate capacitance between each side of the resonant rod 30 and the resonant wall 12 by the dielectric member 40. Further, by providing the protrusion 31, the distance between the outermost end of the resonant rod 30 away from the cover plate 20 and the resonant wall 12 can be relatively reduced, and the plate capacitance between the resonant rod 30 and the resonant wall 12 can be relatively enhanced, so as to further reduce the resonant frequency, and further improve the intermodulation stability and power index of the filter.

[0147] Optionally, the outer circumferential wall of the protrusion 31 of the resonant rod 30 can be provided with external threads, the hole wall of the opening 411 of the medium body 41 can be provided with internal threads, and the protrusion 31 of the resonant rod 30 is threadedly connected with the opening 411 of the medium body 41.

[0148] Embodiment Ten

[0149] The difference between this embodiment and Embodiment Nine is that:

[0150] Please refer to Figure 16 In this embodiment, the medium body 41 is provided with a protrusion 31 on the side close to the resonant rod 30, the resonant rod 30 is provided with an opening 411 on the side close to the medium body 41, and the protrusion 31 is inserted into the opening 411.

[0151] By using the above scheme, the positioning accuracy between the resonant rod 30 and the medium body 41 can be guaranteed and improved through the plug-in cooperation of the opening 411 of the resonant rod 30 and the protrusion 31 of the medium body 41, and based on this, it is beneficial to the strengthening effect of the precise and balanced medium 40 on the effective dielectric constant and the plate capacitance between each side of the resonant rod 30 and the resonant wall 12.

[0152] Optionally, the outer circumferential wall of the protrusion 31 of the medium body 41 can be provided with external threads, the hole wall of the opening 411 of the resonant rod 30 can be provided with internal threads, and the protrusion 31 of the medium body 41 is threadedly connected with the opening 411 of the resonant rod 30.

[0153] Embodiment Eleven

[0154] The difference between this embodiment and Embodiment Eight is that:

[0155] Please refer to Figure 16 In this embodiment, the medium 40 is connected to the resonant wall 12, and the side of the medium 40 away from the resonant wall 12 is arranged to be spaced apart from the resonant rod 30.

[0156] It should be noted that the side of the medium 40 close to the resonant wall 12 can be connected to the resonant wall 12 by means of, but not limited to, adhesion, welding, threaded connection, and pressure connection.

[0157] The side of the medium piece 40 away from the resonant wall 12 is arranged in a spaced manner with the resonant rod 30. Based on this, the air between the resonant rod 30 and the resonant wall 12, i.e. the air between the medium piece 40 and the resonant rod 30, can be taken as a first layer of medium layer, and the medium piece 40 can be taken as a second layer of medium layer, so as to uniformly and controllably increase the effective dielectric constant between the resonant rod 30 and the resonant wall 12, uniformly and controllably enhance the plate capacitor between the resonant rod 30 and the resonant wall 12, uniformly and controllably reduce the resonant frequency, and uniformly and controllably improve the intermodulation stability and power index of the filter. Specifically, the effective dielectric constant between the resonant rod 30 and the resonant wall 12 can be changed by changing the thickness of the medium piece 40 between the resonant rod 30 and the resonant wall 12 and / or changing the dielectric constant of the medium piece 40. In addition, the side of the medium piece 40 away from the resonant wall 12 is arranged in a spaced manner with the resonant rod 30 in the present application, so that the medium piece 40 can be prevented from being tightly arranged between the resonant wall 12 and the resonant rod 30, an additional elastic abutting piece does not need to be arranged, the material can be reduced, the cost can be reduced, and the installation is facilitated. At the same time, the medium piece 40 is directly connected to the resonant wall 12, so that the problem that the medium piece 40 is loosened or even falls off during the transportation or use of the filter, and then the performance index of the filter is damaged, can be avoided, the installation stability of the medium piece 40 can be improved, and then the stability and reliability of the filter can be increased, and the failure probability of the filter can be reduced.

[0158] Please refer to Figure 17 In the present embodiment, the medium piece 40 is connected to the resonant wall 12 by spot gluing.

[0159] By adopting the above scheme, the medium piece 40 can be conveniently, reliably and firmly fixed and connected to the resonant wall 12 in a regional spot gluing or multi-point spot gluing or continuous spot gluing manner, based on which the installation stability of the medium piece 40 can be effectively improved, the risk that the medium piece 40 is loosened or even falls off during the transportation or use of the filter can be effectively reduced, and then the stability and reliability of the filter can be effectively increased, and the failure probability of the filter can be effectively reduced.

[0160] Embodiment twelve

[0161] The difference between the present embodiment and the embodiments eight and eleven lies in that:

[0162] Please refer to Figure 18 In the present embodiment, the medium piece 40 includes a plurality of medium blocks 44 arranged in sequence along the axial direction between the resonant rod 30 and the resonant wall 12, and the dielectric constant of at least part of the medium blocks 44 is different.

[0163] By adopting the above scheme, the plurality of medium blocks 44 can form a plurality of medium layers between the resonant wall 12 and the resonant rod 30, and the dielectric constants of the plurality of medium blocks 44 are different. Based on this, the effective dielectric constant between the resonant rod 30 and the resonant wall 12 can be balanced and controllably increased, the plate capacitance between the resonant rod 30 and the resonant wall 12 can be balanced and controllably enhanced, the resonant frequency can be balanced and controllably reduced, and the intermodulation stability and power index of the filter can be balanced and controllably improved. Specifically, the thickness and / or the dielectric constant of the different medium blocks 44 can be changed to change the effective dielectric constant between the resonant rod 30 and the resonant wall 12.

[0164] Please refer to Figure 17 In the embodiment, one medium block 44 is connected to the resonant rod 30, and the other medium block 44 is connected to the resonant wall 12.

[0165] It should be noted that one of the medium blocks 44 can be fixedly connected to the resonant rod 30 by means of, but not limited to, bonding, welding, riveting, and crimping, or can be detachably connected to the resonant rod 30 by means of, but not limited to, sleeving, clamping, and threaded connection, and the embodiment does not limit this.

[0166] The other medium block 44 can be connected to the resonant wall 12 by means of, but not limited to, bonding, welding, threaded connection, and crimping, and the embodiment does not limit this.

[0167] By directly connecting one of the medium blocks 44 to the resonant rod 30 and directly connecting the other medium block 44 to the resonant wall 12, the installation stability of the resonant rod 30 and the resonant wall 12, respectively, can be stably and improved, thereby facilitating the improvement of the installation stability of the medium piece 40, the stability and reliability of the filter, and the reduction of the failure probability of the filter.

[0168] Embodiment Thirteen

[0169] The difference between the embodiment and the embodiment eight is that:

[0170] Please refer to Figure 18 , Figure 19 In the embodiment, the filter further includes a connecting screw 60 that is screwed to the cover plate 20 and connects the resonant rod 30 to the cover plate 20.

[0171] It should be noted that the resonant rod 30 is mounted on the cover plate 20 through the connecting screw 60, that is, one of the functions of the connecting screw 60 is to mount the resonant rod 30 to the cover plate 20.

[0172] The second function of the connecting screw 60 is to tune and adjust the resonant frequency. Specifically, when the connecting screw 60 is screwed in relative to the cover plate 20, the length of the portion of the connecting screw 60 that extends into the cavity 10 is increased, which causes the resonant rod 30 to move towards the resonant wall 12, and the distance between the resonant rod 30 and the resonant wall 12 is reduced. Conversely, when the connecting screw 60 is screwed out relative to the cover plate 20, the length of the portion of the connecting screw 60 that extends into the cavity 10 is reduced, which causes the resonant rod 30 to move away from the resonant wall 12, and the distance between the resonant rod 30 and the resonant wall 12 is increased. Therefore, the distance between the resonant rod 30 and the resonant wall 12 can be adjusted by adjusting the length of the portion of the connecting screw 60 that extends into the cavity 10, and the resonant frequency can be adjusted accordingly, which is very convenient.

[0173] Moreover, since the connecting screw 60 can be used to both mount the resonant rod 30 to the cover plate 20 and adjust the resonant frequency, the structure and assembly process of the filter provided by the present embodiment can be significantly simplified, and the tuning and use performance of the filter are not affected.

[0174] As shown in Figure 20 , the present embodiment can be applied to the scenario where the medium member 40 is connected to the resonant rod 30 and the side of the medium member 40 that is away from the resonant rod 30 is spaced apart from the resonant wall 12. In this scenario, the gap space formed between the side of the medium member 40 that is away from the resonant rod 30 and the resonant wall 12 can provide the space for the connecting screw 60 to be screwed in, i.e., the space for the resonant rod 30 to move towards the resonant wall 12, so that the connecting screw 60 can be screwed into the cavity 10 relative to the resonant wall 12 without obstruction, and the resonant rod 30 can be moved towards the resonant wall 12 to achieve tuning. Figure 19 As shown in , the present embodiment can be applied to the scenario where the medium member 40 is connected to the resonant wall 12 and the side of the medium member 40 that is away from the resonant wall 12 is spaced apart from the resonant rod 30. In this scenario, the gap space formed between the side of the medium member 40 that is away from the resonant wall 12 and the resonant rod 30 can provide the space for the connecting screw 60 to be screwed in, i.e., the space for the resonant rod 30 to move towards the resonant wall 12, so that the connecting screw 60 can be screwed into the cavity 10 relative to the resonant wall 12 without obstruction, and the resonant rod 30 can be moved towards the resonant wall 12 to achieve tuning.

[0175] Embodiment Fourteen

[0176] The difference between the present embodiment and Embodiments Eight and Thirteen is that:

[0177] Please refer to Figure 20 , ​In the embodiment, the cover plate 20 is a double-layer cover plate, which comprises a tuning plate 22 corresponding to the resonant rod 30 and capable of being deformed by force, and a protective plate 23 connected to the tuning plate 22 and covering the cavity 10 together with the tuning plate 22. The protective plate 23 is provided with a second through hole 231 for exposing a part of the tuning plate 22.

[0178] Based on the arrangement of the embodiment, the filter can be tuned to adjust the resonant frequency. Specifically, the fingers of the operator or an external tool can pass through the second through hole 231 of the protective plate 23 to apply a pushing force to the tuning plate 22, so as to deform the tuning plate 22 towards the side close to the resonant rod 30, thereby narrowing the distance between the resonant rod 30 and the resonant wall 12. Conversely, the fingers of the operator or an external tool can pass through the second through hole 231 of the protective plate 23 to apply a pulling force to the tuning plate 22, so as to deform the tuning plate 22 towards the side away from the resonant rod 30, thereby widening the distance between the resonant rod 30 and the resonant wall 12. Based on this, the distance between the resonant rod 30 and the resonant wall 12 can be adjusted, the capacitance between the resonant rod 30 and the resonant wall 12 can be adjusted, and the resonant frequency can be adjusted on the basis of covering the cavity 10 together by the protective plate 23 and the tuning plate 22 to achieve the shielding function together and on the basis of protecting the tuning plate 22 by the protective plate 23. The adjustment is very convenient.

[0179] As shown in FIG. 6, the embodiment can be applied to the case where the medium piece 40 is connected to the resonant wall 12 and the side of the medium piece 40 away from the resonant wall 12 is spaced apart from the resonant rod 30. In this case, the gap space formed between the side of the medium piece 40 away from the resonant wall 12 and the resonant rod 30 can provide a deformation space for the tuning plate 22 to deform by force towards the side close to the resonant rod 30, so as to facilitate the deformation and tuning of the tuning plate 22 without obstruction. ​ As shown in FIG. 6, the embodiment can be applied to the case where the medium piece 40 is connected to the resonant wall 12 and the side of the medium piece 40 away from the resonant wall 12 is spaced apart from the resonant rod 30. In this case, the gap space formed between the side of the medium piece 40 away from the resonant wall 12 and the resonant rod 30 can provide a deformation space for the tuning plate 22 to deform by force towards the side close to the resonant rod 30, so as to facilitate the deformation and tuning of the tuning plate 22 without obstruction. ​ In the embodiment, the cover plate 20 is a double-layer cover plate, which comprises a tuning plate 22 corresponding to the resonant rod 30 and capable of being deformed by force, and a protective plate 23 connected to the tuning plate 22 and covering the cavity 10 together with the tuning plate 22. The protective plate 23 is provided with a second through hole 231 for exposing a part of the tuning plate 22.

[0180]

[0181] ​Compared with the eighth embodiment, the present embodiment can thin the tuning plate 22 to a greater extent on the basis of protecting the tuning plate 22 by the protection plate 23 and ensuring the signal shielding effect of the tuning plate 22 and the protection plate 23 together, so that the deformation resistance of the tuning plate 22 is smaller and the deformable range is larger, thereby expanding the adjustment convenience and adjustable range of the cover plate 20; and since the protection plate 23 and the tuning plate 22 are a split forming structure, the protection plate 23 and the tuning plate 22 can be made of the same or different materials, thereby lightening the weight of the cover plate 20 and the filter to a certain extent.

[0182] Compared with the thirteenth embodiment, the present embodiment not only can realize tuning through the tuning plate 22, but also can omit the connecting screw 60, based on which, on the one hand, the setting height of the cover plate 20 can be effectively thinned, thereby effectively expanding the designable height of the cavity 10 under the condition that the overall height of the filter is determined, and thereby further ensuring and improving the intermodulation stability and power index of the filter; on the other hand, impurities such as burrs and debris can be basically avoided from falling into the cavity 10 during the tuning process, thereby effectively reducing the risk of short circuit phenomenon leading to failure of the filter, and further ensuring and improving the intermodulation stability and power index of the filter.

[0183] The above only describes the preferred embodiments of the present application and is not intended to limit the present application. Any modification, equivalent replacement or improvement made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A filter, characterized by, The filter comprises: a cavity; a cover plate covering the cavity; a resonant rod arranged in the cavity, one end of the resonant rod being connected with the cover plate, and the other end of the resonant rod being arranged in a spaced manner with a resonant wall which is an inner wall of a side of the cavity opposite to the cover plate; a dielectric member arranged between the resonant rod and the resonant wall, the dielectric member having a dielectric constant greater than that of air, the dielectric member being connected with the resonant rod, and a side of the dielectric member away from the resonant rod being arranged in a spaced manner with the resonant wall, the dielectric member comprising a dielectric body mounted on an end surface of the resonant rod close to the resonant wall, the dielectric body comprising a plurality of dielectric blocks arranged in a sequential manner along an axial direction between the resonant rod and the resonant wall, and at least part of the dielectric blocks having different dielectric constants; a hole is arranged on a side of the dielectric body close to the resonant rod, a protrusion is arranged on a side of the resonant rod close to the dielectric body, and the protrusion is inserted into the hole; or, a protrusion is arranged on a side of the dielectric body close to the resonant rod, a hole is arranged on a side of the resonant rod close to the dielectric body, and the protrusion is inserted into the hole.

2. The filter of claim 1, wherein, The dielectric member is connected with the resonant rod by dispensing.

3. The filter of claim 1, wherein, The dielectric member comprises a dielectric ring connected with a peripheral edge of the dielectric body and extending towards the resonant rod, and the dielectric member is arranged on an end of the resonant rod close to the resonant wall.

4. The filter of any one of claims 1-3, wherein, The cover plate has a tuning portion arranged in a corresponding manner with the resonant rod and capable of being deformed under force; or, the filter further comprises a tuning screw threadedly connected with the cover plate and arranged in a corresponding manner with the resonant rod; or, the cover plate comprises a tuning plate arranged in a corresponding manner with the resonant rod and capable of being deformed under force, and a protection plate connected with the tuning plate and covering the cavity together with the tuning plate.

5. A filter, characterized by The filter comprises: a cavity; a cover plate covering the cavity; a resonant rod arranged in the cavity, one end of the resonant rod being connected with the cover plate, and the other end of the resonant rod being arranged in a spaced manner with a resonant wall which is an inner wall of a side of the cavity opposite to the cover plate; a dielectric member arranged between the resonant rod and the resonant wall, the dielectric member having a dielectric constant greater than that of air, the dielectric member being connected with the resonant rod, and a side of the dielectric member away from the resonant rod being arranged in a spaced manner with the resonant wall, the dielectric member comprising a dielectric body mounted on an end surface of the resonant rod close to the resonant wall, the dielectric body comprising a plurality of dielectric blocks arranged in a sequential manner along an axial direction between the resonant rod and the resonant wall, and at least part of the dielectric blocks having different dielectric constants; a hole is arranged on a side of the dielectric body close to the resonant rod, a protrusion is arranged on a side of the resonant rod close to the dielectric body, and the protrusion is inserted into the hole; or, a protrusion is arranged on a side of the dielectric body close to the resonant rod, a hole is arranged on a side of the resonant rod close to the dielectric body, and the protrusion is inserted into the hole.

6. The filter of claim 5, wherein, The dielectric member is connected with the resonant rod by dispensing.

7. The filter of claim 5, wherein, The dielectric member comprises a dielectric ring connected with a peripheral edge of the dielectric body and extending towards the resonant rod, and the dielectric member is arranged on an end of the resonant rod close to the resonant wall.

8. The filter of any one of claims 5-7, wherein, The cover plate has a tuning portion arranged in a corresponding manner with the resonant rod and capable of being deformed under force; Or, the filter further comprises a connecting screw threadedly connected to the cover plate and connecting the resonant rod to the cover plate. Or, the cover plate comprises a tuning plate correspondingly arranged with the resonant rod and capable of being deformed by force, and a protection plate connected to the tuning plate and jointly covering the cavity with the tuning plate.

Images