Filter and communication equipment

Abstract

The utility model provides a filter and communication equipment, the filter comprises a cavity, a cover body, a dielectric resonance part and a limiting part, the cover body covers the cavity and forms a resonant cavity with the cavity in an enclosing manner, the dielectric resonance part is accommodated in the resonant cavity, the dielectric resonance part is provided with a first end face and a second end face which are oppositely arranged, the first end face abuts against the cover body, and the second end face abuts against the limiting part. The second end face abuts against the cavity and is provided with a first limiting groove in a concave mode, one end of the limiting piece is connected to the cavity, the other end of the limiting piece is inserted into the first limiting groove, and the peripheral wall of the limiting piece is in clearance fit with the groove wall of the first limiting groove. According to the filter provided by the invention, the peripheral wall of the limiting piece is in clearance fit with the groove wall of the first limiting groove, so that the expansion buffer space is formed between the peripheral wall of the limiting piece and the groove wall of the first limiting groove, thereby effectively improving the condition that the limiting piece extrudes the dielectric resonance piece, further effectively improving the temperature drift stability of the dielectric resonance piece, and improving the reliability of the filter. And the performance of the filter is effectively improved.

Description

Technical Field

[0001] The present application relates to the field of communication technology, and in particular to a filter and a communication device. Background Art

[0002] As a frequency selection device, filters are widely used in the communication field, especially in the field of radio frequency communication. In base stations, filters are used to filter out clutter or interference signals outside the communication signal frequency.

[0003] The filter may generally include a cavity, a dielectric resonator and a cover. The cover is disposed on the cavity and encloses the cavity to form a resonant cavity. The dielectric resonator is accommodated in the resonant cavity and abuts between the cover and the cavity. A limiting structure is generally provided between the dielectric resonator and the cavity. The limiting structure is inserted into the resonant hole of the dielectric resonator and has an interference fit with the hole wall of the resonant hole to limit the relative position of the dielectric resonator and the cavity. However, since the limiting structure is prone to expansion in a high temperature environment, the expanded limiting structure will squeeze the hole wall of the resonant hole, making the temperature drift stability of the dielectric resonator worse, which is not conducive to improving the performance of the filter. Utility Model Content

[0004] One of the purposes of the embodiments of the present application is to provide a filter and a communication device, aiming to solve the technical problem in the related art that the performance of the filter is deteriorated due to the poor temperature drift stability of the dielectric resonator.

[0005] In order to solve the above technical problems, the technical solution adopted in the embodiment of the present application is: a filter is provided, comprising:

[0006] Cavity;

[0007] A cover body, which is disposed on the cavity and encloses the cavity to form a resonant cavity;

[0008] A dielectric resonator is accommodated in the resonant cavity, the dielectric resonator has a first end surface and a second end surface which are arranged opposite to each other, the first end surface abuts against the cover body, the second end surface abuts against the cavity body and is concavely provided with a first limiting groove;

[0009] One end of the limiting member is connected to the cavity, and the other end of the limiting member is inserted into the first limiting groove. The outer peripheral wall of the limiting member is gap-matched with the groove wall of the first limiting groove.

[0010] The beneficial effect of the filter provided by the embodiment of the present application is that: a first limit groove is provided on the second end face of the dielectric resonator in the filter provided by the embodiment of the present application, and the limit member is inserted into the first limit groove. By matching the clearance between the outer peripheral wall of the limit member and the groove wall of the first limit groove, an expansion buffer space is formed between the outer peripheral wall of the limit member and the groove wall of the first limit groove. The expansion buffer space can absorb the expansion of the limit member, thereby effectively improving the situation where the limit member squeezes the dielectric resonator, thereby effectively improving the temperature drift stability of the dielectric resonator, and effectively improving the performance of the filter.

[0011] In some embodiments of the present application, the filter further includes a buffer member, at least a portion of which is disposed between an outer peripheral wall of the limiting member and a groove wall of the first limiting groove.

[0012] In some embodiments of the present application, the limiting member is bonded to the groove wall of the first limiting groove via a buffer member.

[0013] In some embodiments of the present application, the width of the gap between the outer peripheral wall of the limiting member and the groove wall of the first limiting groove is less than or equal to 0.1 mm.

[0014] In some embodiments of the present application, the second end surface includes a limiting area and an abutting area, the first limiting groove is recessed in the limiting area, and the abutting area is annularly arranged in the limiting area and is used to abut the cavity.

[0015] In some embodiments of the present application, a second limiting groove is recessed on the inner wall surface of the cavity facing the second end surface, and the limiting member is inserted into the second limiting groove.

[0016] In some embodiments of the present application, the expansion coefficient of the stopper is 8×10 -6 m / K-10×10 -6 m / K.

[0017] In some embodiments of the present application, the limiting member is an alumina ceramic member; or, the limiting member and the dielectric resonator member are both microwave dielectric ceramic members.

[0018] In some embodiments of the present application, the filter also includes a tuning component, which is mounted on the cover body and can move back and forth along the thickness direction of the cover body so that at least a portion of the tuning component is inserted into the resonance cavity; the dielectric resonator is provided with a first resonance hole passing through the first end face and the second end face, at least a portion of the tuning component is inserted into the first resonance hole, the cavity is provided with a second resonance hole, and the limiting component is provided with a through hole for the tuning component to pass through, and the through hole is used to connect the first resonance hole and the second resonance hole.

[0019] In some embodiments of the present application, the cavity includes a main body and a support seat, the cover body is covered on the main body and encloses the main body to form a resonance cavity, and the support seat is connected to the inner wall surface of the main body and abuts against at least part of the second end surface.

[0020] In some embodiments of the present application, the cover body includes a connecting portion connected to the cavity and a deformable portion for abutting the first end face, the connecting portion is provided with a third limiting groove, the filter also includes an elastic member, the elastic member includes a fixed portion and an elastic portion, the fixed portion is inserted into the third limiting groove to limit the fixed portion from moving in a direction away from the resonant cavity along the thickness direction of the cover body, and the elastic portion is pressed against the side of the deformable portion facing away from the first end face.

[0021] An embodiment of the present application further provides a communication device, comprising the filter described in any one of the above embodiments.

[0022] The beneficial effect of the communication device provided by the embodiments of the present application is that the communication device provided by the embodiments of the present application effectively improves the performance of the communication device due to the use of the filter described in any of the above embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the embodiments or exemplary technical descriptions will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0024] Figure 1 A schematic diagram of a top view of the filter provided in an embodiment of the present application;

[0025] Figure 2 for Figure 1 The cross-sectional structure diagram of the filter shown is along the AA line direction;

[0026] Figure 3 for Figure 2 The enlarged structural diagram of the filter at position B is shown;

[0027] Figure 4 for Figure 2 The enlarged structural diagram of the filter at position C is shown;

[0028] Figure 5 for Figure 2 A bottom-up structural schematic diagram of a dielectric resonator in the filter is shown.

[0029] Description of reference numerals:

[0030] 100, filter;

[0031] 10. Cavity; 11. Main body; 12. Support seat; 13. Second limiting groove; 14. Second resonance hole;

[0032] 20. cover body; 21. connecting portion; 211. third limiting groove; 22. deformation portion; 221. cover plate; 222. boss;

[0033] 30. Resonant cavity;

[0034] 40. dielectric resonator; 41. first end surface; 42. second end surface; 421. limiting area; 422. abutting area; 43. first limiting groove; 44. first resonant hole;

[0035] 50. a stopper; 51. a through hole;

[0036] 60. Buffer parts;

[0037] 70. Tuning parts;

[0038] 80. elastic member; 81. fixing portion; 82. elastic portion;

[0039] 90. Connector. DETAILED DESCRIPTION

[0040] In order to make the purpose, technical solution and advantages of the present application more clearly understood, the present application is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0041] It should be noted that when a component is referred to as being "fixed on" or "disposed on" another component, it may be directly on the other component or indirectly on the other component. When a component is referred to as being "connected to" another component, it may be directly or indirectly connected to the other component. The orientation or positional relationship indicated by the terms "upper", "lower", "left", "right", etc. is based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application. For ordinary technicians in this field, the specific meanings of the above terms can be understood according to the specific circumstances. The terms "first" and "second" are only used for the purpose of convenience of description, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features. The meaning of "multiple" is two or more, unless otherwise clearly and specifically defined.

[0042] In the embodiments of the present application, the same reference numerals represent the same components, and for the sake of brevity, detailed descriptions of the same components are omitted in different embodiments. It should be understood that the thickness, length, width and other dimensions of the various components in the embodiments of the present application shown in the drawings are only exemplary and should not constitute any limitation to the present application.

[0043] Filters are mainly used in communication equipment to filter out clutter or interference signals outside the communication signal frequency. The filter may include a cavity, a cover, and a dielectric resonator. The cover is disposed on the cavity and encloses the cavity to form a resonant cavity. The dielectric resonator is accommodated in the resonant cavity and abuts between the cover and the cavity.

[0044] The performance of the filter is greatly affected by the contact between the dielectric resonator and the cover or cavity. In the case of poor contact between the dielectric resonator and the cover or cavity, the performance of the filter will deteriorate. In order to ensure that the dielectric resonator can fully contact with the cover or cavity, it is necessary to limit the relative position of the dielectric resonator and the cover or cavity so that the dielectric resonator can be effectively fixed in the resonant cavity.

[0045] In the related art, a stopper is usually provided at the abutment between the dielectric resonator and the cavity. Specifically, one end of the stopper is inserted into the resonance hole of the dielectric resonator and has an interference fit with the hole wall of the resonance hole, and the other end of the stopper is inserted into the limit groove of the cavity to limit the relative position of the dielectric resonator and the cavity. However, in actual application, the temperature of the environment in which the filter is located is usually high, and the stopper is prone to expansion in a high temperature environment. The expanded stopper will squeeze the hole wall of the resonance hole, which is likely to cause the temperature drift stability of the dielectric resonator to deteriorate, which is not conducive to improving the performance of the filter.

[0046] In order to improve the temperature drift stability of the dielectric resonator, a first limit groove is provided on the second end face of the dielectric resonator in the filter provided in the embodiment of the present application, and the limit member is inserted into the first limit groove. By matching the clearance between the outer peripheral wall of the limit member and the groove wall of the first limit groove, an expansion buffer space is formed between the outer peripheral wall of the limit member and the groove wall of the first limit groove. The expansion buffer space can absorb the expansion of the limit member, thereby effectively improving the situation where the limit member squeezes the dielectric resonator, thereby effectively improving the temperature drift stability of the dielectric resonator, and effectively improving the performance of the filter.

[0047] First, see Figures 1 to 5 The embodiment of the present application provides a filter 100, comprising a cavity 10, a cover 20, a dielectric resonator 40 and a stopper 50. The cover 20 is covered on the cavity 10 and encloses the cavity 10 to form a resonant cavity 30. The dielectric resonator 40 is accommodated in the resonant cavity 30, and the dielectric resonator 40 has a first end face 41 and a second end face 42 arranged opposite to each other, the first end face 41 abuts against the cover 20, and the second end face 42 abuts against the cavity 10 and is concavely provided with a first stopper 43. One end of the stopper 50 is connected to the cavity 10, and the other end of the stopper 50 is inserted into the first stopper 43, and the outer peripheral wall of the stopper 50 is gap-matched with the groove wall of the first stopper 43.

[0048] It should be noted that the filter 100 has a height direction, a length direction and a width direction. Figure 2 In some embodiments, the height direction of the filter 100 may be the covering direction of the cover 20 and the cavity 10. The width direction of the filter 100 may refer to Figure 1 The Y direction shown, the length direction of the filter 100 can be referred to Figure 1 and Figure 2 The X direction shown. The size of the filter 100 along the width direction may be the same as or different from the size of the filter 100 along the length direction. The cavity 10 and the cover 20 together define the shape of the filter 100. The height direction of the filter 100 is the height direction of the cavity 10 and the thickness direction of the cover 20, which is also the length direction of the dielectric resonator 40. The length direction of the filter 100 is the length direction of the cavity 10 and the length direction of the cover 20. The width direction of the filter 100 is the width direction of the cavity 10 and the width direction of the cover 20.

[0049] The cavity 10 refers to a solid component with a certain accommodation space inside, and the cavity 10 is used to define the internal environment of the filter 100. An opening can be set on the cavity 10, and the internal environment of the cavity 10 can be connected to the external environment of the cavity 10 through the opening. The cover 20 is covered on the opening to close the internal environment of the cavity 10, thereby forming a resonant cavity 30 of the filter 100. The cavity 10 can be made of metal material, and the metal material can be but not limited to aluminum, copper, etc. The shape of the cavity 10 can be cylindrical, cube, cuboid, etc.

[0050] The cover 20 is a component for sealing the internal environment of the cavity 10. At least the portion of the cover 20 facing the resonant cavity 30 is made of metal material to achieve a signal shielding function. In some embodiments, the cover 20 is made entirely of metal material. In other embodiments, the cover 20 includes a plurality of layer structures stacked in sequence, and the layer structure facing the resonant cavity 30 is made of metal material. The metal material may be, but is not limited to, aluminum, copper, etc. The shape of the cover 20 may be adapted to the shape of the cavity 10 to match the cavity 10. The cover 20 may be fixedly connected to the cavity 10. In some embodiments, the filter 100 further includes a fastener, a first connection hole is provided on the cover 20, and the first connection hole penetrates the cover 20 along the thickness direction of the cover 20, and a second connection hole is provided on the cavity 10, and the fastener is passed through the first connection hole and locked in the second connection hole. For example, the fastener may be threadedly connected in the second connection hole to achieve a fixed connection between the cover 20 and the cavity 10. Of course, in other embodiments, the connection method between the cover body 20 and the cavity body 10 may also be but is not limited to welding, bonding, etc.

[0051] The dielectric resonator 40 refers to a resonant structure containing a dielectric material. In some embodiments, a portion of the dielectric resonator 40 is made of a dielectric material, for example, the dielectric resonator 40 is a metal resonator loaded with a dielectric, a sheet metal resonator loaded with a dielectric, etc. In other embodiments, the dielectric resonator 40 is made entirely of a dielectric material. Among them, the above-mentioned dielectric material can be a dielectric material having a relative dielectric constant greater than the dielectric constant of air, and the dielectric material can be but is not limited to microwave ceramics, magnesium oxide, titanium dioxide, zinc oxide, aluminum oxide, calcium carbonate, silicon dioxide, samarium trioxide, aluminum trioxide, and strontium carbonate, etc. In the height direction of the filter 100, the surface of the dielectric resonator 40 facing the cover 20 is the first end face 41 of the dielectric resonator 40, and the surface of the dielectric resonator 40 facing the bottom of the cavity 10 is the second end face 42 of the dielectric resonator 40. The first end face 41 can be completely abutted against the cover 20, or it can be partially abutted against the cover 20. Part of the second end surface 42 is recessed in a direction away from the bottom of the cavity 10 to form the first limiting groove 43. The first limiting groove 43 can be provided in any area of ​​the second end surface 42. In some embodiments, the first limiting groove 43 is provided in the middle area of ​​the second end surface 42. In some embodiments, the dielectric resonator 40 is provided with a resonance hole. In the length direction of the dielectric resonator 40, the resonance hole passes through the first end surface 41. The resonance hole may pass through the second end surface 42 or may not pass through the second end surface 42.

[0052] The stopper 50 is a component used to limit the relative position of the dielectric resonator 40 and the cavity 10. Specifically, in the height direction of the filter 100, one end of the stopper 50 is connected to the cavity 10, and the other end of the stopper 50 is inserted into the first stopper groove 43 to limit the relative position of the dielectric resonator 40 and the cavity 10 along any direction perpendicular to the length direction of the dielectric resonator 40. In some embodiments, the outer contour shape of the stopper 50 is adapted to the inner contour shape of the first stopper groove 43. For example, the outer contour shape of the stopper 50 and the inner contour shape of the first stopper groove 43 are both circular. The clearance fit between the outer wall of the stopper 50 and the groove wall of the first stopper groove 43 means that a gap is formed between the outer wall of the stopper 50 and the groove wall of the first stopper groove 43. The material of the stopper 50 can be, but is not limited to, plastic, ceramic, metal, etc.

[0053] A first limiting groove 43 is provided on the second end surface 42 of the dielectric resonator 40 in the filter 100 provided in the embodiment of the present application, and the limiting member 50 is inserted into the first limiting groove 43. By matching the outer peripheral wall of the limiting member 50 with the groove wall of the first limiting groove 43, an expansion buffer space is formed between the outer peripheral wall of the limiting member 50 and the groove wall of the first limiting groove 43. The expansion buffer space can absorb the expansion of the limiting member 50, thereby effectively improving the situation where the limiting member 50 squeezes the dielectric resonator 40, thereby effectively improving the temperature drift stability of the dielectric resonator 40, and effectively improving the performance of the filter 100.

[0054] In some embodiments of this application, please refer to Figure 3 The filter 100 further includes a buffer member 60 , at least a portion of which is disposed between the outer peripheral wall of the limiting member 50 and the groove wall of the first limiting groove 43 .

[0055] The buffer 60 is a component for absorbing the expansion force of the limiter 50. It can be understood that the buffer 60 is made of a flexible material, and the flexible material can be but is not limited to rubber, silicone, etc. At least part of the buffer 60 is disposed between the outer peripheral wall of the limiter 50 and the groove wall of the first limit groove 43, which means that at least part of the buffer 60 is disposed in the above-mentioned gap. In some embodiments, the buffer 60 can be entirely disposed between the outer peripheral wall of the limiter 50 and the groove wall of the first limit groove 43, for example, the buffer 60 is annular and sleeved on the outer peripheral wall of the limiter 50. In other embodiments, a part of the buffer 60 is disposed between the outer peripheral wall of the limiter 50 and the groove wall of the first limit groove 43, and another part of the buffer 60 is disposed between the end surface of the limiter 50 facing the dielectric resonator 40 and the groove bottom of the first limit groove 43. In some other embodiments, the buffer 60 can cover the entire outer surface of the limiter 50.

[0056] By adopting the above technical solution, when the stopper 50 expands, the stopper 50 squeezes the buffer 60, causing the buffer 60 to be compressed and deformed to absorb the expansion force of the stopper 50, thereby effectively improving the situation where the stopper 50 squeezes the dielectric resonator 40, thereby effectively improving the temperature drift stability of the dielectric resonator 40, and effectively improving the performance of the filter 100. In addition, by arranging the buffer 60 between the outer peripheral wall of the stopper 50 and the groove wall of the first stopper groove 43, the stopper 50, the buffer 60 and the dielectric resonator 40 can be relatively fixed, so that the relative position of the dielectric resonator 40 and the cavity 10 can be better limited.

[0057] In some embodiments of the present application, the limiting member 50 is bonded to the groove wall of the first limiting groove 43 via the buffer member 60 .

[0058] It can be understood that the buffer member 60 is made of a viscous flexible material, and the viscous flexible material may be, but is not limited to, polyurethane, silicone rubber, butyl rubber, thermoplastic elastomer, natural rubber, synthetic rubber, and the like.

[0059] By adopting the above technical solution, the limiting member 50 and the dielectric resonator 40 can be fixedly connected via the buffer member 60 , so that the relative position of the dielectric resonator 40 and the cavity 10 can be better limited.

[0060] In other embodiments, the buffer member 60 may not be provided between the outer peripheral wall of the limiting member 50 and the groove wall of the first limiting groove 43. On the premise that there is a gap between the outer peripheral wall of the limiting member 50 and the groove wall of the first limiting groove 43, the end surface of the limiting member 50 facing the dielectric resonator 40 and the groove bottom of the first limiting groove 43 may be fixed by bonding. In this embodiment, the bonding material may be a viscous flexible material, or may be a glue or adhesive that is not flexible (i.e., has no buffering effect).

[0061] In some embodiments of this application, please refer to Figure 3 The width W of the gap between the outer peripheral wall of the limiting member 50 and the groove wall of the first limiting groove 43 is less than or equal to 0.1 mm.

[0062] The width W of the gap between the outer wall of the limiting member 50 and the groove wall of the first limiting groove 43 can be determined according to actual application requirements. For example, the width W of the gap between the outer wall of the limiting member 50 and the groove wall of the first limiting groove 43 can be set according to the expansion coefficient of the limiting member 50 itself. The width W of the gap between the outer wall of the limiting member 50 and the groove wall of the first limiting groove 43 can specifically be 0.01mm, 0.02mm, 0.03mm, 0.04mm, 0.05mm, 0.06mm, 0.07mm, 0.08mm, 0.09mm, 0.1mm, etc.

[0063] By adopting the above technical solution, it is possible to avoid excessive relative displacement between the limiter 50 and the dielectric resonator 40 in a direction perpendicular to the length direction of the dielectric resonator 40 , thereby ensuring that the limiter 50 can effectively limit the relative position of the dielectric resonator 40 and the cavity 10 .

[0064] In some embodiments of this application, please refer to Figure 5 The second end surface 42 includes a limiting area 421 and a contact area 422 . The first limiting groove 43 is recessed in the limiting area 421 . The contact area 422 is annularly arranged in the limiting area 421 and is used to contact the cavity 10 .

[0065] In other words, in this embodiment, the limiting area 421 is the middle area of ​​the second end surface 42 , that is, the first limiting groove 43 is recessed in the middle area of ​​the second end surface 42 , and the abutting area 422 is the outer peripheral area of ​​the second end surface 42 .

[0066] In some embodiments, the limiting member 50 is in a cylindrical structure, the second end surface 42 and the limiting area 421 are both circular, and the central axis of the second end surface 42 coincides with the central axis of the limiting area 421 .

[0067] By using the middle area of ​​the second end surface 42 to cooperate with the limiting member 50 , the position of the dielectric resonator 40 can be limited more accurately, further improving the performance of the filter 100 .

[0068] In some embodiments of this application, please refer to Figure 3 A second limiting groove 13 is concavely formed on the inner wall surface of the cavity 10 facing the second end surface 42 , and the limiting member 50 is inserted into the second limiting groove 13 .

[0069] The second limiting groove 13 is formed on the inner wall of the cavity 10 facing the second end surface 42 , which means that the inner wall of the cavity 10 facing the second end surface 42 is recessed in a direction away from the dielectric resonator 40 to form the second limiting groove 13 .

[0070] The limiting member 50 is inserted into the second limiting groove 13 , which means that at least a portion of the limiting member 50 is disposed in the second limiting groove 13 .

[0071] In some embodiments, in order to facilitate the insertion of the limit member 50 into the second limit groove 13, the outer wall of the limit member 50 is gap-matched with the groove wall of the second limit groove 13, that is, a gap is formed between the outer wall of the limit member 50 and the groove wall of the second limit groove 13.

[0072] Of course, in other embodiments, the outer peripheral wall of the limiting member 50 may also be interference fit with the groove wall of the second limiting groove 13 .

[0073] By adopting the above technical solution, it is convenient to connect the stopper 50 with the cavity 10 , thereby effectively improving the assembly efficiency of the filter 100 .

[0074] In some embodiments of the present application, the expansion coefficient of the stopper 50 is 8×10 -6 m / K-10×10 -6 m / K.

[0075] It is understandable that the stopper 50 can be made of a material with an expansion coefficient of 8×10 -6 m / K-10×10 -6The expansion coefficient of the stopper 50 can be determined according to the actual application requirements, as long as it meets the above range. The expansion coefficient of the stopper 50 can be specifically 8×10 -6 m / K, 8.5×10 -6 m / K、9×10 -6 m / K、9.5×10 -6 m / K, 10×10 -6 m / K, etc.

[0076] By adopting the above technical solution, the expansion amount of the limiter 50 can be effectively limited, thereby further improving the situation where the limiter 50 squeezes the dielectric resonator 40, further improving the temperature drift stability of the dielectric resonator 40, and further improving the performance of the filter 100.

[0077] In some embodiments of the present application, the limiting member 50 is an alumina ceramic member.

[0078] In other words, the stopper 50 is made of alumina ceramics. Alumina ceramics have a large structural strength. By using alumina ceramics to make the stopper 50, the structural strength of the stopper 50 is effectively improved, so that the stopper 50 can better withstand the extrusion force of the dielectric resonator 40 and the cavity 10 along the length direction of the dielectric resonator 40, effectively reducing the risk of the stopper 50 breaking, thereby further improving the performance of the filter 100.

[0079] In some other embodiments of the present application, the limiting member 50 and the dielectric resonator 40 are both microwave dielectric ceramic members.

[0080] In other words, both the limiting member 50 and the dielectric resonator 40 are made of microwave dielectric ceramics.

[0081] In some embodiments, the stopper 50 and the dielectric resonator 40 are in contact with each other along the length direction of the dielectric resonator 40 .

[0082] By adopting the above technical solution, the size of the dielectric resonant structure in the filter 100 can be increased while the volume of the filter 100 remains unchanged, thereby further improving the performance of the filter 100.

[0083] In some embodiments of this application, please refer to Figure 1 and Figure 2 The filter 100 further includes a tuning member 70 , which is mounted on the cover 20 and can reciprocate along the thickness direction of the cover 20 , so that at least a portion of the tuning member 70 is inserted into the resonant cavity 30 .

[0084] The tuning member 70 is a component for adjusting the resonant frequency of the filter 100. It can be understood that the tuning member 70 is mounted on the cover 20, and when at least a portion of the tuning member 70 is inserted into the resonant cavity 30, the portion of the tuning member 70 inserted into the resonant cavity 30 is spaced apart from the dielectric resonator 40, that is, the portion of the tuning member 70 inserted into the resonant cavity 30 does not contact the dielectric resonator 40. By moving the tuning member 70 along the thickness direction of the cover 20, the length of the portion of the tuning member 70 inserted into the resonant cavity 30 can be changed, thereby adjusting the resonant frequency of the filter 100.

[0085] In some embodiments, a threaded hole is opened on the cover body 20, and the threaded hole penetrates the cover body 20 along the thickness direction of the cover body 20. The tuning component 70 is a rod-shaped structure, and an external thread is provided on the tuning component 70. The tuning component 70 cooperates with the internal thread of the threaded hole through the external thread. The tuning component 70 can be screwed in a clockwise direction or a counterclockwise direction to move the tuning component 70 along the thickness direction of the cover body 20.

[0086] By adopting the above technical solution, it is convenient to adjust the resonant frequency of the filter 100.

[0087] In some embodiments of this application, please refer to Figure 2 and Figure 3 The dielectric resonator 40 is provided with a first resonance hole 44 that passes through the first end surface 41 and the second end surface 42, at least a portion of the tuning member 70 is inserted into the first resonance hole 44, the cavity 10 is provided with a second resonance hole 14, and the limiting member 50 is provided with a through hole 51 for the tuning member 70 to pass through, and the through hole 51 is used to connect the first resonance hole 44 and the second resonance hole 14.

[0088] In some embodiments, the first resonance hole 44 passes through the first end face 41 and the second end face 42 along the length direction of the dielectric resonator 40, the limiter 50 is an annular structure, and the inner annular space of the limiter 50 constitutes the above-mentioned through hole 51, and the through hole 51 is used to connect the first resonance hole 44 and the second resonance hole 14, that is, when the tuning component 70 moves along the thickness direction of the cover body 20 toward the direction close to the dielectric resonator 40, the tuning component 70 can extend from the first resonance hole 44 through the through hole 51 into the second resonance hole 14.

[0089] In some embodiments, when the cover body 20 is provided with the above-mentioned threaded hole, the threaded hole, the first resonance hole 44, the through hole 51 and the second resonance hole 14 can be coaxially arranged, that is, the hole axis of the threaded hole, the hole axis of the first resonance hole 44, the hole axis of the through hole 51 and the hole axis of the second resonance hole 14 coincide with each other.

[0090] By adopting the above technical solution, the interference between the limit member 50 and the tuning member 70 can be effectively improved, thereby effectively increasing the maximum length of the portion of the tuning member 70 extending into the resonant cavity 30, and effectively increasing the resonant frequency adjustment range of the filter 100; and, the cavity 10 is provided with a second resonant hole 14, which can effectively reduce the weight of the cavity 10, and then reduce the weight of the filter 100, which is conducive to the lightweight of the filter 100.

[0091] In some embodiments of this application, please refer to Figure 2 The cavity 10 includes a main body 11 and a support seat 12. The cover 20 is covered on the main body 11 and encloses the main body 11 to form a resonant cavity 30. The support seat 12 is connected to the inner wall surface of the main body 11 and abuts against at least a portion of the second end surface 42.

[0092] The main body 11 refers to the main part of the cavity 10 , and the main body 11 is used to define the internal environment of the filter 100 . The resonant cavity 30 is formed by covering the cover 20 on the main body 11 to enclose the main body 11 .

[0093] The support seat 12 is disposed on the inner bottom surface of the main body 11 and protrudes toward the direction close to the dielectric resonator 40, so that the support seat 12 abuts against the second end surface 42 of the dielectric resonator 40. The support seat 12 can be integrally formed with the main body 11, for example, the support seat 12 and the main body 11 are integrally formed by a casting process, or the support seat 12 and the main body 11 can be separately formed and then connected to each other into a whole, for example, the support seat 12 and the main body 11 are welded to each other.

[0094] In some embodiments, when the cavity 10 is provided with a second limiting groove 13 and a second resonance hole 14, the second limiting groove 13 is recessed on the end surface of the support seat 12 facing the dielectric resonator 40, and the second resonance hole 14 is arranged on the side of the second limiting groove 13 facing away from the dielectric resonator 40 and passes through the bottom of the second limiting groove 13.

[0095] By adopting the above technical solution, it is convenient to abut the dielectric resonator 40 against the cavity 10 .

[0096] In some embodiments of this application, please refer to Figure 4 The cover body 20 includes a connecting portion 21 connected to the cavity 10 and a deformable portion 22 for abutting the first end face 41. The connecting portion 21 is provided with a third limiting groove 211. The filter 100 also includes an elastic member 80. The elastic member 80 includes a fixing portion 81 and an elastic portion 82. The fixing portion 81 is inserted into the third limiting groove 211 to limit the fixing portion 81 from moving in a direction away from the resonant cavity 30 along the thickness direction of the cover body 20. The elastic portion 82 is pressed against the side of the deformable portion 22 facing away from the first end face 41.

[0097] The connecting portion 21 is a portion for connecting the cavity 10 , and the deforming portion 22 refers to a portion that can be deformed along the thickness direction of the cover body 20 when subjected to an external force parallel to or inclined to the thickness direction of the cover body 20 .

[0098] The elastic member 80 refers to a member capable of elastic deformation. The elastic member 80 may be, but is not limited to, a spring sheet, an elastic steel plate, etc. The number of the elastic member 80 may be one or more. When the number of the elastic member 80 is more than one, the multiple elastic members 80 may be integrally formed, or may be independently formed and then connected to form a whole, or may be spaced apart from each other.

[0099] In some embodiments, the rigidity of the connection portion 21 is greater than the rigidity of the deformation portion 22. For example, the thickness of at least part of the deformation portion 22 can be reduced so that the thickness of the part is less than the minimum thickness of the connection portion 21, thereby making the rigidity of the connection portion 21 greater than the rigidity of the deformation portion 22. For another example, the rigidity of the material of the connection portion 21 can be made greater than the rigidity of the material of the deformation portion 22, that is, the rigidity of the material used to make the connection portion 21 is greater than the rigidity of the material used to make the deformation portion 22.

[0100] In some embodiments, the deformation portion 22 includes a cover plate 221 and a boss 222, the boss 222 is convexly arranged on the side of the cover plate 221 facing away from the first end surface 41 and located in the middle of the cover plate 221, the connection portion 21 is arranged around the cover plate 221, and the inner periphery of the connection portion 21 is connected to the outer periphery of the cover plate 221, and the inner periphery of the connection portion 21 is recessed with the third limiting groove 211 in the direction away from the cover plate 221. The fixing portion 81 of the elastic member 80 is inserted into the third limiting groove 211, and the elastic portion 82 of the elastic member 80 is pressed against the boss 222 to apply a downward pressure directed to the first end surface 41 to the boss 222. As an example, in the case where the cover body 20 is provided with a threaded hole, the threaded hole can be provided on the boss 222 and penetrate the cover plate 221, that is, the tuning member 70 is penetrated through the boss 222 and the cover plate 221.

[0101] In some embodiments, there are multiple elastic members 80, and the multiple elastic members 80 are evenly distributed along the circumference of the above-mentioned boss 222. Accordingly, the above-mentioned third limiting groove 211 is an annular structure and is arranged around the above-mentioned boss 222. The fixing parts 81 of the multiple elastic members 80 are all inserted into the third limiting groove 211, and the elastic parts 82 of the multiple elastic members 80 are all pressed against the above-mentioned boss 222.

[0102] By adopting the above technical solution, under the elastic action of the elastic member 80, the deformation portion 22 can be pressed against the first end surface 41 of the dielectric resonator 40 in the direction close to the dielectric resonator 40, so that the deformation portion 22 can fully contact with the dielectric resonator 40, thereby further improving the performance of the filter 100.

[0103] In some embodiments of this application, please refer to Figure 1 and Figure 2 The filter 100 may further include a connector 90 for connecting a communication component. In some embodiments, the number of the connectors 90 is two, one connector 90 is for receiving an electrical signal, and the other connector 90 is for outputting an electrical signal, and the two connectors 90 are disposed on opposite sides of the cavity 10.

[0104] In a second aspect, an embodiment of the present application provides a communication device, comprising the filter 100 described in any one of the above embodiments.

[0105] The communication device provided in the embodiment of the present application adopts the filter 100 described in any of the above embodiments, thereby effectively improving the performance of the communication device.

[0106] The above are only optional embodiments of the present application and are not intended to limit the present application. For those skilled in the art, the present application may have various changes and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application should be included in the scope of the claims of the present application.

Claims

1. A filter, characterized in that: The filter comprises: Cavity; A cover body, which is disposed on the cavity and encloses the cavity to form a resonant cavity; A dielectric resonator is accommodated in the resonant cavity, the dielectric resonator has a first end surface and a second end surface which are arranged opposite to each other, the first end surface abuts against the cover body, the second end surface abuts against the cavity and is concavely provided with a first limiting groove; A limiting member, one end of which is connected to the cavity, and the other end of which is inserted into the first limiting groove, and the outer peripheral wall of the limiting member is gap-matched with the groove wall of the first limiting groove.

2. The filter according to claim 1, characterized in that The filter further includes a buffer member, at least a portion of which is disposed between an outer peripheral wall of the limiting member and a groove wall of the first limiting groove.

3. The filter according to claim 2, characterized in that The limiting member is bonded to the groove wall of the first limiting groove through the buffer member.

4. The filter according to claim 1, characterized in that The width of the gap between the outer peripheral wall of the limiting member and the groove wall of the first limiting groove is less than or equal to 0.1 mm.

5. The filter according to claim 1, characterized in that The second end surface includes a limiting area and a contact area, the first limiting groove is recessed in the limiting area, and the contact area is annularly arranged in the limiting area and is used to contact the cavity.

6. The filter according to any one of claims 1 to 5, characterized in that: A second limiting groove is concavely formed on the inner wall surface of the cavity facing the second end surface, and the limiting member is inserted into the second limiting groove.

7. The filter according to any one of claims 1 to 5, characterized in that: The expansion coefficient of the stopper is 8×10 -6 m / K-10×10 -6 m / K.

8. The filter according to claim 7, characterized in that The limiting member is an alumina ceramic member; or, the limiting member and the dielectric resonator member are both microwave dielectric ceramic members.

9. The filter according to any one of claims 1 to 5, characterized in that: The filter also includes a tuning component, which is installed on the cover body and can move back and forth along the thickness direction of the cover body so that at least a portion of the tuning component is inserted into the resonant cavity; the dielectric resonator is provided with a first resonant hole that passes through the first end face and the second end face, and at least a portion of the tuning component is inserted into the first resonant hole, the cavity is provided with a second resonant hole, and the limiting component is provided with a through hole for the tuning component to pass through, and the through hole is used to connect the first resonant hole and the second resonant hole.

10. The filter according to any one of claims 1 to 5, characterized in that: The cavity comprises a main body and a support seat, the cover body is covered on the main body and encloses the main body to form the resonance cavity, and the support seat is connected to the inner wall surface of the main body and abuts against at least a part of the second end surface.

11. The filter according to any one of claims 1 to 5, characterized in that: The cover body includes a connecting portion connected to the cavity and a deformable portion for abutting the first end face, the connecting portion is provided with a third limiting groove, the filter also includes an elastic member, the elastic member includes a fixed portion and an elastic portion, the fixed portion is inserted into the third limiting groove to limit the fixed portion from moving in a direction away from the resonant cavity along the thickness direction of the cover body, and the elastic portion is pressed against the side of the deformable portion facing away from the first end face.

12. A communication device, characterized in that: The communication device comprises the filter according to any one of claims 1-11.

Images