Cavity filter capable of improving tangential and axial stress

Abstract

The utility model discloses a cavity filter capable of improving tangential and axial stress, which comprises a cavity, a cover plate, a resonator, a tuning assembly, an input connector and an output connector, the cover plate covers the open end of the cavity, the resonator is arranged in the cavity, the input connector and the output connector are connected with the resonator, and the tuning assembly is arranged in the cavity. The tuning assembly is arranged on the cavity and / or the cover plate, a plurality of limiting bosses are arranged on the cavity and / or the cover plate, and the cover plate can abut against the limiting bosses when covering the open end of the cavity so as to construct a gap used for containing solder paste; by means of the structure, it is ensured that a proper space is reserved, solder paste on the welding face is prevented from being squeezed and overflowing in the assembling process, the solder paste cannot be fully filled, and the welding strength is affected, and the good practicability is achieved.

Description

TECHNICAL FIELD

[0001] The utility model relates to the cavity filter field, especially in a kind of cavity filter that can improve tangential and axial stress. BACKGROUND

[0002] Filter is a typical frequency selection device, it can effectively suppress unwanted signal, so that it cannot pass through filter, only useful signal passes through filter smoothly, therefore, the pros and cons of filter performance directly affect the quality of entire communication system, is important device in modern microwave, millimeter wave communication system;Cavity filter is a very important filter, compared with other properties filter, its structure is firm, performance is stable and reliable, small, superhigh temperature resistant, Q value is moderate, high-end parasitic passband is far and good heat dissipation performance.

[0003] The existing cavity filter is usually composed of cavity, cover plate, resonance, tuning screw and input and output connector, and the connection of cover plate and cavity adopts solder paste+screw fixed welding: first, appropriate amount of solder paste is covered on the cavity, then the cover plate is installed and fixed with screw, then the solder paste is melted by reflow soldering heating, so that the connection of the two is realized;Due to performance requirements, the cavity and the cover plate are usually made of materials with different expansion coefficients, under some severe test conditions (rapid temperature change, long-term temperature cycle), the solder paste between the cover plate and the cavity has the risk of tearing, which causes the performance failure of the filter, such as out-of-band rejection, return loss, intermodulation, standing wave, etc.;Therefore, there is an urgent need for a cavity filter that can improve tangential and axial stress to solve the above problems. SUMMARY

[0004] The utility model aims at at least one of the technical problems existing in prior art. To this end, the utility model provides a cavity filter that can improve tangential and axial stress.

[0005] The technical scheme adopted by one embodiment of the utility model to solve its technical problem is: a cavity filter that can improve tangential and axial stress, comprising a cavity, a cover plate, a resonator, a tuning assembly, an input connector and an output connector, the cover plate is covered on the open end of the cavity, the resonator is arranged in the cavity, the input connector and the output connector are connected with the resonator, the tuning assembly is arranged on the cavity and / or the cover plate, a plurality of limiting bosses are arranged on the cavity and / or the cover plate, the cover plate can abut against the limiting boss when being covered on the open end of the cavity, so as to form a gap for accommodating solder paste.

[0006] As one of the preferred embodiments of the utility model, the height of the limiting boss is set to 0.01-0.3mm.

[0007] As one of the preferred embodiments of the utility model, one of the cavity and the cover plate is provided with a fixed column, the other of the cavity and the cover plate is provided with a fixed hole, and the fixed column can be inserted into the fixed hole when the cover plate is covered on the cavity.

[0008] As one of the preferred embodiments of the utility model, the height of the fixed column is 0.1-3mm.

[0009] As one of the preferred embodiments of the utility model, the gap between the fixed column and the fixed hole is greater than or equal to 0.02mm.

[0010] As one of the preferred embodiments of the utility model, the cavity filter capable of improving tangential stress and axial stress further comprises a plurality of bolts, the cavity is provided with a plurality of threaded holes, the cover plate is provided with a plurality of through holes, the bolts are inserted into the through holes and connected with the threaded holes, and the limiting bosses are arranged on the circumferential side of the threaded holes and / or the through holes.

[0011] As one of the preferred embodiments of the utility model, the cavity filter capable of improving tangential stress and axial stress further comprises a spacer plate arranged in the cavity and located between the resonators.

[0012] As one of the preferred embodiments of the utility model, the spacer plate is integrally formed with the cavity.

[0013] The utility model discloses the beneficial effect: a cavity filter capable of improving tangential stress and axial stress, including cavity, cover plate, resonator, tuning assembly, input connector and output connector, the cover plate is covered in the open end of the cavity, the resonator is arranged in the cavity, and input connector and output connector are connected with the resonator, and the tuning assembly is arranged on the cavity and / or cover plate, and a plurality of limiting bosses are arranged on the cavity and / or cover plate, and the cover plate can be in contact with the limiting boss when being covered in the open end of the cavity, to construct the gap for containing the tin paste, the structure is reserved with proper space, prevents the tin paste of the welding surface from being extruded and overflowing a large amount in the process of assembling, causes the tin paste to be unable to fill fully, influences the welding strength, has very good practicality. ACCURACY OF DRAWINGS

[0014] The above and / or additional aspects and advantages of the utility model will become apparent and more readily appreciated from the following description of the embodiments, with reference to the following drawings, in which:

[0015] Figure 1 It is an exploded view of the cavity filter capable of improving tangential stress and axial stress;

[0016] Figure 2 It is a partial structure schematic view of the cavity filter capable of improving tangential stress and axial stress;

[0017] Figure 3 It is Figure 1A local enlarged view of the middle A region. DETAILED DESCRIPTION

[0018] This part will describe the specific embodiments of the utility model in detail, the preferred embodiment of the utility model is shown in the drawings, the role of the drawings is to supplement the description of the text part with graphics, so that people can intuitively and visually understand each technical feature and the overall technical scheme of the utility model, but it cannot be understood as the limitation of the protection scope of the utility model.

[0019] In the description of the utility model, the meaning of multiple is more than two, greater than, less than, more than, etc. is not included in the number, above, below, etc. is included in the number. If it is described as first, second, it is only used for distinguishing technical features for the purpose, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of indicated technical features or implicitly indicating the sequence of indicated technical features.

[0020] In the description of the utility model, it is understood that the position description, such as the position or location relationship indicated by up, down, front, back, left, right, etc. is based on the position or location relationship shown in the drawings, which is only for the convenience of describing the utility model and simplifying the description, and is not used to indicate or imply that the device or element indicated must have a specific position, be constructed and operated in a specific position, so it cannot be understood as the limitation of the utility model.

[0021] In the utility model, unless otherwise explicitly limited, the words such as "set", "install", "connect" should be understood broadly, for example, it can be directly connected, or indirectly connected through intermediate medium; it can be fixedly connected, or detachably connected, or integrally formed; it can be mechanically connected; it can be the communication or interaction relationship between two elements. The skilled in the art can reasonably determine the specific meaning of the above words in the utility model according to the specific content of the technical scheme.

[0022] Reference Figures 1 to 3 A cavity filter capable of improving tangential and axial stress, comprising a cavity 10, a cover plate 20, a resonator 30, a tuning assembly 40, an input connector 51 and an output connector 52, the cover plate 20 is covered on the open end of the cavity 10, the resonator 30 is arranged in the cavity 10, the input connector 51 and the output connector 52 are connected with the resonator 30, the tuning assembly 40 is arranged on the cavity 10 and / or the cover plate 20, a plurality of limiting bosses 60 are arranged on the cavity 10 and / or the cover plate 20, the cover plate 20 can abut against the limiting bosses 60 when covering the open end of the cavity 10, so as to construct a gap for accommodating the solder paste.

[0023] In the utility model, when assembling, after input connector 51 and output connector 52 are connected with resonator 30 and are placed and fixed in cavity 10, a proper amount of tin paste is coated on the end face of the opening end of cavity 10, then cover plate 20 is covered on the opening end of cavity 10, a plurality of limiting bosses 60 on the end face of the opening end of cavity 10 abut against cover plate 20, a gap exists between cover plate 20 and cavity 10, then fixing column 71 on cavity 10 is inserted into fixing hole 72 on cover plate 20, then bolt 81 is inserted into through hole 83 on cover plate 20 and is connected with threaded hole 82 on cavity 10, tin paste is melted by reflow soldering heating, thereby realizing the connection between cover plate 20 and cavity 10; it needs to be explained that limiting boss 60 is not limited to being arranged on cavity 10, but also can be arranged on cover plate 20, and the shape of limiting boss 60 can be circular, or any shape, such as triangular, quadrilateral, polygonal, special-shaped and the like; the utility model has the advantages that: through the above structure, a proper space is ensured, tin paste on the welding surface is prevented from being extruded and overflowing a large amount in the process of assembling, tin paste cannot be filled fully, welding strength is affected, and very good practicability is achieved.

[0024] In one embodiment, the height of the limiting boss 60 is set to 0.01-0.3mm.

[0025] In one embodiment, one of the cavity 10 and the cover plate 20 is provided with the fixing column 71, and the other of the cavity 10 and the cover plate 20 is provided with the fixing hole 72, and the fixing column 71 can be inserted into the fixing hole 72 when the cover plate 20 is covered on the cavity 10; in this setting, the cavity 10 or the cover plate 20 is provided with a plurality of fixing columns 71 of a certain height, and the corresponding positions are provided with matching fixing holes 72, the fixing columns 71 are extended from the fixing holes 72, the gap between the fixing column 71 and the fixing hole 72 can be completely filled and wrapped after the tin paste is melted, the plurality of fixing columns 71 can provide additional and more uniform support and fixation, can limit the relative displacement of the cavity 10 and the cover plate 20 in the tangential direction, reduce the deformation and displacement caused by the expansion difference of different materials, can disperse the stress that occurs in the temperature change, reduce the concentrated tangential and axial stress borne by the welding surface, enhance the bonding strength of the cavity 10 and the cover plate 20, improve the deformation of the cavity 10 and the cover plate 20 in the reliability test process, and maintain the stability of the structure and performance; in a further embodiment, a thinner cover plate 20 can be used, the stress generated by the thinner cover plate 20 when the temperature changes is smaller, thereby reducing the tensile stress between the cover plate 20 and the cavity 10, and the risk of cracking can be reduced.

[0026] In one embodiment, the height of the fixing column 71 is set to 0.1-3mm.

[0027] In one embodiment, the gap between the fixing column 71 and the fixing hole 72 is ≥0.02mm.

[0028] The cavity filter capable of improving tangential stress and axial stress further comprises a plurality of bolts 81, a plurality of threaded holes 82 are arranged on the cavity 10, a plurality of through holes 83 are arranged on the cover plate 20, the bolts 81 are arranged in the through holes 83 and connected with the threaded holes 82, and the limiting bosses 60 are arranged around the circumferences of the threaded holes 82 and / or the through holes 83.

[0029] In one embodiment, the cavity filter capable of improving tangential stress and axial stress further comprises a plurality of spacers 90 arranged in the cavity 10 and between the resonators 30.

[0030] Preferably, the spacers 90 are integrally formed with the cavity 10.

[0031] Of course, the utility model is not limited to the above-mentioned embodiments, and those skilled in the art can make equivalent modifications or replacements without departing from the spirit of the utility model, and these equivalent modifications and replacements are all included in the range defined by the claims of the present application.

Claims

1. A cavity filter capable of improving tangential and axial stresses, comprising a cavity (10), a cover plate (20), a resonator (30), a tuning assembly (40), an input connector (51) and an output connector (52), the cover plate (20) being provided on an open end of the cavity (10), the resonator (30) being provided in the cavity (10), the input connector (51) and the output connector (52) being connected to the resonator (30), the tuning assembly (40) being provided on the cavity (10) and / or the cover plate (20), characterized in that: The cavity (10) and / or the cover plate (20) are provided with a plurality of limiting bosses (60), the cover plate (20) can abut against the limiting bosses (60) when covering the opening end of the cavity (10), so as to form a gap for accommodating the solder paste.

2. The cavity filter capable of improving tangential and axial stresses according to claim 1, wherein: The height of the limiting boss (60) is 0.01-0.3mm.

3. The cavity filter capable of improving tangential and axial stresses according to claim 1, wherein: One of the cavity (10) and the cover plate (20) is provided with a fixing column (71), and the other of the cavity (10) and the cover plate (20) is provided with a fixing hole (72), the fixing column (71) can be inserted into the fixing hole (72) when the cover plate (20) covers the cavity (10).

4. The cavity filter capable of improving tangential and axial stresses according to claim 3, wherein: The height of the fixing column (71) is 0.1-3mm.

5. The cavity filter capable of improving tangential and axial stresses according to claim 3, wherein: The gap between the fixing column (71) and the fixing hole (72) is ≥0.02mm.

6. The cavity filter capable of improving tangential and axial stresses according to claim 1, wherein: Further comprising a plurality of bolts (81), the cavity (10) is provided with a plurality of threaded holes (82), the cover plate (20) is provided with a plurality of through holes (83), the bolt (81) is inserted into the through hole (83) and connected with the threaded hole (82), and the limiting boss (60) is annularly arranged on the periphery of the threaded hole (82) and / or the through hole (83).

7. The cavity filter capable of improving tangential and axial stresses according to claim 1, wherein: Further comprising a plurality of spacers (90) arranged in the cavity (10) and located between the resonators (30).

8. The cavity filter capable of improving tangential and axial stresses according to claim 7, characterized in that: The spacer (90) is integrally formed with the cavity (10).

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