Cavity filter, mounting structure and assembling method

Abstract

The invention belongs to the technical field of printed circuit board production, and particularly relates to a cavity filter, a mounting structure and an assembling method, and the cavity filter comprises a resonance main body which is provided with a first surface and a second surface which are oppositely arranged; the two side plates are connected to the first surface and the second surface of the resonance main body respectively, a plurality of weld legs are arranged on the surfaces, back to the resonance main body, of the side plates, and the weld legs are arranged at intervals in the length direction of the resonance main body. According to the cavity filter, the plurality of welding pins are arranged on the surfaces, back to the resonance main body, of the side plates, so that contact points and fixing points of the side plates and the PCB are increased, and the connection reliability is improved; the plurality of welding pins are arranged at intervals along the length direction of the resonance main body, so that the welding stress is uniformly distributed, the damage of local concentrated stress to the structure is reduced, and the durability of the whole structure is enhanced.

Description

Technical Field

[0001] The present application relates to the technical field of printed circuit board production, and in particular to a cavity filter, a mounting structure and an assembly method. Background Art

[0002] In today's highly developed communications field, cavity filters play a key role in optimizing signal transmission quality.

[0003] Existing cavity filters are generally fixed by screws and PCB boards. However, this method has many limitations. The screw fixing method requires drilling holes in the cavity filter and PCB board, which not only increases the processing complexity of the PCB board, but also may destroy the integrity of the circuit layout of the PCB board and the structural stability of the cavity filter, affecting the stability of signal transmission.

[0004] During the installation process, tightening the screws one by one is cumbersome and inefficient, and requires high skills from the operator. It is easy to have loose fixation due to inconsistent tightening force. During long-term use, the screws may become loose due to factors such as vibration and temperature changes, which in turn affects the connection reliability between the cavity filter and the PCB board and reduces the performance of the filter. Moreover, when the cavity filter needs to be repaired or replaced, the screw removal process is relatively complicated, which can easily cause damage to the PCB board and the filter, increasing maintenance costs and time.

[0005] It should be noted that the information disclosed in the above background technology section is only used to enhance the understanding of the background of the present disclosure, and therefore may include information that does not constitute the prior art known to ordinary technicians in the field. Summary of the invention

[0006] In view of at least one of the above technical problems, the present application provides a cavity filter, a mounting structure and an assembly method, which solves the problem that the existing cavity filters are generally installed and fixed with screws and PCB boards, which easily destroys the integrity of the circuit layout of the PCB board.

[0007] In a first aspect, a cavity filter is provided, comprising:

[0008] The resonant body has a first surface and a second surface which are arranged opposite to each other;

[0009] The side plate has two and is respectively connected to the first surface and the second surface of the resonance body. The surface of the side plate facing away from the resonance body is provided with a plurality of welding feet, and the plurality of welding feet are arranged at intervals along the length direction of the resonance body.

[0010] One of the above technical solutions has at least one of the following advantages or beneficial effects: the cavity filter increases the contact points and fixing points between the side plate and the PCB board by arranging multiple solder feet on the surface of the side plate facing away from the resonant body, thereby improving the reliability of the connection; by arranging the multiple solder feet at intervals along the length direction of the resonant body, uniform distribution of welding stress is achieved, the damage to the structure caused by local concentrated stress is reduced, and the durability of the overall structure is enhanced.

[0011] In some possible implementations, the resonant body is square.

[0012] In some possible implementations, the welding foot and the side panel are an integrally formed structure.

[0013] In some possible implementations, a plurality of first mounting holes are provided on the side panel, and a plurality of second mounting holes are provided on the resonant body. Both the first mounting holes and the second mounting holes extend along the width direction of the resonant body. The first mounting holes correspond to the second mounting holes one by one, and a mounting screw is passed through the first mounting holes and the second mounting holes.

[0014] In some possible implementations, a resonant cavity is provided in the resonant body, and the resonant cavity passes through the first surface and the second surface. A plurality of tuning mechanisms are provided on the resonant body, and the tuning mechanisms extend along the height direction of the resonant body. The resonant body also has an input mechanism and an output mechanism, and the input mechanism is connected to one tuning mechanism, and the output mechanism is connected to another tuning mechanism, and both the input mechanism and the output mechanism extend along the length direction of the resonant body.

[0015] In some possible implementations, the tuning mechanism includes: a resonant column and a tuning screw, the resonant column has multiple and is arranged in a comb shape in the resonant cavity, the tuning screw has multiple and is passed through the resonant body, the tuning screws correspond to the resonant columns one by one, the input mechanism is connected to one resonant column, and the output mechanism is connected to another resonant column.

[0016] In some possible implementations, the resonant column includes: a connecting portion and a head portion connected to each other, the connecting portion is connected to the inner surface of the resonant cavity, and a tuning space is formed between the head portion and the tuning screw.

[0017] In some possible implementations, the resonant body is provided with a through hole communicating with the resonant cavity, and the tuning screw is passed through the through hole.

[0018] In a second aspect, a mounting structure is provided, comprising:

[0019] A PCB board having a plurality of pads;

[0020] The cavity filter is welded to the pad through the welding foot.

[0021] In a third aspect, a method for assembling a mounting structure is provided, comprising:

[0022] Apply solder paste on the pads of the PCB board;

[0023] Make the solder pins on the cavity filter contact with the solder paste on the pad, and bond the four corners of the cavity filter to the PCB board;

[0024] Place the assembled PCB board in the reflow soldering automatic line and solder the solder feet and pads.

[0025] The present application is further described below in conjunction with the accompanying drawings and embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the prior art 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.

[0027] Figure 1 An exploded view of a cavity filter provided in an embodiment of the present application;

[0028] Figure 2 A front view of the resonant body provided in an embodiment of the present application;

[0029] Figure 3 A schematic diagram of the structure of the installation structure provided in the embodiment of the present application;

[0030] In the figure: 100, PCB board; 110, mounting slot;

[0031] 200, cavity filter; 210, resonant body; 220, side plate;

[0032] 211, first surface; 212, second surface; 213, second mounting hole; 214, resonant cavity; 215, tuning mechanism; 216, input mechanism; 217, output mechanism;

[0033] 2151, resonant column; 2152, tuning screw; 2153, connecting part; 2154, head;

[0034] 221, welding foot; 222, first mounting hole; DETAILED DESCRIPTION

[0035] In order to make the above-mentioned purposes, features and advantages of the present application more obvious and easy to understand, the specific embodiments of the present application are described in detail below in conjunction with the accompanying drawings. In the following description, many specific details are set forth to facilitate a full understanding of the present application. However, the present application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without violating the connotation of the present application, so the present application is not limited by the specific embodiments disclosed below.

[0036] In the description of the present application, it should be understood that the terms "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do 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 should not be understood as a limitation on the present application.

[0037] In the description of the present application, unless otherwise clearly specified and limited, a first feature being “above” or “below” a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being “above”, “above”, and “above” a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being “below”, “below”, and “below” a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0038] It should be noted that if an element is referred to as being "fixed to" or "disposed on" another element, it may be directly on the other element or there may be a central element. If an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. If any, the terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used in this application are for illustrative purposes only and do not represent the only implementation method.

[0039] In the description of the present application, it should be understood that the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of the features. In the description of the present application, "plurality" means at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0040] In the embodiments of the present application, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral one; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the embodiments of the present application can be understood according to the specific circumstances.

[0041] like Figure 1 and Figure 2 As shown, the embodiment of the present application provides a cavity filter 200 , including: a resonant body 210 and a side plate 220 .

[0042] Among them, the resonant body 210 has a first surface 211 and a second surface 212 arranged opposite to each other; the side plate 220 has two first surfaces 211 and a second surface 212 respectively connected to the resonant body 210, and a plurality of welding feet 221 are arranged on the surface of the side plate 220 facing away from the resonant body 210, and the plurality of welding feet 221 are arranged at intervals along the length direction of the resonant body 210.

[0043] It can be understood that the length direction of the resonance body 210 corresponds to the L axis of the space coordinate axis, the width direction of the resonance body 210 corresponds to the W axis of the space coordinate axis, and the height direction of the resonance body 210 corresponds to the H axis of the space coordinate axis.

[0044] In this embodiment, the length of the solder foot 221 is 2 mm, the width of the solder foot 221 is 0.5 mm, and the height of the solder foot 221 is 0.5 mm.

[0045] The cavity filter 200 increases the contact points and fixing points between the side plate 220 and the PCB board 100 by arranging a plurality of solder feet 221 on the surface of the side plate 220 facing away from the resonant body 210, thereby improving the reliability of the connection; and uniformly distributes the soldering stress by arranging the plurality of solder feet 221 at intervals along the length direction of the resonant body 210, thereby reducing the damage to the structure caused by local concentrated stress and enhancing the durability of the overall structure.

[0046] like Figure 1 and Figure 2 As shown, in some embodiments, the resonant body is square.

[0047] like Figure 1 and Figure 2 As shown, in some embodiments, the welding foot 221 and the side plate 220 are integrally formed, which can improve the connection stability between the welding foot 221 and the side plate 220.

[0048] like Figure 1 and Figure 2 As shown, in some embodiments, a plurality of first mounting holes 222 are provided on the side plate 220, and a plurality of second mounting holes 213 are provided on the resonance body 210. The first mounting holes 222 and the second mounting holes 213 both extend along the width direction of the resonance body 210. The first mounting holes 222 correspond to the second mounting holes 213 one by one, and a mounting screw is passed through the first mounting hole 222 and the second mounting hole 213. In this way, on the one hand, the side plate 220 and the resonance body 210 are detachably connected by the mounting screws, which is convenient for assembly and use; on the other hand, after the side plate 220 and the resonance body 210 are fastened, the resonance cavity 214 can be well grounded, and the electrical integrity of the resonance cavity 214 can be achieved.

[0049] like Figure 1 and Figure 2 As shown, in some embodiments, the resonant body 210 is provided with a resonant cavity 214, the resonant cavity 214 penetrates the first surface 211 and the second surface 212, a plurality of tuning mechanisms 215 are provided on the resonant body 210, the tuning mechanisms 215 extend along the height direction of the resonant body 210, and the resonant body 210 also has an input mechanism 216 and an output mechanism 217, the input mechanism 216 is connected to one tuning mechanism 215, the output mechanism 217 is connected to another tuning mechanism 215, and the input mechanism 216 and the output mechanism 217 both extend along the length direction of the resonant body 210. In this way, the resonant cavity 214 can be adjusted through the tuning mechanism 215, thereby changing the output filter response curve; and the input mechanism 216 and the output mechanism 217 are used for welding with the PCB board 100 to realize the input and output of signals.

[0050] Specifically, the tuning mechanism 215 may include: a resonant column 2151 and a tuning screw 2152, wherein the resonant column 2151 has a plurality of resonant columns and is arranged in a comb shape in the resonant cavity 214, the tuning screw 2152 has a plurality of resonant columns and is penetrated through the resonant body 210, the tuning screw 2152 corresponds to the resonant column 2151 one by one, the input mechanism 216 is connected to one resonant column 2151, and the output mechanism 217 is connected to another resonant column 2151. In this way, by turning the tuning screw 2152, the depth of the tuning screw 2152 embedded in the resonant cavity 214 is adjusted, and then the frequency of the resonant cavity 214 can be fine-tuned to achieve the frequency selection of the filter, thereby changing the output filter response curve.

[0051] In this embodiment, there are seven resonant columns 2151 , and two adjacent resonant columns 2151 are respectively disposed on two opposite inner surfaces of the resonant cavity 214 .

[0052] The resonant column 2151 includes: a connecting portion 2153 and a head portion 2154 connected to each other, the connecting portion 2153 is connected to the inner surface of the resonant cavity 214, and a tuning space is formed between the head portion and the tuning screw. For example, by turning the tuning screw 2152, the gap size of the tuning space between the tuning screw and the head portion can be adjusted.

[0053] Specifically, the input mechanism 216 may include: a first glass insulator, one end of which is connected to the PCB board 100, and the other end of which is connected to a resonant column 2151, for receiving radio frequency signals. A first receiving hole is provided on the resonant column 2151 close to the first glass insulator, and one end of the first glass insulator extends into the first receiving hole and is connected to the resonant column 2151.

[0054] Specifically, the output mechanism 217 may include: a second glass insulator, one end of which is connected to the PCB board 100, and the other end of which is connected to a resonant column 2151, for outputting the processed RF signal. A second receiving hole is provided on the resonant column 2151 close to the second glass insulator, and one end of the second glass insulator extends into the second receiving hole and is connected to the resonant column 2151.

[0055] like Figure 1 and Figure 2 As shown, in some embodiments, the resonant body 210 is provided with a through hole connected to the resonant cavity 214, and the tuning screw 2152 is passed through the through hole. In this way, the tuning screw 2152 passes through the resonant body 210 through the through hole, so that the tuning screw 2152 can enter the resonant cavity 214 and finally selectively connect with the resonant column 2151.

[0056] like Figure 2 As shown, an embodiment of the present application further provides a mounting structure, including: a PCB board 100 and a cavity filter 200 .

[0057] The PCB board 100 has a plurality of pads; the cavity filter 200 is welded to the pads via welding feet 221 .

[0058] The PCB board may or may not be provided with a mounting groove, and the PCB board is not limited thereto.

[0059] When a mounting groove may be provided on the PCB board, the assembly method of the above-mentioned mounting structure may include: brushing solder paste on the soldering pad of the PCB board 100; placing the cavity filter 200 in the mounting groove 110, so that the solder foot 221 contacts the solder paste on the soldering pad, and bonding the four corners of the cavity filter 200 to the PCB board 100; placing the assembled PCB board 100 in a reflow soldering automatic line, and soldering the solder foot 221 to the soldering pad.

[0060] The above are only preferred embodiments of the present application, and do not constitute any formal limitation on the present application. Any technician familiar with the art can use the above disclosed methods and technical contents to make many possible changes and modifications to the technical solution of the present application without departing from the scope of the technical solution of the present application, or modify it into an equivalent embodiment of equivalent changes. Therefore, all equivalent changes made according to the shape, structure and principle of the present application without departing from the content of the technical solution of the present application should be included in the protection scope of the present application.

Claims

1. A cavity filter, characterized in that: include: The resonant body has a first surface and a second surface which are arranged opposite to each other; The side plates have two and are respectively connected to the first surface and the second surface of the resonant body. The surface of the side plates facing away from the resonant body is provided with a plurality of welding feet, and the plurality of welding feet are arranged at intervals along the length direction of the resonant body.

2. The cavity filter according to claim 1, characterized in that: The resonant body is in a square shape.

3. The cavity filter according to claim 1 or 2, characterized in that: The welding foot and the side plate are an integrally formed structure.

4. The cavity filter according to claim 1, characterized in that: The side plate is provided with a plurality of first mounting holes, and the resonant body is provided with a plurality of second mounting holes, the first mounting holes and the second mounting holes both extend along the width direction of the resonant body, the first mounting holes correspond to the second mounting holes one by one, and a mounting screw is passed through the first mounting hole and the second mounting hole.

5. The cavity filter according to claim 1, characterized in that: The resonant body is provided with a resonant cavity, and the resonant cavity runs through the first surface and the second surface. The resonant body is provided with a plurality of tuning mechanisms, and the tuning mechanisms extend along the height direction of the resonant body. The resonant body is also provided with an input mechanism and an output mechanism, and the input mechanism is connected to one of the tuning mechanisms, and the output mechanism is connected to another of the tuning mechanisms, and the input mechanism and the output mechanism both extend along the length direction of the resonant body.

6. The cavity filter according to claim 5, characterized in that: The tuning mechanism includes: a resonant column and a tuning screw. The resonant column has multiple resonant columns and is arranged in a comb shape in the resonant cavity. The tuning screw has multiple resonant columns and is passed through the resonant body. The tuning screws correspond to the resonant columns one by one. The input mechanism is connected to one of the resonant columns, and the output mechanism is connected to another of the resonant columns.

7. The cavity filter according to claim 6, characterized in that: The resonant column comprises: a connecting portion and a head portion which are connected to each other, wherein the connecting portion is connected to the inner surface of the resonant cavity, and the head portion forms a tuning space between the head portion and the tuning screw.

8. The cavity filter according to claim 5, characterized in that: The resonant body is provided with a through hole communicating with the resonant cavity, and the tuning screw is passed through the through hole.

9. A mounting structure, characterized in that: include: A PCB board having a plurality of pads; The cavity filter according to claim 1 is welded to the welding pad via the welding foot.

10. An assembly method of the mounting structure according to claim 9, characterized in that: include: Apply solder paste on the pads of the PCB; Make the solder pins on the cavity filter contact with the solder paste on the pad, and bond the four corners of the cavity filter to the PCB board; Place the assembled PCB board in the reflow soldering automatic line and solder the solder feet and pads.

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