WO2018098940A1

WO2018098940A1 - Thin-wall stretching cavity filter and manufacturing method thereof

Info

Publication number: WO2018098940A1
Application number: PCT/CN2017/077578
Authority: WO
Inventors: 罗庆; 维里蒂⋅迈克尔; 朱亮; 熊超
Original assignee: 凯镭思通讯设备（上海）有限公司
Priority date: 2016-11-30
Filing date: 2017-03-21
Publication date: 2018-06-07
Also published as: CN108123194A

Abstract

Disclosed are a thin-wall stretching cavity filter and a manufacturing method thereof. The thin-wall stretching cavity filter comprises a cavity wall, resonator posts, tuning screws, and a connector cable assembly, the cavity wall being formed by stretching, the resonant posts being located inside the cavity wall, the tuning screws being connected to the cavity wall, and the connector cable assembly being located outside the cavity wall. The manufacturing method includes stretching a metal material to form a cavity wall, the cavity wall comprising an upper cavity wall and a lower cavity wall; welding the cavity wall with the tuning screws, the resonant posts and the connector cable assembly at a high temperature; and welding the upper cavity wall and the cavity wall at a low temperature. Compared with the prior art, the invention has the advantages of less manufacturing time, short assembly time, light weight, and convenient welding.

Description

Thin-wall stretching cavity filter and manufacturing method thereof

Technical field

The present invention relates to a cavity filter, and more particularly to a thin wall stretching cavity filter and a method of fabricating the same.

Background technique

With the continuous advancement of wireless communication technology, spectrum resources are increasingly tight, and the requirements for filters are getting higher and higher. Therefore, more and more parts manufacturing processes and product assembly processes are used in the design of the cavity filter to meet the needs of different customers. The current filter cavity manufacturing process is organic processing, die casting, etc. These two manufacturing processes have high material and processing costs or high cost of die casting molds, and the production cycle is long. In addition, the use of screw-on filter components consumes a large amount of assembly time in the filter production process, while also increasing the weight of the product. The traditional cavity filter has the following limitations: 1) long machining time and more processing waste; 2) high cost of mold for die-casting mold, long mold production cycle; 3) product wall thickness and weight.

Summary of the invention

SUMMARY OF THE INVENTION An object of the present invention is to provide a thin-walled stretching cavity filter and a method of fabricating the same.

The object of the present invention can be achieved by the following technical solutions:

A thin wall drawing cavity filter comprising a cavity wall, a resonant column, a tuning screw and a joint cable assembly, the cavity wall being formed by stretching, the resonant column being located inside a cavity surrounded by the cavity wall The tuning screw is coupled to a cavity wall, the connector cable assembly being external to the cavity wall.

The cavity wall includes an upper cavity wall and a lower cavity wall, the upper cavity wall and the lower cavity wall being welded by a low melting point solder paste, the upper cavity wall being connected to a tuning screw, the lower cavity The wall is coupled to the resonant column, and both the upper and lower cavity walls are coupled to the header cable assembly.

The upper cavity wall includes an upper cavity wall surface, an upper cavity flange surface and a turn hole, and the through hole is formed by stretching, and is located on the upper cavity wall surface and connected to the tuning screw, the upper cavity flange The upper cavity is formed with an upper cavity forming hole slot connected to the joint cable assembly.

The lower cavity wall includes a lower cavity wall surface, a lower cavity flange surface, and a protrusion, and the protrusion is stretched Formed on the lower cavity wall surface and connected to the resonant column, and the lower cavity flange surface is provided with a lower cavity forming hole groove connected to the joint cable assembly.

An intermediate cavity wall is further disposed between the upper cavity wall and the lower cavity wall, and the intermediate cavity wall is respectively connected to the upper cavity wall and the lower cavity wall through a flange.

The depth of the cavity enclosed by the upper cavity wall is equal to the depth of the cavity enclosed by the lower cavity wall.

The wall of the cavity has a thickness between 0.3 and 1.8 mm.

The resonant column and the connector cable assembly are both welded to the cavity wall by a high melting point solder paste.

A retaining wall is further disposed between the resonant columns, and the retaining wall is connected to the cavity wall.

A welding positioning connecting hole is further disposed on the wall of the cavity, and the welding positioning connecting hole is connected to the retaining wall.

A method of fabricating a thin-walled stretching cavity filter as described above, the method comprising the steps of:

1) stretching the metal material to form a cavity wall, the cavity wall including an upper cavity wall and a lower cavity wall;

2) high temperature welding of the cavity wall with the resonant column and the joint cable assembly;

3) Low temperature welding of the upper cavity wall and the lower cavity wall.

The wall thickness of the cavity formed after stretching in the step 1) is between 0.3 and 1.8 mm.

The step 1) is specifically:

11) stretching the metal material to form an upper cavity wall and a lower cavity wall, respectively;

12) further stretching the upper cavity wall to form a turn hole and an upper cavity forming hole;

13) Further stretching the lower cavity wall to form a projection and a lower cavity forming the hole.

The step 2) is specifically:

21) the raised and lower cavity forming holes are coated with a high melting point solder paste;

22) Place the resonant column at the protrusion, and place the joint cable assembly at the lower cavity forming hole for high temperature welding.

Compared with the prior art, the present invention has the following beneficial effects:

(1) The cavity wall is stretched and formed. Compared with the conventional machining and die casting, the manufacturing time is short and the processing waste is small, which greatly shortens the manufacturing cycle and saves the production time of the cavity filter.

(2) The upper cavity wall and the lower cavity wall are welded by a low melting point solder paste, which does not require screw fixing on the one hand, reduces assembly time, and on the other hand, because the solder paste has a low melting point, the upper cavity wall and the lower cavity are welded. When the body wall is used, it will not cause the welded parts to loosen.

(3) The upper cavity wall is provided with a turn hole connected with the tuning screw, and the lower cavity body wall is provided with the resonance column The protruding protrusions, the through holes and the protrusions are formed by stretching together with the cavity wall, further saving processing time and saving the cost of the cavity filter.

(4) The thickness of the cavity wall is between 0.3 and 1.8 mm. Compared with the existing cavity filter, the thickness is greatly reduced, which saves the cost on the one hand and reduces the weight of the filter on the other hand. The practicality of the filter.

(5) The resonant column and the joint cable assembly are welded to the cavity wall through the high melting point solder paste, which avoids the looseness during the final welding process, simplifies the filter manufacturing process and improves the filter production efficiency.

(6) When the depth of the cavity is deep, an intermediate cavity wall is added between the upper cavity wall and the lower cavity wall, and is connected to the upper and lower cavity walls through a flange. This way, the upper and lower cavity can be avoided. Damage caused by excessive stretching of the body, while meeting the depth requirements of the filter cavity.

(7) There is also a retaining wall between the resonant columns of the filter, which is connected with the welding positioning connecting hole on the wall of the cavity, and the retaining wall can control the radio frequency leakage of the product, thereby ensuring the intermodulation performance of the filter, and simultaneously welding and positioning. The holes ensure the accuracy and firmness of the weld.

(8) The depths of the cavities enclosed by the upper and lower cavity walls are equal, so that the joint faces of the upper and lower cavities are the middle positions of the total height of the filter, so that the overall RF energy is relatively low, and the intermodulation performance is The indicator has the least impact and improves the intermodulation performance of the filter.

DRAWINGS

1 is a schematic structural view of a conventional cavity filter, wherein (1a) is a cross-sectional view, and (1b) is a perspective view;

2 is a schematic structural view of a thin-walled stretching cavity filter;

Figure 3 is a schematic view showing the appearance of a thin-walled stretching cavity filter;

Figure 4 is a cross-sectional view of a thin wall drawing cavity filter;

5 is a schematic structural view of a lower cavity wall, wherein (5a) is a front view, (5b) is a top view, (5c) is a left view, and (5d) is a right view;

6 is a schematic structural view of an upper cavity wall, wherein (6a) is a front view, (6b) is a top view, (6c) is a left view, and (6d) is a right view;

Among them, 1 is the lower cavity wall, 2 is the upper cavity wall, 3 is the resonant column, 4 is the tuning screw, 5 is the connection The head cable assembly, 6 is a retaining wall, 7 is an intermediate cavity wall, and 8 is a welding positioning connecting hole.

detailed description

The invention will be described in detail below with reference to the drawings and specific embodiments. This embodiment is implemented on the premise of the technical solution of the present invention, and detailed implementation manners and specific operation procedures are given, but the scope of protection of the present invention is not limited to the following embodiments.

Figure 1 is a schematic view of the structure of a conventional cavity filter. As can be seen from the figure, the conventional cavity filter is machined or die-cast, resulting in a large thickness of the cavity wall and an enlarged cavity filter. The weight, and at the same time due to the wall thickness of the cavity, the entire cavity filter needs to be assembled by screws, and the assembly time is long while further increasing the quality of the entire cavity filter.

As shown in FIGS. 2 to 4, the thin-walled stretching cavity filter provided in the embodiment includes a cavity wall, a resonant column 3, a tuning screw 4, and a joint cable assembly 5, and the cavity wall is formed by stretching, and resonance The column 3 is located inside the cavity enclosed by the cavity wall, the tuning screw 4 is connected to the cavity wall, and the connector cable assembly 5 is located outside the cavity wall.

Wherein, the cavity wall comprises an upper cavity wall 2 and a lower cavity wall 1, the upper cavity wall 2 and the lower cavity wall 1 are welded by a low melting point solder paste, and the upper cavity wall 2 is connected with the tuning screw 4, the lower cavity The wall 1 is connected to the resonant column 3, and both the upper chamber wall 2 and the lower chamber wall 1 are connected to the joint cable assembly 5. As shown in FIG. 6 , the upper cavity wall 2 includes an upper cavity wall surface, an upper cavity flange surface and a through hole. The through hole is formed by stretching, and is located on the upper cavity wall surface and connected to the tuning screw 4 and the upper cavity. The upper flange surface is provided with an upper cavity forming hole groove connected to the joint cable assembly 5. As shown in FIG. 5, the lower cavity wall 1 includes a lower cavity wall surface, a lower cavity flange surface and a protrusion. The protrusion is formed by stretching, and is located on the lower cavity wall surface and connected to the resonance column 3, and the lower cavity. A lower cavity forming hole groove connected to the joint cable assembly 5 is provided on the body flange surface. When the stretching chamber is relatively deep (for example, when the stretching chamber exceeds 50 mm), the intermediate chamber wall 7 may be added between the upper chamber wall 2 and the lower chamber wall 1 and the upper and lower chamber walls 1 is connected by flanges. At the same time, a retaining wall 6 is arranged between the resonant columns 3, and a welding positioning connecting hole 8 can be added to the wall of the cavity. The retaining wall 6 is connected to the cavity wall through the welding positioning connecting hole 8. In this embodiment, a small waist type is added. Weld the positioning holes to ensure the accuracy and firmness of the welding. The cavity depth of the upper cavity wall 2 is equal to the cavity depth of the lower cavity wall 1, that is, the joint surface of the upper cavity wall 2 and the lower cavity wall 1 is the intermediate position of the filter, thereby ensuring the overall The RF energy is relatively low. The thickness of the above cavity wall is between 0.3 and 1.8 mm. And the resonant column 3 and the joint The cable assemblies 5 are all welded to the cavity walls by a high melting point solder paste. The connector cable assembly 5 includes a first connector cable and a second connector cable. In this embodiment, the first connector cable and the second connector cable are respectively located on the left and right sides of the outside of the cavity wall. According to the comprehensive consideration of physical properties and cost, the cavity wall can be a copper cavity wall, an aluminum cavity wall or a steel cavity wall. The thin-walled cavity formed by stretching in the present embodiment is not only suitable for a coaxial filter, but also suitable for a ceramic dielectric filter, and any other housing-type parts.

In the fabrication of the thin-walled stretching cavity filter, the cavity wall stretching is first required. The specific process is: selecting the material of the cavity wall according to cost and physical properties, and then designing the cavity of the cavity filter, The processing is convenient to divide the cavity wall into the upper cavity wall 2 and the lower cavity wall 1, and the flip hole is arranged on the upper cavity wall 2, and the lower cavity wall 1 is provided with a protrusion, and then stretched and cleaned. , complete the production of the cavity wall.

After the cavity wall is processed, the thin-wall cavity filter is welded, and the specific process is: applying a high-melting-point solder paste to the protrusion of the lower cavity wall 1 and the lower cavity molding hole, and the resonance column 3 Placed on the protrusion of the lower cavity wall 1, the joint cable assembly 5 is placed in the lower cavity forming hole groove, coated with high melting point solder paste, and then subjected to high temperature welding, and after electrical welding, electrical performance debugging; A low melting point solder paste is applied to the flange faces of the cavity wall 2 and the lower cavity wall 1, and a low melting point solder paste is also applied to the joint cable assembly 5 and the upper cavity forming hole groove, and the upper cavity wall 2 is applied. The lower cavity wall 1 is subjected to low-temperature welding, and the joint cable assembly 5 and the upper cavity forming hole are low-temperature welded and cleaned to complete the welding of the thin-walled cavity filter.

Claims

A thin-walled stretching cavity filter comprising a cavity wall, a resonant column, a tuning screw and a joint cable assembly, the cavity wall being formed by stretching, the resonant column being located at a cavity wall Inside the cavity, the tuning screw is coupled to a cavity wall that is external to the cavity wall.
The thin-walled stretching cavity filter according to claim 1, wherein the cavity wall comprises an upper cavity wall and a lower cavity wall, and the upper cavity wall and the lower cavity wall pass a low melting point The solder paste is soldered, the upper cavity wall is connected to a tuning screw, and the lower cavity wall is connected to the resonant column, and the upper cavity wall and the lower cavity wall are connected to the joint cable assembly.
The thin-walled stretching cavity filter according to claim 2, wherein the upper cavity wall comprises an upper cavity wall surface, an upper cavity flange surface and a turn hole, and the through hole is formed by stretching The upper cavity wall surface is connected to the tuning screw, and the upper cavity flange surface is provided with an upper cavity forming hole groove connected to the joint cable assembly.
The thin-walled stretching cavity filter according to claim 2, wherein the lower cavity wall comprises a lower cavity wall surface, a lower cavity flange surface and a protrusion, and the protrusion is formed by stretching The lower cavity wall surface is connected to the resonant column, and the lower cavity flange surface is provided with a lower cavity forming hole groove connected to the joint cable assembly.
The thin-walled stretching cavity filter according to claim 2, wherein an intermediate cavity wall is further disposed between the upper cavity wall and the lower cavity wall, and the intermediate cavity wall respectively passes the method The blue is connected to the upper and lower chamber walls.
The thin wall drawing cavity filter according to claim 1, wherein the upper cavity wall has a cavity depth equal to a cavity depth of the lower cavity wall.
The thin wall drawing cavity filter according to claim 1, wherein the cavity wall has a thickness of between 0.3 and 1.8 mm.
The thin wall drawing cavity filter of claim 1 wherein said resonant column and joint cable assembly are both welded to the cavity wall by a high melting point solder paste.
The thin-walled drawing cavity filter according to claim 1, wherein a retaining wall is further disposed between the resonant columns, and the retaining wall is connected to the cavity wall.
A thin wall drawing cavity filter according to claim 9, wherein said cavity The wall is further provided with a welding positioning connecting hole, and the welding positioning connecting hole is connected with the retaining wall.
A method of fabricating a thin wall drawing cavity filter according to claim 1, wherein the method comprises the steps of:

1) stretching the metal material to form a cavity wall, the cavity wall including an upper cavity wall and a lower cavity wall;

2) high temperature welding of the cavity wall with the resonant column and the joint cable assembly;

3) Low temperature welding of the upper cavity wall and the lower cavity wall.
The method for fabricating a thin-walled stretching cavity filter according to claim 11, wherein the wall thickness of the cavity formed after the stretching in the step 1) is between 0.3 and 1.8 mm.
The method of manufacturing a thin-walled tensile cavity filter according to claim 11, wherein the step 1) is specifically:

11) stretching the metal material to form an upper cavity wall and a lower cavity wall, respectively;

12) further stretching the upper cavity wall to form a turn hole and an upper cavity forming hole;

13) Further stretching the lower cavity wall to form a projection and a lower cavity forming the hole.
The method of manufacturing a thin-walled tensile cavity filter according to claim 11, wherein the step 2) is specifically:

21) the raised and lower cavity forming holes are coated with a high melting point solder paste;

22) Place the resonant column at the protrusion, and place the joint cable assembly at the lower cavity forming hole for high temperature welding.