WO2019213913A1 - Cavity filter, filter cavity, and manufacturing method therefor - Google Patents

Abstract

A cavity filter, a filter cavity, and a manufacturing method therefor. The manufacturing method for the filter cavity comprises: providing a workpiece to be processed and a metal block (S101); performing first groove milling processing on a surface of the workpiece to form a groove (S102); inserting the metal block into the groove, an interval being present between a bottom portion of the metal block and a bottom wall of the groove, the interval being used to form a first signal channel (S103); processing the workpiece to fabricate a filter cavity (S104). In the process of forming the first signal channel on a cavity side wall or isolation rib, the described method may effectively prevent damage to other structures at the interior of the filter cavity, and the sides of the formed first signal channel are flat and smooth.

Description

Cavity filter, filter cavity and preparation method thereof

[Technical Field]

The present invention relates to the field of radio frequency technologies, and in particular, to a cavity filter, a filter cavity, and a method of fabricating the same.

 【Background technique】

The cavity filter is widely used in the field of communications as a frequency selection device, especially in the field of radio frequency communication. In the base station, a filter is used to select a communication signal to filter out clutter or interference signals outside the frequency of the communication signal.

When there is a stagger between the channel and the channel in the cavity filter, the T-blade is usually used to machine the channel through the sidewall of the cavity or the spacer.

In the long-term research and development process, the inventor of the present application found that when the side surface of the side wall of the cavity or the side of the isolation rib penetrates the opening passage, the passage is opened on the isolation rib. For example, please refer to FIG. 2. It is necessary to use a T-shaped cutter 300 having a large disk diameter. However, during the machining process, the fixing portion 312 or the mounting table 313 inside the filter cavity is milled in the process of milling the passage 311 on the isolation rib 310, and the like. On the one hand, referring to FIG. 3, the channel 311, which is milled in the direction in which the T-shaped cutter 300 is approached from the side of the cavity or the spacer rib 310, has a sharp edge 314, which is disadvantageous for removing the burr.

 [Summary of the Invention]

The invention provides a cavity filter, a filter cavity and a preparation method thereof, so as to solve the technical problem that the internal structure of the cavity is milled out and the sharp edge is easily formed in the channel during the processing of the T-knife in the prior art.

In order to solve the above technical problem, a technical solution adopted by the present invention is to provide a method for preparing a filter cavity, including:

Providing workpieces and metal blocks to be processed;

Performing a first milling process on the surface of the workpiece to form a groove;

Inserting the metal block into the groove, a gap between a bottom of the metal block and a bottom wall of the groove, the space for forming a first signal path;

The workpiece is processed to form the filter cavity.

According to an embodiment of the invention, the filter cavity includes a cavity bottom wall, a cavity sidewall, an isolation rib separating the filter cavity interior into a plurality of resonant cavities, a metal member, and a first signal path. The first signal path penetrates the sidewall of the cavity or/and the isolation rib; the first signal path is obtained by processing the interval, and the metal piece is made of the metal block Processed.

According to an embodiment of the invention, the step of processing the workpiece includes:

The workpiece is subjected to a second milling process to form a second signal path, the second signal path being formed on a top surface of the sidewall of the cavity or/and a top surface of the spacer.

According to an embodiment of the invention, the second signal channel is disposed apart from the first signal channel.

According to an embodiment of the invention, the second signal channel and the first signal channel are separated by the metal member.

According to an embodiment of the invention, the filter cavity is further configured to:

a fixing portion disposed on both sides of the top surface of the spacer rib for receiving a locking member for fixedly connecting the top cover of the cavity filter and the filter cavity;

A mounting platform is disposed on the bottom wall of the cavity of the filter cavity for mounting a resonant rod.

According to an embodiment of the invention, the surface shape of the groove is a "ten" shape, and a position of the middle portion is a circle.

According to an embodiment of the invention, the shape of the first signal path is quadrilateral, circular or elliptical.

According to an embodiment of the invention, the material of the workpiece is aluminum or copper, and the material of the metal member is aluminum, copper or iron.

In order to solve the above technical problem, another technical solution adopted by the present invention is to provide a filter cavity, including:

a bottom wall of the cavity, a sidewall of the cavity, an isolation rib separating the interior of the filter cavity into a plurality of resonant cavities, a metal member, a first signal channel, and a second signal channel, wherein the metal member is disposed in the cavity a top of the body sidewall or/and a top of the spacer rib, the first signal path extending through the cavity sidewall or/and the spacer rib, the second signal channel being disposed on the sidewall of the cavity The top surface or/and the top surface of the spacer rib, the first signal path and the second signal path are separated by the metal member.

In order to solve the above technical problem, another technical solution adopted by the present invention is to provide a cavity filter including a filter cavity and a top cover, the top cover being capped on the filter cavity, The filter cavity includes:

a bottom wall of the cavity, a sidewall of the cavity, an isolation rib separating the interior of the filter cavity into a plurality of resonant cavities, a metal member, a first signal channel, and a second signal channel, wherein the metal member is disposed in the cavity a top of the body sidewall or/and a top of the spacer rib, the first signal path extending through the cavity sidewall or/and the spacer rib, the second signal channel being disposed on the sidewall of the cavity The top surface or/and the top surface of the spacer rib, the first signal path and the second signal path are separated by the metal member.

Different from the prior art, in the method for preparing the filter cavity provided by the present invention, the groove is first milled in the workpiece, and then the metal block is inserted into the groove, and the bottom of the metal block and the bottom wall of the groove are Having a spacing for forming a first signal path, and then processing other structures of the filter cavity. Compared with the conventional method, the structure of the filter cavity is first processed and then processed by a T-knife. Signal channel, the technical solution of the present application can effectively avoid damage to other structures inside the filter cavity during the process of forming the first signal channel of the sidewall or the isolation rib, and the side of the formed first signal channel Flat and smooth, in addition, the metal member is fixedly disposed at the first signal path away from the bottom wall of the cavity, and can fill the top surface structure of the cavity sidewall damaged by the milling cutter groove or/and the top surface structure of the isolation rib, so that The top surface structure of the sidewall of the cavity or/and the top surface structure of the spacer is not affected by the opening of the first signal path for setting other structures to make full use of space and improve space utilization.

 [Description of the Drawings]

In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings used in the description of the embodiments will be briefly described below. It is obvious that the drawings in the following description are only some embodiments of the present invention. For those skilled in the art, other drawings may be obtained according to these drawings without any creative work, wherein:

1 is a schematic view showing a state in a manufacturing process of a filter cavity in the prior art;

2 is a schematic view showing another state in the manufacturing process of the filter cavity in the prior art;

3 is a partial structural schematic view of an embodiment of a filter cavity in the prior art;

4 is a schematic flow chart of an embodiment of a method for preparing a filter cavity of the present invention;

Figure 5 is a schematic structural view of the workpiece and the metal block provided in step S101 of Figure 4;

Figure 6 is a schematic structural view of the workpiece after step S102 in Figure 4;

Figure 7 is a schematic structural view of the workpiece after step S103 in Figure 4;

Figure 8 is a schematic structural view of the workpiece after step S104 in Figure 4;

9 is a partial structural schematic view of an embodiment of a filter cavity of the present invention;

10 is a partial structural schematic view of another embodiment of a filter cavity of the present invention;

Figure 11 is a block diagram showing an embodiment of a cavity filter of the present invention.

【detailed description】

The technical solutions in the embodiments of the present invention are clearly and completely described in the following with reference to the accompanying drawings in the embodiments of the present invention. It is obvious that the described embodiments are only a part of the embodiments of the present invention, but not all embodiments. All other embodiments obtained by a person of ordinary skill in the art based on the embodiments of the present invention without creative efforts are within the scope of the present invention.

Referring to FIG. 4, a method for preparing a filter cavity 10 according to an embodiment of the present invention includes:

Step S101, please refer to FIG. 5, to provide a workpiece 200 and a metal block 210 to be processed.

The material of the workpiece 200 may be a metal material, such as aluminum, copper, etc. In the present embodiment, the material of the workpiece 200 is aluminum; the metal block 210 may be made of a metal material, such as aluminum, copper or iron, in this embodiment. The metal block 210 is aluminum; the metal block 210 may be cylindrical. Of course, in other embodiments, the material of the workpiece 200, the material and shape of the metal block 210 can be adaptively adjusted according to requirements, which is not limited herein.

In step S102, please refer to FIG. 6 to perform the first milling process on the surface of the workpiece 200 to form the groove 230.

Among them, the milling cutter of the first milling slot can be an ordinary milling cutter. In the present embodiment, the surface shape of the groove 230 is a "ten" shape, and the position of the middle portion is circular. Of course, in other embodiments, the shape of the groove 230 may be other shapes, such as a "one" shape, a "T" shape, etc., which are not limited herein.

Step S103, please refer to FIG. 7, inserting the metal block 210 into the groove 230, and the bottom of the metal block 210 and the bottom wall of the groove 230 have a space for forming the first signal path.

In the present embodiment, the metal block 210 is inserted at a substantially central position of the recess 230. It can be understood that the depth of the metal block 210 inserted into the groove 230 is smaller than the depth of the groove 230, so that the metal block 210 and the bottom wall of the groove 230 are spaced apart to facilitate forming a first signal path in a subsequent step. The shape of the signal channel is quadrilateral, circular or elliptical.

In step S104, referring to FIG. 8, the workpiece 200 is processed to form the filter cavity 10.

Optionally, the fabricated filter cavity 10 includes a cavity bottom wall 11, a cavity sidewall 12, an isolation rib 13 that isolates the interior of the filter cavity 10 into a plurality of resonant cavities, a metal member 14, and a first signal. The first signal channel 15 is opened on the side of the sidewall 12 of the cavity or/and the side of the spacer rib 13. After the metal block 210 is processed, the metal member 14 is formed, and the metal member 14 is fixedly disposed on the first signal channel 15 away from the cavity. At the body bottom wall 11, the metal block 210 is processed to form a metal member 14.

Optionally, the prepared filter cavity 10 may further include a mounting base 16 and a fixing portion 17, wherein the mounting base 16 is disposed on the cavity bottom wall 11 of the filter cavity 10 for mounting the resonant rod (not As shown, the fixing portion 17 is disposed on both sides of the top surface of the spacer rib 13 for receiving a locking member (not shown) for fixing the top cover of the cavity filter and the filter cavity 10.

It can be understood that, in the embodiment of the present invention, the groove 230 is first milled in the workpiece 200, and then the metal block 210 is inserted into the groove 230. The bottom of the metal block 210 and the bottom wall of the groove 230 are spaced apart. For forming the first signal channel 15, and processing other structures of the filter cavity 10, the first signal channel is processed by the T-shaped blade after the structures of the filter cavity 10 are processed in the conventional manner. The technical solution of the present application can effectively avoid damage to other structures inside the filter cavity 10 during the process of forming the first signal path 15 by the cavity sidewall 12 or the isolation rib 13 , and the formed first signal channel 15 The side of the flat member is flat and smooth. In addition, the metal member 14 is fixedly disposed at the first signal path 15 away from the bottom wall 11 of the cavity, and can fill the top surface structure of the cavity sidewall 12 damaged when the milling groove 230 is milled. The top surface structure of the isolation ribs 13 is such that the top surface structure of the cavity sidewalls 12 and/or the top surface structure of the isolation ribs 13 are not affected by the opening of the first signal path 15, so as to be used for other structures to make full use of Space, improve space utilization.

In an embodiment, the step of processing the workpiece 200 includes:

A second milling process is performed on the workpiece 200 to form a second signal path 18 that is formed on the top surface of the sidewall 12 of the cavity or/and the top surface of the spacer rib 13.

Optionally, the second signal channel 18 is disposed in isolation from the first signal channel 15 to avoid mutual interference between the first signal channel 15 and the second signal channel 18.

It can be understood that, after processing, the first signal path 15 is formed through the side of the cavity sidewall 12 or/and the side of the spacer rib 13 , and the metal member 14 is disposed at the first signal path 15 away from the cavity bottom wall 11 , and The two signal channels 18 are formed on the top surface of the sidewall 12 of the cavity or/and the top surface of the spacer rib 13 , and the first signal channel 15 and the second signal channel 18 are separated from each other by the action of the metal member 14 , thereby The transmission of signals between the two is not disturbed.

Different from the prior art, in the method for preparing the filter cavity provided by the embodiment of the present invention, the groove 230 is first milled in the workpiece 200, and then the metal block 210 is inserted into the groove 230, and the bottom of the metal block 210 is There is a space between the bottom walls of the grooves 230 for forming the first signal path 15, and then processing other structures of the filter cavity 10, which are the structures of the filter cavity 10 in the conventional manner. After the processing is completed, the first signal path is processed by the T-shaped blade. The technical solution of the present application can effectively avoid other internals of the filter cavity 10 during the process of forming the first signal path 15 by the sidewall 12 of the cavity or the isolation rib 13 The structure causes damage, and the side of the formed first signal path 15 is smooth and flat. In addition, the metal member 14 is fixedly disposed at the first signal path 15 away from the bottom wall 11 of the cavity, and can be broken when the milling cutter groove 230 is filled. The top surface structure of the cavity sidewall 12 or/and the top surface structure of the spacer rib 13 is such that the top surface structure of the cavity sidewall 12 or/and the top surface structure of the spacer rib 13 are not open to the first signal path 15 Influence for setting the second signal path 18 to charge Use space to improve space utilization. In addition, due to the action of the metal member 14, the first signal channel 15 and the second signal channel 18 are isolated from each other, so that the transmission of signals between the two is not disturbed.

Referring to FIG. 9, the present application further provides a filter cavity 10 including a cavity bottom wall 11, a cavity sidewall 12, and an isolation of the filter cavity 10 into a plurality of resonant cavities. a rib 13, a metal member 14, a first signal path 15 and a second signal path 18, the metal member 14 is disposed at the top of the cavity sidewall 12 or/and the top of the spacer rib 13, and the first signal path 15 extends through the sidewall of the cavity 12 or / and spacer ribs 13, the second signal path 18 is disposed on the top surface of the cavity sidewall 12 or / and the top surface of the spacer rib 13, the first signal path 15 and the second signal path 18 are separated by the metal member 14, Thereby, signals between the first signal path 15 and the second signal path 18 are prevented from interfering with each other.

The filter cavity 10 may further include a mounting table 16 and a fixing portion 17, wherein the mounting table 16 is fixedly disposed on the cavity bottom wall 11; the fixing portion 17 is disposed on both sides of the top surface of the spacer rib 13.

The mounting table 16 is for mounting a resonant rod (not shown). The mounting table 16 may be fixed to the cavity bottom wall 11 or may be integrally formed with the cavity bottom wall 11. In the present embodiment, the mounting table 16 is integrally formed with the cavity bottom wall 11.

The fixing portion 17 is for receiving a locking member (not shown) for fixedly connecting the top cover of the cavity filter to the filter cavity 10.

In the present embodiment, the fixing portion 17 is integrally formed with the spacer ribs 13.

It can be understood that the region where the first signal path 15 is located communicates with the region where the metal member 14 is located as a groove, and the metal member 14 is disposed at the opening of the groove to fill the cavity damaged when the first signal path 15 is processed. The top surface structure of the side wall 12 or/and the top surface structure of the spacer rib 13 is such that a second signal path 18 can also be formed on the top surface of the cavity sidewall 12 or/and the top surface of the spacer rib 13 and A signal path 15 is isolated from the second signal path 18.

It can be understood that the first signal channel 15 and the second signal channel 18 are used to place a signal connection line in the cavity filter 100, and the signal connection line can be a tap line or a signal output line. Specifically, when the first signal path 15 is opened on the side of the isolation rib 13 and the second signal path 18 is opened on the top surface of the isolation rib 13 , signal transmission between the two resonant cavities on both sides of the isolation rib 13 can be realized; When the first signal path 15 is opened on the side of the cavity sidewall 12 and the second signal path 18 is opened on the top surface of the cavity sidewall 12, signal transmission between the cavity and the connector (not shown) can be realized. . Of course, when the first signal path 15 is opened on the side of the isolation rib 13 and the second signal path 18 is opened on the top surface of the isolation rib 13 , no connection line may be placed in the first signal path 15 and the second signal path 18 . The transmission of signals is achieved by means of coupling. In this embodiment, the first signal path 15 is formed through the side surface of the spacer rib 13 , and the second signal path 18 is opened on the top surface of the spacer rib 13 .

Of course, in another embodiment, referring to FIG. 10, in the filter cavity 10, the side surface of the cavity sidewall 12 or/and the side of the spacer rib 13 are provided with a first signal path 15, the sidewall of the cavity The top surface of the 12 or/and the top surface of the spacer 13 is not provided with a second signal path 18, of course, the top surface of the cavity sidewall 12 or/and the top surface of the spacer 13 can be used to provide other structures, This is not limited. It can be understood that because the metal member 14 is fixed at the bottom of the first signal channel 15 away from the cavity bottom wall 11, the top surface structure of the cavity sidewall 12 and/or the top surface structure of the spacer rib 13 are not subject to the first signal. With the influence of channel 15, other structures can be set to make full use of space and improve space utilization.

The shape of the first signal channel 15 may be a quadrangle, a circle or an ellipse, wherein the quadrilateral may be a rectangle, a square, a trapezoid, a diamond or a trapezoid. In the present embodiment, the cross-sectional pattern of the first signal path 15 is a rectangle. The size and the cross-sectional shape of the first signal channel 15 can be adjusted accordingly according to requirements, which is not limited herein.

The cavity bottom wall 11, the cavity sidewall 12, the spacer rib 13, the mounting table 16, and the fixing portion 17 may be integrally formed, and the material is a metal material, for example, aluminum, copper, or the like. The metal member 14 may be made of a metal material such as aluminum, copper or iron. In the present embodiment, the metal member 14 is aluminum.

It can be understood that the filter cavity 10 of each of the above embodiments can be prepared by the above method for preparing the filter cavity.

Different from the prior art, the side of the first signal path 15 formed by the filter cavity 10 provided by the embodiment of the present invention is smooth and flat, and the metal member 14 is fixedly disposed on the first signal channel 15 away from the bottom wall 11 of the cavity. The top surface structure of the cavity sidewall 12 damaged by the preparation process and/or the top surface structure of the barrier rib 13 can be filled so that the top surface structure of the cavity sidewall 12 or/and the top surface structure of the isolation rib 13 are not It is affected by opening the first signal channel 15 for setting the second signal channel 18 to make full use of space and improve space utilization. In addition, due to the action of the metal member 14, the first signal channel 15 and the second signal channel 18 are isolated from each other, so that the transmission of signals between the two is not disturbed.

Referring to FIG. 11 , the cavity filter 100 provided by the embodiment of the present invention includes a filter cavity 10 and a top cover 30 for covering the filter cavity 10 .

It can be understood that the filter cavity 10 is the filter cavity described above, and details are not described herein again.

Referring to FIG. 9 and FIG. 11 again, the top cover 30 is provided with a plurality of threaded holes 31. The top surface of the fixing portion 17 of the filter cavity 10 is provided with a plurality of matching holes 171, and a plurality of threaded holes 31 and The matching holes 171 are aligned one by one, and the locking members are screwed into the screw holes 31 and the fitting holes 171 from the surface of the top cover 30 away from the fixing portion 17, so that the top cover 30 is sealed on the filter cavity 10. Wherein, the locking member may be a stud.

Different from the prior art, the side of the first signal channel 15 formed by the filter cavity 10 in the cavity filter 100 provided by the embodiment of the present invention is smooth and smooth, and the metal member 14 is fixedly disposed on the first signal channel. 15 away from the bottom wall 11 of the cavity, capable of filling the top surface structure of the cavity sidewall 12 or/and the top surface structure of the barrier rib 13 during the preparation process, so that the top surface structure or/and isolation of the cavity sidewall 12 The top surface structure of the rib 13 is not affected by the opening of the first signal path 15 for setting the second signal path 18 to make full use of space and improve space utilization. In addition, due to the action of the metal member 14, the first signal channel 15 and the second signal channel 18 are isolated from each other, so that the transmission of signals between the two is not disturbed.

The above is only the embodiment of the present invention, and is not intended to limit the scope of the invention, and the equivalent structure or equivalent process transformation of the specification and the drawings of the present invention may be directly or indirectly applied to other related technical fields. The same is included in the scope of patent protection of the present invention.

Claims (11)

1. A method for preparing a filter cavity, comprising:

   Providing workpieces and metal blocks to be processed;

   Performing a first milling process on the surface of the workpiece to form a groove;

   Inserting the metal block into the groove, a gap between a bottom of the metal block and a bottom wall of the groove, the space for forming a first signal path;

   The workpiece is processed to form the filter cavity.
2. The preparation method according to claim 1, wherein the filter cavity comprises a cavity bottom wall, a cavity sidewall, an isolation rib separating the filter cavity inside into a plurality of resonant cavities, and a metal And a first signal path extending through the sidewall of the cavity or/and the isolation rib; the first signal path is obtained by processing the interval, the metal piece It is obtained by processing the metal block.
3. The preparation method according to claim 2, wherein the step of processing the workpiece comprises:

   The workpiece is subjected to a second milling process to form a second signal path, the second signal path being formed on a top surface of the sidewall of the cavity or/and a top surface of the spacer.
4. The method according to claim 3, wherein the second signal path is disposed apart from the first signal path.
5. The method according to claim 4, wherein the second signal path and the first signal path are separated by the metal member.
6. The method according to claim 2, wherein the filter cavity is further comprised of:

   a fixing portion disposed on both sides of the top surface of the spacer rib for receiving a locking member for fixedly connecting the top cover of the cavity filter and the filter cavity;

   A mounting platform is disposed on the bottom wall of the cavity of the filter cavity for mounting a resonant rod.
7. The preparation method according to claim 1, wherein the surface shape of the groove is a "ten" shape, and a position of the middle portion is a circle.
8. The preparation method according to claim 1, wherein the shape of the first signal path is a quadrangle, a circle or an ellipse.
9. The preparation method according to claim 1, wherein the material of the workpiece is aluminum or copper, and the material of the metal member is aluminum, copper or iron.
10. A filter cavity, comprising:

    a bottom wall of the cavity, a sidewall of the cavity, an isolation rib separating the interior of the filter cavity into a plurality of resonant cavities, a metal member, a first signal channel, and a second signal channel, wherein the metal member is disposed in the cavity a top of the body sidewall or/and a top of the spacer rib, the first signal path extending through the cavity sidewall or/and the spacer rib, the second signal channel being disposed on the sidewall of the cavity The top surface or/and the top surface of the spacer rib, the first signal path and the second signal path are separated by the metal member.
11. A cavity filter includes a filter cavity and a top cover, the top cover being capped on the filter cavity, wherein the filter cavity comprises:

    a bottom wall of the cavity, a sidewall of the cavity, an isolation rib separating the interior of the filter cavity into a plurality of resonant cavities, a metal member, a first signal channel, and a second signal channel, wherein the metal member is disposed in the cavity a top of the body sidewall or/and a top of the spacer rib, the first signal path extending through the cavity sidewall or/and the spacer rib, the second signal channel being disposed on the sidewall of the cavity The top surface or/and the top surface of the spacer rib, the first signal path and the second signal path are separated by the metal member.