A high-isolation three-cavity curved waveguide

Abstract

The present invention discloses a high-isolation three-cavity curved waveguide tube, comprising a waveguide wall, a waveguide cavity, a first flange, a second flange, a plug, a flange mounting hole, a positioning hole, and a positioning pin; three rectangular waveguide cavities are provided in the waveguide wall 1, and the waveguide cavity is "L"-shaped; the first flange and the second flange are respectively provided at the ports of the waveguide cavity and connected to the waveguide wall. The first flange and the second flange are rectangular, and a flange mounting hole is provided at each of the four corners of the rectangle; the first flange and the second flange each have three waveguide cavities of the same size, a positioning hole is provided on each side of the long side of the waveguide cavity, and a positioning pin is provided between the two waveguide cavities. The plug is provided at the rectangular step through hole of the waveguide cavity. The present invention integrates the three waveguide cavities into one waveguide wall, and each end of the waveguide cavity shares a flange, which reduces the area occupied by the waveguide tube and reduces the weight of the product; the present invention solves the problems of carbon deposits during processing, low isolation, and poor radio frequency performance of "L"-shaped waveguide tubes with small and deep waveguide cavities.

Description

Technical Field ,

[0005]

[0001] The present invention relates to the field of converters, and particularly to a three-cavity bent waveguide with high isolation. Background Art

[0002] Since a waveguide can confine energy in a hollow metal tube and the energy can only propagate within the waveguide cavity without spreading elsewhere, unlike an antenna that directly radiates energy into the entire space, this can greatly reduce the loss during energy transmission, so it has been widely used.

[0003] With the development of miniaturization and modularization of the whole machine equipment, the market demand for miniaturization and integration of waveguides is increasing. Since flanges for connecting to other waveguides are generally provided at both ends of the waveguide, in addition to the waveguide cavity and flange connection holes on the flange, positioning pins or positioning holes for conveniently aligning the two connected waveguide cavities are also provided, which limits the miniaturization of the waveguide.

[0004] Since the dimensional accuracy and surface finish of the waveguide cavity have a great influence on the performance of the waveguide, for a straight waveguide, because the waveguide cavity is a through hole, it is very easy to process by slow wire electrical discharge machining. For a bent waveguide, since the waveguide cavity is a blind hole, generally electrical discharge machining by a spark machine is used. For a waveguide with a small and deep waveguide cavity, due to poor slag discharge during the discharge process of the electrode, surface carbon deposition is very likely to occur, affecting the surface treatment of the product, and the electrical discharge machining by the spark machine.

[0005] takes a long time and the processing cost is extremely high, resulting in a sharp rise in the product cost, causing great difficulties in the market promotion of such waveguides. Currently, in the market, the rectangular waveguide is usually divided into two parts, one part of the waveguide cavity is processed into a "U" - shaped open form, and the other part is processed into a cover form, and then the cover is connected to the waveguide cavity part to form the whole rectangular waveguide. Although this method can solve the slag discharge problem of the original deep blind hole processing, it introduces a connection problem between the cover and the waveguide cavity. For example, the way of fastening connection by screws will cause relatively large signal leakage and poor isolation of the product. For example, by welding, for a relatively deep waveguide cavity, its cover is relatively long, the welding length is correspondingly long, the welding area is large, and it is very easy to have false welding phenomena, and solder cracking is likely to occur in a vibration and shock environment, and the isolation and reliability of the product will be greatly affected. Under this background, it is urgent to solve the problems of miniaturization and high isolation of the "L" waveguide. [[ID=​​​​​​​

[0008] A high-isolation three-cavity curved waveguide comprises a waveguide wall, a waveguide cavity, a first flange, a second flange, a plug, a flange mounting hole, a positioning hole, and a positioning pin. The waveguide wall is provided with three L-shaped waveguide cavities. The first and second flanges are respectively provided at the ports of the waveguide cavities and connected to the waveguide wall. The first and second flanges are rectangular, with a flange mounting hole provided at each of the four corners of the rectangle. The first and second flanges each have three waveguide cavities of identical size, a positioning hole provided on each side of the long side of the waveguide cavity, a positioning pin 8 provided between the two waveguide cavities, and the plug 5 provided at the rectangular stepped through-hole of the waveguide cavity.

[0009] Preferably, the middle waveguide cavity and the waveguide cavities on both sides share a waveguide wall, and the waveguide wall is made of a lighter aluminum alloy material.

[0010] Preferably, the waveguide cavity is three rectangular cavities processed in a metal shell, and is a small and deep "L"-shaped curved waveguide cavity.

[0011] Preferably: the long side of the waveguide cavity is parallel to the long sides of the first flange and the second flange; a positioning hole is provided on each side of the long side of the waveguide cavity, which is used for inserting the positioning pin at the matching end when the three waveguide cavities are connected to the waveguide cavity at the other end of the matching end, so as to achieve the effect of quickly aligning the waveguide cavities to be connected at both ends; a positioning pin is provided in the middle of the three rectangular waveguide cavities on the first flange and the second flange respectively, which is used for inserting into the positioning hole at the matching end, so as to also achieve the effect of quickly aligning the waveguide cavities to be connected at both ends, and by processing the three waveguide cavities in a metal waveguide wall, sharing the waveguide tube of the first flange and the second flange, and processing the flange mounting holes only at the four corners of the first flange and the second flange, the mounting holes of the two waveguide cavity flanges are reduced.

[0012] Preferably: the "L"-shaped rectangular waveguide cavity is processed into a rectangular through hole at the deeper end of the cavity, and is processed into a rectangular step through hole at the shallower end of the cavity. The size of one end of the step hole is larger than the size of the waveguide cavity. A plug is pressed into one end of the step hole, and the size of the plug matches the size of the step hole, that is, the cavity size at the plug is smaller than the waveguide cavity. The plug is welded to the waveguide wall by aluminum brazing, and the plug after aluminum brazing is subjected to secondary processing to remove the part of the plug protruding from the waveguide cavity, so that the cavity at the plug and the waveguide cavity are located on the same plane.

[0013] Compared with the prior art, the present invention has the following advantages: It integrates three waveguide cavities into a single housing, with the middle waveguide cavity and the two side waveguide cavities sharing a waveguide wall, and each end of the cavity sharing a flange. This reduces the volume and weight compared to a single waveguide tube. By processing the blind hole of the "L"-shaped rectangular waveguide cavity into a through hole and then brazing the plug with aluminum, the present invention changes the processing method from the original blind hole spark machine discharge etching to slow-flow wire cutting. This avoids the carbon deposit phenomenon that occurs when processing small and deep blind holes with spark machines, greatly reduces the processing time, significantly improves the processing efficiency, and sharply reduces the product cost. The aluminum brazing plug of the present invention is smaller, and the welding area is greatly reduced compared to the welded "lid". Testing has shown that no cold welding has occurred, and the waveguide isolation is basically the same as that of the integrated processing. The aluminum-brazed plug of the present invention is slightly larger than the size of the waveguide cavity. After aluminum brazing, secondary processing is performed to make the cavity at the aluminum brazing area and the cavity at the non-aluminum brazing area be on the same plane, thereby reducing the influence of the waveguide RF electrical performance caused by the waveguide cavity not being on the same plane due to the accumulation of machining dimensional tolerances. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 Schematic diagram of the waveguide cavity processing of the present invention.

[0015] Figure 2 Schematic diagram of the aluminum brazing plug of the present invention.

[0016] Figure 3 This is a schematic diagram of the waveguide cavity after the plug is processed.

[0017] Figure 4 Schematic diagram of the flange of the present invention.

[0018] Figure 5 This is a schematic diagram of three traditional waveguide flanges arranged side by side.

[0019] In the figure: rectangular through hole at A, rectangular stepped through hole at B, aluminum brazing at C; 1- waveguide wall; 2- waveguide cavity; 3- first flange; 4- second flange; 5- plug; 6- flange mounting hole; 7- positioning hole; 8- positioning pin. DETAILED DESCRIPTION

[0020] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0021] As shown in the figure, a high-isolation three-cavity curved waveguide comprises a waveguide wall 1, a waveguide cavity 2, a first flange 3, a second flange 4, a plug 5, a flange mounting hole 6, a positioning hole 7, and a positioning pin 8. Three rectangular waveguide cavities 2 are disposed in the waveguide wall 1, and the waveguide cavities 2 are L-shaped. The first and second flanges 3 and 4 are respectively located at the ends of the waveguide cavities 2 and connected to the waveguide wall 1. The first and second flanges 3 and 4 are rectangular, with a flange mounting hole 6 provided at each of the four corners of the rectangle. Each of the first and second flanges 3 and 4 has three waveguide cavities 2 of equal size, with a positioning hole 7 provided on either side of the long side of each waveguide cavity. A positioning pin 8 is provided between two waveguide cavities 2. The plug 5 is located at the rectangular stepped through-hole B of the waveguide cavity 2.

[0022] The central waveguide cavity 2 shares a waveguide wall 1 with the two adjacent waveguide cavities 2. This wall 1 is constructed of a lightweight aluminum alloy, contributing to the product's lightweight design. The waveguide cavity 2 comprises three rectangular cavities 2, each small and deep, L-shaped and curved, within a metal housing.

[0023] Three rectangular waveguide cavities 2 are provided on each of the first and second flanges 3 and 4, with their long sides parallel to those of the first and second flanges 3 and 4, respectively. A positioning hole 7 is provided on each side of the long side of each waveguide cavity 2 for inserting a positioning pin at the mating end when the three waveguide cavities 2 are connected to a matching waveguide cavity, thereby quickly aligning the two waveguide cavities to be connected. A positioning pin 8 is provided in the middle of each of the three rectangular waveguide cavities 2 on each of the first and second flanges 3 and 4, for inserting into the positioning hole 7 at the mating end, similarly aligning the two waveguide cavities to be connected. By fabricating the three waveguide cavities 2 within a single metal waveguide wall 1, sharing the waveguide tubes of the first and second flanges 3 and 4, and only fabricating flange mounting holes 6 at the four corners of the first and second flanges 3 and 4, the number of mounting holes required for the two waveguide cavity flanges is reduced. Consequently, the flange area is significantly reduced compared to the area of ​​three waveguide flanges placed side by side, thereby reducing the product's footprint and weight.

[0024] The L-shaped rectangular waveguide cavity 2 is machined into a rectangular through-hole at the deeper end, as shown at A, and a rectangular stepped through-hole at the shallower end, as shown at B. The dimensions of one end of the stepped hole are larger than those of the waveguide cavity. A plug 5 is pressed into the stepped hole from one end, and the dimensions of the plug 5 match those of the stepped hole B, meaning that the cavity dimensions at the plug 5 are smaller than those of the waveguide cavity 2. The plug 5 is then brazed to the waveguide wall 1 at C via aluminum brazing. The brazed plug undergoes secondary machining to remove the portion of the plug protruding from the waveguide cavity 2, aligning the cavity at the plug 5 with the waveguide cavity 2. This approach reduces the impact on the waveguide's RF electrical performance caused by the accumulated machining dimensional tolerances when the plug is directly machined into place, resulting in the cavity at the plug 5 not being aligned with the waveguide cavity at the unplugged location. Because the waveguide cavity 2 has been converted from a blind hole to a through hole, it can be machined using wire-cut machining. This significantly reduces machining time compared to blind hole machining using a spark erosion machine, and prevents slag removal problems. This significantly improves machining efficiency and reduces costs, thereby lowering product costs. Because the plug 5 only seals the portion of the waveguide cavity 2 that extends beyond the "L" shape, its weld area is significantly reduced compared to the "lid" of the entire waveguide cavity 2. By controlling the welding process parameters, solder joint inspection using microfocus X-ray fluoroscopy equipment has shown no signs of cold welds. Furthermore, the isolation of the waveguide after aluminum brazing is comparable to that of an integrated process, while reducing machining costs by 2-3 times.

[0025] The above is a preferred embodiment of the present invention. For ordinary technicians in this field, based on the teachings of the present invention, without departing from the principles and spirit of the present invention, changes, modifications, substitutions and variations made to the implementation methods are still within the scope of protection of the present invention.

Claims

1. A high-isolation three-cavity curved waveguide, characterized by: It includes a waveguide wall, a waveguide cavity, a first flange, a second flange, a plug, a flange mounting hole, a positioning hole, and a positioning pin. Three waveguide cavities are arranged in the waveguide wall, and the waveguide cavity is "L"-shaped; the first flange and the second flange are respectively arranged at the port of the waveguide cavity and connected to the waveguide wall. The first flange and the second flange are rectangular, and a flange mounting hole is respectively arranged at the four corners of the rectangle; the first flange and the second flange each have three waveguide cavities of the same size, a positioning hole is respectively arranged on both sides of the long side of the waveguide cavity, and a positioning pin is arranged between the two waveguide cavities. The plug is arranged at the rectangular step through hole of the waveguide cavity, and the middle waveguide cavity and the waveguide cavities on both sides share a waveguide wall. The waveguide wall is made of aluminum alloy. The waveguide cavity is three rectangular cavities processed on a metal shell. The waveguide cavity is in the body and is an "L"-shaped curved waveguide cavity. The long side of the waveguide cavity is parallel to the long sides of the first flange and the second flange. A positioning hole is provided on each side of the long side of the waveguide cavity, which is used for inserting the positioning pin of the matching end when the three waveguide cavities are connected to the waveguide cavity at the other end, so as to achieve the effect of quickly aligning the waveguide cavities to be connected at both ends. Positioning pins are provided on the first flange and the second flange, and the positioning pins are respectively located in the middle position of two adjacent rectangular waveguide cavities. The positioning pins are used to insert into the positioning holes of the matching end, so as to also achieve the effect of quickly aligning the waveguide cavities to be connected at both ends. By processing the three waveguide cavities in a metal waveguide wall, sharing the waveguide tube of the first flange and the second flange, and processing the flange mounting holes only at the four corners of the first flange and the second flange, the mounting holes of the two waveguide cavity flanges are reduced.

2. The high-isolation three-cavity curved waveguide according to claim 1, characterized in that: The "L"-shaped rectangular waveguide cavity is processed into a rectangular through hole at the deeper end of the cavity, and is processed into a rectangular stepped through hole at the shallower end of the cavity. The size of one end of the stepped hole is larger than the size of the waveguide cavity. A plug is pressed into one end of the stepped hole. The size of the plug matches the size of the stepped hole, that is, the cavity size at the plug is smaller than the waveguide cavity. The plug is welded to the waveguide wall by aluminum brazing, and the plug after aluminum brazing is subjected to secondary processing to remove the portion of the plug protruding from the waveguide cavity so that the cavity at the plug and the waveguide cavity are located on the same plane.

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