CN217035943U

CN217035943U - Spliced curved waveguide

Info

Publication number: CN217035943U
Application number: CN202220456426.8U
Authority: CN
Inventors: 李惠; 王洪毅; 王清明; 张定桂; 吴兴春; 卢翔
Original assignee: Chengdu Xixia Technology Development Co ltd
Current assignee: Chengdu Xixia Technology Development Co ltd
Priority date: 2022-03-04
Filing date: 2022-03-04
Publication date: 2022-07-22
Anticipated expiration: 2032-03-04

Abstract

The utility model relates to a spliced curved waveguide, which comprises two sections of straight waveguide joints, wherein a section of arc waveguide is connected between the two sections of straight waveguide joints, the arc waveguide comprises two parallel side plates, an inner arc surface and an outer arc surface, the side plates, the inner arc surface and the outer arc surface are enclosed to form a hollow arc waveguide, a first clamping groove and a second clamping groove are formed in one opposite side of each side plate, a first convex strip is arranged on the outer edge of the inner arc surface corresponding to the first clamping groove, a second convex strip is arranged on the inner edge of the outer arc surface corresponding to the second clamping groove, and a plurality of impedance matching holes are formed in one opposite side of each side plate. Before the arc waveguide is welded, the side plate, the inner arc surface and the outer arc surface are matched with the raised line by the clamping groove and are pre-fixed, so that the phenomenon that the welding seam in the inner cavity of the arc waveguide is uneven due to dislocation and uneven welding seams in the welding process is prevented, and the frequency of microwave power fluctuation is further reduced.

Description

Spliced curved waveguide

Technical Field

The utility model relates to the technical field of microwave devices, in particular to a spliced bent waveguide.

Background

The transmission, construction, receiving and detection of terahertz waves strongly depend on various high-quality terahertz microstructure devices in a terahertz system. The terahertz waveguide is one of the most representative key core devices, the types are complex and various, the metal hollow cladding rectangular waveguide has the advantages of low loss, good flexibility, high safety and the like, and the application requirement is increasingly urgent. WAVEGUIDE (WAVEGUIDE) is a structure used to directionally guide electromagnetic waves. In electromagnetism and communications engineering, the term waveguide may refer to any linear structure that transmits electromagnetic waves between its end points, originally and most commonly referred to as a hollow metal tube used to transmit radio waves. The main structure of the curved waveguide is that an arc hole with a uniform section is arranged in the curved waveguide, and the shape of the arc hole is rectangular. Because the arc-shaped hole cavity is difficult to process, the waveguide is formed by tailor-welding, but in the splicing process, the forming precision of the arc-shaped hole is poor, when tailor-welding is carried out under certain external force, the gap of the arc-shaped hole is changed, the welding line is uneven, and the microwave power fluctuates during use, so that the transmission precision of the microwave power is reduced.

SUMMERY OF THE UTILITY MODEL

Therefore, the spliced curved waveguide needs to be provided for the situation that microwave power conversion is easily caused by overlarge arc hole gaps when the existing curved waveguide is spliced and welded into a whole.

The utility model provides a concatenation formula curved waveguide, includes two sections straight waveguide joint, two be connected with one section circular arc waveguide between the straight waveguide joint, circular arc waveguide includes the curb plate of two parallels, intrados and extrados, curb plate, intrados and extrados enclose and draw together and form hollow circular arc waveguide, two the one side that the curb plate is relative all is provided with first draw-in groove and second draw-in groove, the outside of intrados corresponds first draw-in groove is provided with first sand grip, the interior limit of extrados corresponds the second draw-in groove is provided with the second sand grip, two the one side that the curb plate was carried on the back mutually still is provided with a plurality of impedance matching holes.

Preferably, the diameter of the impedance matching hole is gradually increased from inside to outside.

Preferably, the radian of the inner arc surface and the outer arc surface is 90 degrees.

Preferably, the impedance matching holes are provided at corners of the side plates.

Preferably, two sections of straight waveguide connects and deviates from the one end of circular arc waveguide is provided with the ring flange, be provided with bolt hole and fixed pin on the ring flange.

Preferably, the straight waveguide joint and the arc waveguide are made of copper, and the inner cavities of the straight waveguide joint and the arc waveguide are subjected to silver plating.

The utility model has the advantages that: 1. before the arc waveguide is welded, the side plate, the inner arc surface and the outer arc surface are matched with the raised line by the clamping groove and are pre-fixed, so that the phenomenon that the welding seam in the inner cavity of the arc waveguide is uneven due to dislocation and uneven welding seams in the welding process is prevented, and the frequency of microwave power fluctuation is reduced; 2. the surface of the circular arc waveguide is provided with an impedance matching hole for inserting a tuning screw to restrain the unnecessary frequency signal passing through the circular arc waveguide, and the circular arc waveguide has a simple integral structure and a wide application range.

Drawings

FIG. 1 is a schematic perspective view of a spliced curved waveguide according to an embodiment;

fig. 2 is an exploded view of a circular arc waveguide.

Detailed Description

In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in detail below. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein, as those skilled in the art will recognize without departing from the spirit and scope of the present invention.

It will be understood that when an element is referred to as being "secured to" or "disposed on" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "left," "right," and the like as used herein are for illustrative purposes only and do not represent the only embodiments.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used herein in the description of the utility model is for the purpose of describing particular embodiments only and is not intended to be limiting of the utility model. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.

As shown in fig. 1-2, a concatenation formula curved waveguide, includes two sections straight waveguide joint 1, two sections be connected with one section circular arc waveguide 2 between the straight waveguide joint 1, circular arc waveguide 2 includes two parallel curb plates 21, intrados 22 and extrados 23, curb plate 21, intrados 22 and extrados 23 enclose and draw together and form hollow circular arc waveguide 2, two the one side that curb plate 21 is relative all is provided with first draw-in groove 211 and second draw-in groove 212, the outside of intrados 22 corresponds first draw-in groove 211 is provided with first sand grip 221, the interior limit of extrados 23 corresponds second draw-in groove 212 is provided with second sand grip 231, two the one side that curb plate 21 carried on the back mutually still is provided with a plurality of impedance matching holes 213. Specifically, in the present embodiment, the straight waveguide joint 1 and the arc waveguide 2 are made of copper, and after the straight waveguide joint 1 and the arc waveguide 2 are assembled, the inner cavities of the straight waveguide joint 1 and the arc waveguide 2 are plated with silver, which is mainly because silver has good electrical conductivity. When assembling the arc waveguide 2, because the side plate 21, the inner arc surface 22 and the outer arc surface 23 are connected into a whole by adopting a welding process, because the inner arc surface 22 and the outer arc surface 23 have certain elastic stress when being welded with the side plate 21, and during direct welding, dislocation easily occurs in the inner cavity of the arc waveguide 2, so that the welding seam is changed too much and is not flat, and the microwave passing through the inner cavity of the arc waveguide 2 fluctuates. Therefore, a technician sets a first locking groove 211 and a second locking groove 212 on the side plate 21, which are respectively used for being locked with the first protruding strip 221 and the second protruding strip 231 on the inner arc surface 22 and the outer arc surface 23, so that the welding is kept stable during welding, uneven welding seams in the inner cavity of the arc waveguide 2 due to factors such as assembly and self-stress can be avoided, and the fluctuation range in the microwave conduction process can be reduced. Two sections of straight waveguide joints 1 are arranged at two ends of the arc waveguide 2, and the straight waveguide joints 1 are connected with other parts of the radar antenna into a whole, so that microwave signal leakage and distortion can be avoided conveniently. Further, two impedance matching holes 213 are provided in the side plate 21, and in this embodiment, the diameters of the impedance matching holes 213 gradually increase from the bottom to the outside, and a tuning pin is inserted into the impedance matching holes 213, so that the noise passing through the arc waveguide 2 can be filtered. The bent waveguide formed by the method can realize signal selection of signals entering from the straight waveguide joint 1, and suppress unnecessary frequency signals by signals of required frequencies; the signal is further processed by an external impedance matching unit on the impedance matching hole 213 and then output from the straight waveguide joint 1 at the other end.

As shown in fig. 1-2, the radian of the intrados 22 and the extrados 23 is 90 degrees, and the overall volume of the curved waveguide is reduced by adopting a shorter bending distance and a smaller bending radius.

Specifically, the impedance matching hole 213 is provided at a corner of the side plate.

As shown in fig. 1, a flange 11 is disposed at one end of the two straight waveguide joints 1 away from the circular waveguide 2, and a bolt hole 111 and a fixing pin 112 are disposed on the flange 11. Specifically, the flange 11 is provided for extending or inserting the waveguide elements to connect the waveguide elements to each other, so that even if a current node is formed at a mechanical contact position, a slight gap or a slight twist exists between two waveguide end surfaces, a short-circuit reactance is still present therebetween, so as to achieve microwave coupling for direct current open circuit and radio frequency short circuit, and the flange 11 is provided with a fixing pin 112 and a bolt hole 111, thereby achieving the purpose of quick assembly and disassembly.

The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.

The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is specific and detailed, but not to be construed as limiting the scope of the utility model. It should be noted that various changes and modifications can be made by those skilled in the art without departing from the spirit of the utility model, and these changes and modifications are all within the scope of the utility model. Therefore, the protection scope of the present patent shall be subject to the appended claims.

Claims

1. A spliced curved waveguide, comprising: including two sections straight waveguide joints, two sections be connected with one section circular arc waveguide between the straight waveguide joint, circular arc waveguide includes the curb plate of two parallels, intrados and extrados, curb plate, intrados and extrados enclose and hold up formation hollow circular arc waveguide, two the one side that the curb plate is relative all is provided with first draw-in groove and second draw-in groove, the outside of intrados corresponds first draw-in groove is provided with first sand grip, the interior limit of extrados corresponds the second draw-in groove is provided with the second sand grip, two the one side that the curb plate carried on the back mutually still is provided with a plurality of impedance matching holes.

2. The spliced waveguide of claim 1, wherein: the diameter of the impedance matching hole is gradually increased from inside to outside.

3. The spliced waveguide of claim 2, wherein: the radian of the inner arc surface and the outer arc surface is 90 degrees.

4. A spliced curved waveguide as claimed in claim 3 wherein: the impedance matching holes are arranged at the corners of the side plates.

5. The spliced waveguide of claim 1 or 4, wherein: and two sections of flanges are arranged at the ends of the straight waveguide joints, which deviate from the arc waveguides, and bolt holes and fixing pins are arranged on the flanges.

6. The spliced curved waveguide of claim 5, wherein: the straight waveguide joint and the arc waveguide are made of copper, and the inner cavities of the straight waveguide joint and the arc waveguide are subjected to silver plating treatment.