阅读说明：本技术 微波短路器 (Microwave short circuiter ) 是由 张博鹏 王平 牛焕焕 郝聪慧 蓝清宏 韩金刚 万知之 于 2020-12-30 设计创作，主要内容包括：本发明提供了一种微波短路器。微波短路器包括：波导结构；可调短路结构,可调短路结构与波导结构可移动地连接,且可调短路结构的至少一部分位于波导结构内,可调短路结构沿波导结构的轴向移动,可调短路结构具有至少两个相互独立的短路面,短路面可移动地设置在波导结构内。本发明解决了现有技术中微波短路器存在相位调整精度差的问题。(The invention provides a microwave short circuiter. The microwave short circuiter comprises: a waveguide structure; the adjustable short circuit structure is movably connected with the waveguide structure, at least one part of the adjustable short circuit structure is positioned in the waveguide structure, the adjustable short circuit structure moves along the axial direction of the waveguide structure, the adjustable short circuit structure is provided with at least two mutually independent short circuit surfaces, and the short circuit surfaces are movably arranged in the waveguide structure. The invention solves the problem of poor phase adjustment precision of the microwave short circuiter in the prior art.)

1. A microwave crowbar, comprising:

a waveguide structure (10);

an adjustable short circuit structure (20), wherein the adjustable short circuit structure (20) is movably connected with the waveguide structure (10), at least one part of the adjustable short circuit structure (20) is positioned in the waveguide structure (10), the adjustable short circuit structure (20) moves along the axial direction of the waveguide structure (10), the adjustable short circuit structure (20) is provided with at least two mutually independent short circuit surfaces (21), and the short circuit surfaces (21) are movably arranged in the waveguide structure (10).

2. Microwave short-circuit according to claim 1, characterized in that at least two of the short-circuit surfaces (21) differ in area.

3. A microwave crowbar according to claim 1, characterized in that the end of the adjustable short-circuiting structure (20) close to the entrance of the waveguide structure (10) has the short-circuiting surface (21).

4. A microwave crowbar according to claim 1, characterized in that the adjustable short-circuit structure (20) is arranged spaced apart from the inner circumferential surface of the waveguide structure (10), the outer circumferential surface of the adjustable short-circuit structure (20) being provided with a choke structure (22).

5. The microwave crowbar according to claim 1, characterized in that the adjustable shorting structure (20) comprises:

a first adjustable short-circuiting device (23), the first adjustable short-circuiting device (23) being movably connected with the waveguide structure (10), an end face of the first adjustable short-circuiting device (23) near one end of the inlet of the waveguide structure (10) being the short-circuiting surface (21);

a second adjustable short-circuit (24), the second adjustable short-circuit (24) being movably connected with the waveguide structure (10) or the first adjustable short-circuit (23), an end face of the second adjustable short-circuit (24) near an inlet of the waveguide structure (10) being used as the short-circuit face (21).

6. A microwave short according to claim 5, characterized in that the first adjustable short (23) is a cylindrical structure, the second adjustable short (24) is movably arranged inside the first adjustable short (23), the first adjustable short (23) is arranged spaced from the inner circumference of the waveguide structure (10), and the outer circumference of the first adjustable short (23) is provided with a choke structure (22).

7. A microwave short according to claim 6, characterized in that the second adjustable short (24) is of a cylindrical configuration, the second adjustable short (24) being arranged at a distance from the first adjustable short (23), the outer circumference of the second adjustable short (24) being provided with a choke configuration (22).

8. The microwave crowbar according to claim 7, characterized in that the second adjustable crowbar (24) is at least one,

when the number of the second adjustable short-circuit devices (24) is one, the second adjustable short-circuit devices (24) and the first adjustable short-circuit devices (23) are coaxially arranged; or

When the number of the second adjustable short-circuiting devices (24) is multiple, the second adjustable short-circuiting devices (24) are arranged in the first adjustable short-circuiting device (23) at intervals.

9. A microwave crowbar according to claim 5, characterized in that the second adjustable crowbar (24) is a cylindrical structure, the adjustable short-circuiting structure (20) further comprises a third adjustable crowbar, which is cylindrical, which is arranged inside the second adjustable crowbar (24), the end face of the end of the third adjustable crowbar near the entrance of the waveguide structure (10) being the short-circuiting surface (21), which is arranged coaxially with the second adjustable crowbar (24) and the first adjustable crowbar (23), the outer peripheral surface of which has a choke structure (22).

10. A microwave crowbar according to any of claims 1-9, characterized in that the waveguide structure (10) comprises:

a square waveguide (11);

one end of the square waveguide (11) is connected and communicated with the circular waveguide (12), and the adjustable short circuit structure (20) is arranged in the circular waveguide (12).

11. Microwave short-circuit according to claim 10, characterized in that the square waveguide (11) is connected at an angle to the circular waveguide (12).

12. A microwave crowbar according to claim 11, characterized in that the square waveguide (11) is perpendicular to the circular waveguide (12).

13. A microwave crowbar according to claim 11, characterized in that the end of the circular waveguide (12) remote from the adjustable short-circuit structure (20) has a matching adjustment slot (13) recessed to the side where the adjustable short-circuit structure (20) is located.

Technical Field

The invention relates to the technical field of microwave equipment, in particular to a microwave short circuiter.

Background

With the development of science and technology, the application fields of the electron linear accelerator are more and more extensive, such as medical electron linear accelerator, irradiation electron linear accelerator, nondestructive testing accelerator, scientific research accelerator and the like. The requirements for the energy of the accelerator are different under different conditions, for example, the medical accelerator selects rays with different energies for treatment according to different tumors at different parts; the irradiation accelerator selects rays with different energies according to the penetration depths of different cargos to irradiate; the nondestructive testing accelerator also selects rays of corresponding energy gears to take pictures according to the thicknesses of different workpieces.

At present, there are many methods for adjusting the energy of the electron linear accelerator, one of which is to divide the accelerating tube into two sections, and control the electron energy by adjusting the power and phase of the input microwave of the second section of accelerating tube. The method has the advantages of flexible adjustment of electron energy and wide adjustment range, and is already used in medical accelerators. Wherein the adjustment of the phase requires the use of an adjustable short-circuiting surface.

The cross section of the high-power short-circuit surface mainly has a circular shape and a rectangular shape, and generally, in order to prevent the short-circuit surface from contacting with the waveguide, a choke structure (the short-circuit surface moves to allow microwave total reflection) needs to be arranged on the waveguide or a moving body. The phase adjustment of the short-circuit surface is related to the position accuracy of the short-circuit surface, and the higher the position accuracy is, the more accurate the phase control is. At present, the short-circuit surface is only provided with a movable main body, the adjustment and control of the phase are difficult, the adjustment time of the short-circuit surface is too long, and the working efficiency is lower. In addition, most of the existing short-circuit surfaces have small sections generally in order to be matched with standard waveguides, and particularly square waveguides cause the high-power performance to be reduced and the ignition probability to be increased.

That is, the microwave short-circuiting device in the prior art has the problem of poor phase adjustment precision.

Disclosure of Invention

The invention mainly aims to provide a microwave short circuiter, which solves the problem of poor phase adjustment precision of the microwave short circuiter in the prior art.

In order to achieve the above object, the present invention provides a microwave short circuiter, comprising: a waveguide structure; the adjustable short circuit structure is movably connected with the waveguide structure, at least one part of the adjustable short circuit structure is positioned in the waveguide structure, the adjustable short circuit structure moves along the axial direction of the waveguide structure, the adjustable short circuit structure is provided with at least two mutually independent short circuit surfaces, and the short circuit surfaces are movably arranged in the waveguide structure.

Further, the areas of at least two short-circuit surfaces are different.

Further, the end of the adjustable short-circuit structure close to the entrance of the waveguide structure has a short-circuit surface.

Furthermore, the adjustable short circuit structure is arranged at an interval with the inner peripheral surface of the waveguide structure, and the outer peripheral surface of the adjustable short circuit structure is provided with a choke structure.

Further, the adjustable short circuit structure includes: the first adjustable short-circuiting device is movably connected with the waveguide structure, and the end face of one end, close to the inlet of the waveguide structure, of the first adjustable short-circuiting device is used as a short-circuiting surface; and the end surface of one end, close to the inlet of the waveguide structure, of the second adjustable short-circuiting device is used as a short-circuiting surface.

Furthermore, the first adjustable short-circuiting device is of a cylindrical structure, the second adjustable short-circuiting device is movably arranged in the first adjustable short-circuiting device, the first adjustable short-circuiting device is arranged at an interval with the inner peripheral surface of the waveguide structure, and the outer peripheral surface of the first adjustable short-circuiting device is provided with a choking structure.

Furthermore, the second adjustable short-circuiting device is of a columnar structure, the second adjustable short-circuiting device and the first adjustable short-circuiting device are arranged at intervals, and the peripheral surface of the second adjustable short-circuiting device is provided with a choking structure.

Furthermore, when the number of the second adjustable short circuiters is one, the second adjustable short circuiters are coaxially arranged with the first adjustable short circuiters; or when the number of the second adjustable short-circuiting devices is multiple, the multiple second adjustable short-circuiting devices are arranged in the first adjustable short-circuiting device at intervals.

Furthermore, the second adjustable short-circuiting device is of a cylindrical structure, the adjustable short-circuiting structure further comprises a third adjustable short-circuiting device, the third adjustable short-circuiting device is of a cylindrical shape and is arranged in the second adjustable short-circuiting device, the end face of one end, close to the inlet of the waveguide structure, of the third adjustable short-circuiting device is used as a short-circuiting face, the third adjustable short-circuiting device, the second adjustable short-circuiting device and the first adjustable short-circuiting device are coaxially arranged, and the peripheral face of the third adjustable short-circuiting device is provided with a choking structure.

Further, the waveguide structure includes: a square waveguide; one end of the square waveguide is connected and communicated with the circular waveguide, and the adjustable short circuit structure is arranged in the circular waveguide.

Furthermore, the square waveguide and the circular waveguide are connected in an angle.

Further, the square waveguide is perpendicular to the circular waveguide.

Furthermore, one end of the circular waveguide, which is far away from the adjustable short-circuit structure, is provided with a matching adjusting groove which is concave towards the side where the adjustable short-circuit structure is located.

By applying the technical scheme of the invention, the microwave short-circuiting device comprises a waveguide structure and an adjustable short-circuiting structure, wherein the adjustable short-circuiting structure is movably connected with the waveguide structure, at least one part of the adjustable short-circuiting structure is positioned in the waveguide structure, the adjustable short-circuiting structure moves along the axial direction of the waveguide structure, the adjustable short-circuiting structure is provided with at least two mutually independent short-circuiting surfaces, and the short-circuiting surfaces are movably arranged in the waveguide structure.

At least two mutually independent short-circuit surfaces are arranged on the adjustable short-circuit structure, so that the plurality of short-circuit surfaces can independently move in the waveguide structure to independently change the phase of the microwave injected into the waveguide structure. Of course, the short-circuit surfaces can also move synchronously to change the positions of the short-circuit surfaces together, so that the phase of the microwave can be adjusted in a larger range, and the coarse adjustment of the phase of the microwave is realized. The phase of the microwave can be adjusted within a small range by independently changing the position of a short-circuit surface, so that the fine adjustment of the phase of the microwave is realized. Meanwhile, the plurality of mutually independent short circuit surfaces are arranged on the adjustable short circuit structure, so that the coarse adjustment and the fine adjustment of the phase of the microwave can be realized simultaneously, and the adjustment precision of the phase of the microwave is greatly increased.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this application, illustrate embodiments of the invention and, together with the description, serve to explain the invention and not to limit the invention. In the drawings:

fig. 1 shows a schematic diagram of a microwave crowbar according to an alternative embodiment of the present invention.

Wherein the figures include the following reference numerals:

10. a waveguide structure; 11. a square waveguide; 12. a circular waveguide; 13. matching the adjusting groove; 20. an adjustable short circuit structure; 21. a short circuit plane; 22. a choke structure; 23. a first adjustable short circuiter; 24. a second adjustable crowbar.

Detailed Description

It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict. The present invention will be described in detail below with reference to the embodiments with reference to the attached drawings.

It is noted that, unless otherwise indicated, 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 application belongs.

In the present invention, unless specified to the contrary, use of the terms of orientation such as "upper, lower, top, bottom" or the like, generally refer to the orientation as shown in the drawings, or to the component itself in a vertical, perpendicular, or gravitational orientation; likewise, for ease of understanding and description, "inner and outer" refer to the inner and outer relative to the profile of the components themselves, but the above directional words are not intended to limit the invention.

The invention provides a microwave short circuiter, aiming at solving the problem of poor phase adjustment precision of the microwave short circuiter in the prior art.

As shown in fig. 1, the microwave short-circuiting device includes a waveguide structure 10 and an adjustable short-circuiting structure 20, the adjustable short-circuiting structure 20 is movably connected with the waveguide structure 10, at least a portion of the adjustable short-circuiting structure 20 is located in the waveguide structure 10, the adjustable short-circuiting structure 20 moves along the axial direction of the waveguide structure 10, the adjustable short-circuiting structure 20 has at least two mutually independent short-circuiting surfaces 21, and the short-circuiting surfaces 21 are movably disposed in the waveguide structure 10.

By providing at least two mutually independent short-circuit surfaces 21 on the adjustable short-circuit structure 20, the plurality of short-circuit surfaces 21 can be moved individually within the waveguide structure 10 to individually change the phase of the microwaves injected into the waveguide structure 10. Of course, the short-circuit surfaces 21 can also move synchronously to change the positions of the short-circuit surfaces 21 together, so that the phase of the microwave can be adjusted in a large range, and the coarse adjustment of the phase of the microwave is realized. The phase of the microwave can be adjusted within a small range by independently changing the position of one short-circuit surface 21, and the fine adjustment of the phase of the microwave is realized. Meanwhile, the plurality of mutually independent short circuit surfaces 21 are arranged on the adjustable short circuit structure 20, so that the coarse adjustment and the fine adjustment of the phase of the microwave can be realized simultaneously, and the adjustment precision of the phase of the microwave is greatly increased.

Specifically, at least two short-circuiting surfaces 21 are different in area. The adjustment range of the two short circuit surfaces 21 with different areas to the phase of the microwave is different, so that the adjustment of different ranges of the phase is realized, the adjustment of the phase is more accurate, the repeated adjustment is greatly avoided, and the adjustment efficiency is increased.

As shown in fig. 1, the end of the tunable short-circuiting structure 20 close to the entrance of the waveguide structure 10 has a short-circuiting surface 21. The short-circuiting surface 21 can totally reflect the microwaves directed to the short-circuiting surface 21, so that the totally reflected microwaves exit from the entrance of the waveguide structure 10 to change the phase of the microwaves. The short-circuiting surface 21 is arranged at an end of the adjustable short-circuiting structure 20 close to the entrance of the waveguide structure 10 to facilitate the reflection of microwaves by the short-circuiting surface 21.

As shown in fig. 1, the adjustable short circuit structure 20 is spaced apart from the inner circumferential surface of the waveguide structure 10, and the choke structure 22 is provided on the outer circumferential surface of the adjustable short circuit structure 20. The adjustable short circuit structure 20 and the inner peripheral surface of the waveguide structure 10 are arranged at an interval to ensure that the adjustable short circuit structure 20 can stably move in the waveguide structure 10, so that friction between the adjustable short circuit structure 20 and the waveguide structure 10 is avoided, further, the influence on the performance of the waveguide structure 10 is avoided, and the working stability of the waveguide structure 10 and the adjustable short circuit structure 20 is ensured. The choke structure 22 is disposed to prevent the microwave from flowing out from the gap between the adjustable short circuit structure 20 and the inner circumferential surface of the waveguide structure 10, so as to ensure that the microwave entering the waveguide structure 10 can be totally reflected by the short circuit surface 21, and then emitted to the inlet of the waveguide structure 10, and then flows out through the inlet of the waveguide structure 10.

It should be noted that the microwaves flowing into the waveguide structure 10 through the inlet of the waveguide structure 10 have a phase difference with the microwaves flowing out of the waveguide structure 10 through the inlet of the waveguide structure 10. The magnitude of the phase difference can be adjusted by adjusting the position of the short-circuiting surface 21.

As shown in fig. 1, the adjustable short-circuiting structure 20 includes a first adjustable short-circuiting device 23 and a second adjustable short-circuiting device 24, the first adjustable short-circuiting device 23 is movably connected to the waveguide structure 10, and an end surface of one end of the first adjustable short-circuiting device 23 near the entrance of the waveguide structure 10 serves as a short-circuiting surface 21; a second adjustable short-circuiting device 24 is movably connected to the waveguide structure 10 or the first adjustable short-circuiting device 23, and the end face of the second adjustable short-circuiting device 24 near the inlet end of the waveguide structure 10 serves as a short-circuiting surface 21. Two short-circuit surfaces 21 can be provided by arranging the first adjustable short-circuit device 23 and the second adjustable short-circuit device 24, and the position of the short-circuit surface 21 is adjusted by the positions of the first adjustable short-circuit device 23 and the second adjustable short-circuit device 24, so that the phase of the microwave is adjusted. The first adjustable short-circuiting device 23 and the second adjustable short-circuiting device 24 can move synchronously to adjust the positions of the two short-circuiting surfaces 21 synchronously, and the phase of the microwave is roughly adjusted. Of course, the first and second adjustable short-circuiters 23 and 24 can be moved independently to adjust the positions of the two short-circuitous surfaces 21 independently for fine adjustment of the phase of the microwave.

Of course, the areas of the short-circuit surface 21 on the first adjustable short-circuit device 23 and the short-circuit surface 21 on the second adjustable short-circuit device 24 may be different, so as to adjust the phase of the microwave in different ranges, thereby greatly increasing the accuracy of adjusting the phase of the microwave.

As shown in fig. 1, the first adjustable short 23 is a cylindrical structure, the second adjustable short 24 is movably disposed in the first adjustable short 23, the first adjustable short 23 is disposed apart from the inner circumferential surface of the waveguide structure 10, and the choke structure 22 is provided on the outer circumferential surface of the first adjustable short 23. The first adjustable short-circuiting device 23 is spaced from the inner circumferential surface of the waveguide structure 10 to ensure that no friction is generated between the first adjustable short-circuiting device 23 and the inner circumferential surface of the waveguide structure 10, so that the stability of the operation of the first adjustable short-circuiting device 23 and the waveguide structure 10 is increased, the arrangement of the choke structure 22 can prevent the microwave from flowing out from the space between the first adjustable short-circuiting device 23 and the inner circumferential surface of the waveguide structure 10, and ensure that the microwave entering the waveguide structure 10 can be totally reflected by the short-circuiting surface 21 and then emitted to the inlet of the waveguide structure 10 and then flows out through the inlet of the waveguide structure 10.

As shown in fig. 1, the second adjustable short-circuiting device 24 has a columnar structure, the second adjustable short-circuiting device 24 is disposed at a distance from the first adjustable short-circuiting device 23, and the choke structure 22 is provided on the outer peripheral surface of the second adjustable short-circuiting device 24. The arrangement is convenient for the first adjustable short-circuit device 23 and the second adjustable short-circuit device 24 to move independently, so as to avoid friction between the first adjustable short-circuit device 23 and the second adjustable short-circuit device 24 and increase the stability of the operation of the first adjustable short-circuit device 23 and the second adjustable short-circuit device 24. The choke structure 22 is arranged to effectively prevent the microwaves from flowing out from the space between the second adjustable short-circuiting device 24 and the inner circumferential surface of the first adjustable short-circuiting device 23, and ensure that the microwaves entering the waveguide structure 10 are all reflected by the short-circuiting surface 21, then emitted to the inlet of the waveguide structure 10, and then flow out through the inlet of the waveguide structure 10.

Specifically, the outlet end of the waveguide structure 10 is provided with an outward-turning convex edge, the outward-turning convex edge is provided with a sliding hole, one side of the first adjustable short-circuiting device 23, which is close to the outlet end of the waveguide structure 10, is provided with a sliding rib, the sliding rib extends out from the first adjustable short-circuiting device 23 to the direction of the waveguide structure 10, and a part of the sliding rib bends to the direction close to the inlet of the waveguide structure 10 and extends into the sliding hole, so that the first adjustable short-circuiting device 23 can move relative to the waveguide structure 10. Similarly, the movement principle of the second adjustable short-circuiting device 24 is the same, and the description thereof is omitted.

Of course, the movement of the first adjustable short 23 can be controlled manually or by machine.

Example one

As shown in fig. 1, when there is at least one second adjustable short-circuiting device 24, and there is one second adjustable short-circuiting device 24, the second adjustable short-circuiting device 24 is arranged coaxially with the first adjustable short-circuiting device 23. The arrangement is such that the area of the short-circuit surface 21 of the first adjustable short-circuit device 23 is larger than the area of the short-circuit surface 21 of the second adjustable short-circuit device 24, so that the first adjustable short-circuit device 23 is used as a coarse adjustment structure to perform coarse adjustment on the phase of the microwave, and the second adjustable short-circuit device 24 is used as a fine adjustment structure to perform fine adjustment on the phase of the microwave. Therefore, the adjustment precision of the phase of the microwave is greatly increased, and the phase of the microwave is convenient to regulate and control.

As shown in fig. 1, the waveguide structure 10 includes a square waveguide 11 and a circular waveguide 12, one end of the square waveguide 11 is connected and communicated with the circular waveguide 12, and an adjustable short-circuit structure 20 is disposed in the circular waveguide 12. The arrangement converts the TE10 mode of the square waveguide into the TM01 mode of the circular waveguide, the electric field and the magnetic field of the inner surface of the circular waveguide 12 are lower, the ignition probability of the short-circuit surface 21 can be greatly reduced, and the working stability of the microwave short-circuit device is improved.

It should be noted that the cross-sectional area of the square waveguide 11 is smaller than that of the circular waveguide 12, so that the electric field and the magnetic field in the circular waveguide 12 can be effectively reduced, and the probability of sparking of the short-circuit surface 21 is greatly reduced.

Optionally, the square waveguide 11 is angularly connected to the circular waveguide 12. The arrangement is convenient for transition from the square waveguide 11 to the circular waveguide 12, the limit effect on the size of the circular waveguide 12 is small, the circular waveguide 12 with large cross-sectional area is convenient to adopt, the ignition probability of the short circuit surface 21 is greatly reduced, and the stable work of the microwave short circuiter is ensured.

In the particular embodiment shown in fig. 1, the square waveguide 11 is perpendicular to the circular waveguide 12. The arrangement is convenient for the connection between the square waveguide 11 and the circular waveguide 12, and meanwhile, the circular waveguide 12 with a large cross section area can be adopted, so that the ignition probability of the short-circuit surface 21 is reduced, and the working stability of the microwave short-circuit device is ensured.

As shown in fig. 1, one end of the circular waveguide 12 away from the adjustable short-circuit structure 20 has a matching adjustment slot 13 recessed to the side where the adjustable short-circuit structure 20 is located. The arrangement of the matching adjusting groove 13 can ensure that the microwaves can completely flow out through the outlet of the circular waveguide 12 after entering the circular waveguide 12 from the square waveguide 11 when the waveguide structure 10 is adjusted, so that the microwaves are prevented from accumulating in the waveguide structure 10, and the working stability of the waveguide structure 10 is protected. The microwave is adjusted to flow out entirely from the outlet of the circular waveguide 12 by adjusting the depth a of the matching adjustment groove 13. Meanwhile, when the short-circuit surface 21 is not provided, the microwaves in the square waveguide 11 can be completely transmitted into the circular waveguide 12, so that a resonant cavity is prevented from being formed at the short-circuit surface 21, and the loss at the short-circuit surface 21 is reduced.

Example two

The difference from the first embodiment is that the number of the second adjustable short-circuit devices 24 is different.

In the present embodiment, when the second adjustable short-circuiting device 24 is plural, the plural second adjustable short-circuiting devices 24 are arranged at intervals in the first adjustable short-circuiting device 23. The arrangement of the second adjustable short-circuiting devices 24 can further increase the adjustment precision of the phase of the microwave, so that the phase of the microwave can be conveniently controlled, and the control precision of the phase is greatly improved.

EXAMPLE III

The difference from the first embodiment is that a third adjustable short-circuiting device is also provided.

In this embodiment, the second adjustable short-circuiting device 24 is a cylindrical structure, the adjustable short-circuiting structure 20 further includes a third adjustable short-circuiting device, the third adjustable short-circuiting device is cylindrical, the third adjustable short-circuiting device is disposed in the second adjustable short-circuiting device 24, an end surface of one end of the third adjustable short-circuiting device close to the entrance of the waveguide structure 10 is used as a short-circuiting surface 21, the third adjustable short-circuiting device is disposed coaxially with the second adjustable short-circuiting device 24 and the first adjustable short-circuiting device 23, and a choke structure 22 is disposed on an outer peripheral surface of the third adjustable short-circuiting device. The phase adjustment precision of the microwave is further improved, the phase of the microwave is convenient to control, and the phase control precision is greatly improved.

It is to be understood that the above-described embodiments are only a few, but not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments according to the present application. As used herein, the singular is intended to include the plural unless the context clearly dictates otherwise, and it should be further understood that the terms "comprises" and/or "comprising," when used in this specification, specify the presence of features, steps, operations, devices, components, and/or combinations thereof.

It should be noted that the terms "first," "second," and the like in the description and claims of this application and in the drawings described above are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used is interchangeable under appropriate circumstances such that the embodiments of the application described herein are capable of operation in sequences other than those illustrated or described herein.

The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.