阅读说明：本技术 一种工作于c波段的矩形波导te10-圆波导tm01模式转换器及转换方法 (Rectangular waveguide TE 10-circular waveguide TM01 mode converter working in C wave band and conversion method ) 是由 任杰 翁明 李永东 曹猛 林舒 于 2021-08-27 设计创作，主要内容包括：本发明公开了一种工作于C波段的矩形波导TE10-圆波导TM01模式转换器及转换方法属微波模式转换器领域,旨在解决缺少C波段的矩形波导TE10-圆波导TM01模式转换器及转换效率低的问题。本发明提出的模式转换器将矩形波导结构和矩形槽结构连接起来实现电磁波的模式转换,再对矩形波导结构的上方设置圆波导结构,将转换为圆波导TM01模式的电磁波输入圆波导结构中,通过对圆波导结构上设置阻抗匹配结构来调整圆波导结构中的电磁波实现输出,通过以上部件实现模式转换,结构简单。本发明提出的模式转换器利用CST电磁仿真软件验证了转换器具有较高的模式转换性能,具有能量高效传输、低反射和低损耗的优点,在微波模式转换领域具有较好的应用前景。(The invention discloses a rectangular waveguide TE 10-circular waveguide TM01 mode converter working in a C wave band and a conversion method, belongs to the field of microwave mode converters, and aims to solve the problems that a rectangular waveguide TE 10-circular waveguide TM01 mode converter lacking the C wave band is short and the conversion efficiency is low. The mode converter provided by the invention connects the rectangular waveguide structure and the rectangular groove structure to realize mode conversion of electromagnetic waves, then the circular waveguide structure is arranged above the rectangular waveguide structure, the electromagnetic waves converted into the circular waveguide TM01 mode are input into the circular waveguide structure, the electromagnetic waves in the circular waveguide structure are adjusted to realize output by arranging the impedance matching structure on the circular waveguide structure, and the mode conversion is realized through the components, so that the structure is simple. The mode converter provided by the invention utilizes CST electromagnetic simulation software to verify that the converter has higher mode conversion performance, has the advantages of efficient energy transmission, low reflection and low loss, and has better application prospect in the field of microwave mode conversion.)

1. A rectangular waveguide TE 10-circular waveguide TM01 mode converter working in C wave band is characterized by comprising a rectangular waveguide structure (1) and a circular waveguide structure (3);

the circular waveguide structure (3) is located above the rectangular waveguide structure (1), the impedance matching section structure (4) is connected above the circular waveguide structure (3), and the rectangular groove structure (2) is installed below the rectangular waveguide structure (1).

2. The rectangular waveguide TE 10-circular waveguide TM01 mode converter for C-band operation according to claim 1, characterized in that the rectangular waveguide structure (1) comprises a transmitting waveguide segment (5) and a cut-off waveguide segment (6), the transmitting waveguide segment (5) and the cut-off waveguide segment (6) being separated by a rectangular slot structure (2), the length of the transmitting waveguide segment (5) being greater than the length of the cut-off waveguide segment (6).

3. The rectangular waveguide TE 10-circular waveguide TM01 mode converter for C-band operation of claim 2, characterized in that the axis of the circular waveguide structure (3) is located at the intersection of the transmission waveguide segment (5) and the cut-off waveguide segment (6).

4. The rectangular waveguide TE 10-circular waveguide TM01 mode converter for C-band operation of claim 2, characterized in that the transmission waveguide section (5) is open-ended for microwave input.

5. The rectangular waveguide TE 10-circular waveguide TM01 mode converter for C-band operation of claim 2, characterized in that the cut-off waveguide section (6) is port-closed for cutting off microwaves.

6. The rectangular waveguide TE 10-circular waveguide TM01 mode converter for C-band operation of claim 1, characterized in that the center of the rectangular slot structure (2) coincides with the axis of the circular waveguide structure (3).

7. The rectangular waveguide TE 10-circular waveguide TM01 mode converter for C-band operation of claim 1, wherein the axis of the circular waveguide structure (3) coincides with the axis of the impedance matching section structure (4).

8. The rectangular waveguide TE 10-circular waveguide TM01 mode converter for C-band operation of claim 1, characterized in that the impedance matching section structure (4) is composed of 3-step circular waveguides.

9. The method for converting the rectangular waveguide TE 10-circular waveguide TM01 mode converter working in the C band as claimed in any one of claims 1 to 8, comprising the steps of:

s1, inputting electromagnetic waves into a rectangular waveguide TE10 mode from the rectangular waveguide structure (1);

s2, converting the electromagnetic wave into a circular waveguide TM01 mode according to the rectangular groove structure (2) and the rectangular waveguide structure (1), and inputting the electromagnetic wave converted into the circular waveguide TM01 mode into the circular waveguide structure (3);

s3, after the electromagnetic wave in the circular waveguide structure (3) is adjusted through the impedance matching section structure (4), the TM01 mode of the circular waveguide is output.

10. The method for converting the rectangular waveguide TE 10-circular waveguide TM01 mode converter operating in C band as claimed in claim 9, wherein in S2, the rectangular slot structure (2) and the cut-off waveguide section (6) of the rectangular waveguide structure (1) are used to convert the electromagnetic wave into the circular waveguide TM01 mode.

Technical Field

The invention belongs to the field of microwave mode converters, and relates to a rectangular waveguide TE 10-circular waveguide TM01 mode converter working in a C wave band and a conversion method.

Background

The high-power microwave has wide application in various aspects of society and military, such as high-power microwave weapons, plasma heating, medical nuclear magnetic resonance and other scientific researches and military engineering. High power microwave systems are not designed to operate with high power microwave conducting structures, where the mode converter is particularly important as the connection between the microwave source and each transmission line.

The mode converter is a common microwave system device, and a traditional high-power microwave generating device generates a TM01 mode, and generally needs to convert a TM01 mode into a linearly polarized circular waveguide TE11 mode or a rectangular waveguide TE10 mode for multi-path synthesis and radiation of high-power microwaves. High power microwaves often require mode conversion from different forms of waveguides in order to facilitate mode control during transmission. Most of the existing mode converters mainly work in an X wave band, the working center frequency is generally near 8GHz and 10GHz, and few mode converters work in a C wave band. Most of the current mode converters are circular waveguide-circular waveguide and rectangular waveguide-rectangular waveguide conversion, and a rectangular waveguide-circular waveguide mode converter working in a C wave band is lacked.

Disclosure of Invention

In order to overcome the drawbacks of the prior art, the present invention provides a rectangular waveguide TE 10-circular waveguide TM01 mode converter operating in C-band and a conversion method thereof, and aims to solve the problem that the prior art lacks the C-band operation and cannot realize the rectangular waveguide-circular waveguide conversion.

In order to achieve the purpose, the invention adopts the following technical scheme to realize the purpose:

the invention provides a rectangular TE 10-circular waveguide TM01 mode converter working in a C wave band, which comprises a rectangular waveguide structure and a circular waveguide structure;

the circular waveguide structure is positioned above the rectangular waveguide structure, the impedance matching section structure is connected above the circular waveguide structure, and the rectangular groove structure is arranged below the rectangular waveguide structure.

Preferably, the rectangular waveguide structure includes a transmitting waveguide segment and a cut-off waveguide segment, the transmitting waveguide segment and the cut-off waveguide segment being separated by a rectangular slot structure, the length of the transmitting waveguide segment being greater than the length of the cut-off waveguide segment.

Preferably, the axis of the circular waveguide structure is located at the intersection of the transmission waveguide segment and the cut-off waveguide segment.

Preferably, the transmission waveguide section is open-ended for microwave input.

Preferably, the cut-off waveguide section is port-closed for cutting off microwaves.

Preferably, the center of the rectangular slot structure coincides with the axis of the circular waveguide structure.

Preferably, the axis of the circular waveguide structure coincides with the axis of the impedance matching section structure.

Preferably, the impedance matching section structure is composed of 3-stage stepped circular waveguides.

The invention also provides a conversion method of the rectangular waveguide TE 10-circular waveguide TM01 mode converter working in the C wave band, which comprises the following steps:

s1, inputting electromagnetic waves into a TE10 mode of the rectangular waveguide through the rectangular waveguide structure;

s2, converting the electromagnetic wave into a circular waveguide TM01 mode according to the rectangular groove structure and the rectangular waveguide structure, and inputting the electromagnetic wave converted into the circular waveguide TM01 mode into the circular waveguide structure;

and S3, outputting a circular waveguide TM01 mode after adjusting the electromagnetic wave in the circular waveguide structure through the impedance matching section structure.

Preferably, in S2, the electromagnetic wave is converted into a circular waveguide TM01 mode using a rectangular slot structure and a cut-off waveguide section of a rectangular waveguide structure.

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

the invention discloses a rectangular waveguide TE 10-circular waveguide TM01 mode converter structure working in a C wave band, which consists of a rectangular waveguide structure, a rectangular groove structure, a circular waveguide structure and an impedance matching section structure according to a microwave transmission direction. The invention can convert the electromagnetic wave of C wave band from the rectangular waveguide TE10 mode to the circular waveguide TM01 mode, has the characteristics of high conversion efficiency, low reflection and low interference, has simple structure and easy processing, can be used in the calibration monitoring system of various high-power microwave devices under low power, and has important practical application value in the test of high-power microwave devices and high-power microwave systems.

Furthermore, the transmission waveguide section and the cut-off waveguide section are separated by a rectangular groove structure, so that the performance of the hybrid mode exciter can be adjusted; the length of the rectangular waveguide transmission section is greater than that of the rectangular waveguide cut-off section, so that the transmission efficiency of the microwave is improved, and the reflection is reduced.

Furthermore, the axis of the circular waveguide structure coincides with the axis of the impedance matching section structure, so that the transmission speed of the electromagnetic waves in the converter can be increased.

Further, the transmission waveguide section is open and can be used for inputting microwaves; the end of the cut-off waveguide section is closed and can be used for cutting off microwaves.

Further, according to the chebyshev impedance transformation section principle, the impedance matching section adopts a three-order chebyshev impedance transformation section.

The invention also provides a conversion method of the rectangular TE 10-circular waveguide TM01 mode converter working in the C wave band, which combines the common rectangular waveguide suitable for the C wave band with the circular waveguide, electromagnetic waves are input into the rectangular TE10 mode from the rectangular waveguide port, the electromagnetic waves are converted into the circular waveguide TM01 mode by the rectangular groove structure and the rectangular waveguide cut-off section, the circular waveguide TM01 mode is input into the circular waveguide part, and finally the circular waveguide TM01 mode is output after being adjusted by the impedance matching part.

Drawings

FIG. 1 is a schematic diagram of the structure of the vacuum part inside the rectangular waveguide TE 10-circular waveguide TM01 mode converter of the present invention;

FIG. 2 is a rear view of FIG. 1;

FIG. 3 is a left side view of FIG. 1;

FIG. 4 is a diagram of the parameters of the CST simulation rectangular waveguide TE10 mode S11 according to the present invention;

FIG. 5 is a diagram of parameters of the CST simulation circular waveguide TM01 mode S21 according to the present invention.

Wherein: 1-a rectangular waveguide structure; 2-a rectangular groove structure; 3-a circular waveguide structure; 4-impedance matching section structure; 5-a transmission waveguide segment; 6-cut off the waveguide section.

Detailed Description

In order to make the technical solutions of the present invention better understood, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. 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 should be noted that the terms "first," "second," and the like in the description and claims of the present invention 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 invention described herein are capable of operation in sequences other than those illustrated or described herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.

The invention is described in further detail below with reference to the accompanying drawings:

referring to fig. 2, the rectangular waveguide TE 10-circular waveguide TM01 mode converter structure with the rectangular slot structure disclosed in the present invention includes a rectangular waveguide structure 1, a rectangular slot structure 2, a circular waveguide structure 3 and an impedance matching section structure 4, and referring to fig. 1, the rectangular waveguide structure 1 is divided into a transmission waveguide portion 5 and a cut-off waveguide portion 6, and the middle of the transmission waveguide portion 5 and the cut-off waveguide portion 6 is separated by the rectangular slot structure 2, which is a rear view of the rectangular waveguide TE 10-circular waveguide TM01 mode converter structure with the rectangular slot structure disclosed in the present invention. Without the rectangular slot structure 2, the transfer section 1 and the shut-off section 3 are integral. The rectangular groove structure 2 is added to adjust the performance of the converter, improve the efficiency of mode conversion and avoid the occurrence of interference modes.

Referring to fig. 3, the center of the rectangular slot structure 2 coincides with the axis of the circular waveguide structure 3, and the axis of the circular waveguide structure 3 coincides with the axis of the impedance matching section structure 4. The rectangular waveguide structures 1 are separated by the rectangular groove structures 2, the transmission waveguide part 5 is a longer part, and a port is open and is used for inputting microwaves; the cut-off waveguide part 6 is a shorter part, the port is closed, the lengths of the transmission waveguide section 5 and the cut-off waveguide section 6 are both a specific value, and when the length of the transmission waveguide section 5 is greater than that of the cut-off waveguide section 6, the transmission efficiency of microwaves can be improved, and reflection is reduced. The impedance matching section structure 4 is composed of 3 sections of stepped circular waveguides, and according to the Chebyshev impedance transformation section principle, the impedance matching section adopts a three-step Chebyshev impedance transformation section. The axis of the circular waveguide structure 3 is located at the junction of the transmission waveguide segment 5 and the cut-off waveguide segment 6.

The structure of the present invention is specifically designed and described below with reference to data, and the entire structure of the mode converter is made of a metal material.

Referring to fig. 1 and 2, in the present embodiment, the input end face of the transmission waveguide portion 5 has a length of 47.55mm, a width of 22.15mm, and a length in the microwave input direction of 97 mm; the length of the parallel surface of the rectangular groove structure 2 and the input end surface is 90mm, the width is 29mm, and the length along the microwave input direction is 22.2 mm; the length of the cut-off waveguide portion 6 parallel to the input end face was 47.55mm, the width was 22.15mm, and the length in the microwave input direction was 65 mm.

The diameter of the circular waveguide structure 3 is 64.8mm and the height is 170.6 mm. The impedance matching section structure 4 is composed of 3 sections of stepped circular waveguides, from bottom to top, the diameter of the first section is 72mm, and the height is 14.4 mm; the diameter of the second section is 92.8mm, and the height is 14.6 mm; the third section had a diameter of 110mm and a height of 51.06 mm.

The performance of the obtained mode converter with the rectangular groove structure is further illustrated by the following simulation experiments:

after the antenna is modeled and simulated by using CST electromagnetic simulation software, S11 parameters of a rectangular waveguide TE10 mode and S21 parameters of a circular waveguide TM01 mode are respectively shown in FIG. 4 and FIG. 5. As can be seen from FIG. 4, the S11 parameter of the rectangular waveguide TE10 mode is less than-15 dB in the 4.07-4.40 GHz band, and as can be seen from FIG. 5, the 21 parameter of the circular waveguide TM01 mode is greater than-0.2 dB in the 4.07-4.42 GHz band, which fully indicates that the rectangular waveguide TE 10-circular waveguide TM01 mode converter working in the C band provided by the application has higher mode conversion performance, and has the advantages of energy efficient transmission, low reflection and low loss.

The invention also provides a conversion method of the rectangular waveguide TE 10-circular waveguide TM01 mode converter working in the C wave band, which comprises the following steps:

s1, inputting electromagnetic waves into a rectangular waveguide TE10 mode from the rectangular waveguide structure 1;

s2, converting the electromagnetic wave into a circular waveguide TM01 mode according to the rectangular groove structure 2 and the rectangular waveguide structure 1, and inputting the electromagnetic wave converted into the circular waveguide TM01 mode into the circular waveguide structure 3;

s3, after the electromagnetic wave in the circular waveguide structure 3 is adjusted through the impedance matching section structure 4, the circular waveguide TM01 mode is output.

Further, in S2, the electromagnetic wave is converted into the circular waveguide TM01 mode using the rectangular slot structure 2 and the cut-off waveguide section 6 of the rectangular waveguide structure 1.

The above-mentioned contents are only for illustrating the technical idea of the present invention, and the protection scope of the present invention is not limited thereby, and any modification made on the basis of the technical idea of the present invention falls within the protection scope of the claims of the present invention.