阅读说明：本技术 一种同轴模式转换器及应用该转换器的微波辐射控制方法 (Coaxial mode converter and microwave radiation control method applying same ) 是由 李正红 谯志强 于 2021-09-27 设计创作，主要内容包括：本发明公开了一种同轴模式转换器及应用该转换器的微波辐射控制方法,主要解决现有转换器输入波导和输出波导不处于同一轴线、微波辐射的极化方向难以控制的问题。该转换器包括输入圆波导,与输入圆波导相接并倾斜设置的第一倾斜圆波导,与第一倾斜圆波导另一端相接并与输入圆波导平行的圆直相位匹配圆波导,关于圆直相位匹配圆波导的中心对称设置的第二倾斜圆波导,以及与第二倾斜圆波导另一端相接的输出圆波导；其中,所述输入圆波导和输出圆波导的中心处于同一轴线上。本发明实现了圆波导TM01到圆波导TE11模式的完全转换,从输出端输出圆波导TE11模式的微波,同时还要保证输入波导和输出波导处于同一轴线。(The invention discloses a coaxial mode converter and a microwave radiation control method using the same, and mainly solves the problems that an input waveguide and an output waveguide of the conventional converter are not in the same axis, and the polarization direction of microwave radiation is difficult to control. The converter comprises an input circular waveguide, a first inclined circular waveguide which is connected with the input circular waveguide and is obliquely arranged, a round straight phase matching circular waveguide which is connected with the other end of the first inclined circular waveguide and is parallel to the input circular waveguide, a second inclined circular waveguide which is symmetrically arranged about the center of the round straight phase matching circular waveguide, and an output circular waveguide which is connected with the other end of the second inclined circular waveguide; wherein the centers of the input circular waveguide and the output circular waveguide are on the same axis. The invention realizes the complete conversion from the circular waveguide TM01 to the circular waveguide TE11 mode, outputs the microwave of the circular waveguide TE11 mode from the output end, and simultaneously ensures that the input waveguide and the output waveguide are positioned on the same axis.)

1. A coaxial mode converter is characterized by comprising an input circular waveguide (1), a first inclined circular waveguide (2) connected with the input circular waveguide (1) and arranged obliquely, a round straight phase matching circular waveguide (3) connected with the other end of the first inclined circular waveguide (2) and parallel to the input circular waveguide (1), a second inclined circular waveguide (4) arranged symmetrically about the center of the round straight phase matching circular waveguide (3), and an output circular waveguide (5) connected with the other end of the second inclined circular waveguide (4); wherein the centers of the input circular waveguide (1) and the output circular waveguide (5) are on the same axis.

2. The coaxial mode converter according to claim 1, wherein the diameters of the input circular waveguide (1), the first inclined circular waveguide (2), the straight circular phase-matching circular waveguide (3), the second inclined circular waveguide (4) and the output circular waveguide (5) are all 1.1 times of the wavelength of the input microwave.

3. A coaxial mode converter according to claim 1, characterized in that the first inclined circular waveguide (2) and the second inclined circular waveguide (4) form an acute angle of 20 ° with the horizontal axis of the input circular waveguide (1) and the output circular waveguide (5).

4. A coaxial mode converter according to claim 1, wherein the first inclined circular waveguide (2) and the second inclined circular waveguide (4) have a length of 3.0 times the wavelength of the input microwave.

5. A coaxial mode converter according to claim 1, wherein said circular straight phase-matched circular waveguide has a length of 1.6 times the wavelength of the input microwave.

6. A method of controlling the direction of polarisation of microwave radiation, characterised by using a coaxial mode converter according to any of claims 1 to 6, comprising the steps of:

(S1) mounting a selection joint for realizing dynamic vacuum on the input circular waveguide and the output circular waveguide;

(S2) fixing a high-power microwave generator for generating angularly symmetrical TM01 mode microwaves at one end of the input circular waveguide, and fixing a radiation horn at the output end of the output circular waveguide;

(S3) rotating the axial mode converter along the z-axis, the polarization direction of the microwave radiation is changed correspondingly with the rotation of the coaxial mode converter along the z-axis, thereby realizing the polarization direction control of the microwave radiation.

Technical Field

The invention relates to a microwave output structure of a vacuum microwave device, in particular to a coaxial mode converter and a microwave radiation control method applying the same.

Background

High-power microwave (HPM) is used as a novel electromagnetic interference means, mainly aims at various targets such as electronic reconnaissance, communication, synthetic aperture radar and the like to interfere and attack, and can degrade or damage a microwave sensor, so that the microwave sensor loses ground monitoring, and reconnaissance and imaging lose corresponding reconnaissance and warfare efficiency. Since the coaxial output has a wide-spectrum output characteristic and the operation mode of most HPM devices (such as MILO, BWO, RKA) is TM01 mode, the spatial radiation of this mode is a hollow beam, which is not good for the microwave to act on the target in practical application, and a special mode conversion structure is usually required to make the spatial radiation of the output microwave a solid beam. The existing mode converter is generally a snake-shaped (or S-shaped) mode converter, because an input waveguide and an output waveguide are not in the same axis, the difficulty of target collimation in practical use is increased, and although the polarization direction of output microwaves is parallel to the plane of the mode converter, the rotation of the mode converter can bring offset motion of the output waveguide and a corresponding radiation horn, and the polarization direction control of microwave radiation is limited.

Disclosure of Invention

The invention aims to provide a coaxial mode converter and a microwave radiation control method using the same, and mainly solves the problems that an input waveguide and an output waveguide of the conventional converter are not in the same axis, and the polarization direction of microwave radiation is difficult to control.

In order to achieve the purpose, the technical scheme adopted by the invention is as follows:

a coaxial mode converter includes an input circular waveguide, a first inclined circular waveguide connected to the input circular waveguide and disposed obliquely, a circular straight phase-matching circular waveguide connected to the other end of the first inclined circular waveguide and parallel to the input circular waveguide, a second inclined circular waveguide disposed symmetrically about the center of the circular straight phase-matching circular waveguide, and an output circular waveguide connected to the other end of the second inclined circular waveguide; wherein the centers of the input circular waveguide and the output circular waveguide are on the same axis.

Further, in the present invention, the diameters of the input circular waveguide, the first inclined circular waveguide, the straight circular phase-matched circular waveguide, the second inclined circular waveguide, and the output circular waveguide are all 1.1 times of the wavelength of the input microwave.

Further, in the present invention, the first inclined circular waveguide and the second inclined circular waveguide form an acute angle of 20 ° with a horizontal axis in which the input circular waveguide and the output circular waveguide are located.

Further, in the present invention, the lengths of the first inclined circular waveguide and the second inclined circular waveguide are 3.0 times of the wavelength of the input microwave.

Further, in the present invention, the length of the circular straight phase-matching circular waveguide is 1.6 times the wavelength of the input microwave.

Based on the coaxial mode converter, the invention also provides a method for controlling the polarization direction of microwave radiation, which comprises the following steps:

(S1) mounting a selection joint for realizing dynamic vacuum on the input circular waveguide and the output circular waveguide;

(S2) fixing a high-power microwave generator for generating angularly symmetrical TM01 mode microwaves at one end of the input circular waveguide, and fixing a radiation horn at the output end of the output circular waveguide;

(S3) rotating the axial mode converter along the z-axis, the polarization direction of the microwave radiation is changed correspondingly with the rotation of the coaxial mode converter along the z-axis, thereby realizing the polarization direction control of the microwave radiation.

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

(1) the invention inputs the microwave of the circular waveguide TM01 mode from the input circular waveguide end, and enters the coaxial mode converter, so that the TM01 mode microwave is gradually converted into the TE11 mode microwave in the first inclined circular waveguide, in the mode conversion process, a straight circular phase matching waveguide parallel to the input circular waveguide is installed at a proper position, the phase matching relation in the mode conversion process is changed to adapt to the mode conversion process to continue to be carried out in the second inclined circular waveguide until the mode conversion is completed at a required position, the complete conversion of the circular waveguide TM01 to the circular waveguide TE11 mode is realized, the microwave of the circular waveguide TE11 mode is output from the output end, and meanwhile, the input waveguide and the output waveguide are ensured to be in the same axis.

(2) When the microwave radiation polarization direction control device is used, the selection joint for realizing dynamic vacuum is arranged at the input waveguide and the output waveguide, although the high-power microwave generator and the radiation horn are fixed, the coaxial mode converter can still rotate along the z axis mechanically, the microwave generated by the high-power microwave generator is TM01 mode, the angle is symmetrical, and the polarization direction of the radiation microwave is correspondingly changed along with the rotation of the coaxial mode converter along the z axis, so that the polarization direction control of the microwave radiation can be realized.

Drawings

Fig. 1 is a schematic structural diagram of a coaxial mode converter according to the present invention.

Fig. 2 is a schematic structural diagram of a use state of the coaxial mode converter according to the present invention.

Fig. 3 is a diagram showing the distribution of the microwave electric field (Ey) in the coaxial mode converter of the present invention.

Fig. 4 is a radiation pattern within the coaxial mode converter of the present invention.

Wherein, the names corresponding to the reference numbers are:

1-input circular waveguide, 2-first inclined circular waveguide, 3-circular straight phase matching circular waveguide, 4-second inclined circular waveguide, 5-output circular waveguide, 6-selective joint, 7-high power microwave generator and 8-radiation horn.

Detailed Description

The present invention will be further described with reference to the following description and examples, which include but are not limited to the following examples.

Examples

As shown in fig. 1 to 4, the coaxial mode converter disclosed in the present invention includes an input circular waveguide 1, a first inclined circular waveguide 2 connected to the input circular waveguide 1 and disposed obliquely, a circular straight phase-matching circular waveguide 3 connected to the other end of the first inclined circular waveguide 2 and parallel to the input circular waveguide 1, a second inclined circular waveguide 4 disposed symmetrically with respect to the center of the circular straight phase-matching circular waveguide 3, and an output circular waveguide 5 connected to the other end of the second inclined circular waveguide 4; wherein, the centers of the input circular waveguide 1 and the output circular waveguide 5 are on the same axis.

The diameters of the input circular waveguide 1, the first inclined circular waveguide 2, the circular straight phase matching circular waveguide 3, the second inclined circular waveguide 4 and the output circular waveguide 5 are all 1.1 +/-0.1 times of the wavelength of input microwaves. The acute angle formed by the first inclined circular waveguide 2 and the second inclined circular waveguide 4 and the horizontal axis of the input circular waveguide 1 and the output circular waveguide 5 is 20 +/-0.1 degrees. The lengths of the first inclined circular waveguide 2 and the second inclined circular waveguide 4 are 3.0 +/-0.1 times of the wavelength of input microwaves. The length of the circular straight phase matching circular 3 waveguide is 1.60 +/-0.1 times of the wavelength of input microwaves.

When the microwave-assisted coaxial waveguide is used, microwaves in a circular waveguide TM01 mode are input from an input circular waveguide end and enter a coaxial mode converter, the TM01 mode microwaves are gradually converted into TE11 mode microwaves in a first inclined circular waveguide, in the mode conversion process, the phase matching circular waveguide changes the phase matching relation in the mode conversion process so as to adapt to the mode conversion process to continue in a second inclined circular waveguide until the mode conversion is completed at a required position, the complete conversion from the circular waveguide TM01 to the circular waveguide TE11 mode is realized, the microwaves in the circular waveguide TE11 mode are output from an output end, and meanwhile, the input waveguide and the output waveguide are ensured to be positioned on the same axis.

Meanwhile, a selection joint 6 for realizing moving vacuum is arranged at the input and output circular waveguides, although the high-power microwave generator 7 and the radiation horn 8 are fixed, the coaxial mode converter can still rotate along the z axis mechanically, the microwave generated by the high-power microwave generator is TM01 mode, the angle is symmetrical, and the polarization direction of the radiation microwave is correspondingly changed along with the rotation of the coaxial mode converter along the z axis, so that the polarization direction control of the microwave radiation can be realized. Therefore, compared with the prior art, the invention has outstanding substantive features and remarkable progress.

The above-mentioned embodiment is only one of the preferred embodiments of the present invention, and should not be used to limit the scope of the present invention, but all the insubstantial modifications or changes made within the spirit and scope of the main design of the present invention, which still solve the technical problems consistent with the present invention, should be included in the scope of the present invention.