High-power microwave mode-conversion antenna based on diffraction period structure

Abstract

The invention discloses a high-power microwave mode-conversion antenna based on a diffraction period structure and belongs to the technical field of microwave antennas. The antenna is composed of a primary feed source and an antenna array surface, wherein the primary feed source is a mode exciter capable of generating a symmetrical mode of a rotary shaft and the antenna array surface is subjectedto feeding by adopting a positive feedback manner; the antenna array surface is formed by periodically arraying a plurality of transmitting units formed by overlapping a plurality of layers of slottedmetal thin plates up and down. According to the antenna disclosed by the invention, the metal thin plates with slotted lines are used as the antenna array surface; compared with a traditional microstrip array antenna, the antenna has the advantage that the power capacity is greatly improved; the symmetrical mode of any rotary shaft can be converted into a single linear polarization mode, so thatthe antenna has a wide application field; the antenna also has the advantages of high gains, low sections, simple structure, easiness for processing and the like.

Description

technical field [0001] The invention belongs to the technical field of microwave antennas, in particular to a high-power microwave mode-to-mode antenna based on a diffraction periodic structure. Background technique [0002] High-power microwave refers to electromagnetic waves whose pulse peak power is above 100MW and frequency is in the range of 0.5-300GHz. Due to its own remarkable characteristics and advantages, high-power microwave technology has developed rapidly in recent years. fields are showing great promise. The high power microwave source is one of the core devices in the high power microwave system. Most high-power microwave sources have rotationally symmetric output structures, so the modes they generate are mostly rotationally axisymmetric. For example, relativistic klystrons with coaxial extraction output coaxial TEM modes, while relativistic return wave tubes with axial extraction output circular waveguide TM 01 mold. Either TEM or TM 01 Mode, because th...

AI Technical Summary

Problems solved by technology

However, the radiation direction of the above-mentioned Vlasov mode conversion antenna changes with the frequency, and the angle with the axis is relatively large, which cannot meet the requirement that the microwave output is still along the axis, and the application range is limited.

[0005] In 2017, Zhao Jianing and others proposed in the patent "A New Type of Mode Switching Antenna Based on Planar Structure" (Application No.: CN201710219562.9, Application Date: 2017.04.06, Application Publication Date: 2017.08.11, Publication No.: CN107039781A) A planar reflectarray mode conversion antenna, which can realize arbitrary adjustment of the unit phase, but the disadvantage is that there is a feed source shielding, and the use of a medium as the unit substrate is prone to dielectric loss and dielectric breakdown, which is not conducive to high-power microwave application

[0006] In short, the mode converters currently used generally have problems such as low aperture efficiency, large volume, and limited application range.

Images