Radar absorbing material with small wind surface and low insertion loss

Abstract

The invention discloses a radar absorbing material with small wind surface and low insertion loss, which comprises an upper substrate, an air matching layer and a lower layer arranged in sequence from up to down. The upper surface of the upper substrate is distributed by a windmill shaped lossy resonant structure; the upper surface of the lower substrate is distributed by a windmill shaped lossless frequency selection surface structure. The windmill shaped resonant structure or the frequency selection surface structure consists of an L type structure formed in such a manner as that each one end of four metal rods is connected in series from the start one to the last one with the center being distributed symmetrically in four directions. The lossy resonant structure is required to load resistors on the L type metal rods and has to be in parallel connection with inductors and capacitors. According to the invention, hollow processing is carried out at the coupling parts of adjacent parallel metal rods on the upper substrate and the lower substrate as well as at the central positions, which reduces the wind surface of the structure and the insertion loss of a transmission window. In addition, through the coupling between two layer structures, a transmission window with low insertion loss and two adjacent absorption narrow bands are generated, thus achieving the design goal of a radar absorbing material with small wind surface and low insertion loss.

Description

technical field [0001] The invention relates to a radar absorbing material, in particular to a radar absorbing material with small wind surface and low insertion loss, belonging to the technical field of radar absorbing materials. Background technique [0002] The radar absorbing material can be used as a radar radome installed in front of the antenna. The passband of the radome is consistent with the working frequency range of the antenna to transmit or receive electromagnetic wave signals. There are strong reflections on both sides of the passband of the traditional frequency selection surface, which seriously threatens the communication security. Reducing the strong reflection near the passband of the frequency selective surface can reduce the radar cross section of the platform, realize the low detectability of the platform, and improve the communication security. [0003] The existing radar absorbing materials usually design the passband at the low frequency end away f...

AI Technical Summary

Problems solved by technology

[0004] With the continuous improvement of radar performance requirements, the diameter of many large-scale high-performance radar radomes can reach more than 20m. In case of stormy weather, the radomes may be broken or even dismembered, causing great property losses. The reasons can be attributed to Insufficient mechanical properties of the wind-receiving surface of the radome

Images