基于新型频率选择性吸收体的天线RCS缩减技术研究

Antenna stealth is very important for improving the combat capability and viability of weapon system. With the wide application of multi-system and multi-function microwave systems, it brings a lot of challenges to traditional stealth methods. This project will aim at the researches on the RCS reduction technology of an antenna based on frequency selective absorber. Firstly, the proposal of novel frequency selective absorber, and its related high performance and multi-functional analysis and design method, are carried out. Secondly, working principles of finite frequency selective absorber under near field of antenna are analyzed. Thirdly, via combination of different types of antennas, investigation on the antenna’s RCS reduction technology based on frequency selective absorber. Moreover, Some techniques like integration & re-usage and aperiodicity will be explored to enhance the antenna radiation performance and achieve high efficiency stealth. The research outputs from this project are expected to provide some useful guidelines to resolve the technological difficulties of traditional absorbers through the design of frequency selective absorber and the reduction of antenna RCS.

天线的隐身对于提高武器系统的战斗能力、生存能力至关重要。随着多体制、多功能微波系统的广泛应用，对传统隐身方法带来极大地挑战。本项目拟开展基于新型频率选择性吸收体的天线RCS缩减技术的研究，主要研究内容包括：提出新型的频率选择性吸收体，研究高性能、多功能吸收体的分析及设计方法；分析天线近场下有限大频率选择性吸收体的工作机理；结合多种形式的天线，研究基于频率选择性吸收体的天线RCS缩减技术，探索集成复用技术和非周期技术，以提高天线辐射性能且实现高效率隐身。本项目的研究，希望可以突破传统吸收体的技术难点，为频率选择性吸收体的设计及天线RCS缩减提供有效的指导。

本研究围绕天线隐身的问题，研究新型频率选择性吸收体的理论与技术。探索了新型的频率选择性吸收体，并提出宽带（相对带宽>100%）、低剖面（厚度< 0.1倍波长）、斜入射稳定（入射角>45度）的频率选择性吸收体的设计方法。并将吸收体作为天线罩/天线地板，以平面贴片天线阵列为例，实现天线的高效率隐身，即雷达散射截面的缩减。