通带可重构的吸波/透波一体化频率选择表面研究

In view of the stealthy demand for the antennas of frequency-agility-radar, a design method of absorptive/ transmissive frequency selective surface (ATFSS) with reconfigurable transmission band is proposed in this project. ATFSS is a kind of multi-layer integrated periodic structure, which is transmissive at the operation band while becomes absorptive at other bands. ATFSS has great significance on the development of antenna stealthy technology. However, for a designed ATFSS structure, its absorptive/ transmissive property becomes unchanged, which cannot respond to the change of external electromagnetic environment. To solve this problem, we introduce active tunable devices in the design of ATFSS to realize the ATFSS with reconfigurable transmission band. In this project, we will construct equivalent circuit model for the ATFSS loaded with active devices, analyze the regulation mechanism of the active devices and the influence of their parasitic parameters on the performance in the reconfigurable transmission band, propose optimization method on the in-band insertion loss, design the unit cell structure of the reconfigurable ATFSS and validate its performance by experimental measurement.

针对频率捷变雷达的天线隐身需求，提出一种通带可重构的吸波/透波一体化频率选择表面（ATFSS）设计方法。ATFSS是一种具有带外吸波/带内透波特性的多层复合周期结构，对天线隐身技术的发展具有重要意义。但是设计定型的ATFSS带外吸波与带内透波特性均已确定，不能随外部电磁环境变化做出相应的响应。本项目拟在ATFSS单元结构中引入有源可调器件实现ATFSS的通带可重构设计。本项目对加载有源器件的ATFSS结构建立等效电路模型，深入分析有源器件的调控机理及其寄生参数对可重构通带的影响并提出插损优化方法，完成可重构ATFSS结构设计，并进行实验验证。

项目针对频率捷变雷达系统的天线隐身需求，提出了通带可重构的吸波透波一体化频率选择表面（ATFSS）理论和设计方法，能实现对所需的带内信号的低插损透过、而对其它频带信号产生宽带吸收，通过在ATFSS单元结构中引入PIN二极管和变容二极管等有源可调器件，实现了通带可切换和通带连续可调的ATFSS设计，分析揭示了有源可调器件对透波频带插损的影响，提出了有效降低透波插损的设计方法，设计并制备了多款具有宽带带外吸波和低插损可重构透波特性的ATFSS结构样件。