基于有源频率选择表面的多功能吸波器设计

Design of Multifunctional Microwave Absorber Based on Active Frequency Selective Surface

在微波电路和传输线理论的基础上,设计了一种多层结构的基于有源频率选择表面的多功能吸波器,其结构分为四层:上层由金属贴片和PIN二极管组成,第二层为介质板,中间层为金属板,最下层为微带馈电结构。该设计通过调节馈电方式来控制PIN二极管通断两种工作状态,从而改变上层金属贴片的组成结构,实现了双频段频率可调。仿真结果表明:所设计的多功能吸波器可调频段范围峰值为8.95~15.32 GHz,且具有极化转换特性,实现了吸波频率的可调,为多功能吸波器的设计提供了新的思路。

Based on the theory of microwave circuit and transmission line,a multi-layer multifunctional microwave absorber based on active frequency selective surface is designed.The structure has four layers.The upper layer is composed of metal patch and PIN diode,the second layer is dielectric plate,the middle layer is metal plate,and the lowest layer is microstrip feed structure.The design controls the on-off two working states of PIN diode by adjusting the feeding mode,so as to change the composition structure of the upper metal patch and realize the dual band frequency adjustment.The simulation results show that the peak value of the adjustable frequency band of the designed multifunctional microwave absorber is 8.95~15.32 GHz,and it has the characteristics of polarization conversion.The adjustable absorption frequency is realized,which provides a new idea for the design of multifunctional microwave absorber.