基于多层方环模型的低通高阻频选结构设计方法

Design Method of Low Pass High Resistance Frequency Selective Structure Based on Multilayer Square Ring Model

作为一种性能优异的空间滤波装置,频率选择表面(结构)被广泛应用于隐身天线罩设计之中。提出一种基于多层方环模型的低通高阻频选结构设计方法,整体模型由三层带阻方环结构和空气隔层构成,多层结构可以在极大展宽阻带带宽的同时保证较低的透波插损。计算和仿真结果表明,所设计的频选结构能够在1~6 GHz实现至多1 dB的低频插损,同时保证在8~18 GHz实现至少10 dB的高频插损(90%以上反射)。

As a spatial filtering device with excellent performance,frequency selective surfaces(structures)are widely used in the design of stealth radomes.A design method of low pass and high resistance frequency selective structure based on multilayer square ring model is proposed.The overall model consists of a three-layer square ring structure with resistance and an air barrier layer.Multilayer structure can greatly broaden the stopband bandwidth while ensuring low penetration insertion loss.The calculation and simulation results show that the designed frequency selective structure can achieve a low frequency insertion loss of up to 1 dB at 1~6 GHz.At the same time,it is ensured to achieve at least 10 dB of high-frequency insertion loss(over 90%reflection)at 8~18 GHz.