基于单元阵列结构的聚合物基吸波器件的设计

Design of Polymer-based Absorbing Devices Based on Unit Array Structure

近年来,随着科技水平飞速提高,电磁波在各个领域广泛应用。而电磁防护成为军事及核电领域重点研究对象。如何吸收电磁波从而减少暴露风险成为了现代科学研究的重大课题之一。本文结合电磁防护领域的相关理论及几何学的设计方法使用新型高分子材料设计了一种新型的双层频率选择表面,采用PLA作为介质基底,聚合物基导电复合材料作为贴片设计的频率选择表面。经仿真分析发现:相较于传统材料,聚合物基吸波器件的中心谐振频率更高,且其电磁参数在一定范围内可调,可以更好地实现吸波效果;相较于其他影响因素(FSS单元尺寸,导电复合材料电导率),PLA层的电容率(即相对介电常数实部)对中心谐振频率影响更大,当相对介电常数实部在1.6~3.2范围内增加时,其中心谐振频率明显向低频移动,最大吸波率也随之增加。最终经仿真分析得到采用无分形的缝隙型五边形环状结构的聚合物基吸波器件设计参数。

Recent years,with the rapid improvement of science and technology level,electromagnetic wave has been widely used in various fields.How to absorb electromagnetic waves to reduce the risk of aircraft exposure has become one of the major issues of modern scientific research.In this paper,we design a new type of frequency selection surface using new polymer material,using PLA as the dielectric substrate and polymer-based conductive composite as the frequency selection surface of patch design.Through simulation analysis,it is found that:compared with traditional materials,the central resonance frequency of polymer-based absorbing devices is higher,and their electromagnetic parameters can be adjusted within a certain range,which can achieve the absorption effect better;Compared with other influencing factors(FSS cell size,conductive plastic conductivity),the PLA layer(namely,the relative dielectric constant)has a greater influence on the central resonance frequency.When the relative dielectric constant increases in the range of 1.6~3.2,the central resonant frequency moves significantly to the low frequency,and the maximum absorption rate also increases.The design parameters of the circular structure of the structure are obtained.