摘要
采用芳纶纸蜂窝与有耗频率选择表面复合设计兼具重量轻、强度高及吸波带宽宽的蜂窝吸波复合材料,研究了蜂窝吸波复合材料中蜂窝的厚度和有耗频率选择表面对结构电磁性能的影响。用等效电路法分析了传统孔径型方环有耗频率选择表面的电磁波吸收原理及该结构在宽频电磁吸收方面的缺陷。使用开槽的方法增大该结构等效电容的作用,在保持高频吸收性能基本不变的情况下增大了低频吸收峰,改进了结构的低频吸收性能,使吸波带宽展宽1倍以上。通过matlab计算出等效电容和等效电感,结果表明:方环形有耗频率选择表面的环宽度只改变等效电感的大小,等效电容保持不变;等效电感的大小主要影响高频吸收峰位,等效电容的大小主要影响低频吸收峰位。蜂窝厚度主要影响低频吸收峰值和高频吸收峰位。基于以上特性设计出具有宽频电磁波吸收性能、厚度为6 mm的蜂窝夹芯结构吸波材料:在6 mm蜂窝介质表面覆盖开槽方环形有耗频率选择表面,最下面为金属反射层,其-10 d B的电磁波吸收带宽达到14 GHz。测试结果与设计结果基本一致。
The honeycomb absorbing composites with light weight, high strength and broadband absorbing property had been designed by combination of aramid honeycomb and lossy frequency selective surface composite. The effect of the thickness of honeycomb and the configuration of lossy frequency selective surface on electromagnetic performance was investigated, while the electromagnetic absorbing principle of the lossy frequency selective surface with traditional aperture was analyzed by the equivalent circuit method, and of which the deficiency in broadband absorbing was also proposed. In order to resolve the structure with none equivalent capacitance, slots were made on the lossy frequency selective surface with traditional aperture. Consequently, there have been another absorption peak in low frequency, and the high frequency absorption performance kept unchanged. Correspondingly the low frequency absorption performance was greatly improved, thus the whole absorbing performance of the very configuration was greatly improved, and the absorbing bandwidth had been broadened more than one time.Through calculating the equivalent capacitance and inductance by matlab, it follows that as the width of square ring changed,the equivalent inductance varied accordingly,but the equivalent capacitance remain unchanged; The high frequency absorption peaks were mainly affected by the equivalent inductance, and the low frequency absorption peaks were mainly affected by the equivalent capacitance. The thickness of honeycomb mainly affected the low frequency absorption peak and the position of high frequency absorption peak. According to the above characteristics, a thickness of 6 mm broadband honeycomb absorbing composites had been designed with the slotted lossy frequency selective surface in front of the honeycomb medium, which presented an absorbing bandwidth 14 GHz of-10 d B. The actual test result basically accorded with the design expectation.
作者
陈育秋
祖亚培
宫骏
孙超
王晨
CHEN Yuqiu;ZU Yapei;GONG Jun;SUN Chao;WANG Chen(Institute of Metal Research,Chinese Academy of Sciences,Shenyang 110016,China;University of Chinese Academy of Sciences,Beijing 100049,China;Altair Engineering Software（Shanghai）Co.Ltd.,Shanghai 200436,China)
出处
《材料研究学报》
EI
CAS
CSCD
北大核心
2018年第8期567-574,共8页
Chinese Journal of Materials Research
关键词
金属材料
蜂窝吸波复合材料
电磁性能
有耗FSS
等效电感
等效电容
metallic materials
microwave absorbing honeycomb composites
electromagnetic prop-erty
loss FSS
equivalent inductance
equivalent capacitance
