力对开孔型频率选择表面电磁性能的影响(英文)

Influence of Force on the Electromagnetic Property of FSS with Apertures

频率选择表面(FSS)被广泛用于各个领域。很多情况下,频率选择表面会受到外力的作用,例如:嵌在集成桅杆外壳或者雷达吸波-承载复合材料结构中的频率选择表面。文章研究了在力的作用下,频率选择表面的电磁性能是否会改变、如何改变。首先,分析了力影响频率选择表面电磁性能的机理;然后,使用力学有限元法和电磁学有限元法分析了不同大小、不同方向的力作用下,频率选择表面电磁性能改变的模式和大小。计算获得的电磁性能-力关系曲线显示:电磁性能的改变主要表现为电磁波响应频率的偏移和透射带宽的改变;在不同方向的力作用下,电磁性能的改变程度不一样。为了降低力对频率选择表面电磁性能的影响,在布置频率选择表面时,应使受力的方向避开频率选择表面的最敏感方向,同时带圆角的开孔型频率选择表面值得研究。

The frequency selective surface（FSS） is applied widely.In many circumstances,the FSS is subjected to all kinds of forces,such as the FSS embedded in the shell of integrated mast and microwave absorber structure.In this paper,a research is conducted to find out whether and how the electromagnetic property of FSS changes when the FSS is subjected to force.Firstly,an analysis is conducted on the mechanism of the influence of force on the electromagnetic property of FSS.Then,by using both mechanics finite element method and electromagnetics finite element method,an investigation is conducted to find out the pattern and magnitude of the change of FSS＇s EM property caused by forces various in direction and magnitude.The curve of EM property-force gotten shows：the change mainly lies in the excursion of the resonant frequency and the altering of the bandwidth;the sensitivity of EM property to the force alters greatly when the direction of force changes.In order to depress the influence of the force on the EM property,the disposal of the FSS should ensure the direction,in which the forces are loaded,to avoid the ones which may make greater influence occur;the FSS with round-cornered aperture is needed to be researched.