Influence of unidirectional tensile external-loading on electromagnetic property of the perforated frequency selective surface illuminated by electromagnetic wave incident at arbitrary angles

Abstract

That whether unidirectional tension changes the influence of incident angle on FSS’s (frequency selective surface) electromagnetic (EM) property and whether incident angle changes the effect of unidirectional intension on FSS’s EM property is researched. The pattern and magnitude of these changes are revealed. Firstly, the analyses for the mechanism of unidirectional tension’s influence and the mechanism of the coupling between the influences of unidirectional tension and incident angle are conducted. Then, according to the mechanism of these influences, Mechanics-Electromagnetics co-analysis is conducted based on mechanics finite element method and electromagnetics finite element method. The frequency responses of the FSS which is under different unidirectional tensions and illuminated by EM wave incident at different angles are gained. The concept “unidirectional tensile sensitivity of FSS” is put forward along with two unidirectional tensile sensitivity factors. By using angular sensitivity-factor and unidirectional tensile sensitivity-factor, the influences of unidirectional tension and incident angle, which are coupled with each other, are expatiated respectively. Research results show that these influences have two sides. Meanwhile, basing on Mode Matching Method and according to the results of numerical investigation, one principle for the layout of FSS with apertures is gained. Several suggestions for further research are given.