Design and fabrication of a fabric for electromagnetic filtering application (experimental and modeling analysis)

Abstract

In this paper, a fabric with frequency selective surface (FSS) characteristics was developed for shielding of GSM-1800 frequency band global system for mobile communications (GSM). For modeling, two types of patch FSS models were developed through numerically solving the Maxwell’s equations using the Finite Integral Technique (FIT) method. In experiments an FSS fabric was developed by the embroidery method and a setup was prepared for evaluation of the shielding properties of the FSS fabric. Comparison of the results in 1805–1880 MHz frequency band showed a good agreement between resonance frequency responses of the model II and embroidery FSS fabric. The resonant frequency of the fabric was found to be less than that of the model I. However, the transmission and reflection coefficients of models I, II were same to each other. Results showed that in different incident angles, the frequency responses of the models I and II were not the same. However, the FSS fabric and model II were insensitive to such variations at 1805 MHz. Based on the numerical solution and the experimental results, this type of low-loss FSS fabric structure showed desired electromagnetic wave blocking properties in the desired bandwidth of 1805–1880 MHz.

Keywords:

• EMI shielding fabric
• electromagnetic textile
• numerical modeling
• FSS structure
• band width