Abstract
In this paper, design and analysis of a flexible antenna backed with Frequency Selective Surface (FSS) is presented for wireless body area communications. Textile based compact monopole antenna (50.5 × 38 mm2) is backed with a modified square loop FSS textile based superstrate (120 × 120 mm2), to improve the wearable antenna’s performance in terms of SAR reduction and gain enhancement. Modified square shaped monopole radiator with a rectangular slit defected ground structure provides the radiation of the 2.45 GHz ISM band with a bandwidth (S11 ≤ −10 dB) of 2.075 to 2.625 GHz. The bending analysis of antenna is also investigated in operating frequency band. Achiral FSS provides gradual increment in inductance and stable performance at both TE and TM polarization for oblique incidence of signals up to 60°. The proposed antenna system with the FSS, yields the fractional bandwidth of 22.44% and peak gain of 7.76 dBi with the dimensions of 120 × 120 × 30 mm3. The inclusion of FSS, reduces the back radiation there by decrease in SAR level is achieved from 3.197 W/kg to 0.164 W/kg. The reduced SAR value and its stable frequency performance over flexed conditions, ensures that the proposed system is a suitable entrant for wearable applications.
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