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.

在本文中，设计和分析了带有频率选择表面（FSS）的柔性天线，用于无线人体区域通信。基于纺织品的紧凑型单极天线（50.5×38 mm ²）带有改进的方形环FSS基于纺织品的上覆板（120×120 mm ^2）），以降低SAR和增强增益来改善可穿戴天线的性能。具有矩形缝隙缺陷接地结构的改进型方形单极辐射器可提供2.45 GHz ISM频段的辐射，其带宽（S11≤-10 dB）为2.075至2.625 GHz。天线的弯曲分析也在工作频带中进行了研究。非手性FSS可在TE和TM极化时提供逐渐增加的电感和稳定的性能，以使倾斜入射的信号达到60°。拟议的带有FSS的天线系统，其分频带宽为22.44％，峰值增益为7.76 dBi，尺寸为120×120×30 mm ³。包含FSS可以通过降低SAR值来减少那里的背向辐射，将其从3.197 W / kg降低到0.164 W / kg。降低的SAR值及其在弯曲条件下的稳定频率性能，确保了所提出的系统是可穿戴应用的合适进入者。