A Modified Circular Shaped Flexible UWB Antenna for Wireless Body Area Network

A conformal ultrawideband antenna of 25 × 25 mm
²
is proposed in this paper for wearable applications. A flexible polydimethylsiloxane (PDMS) substrate of thickness 1.4 mm is used to design this structure. The antenna consists of a modified elliptical geometry as the radiating part and a partial ground plane. To obtain wider bandwidth, two rectangular shape slots are etched in the ground surface. The antenna operates from 3.81-11.69 GHz with a peak gain of 8.2 dBi at 9.9 GHz. The proposed design shows good compatibility and impedance matching when bent along x and y axis. To study the effect of antenna’s radiation on human tissue Specific Absorption Rate (SAR) is analyzed. The SAR at 4.5 GHz are 0.785 and 0.308 W/kg for 1g and 10 g of tissue, respectively. The proposed antenna is suitable for Wireless Body Area Network (WBAN), wearable and IoT application.