Circularly Polarized Antenna for ISM (5.8 GHz), Satellite Communications and UWB Applications

A compact and dual-band circularly polarized antenna with resonant frequency of 5.8GHz(ISM) and 7.6 GHz is proposed for biomedical, satellite and specific UWB applications. The 10 dB impedance bandwidth (IBW) of the antenna varies from 5.55 GHz to 5.94 GHz and 6.78 GHz to 8.78 GHz. The tilted arc-shaped radiator is used to perturb the current which is responsible for lower frequency band as well as circular polarization with the axial ratio extending from 5.77 GHz to 5.93 GHz, which covers 41% of the lower frequency band. The antenna is analyzed for wearable applications on a three-layer skin phantom model and the SAR value obtained is 0.2 W/Kg with Source power of 10mW, which is below the maximum permissible limit of 1.6W/Kg.