A Novel Circularly Polarized Multiple Elliptical Printed Monopole Antenna

A novel circularly polarized, broadband and high gain printed monopole antenna is proposed for RF energy harvesting. The antenna has an excellent impedance matching over a wide band which includes various frequencies bands such as GSM 1800 MHz, Wi-Fi 2400MHz and LTE 2500MHz. The antenna structure consists of multiple elliptical patches arranged in a circular fashion to enable the reception of ambient RF signals in different orientations. The simulation results of the designed antenna show that an axial ratio less than 3dB are maintained for frequencies ranging from 2.1GHz to 2.5GHz. The presented broadband antenna exhibits 10dB return loss bandwidth of 84% which is advantageous to accumulate the power over the multiple bands and increase the ambient RF input power density. The antenna has a gain more than 5.2dB over the entire band.