A Circular Slotted Planar Monopole UWB Antenna for RF Energy Harvesting Applications

Ultra Wide Band (UWB) is a buzzing word in recent times. This technology attracted researchers due to its features like less power consumption, low cost, high speed data transfer, multipath immunity, reliability, security, simultaneous ranging and communications. This paper discusses a planar UWB design which is printed on FR4 substrate of dimensions $49mm\times 35mm\times 1.6mm$. It achieves less than 10dB S11 in the frequencies starting from 1.51GHz to 12.5GHz, which covers the RF bands like GSM1800, DCS1800, GSM1900, PCS1900, UMTS2100, LTE2300, Wi-Fi, Bluetooth, ISM bands, LTE2600, FCC unlicensed UWB, WLAN, Wi- MAX3500, C-band, HIPERLAN and X-band. The antenna attains maximum efficiency of 97% at 1.78GHZ, highest peak gain of 4.2dBi at 7.78GHz with an impedance bandwidth of 10.99GHz. The printed prototype is tested by VNA, the measured S11 has good agreement with simulated return loss. This antenna is a good design for UWB applications like RF energy harvesting and spectrum sensing.