A Compact Octagon Slotted Circular UWB Antenna for RF Energy Harvesting

As the demand of power is raising day to day, the dependency on alternate energy sources is also increasing. Abundant RF energy is available in the nature 24\times 7 in the form of radiation from various RF sources. Designing a miniaturized wideband or multiband antenna with good performance to capture this RF energy is need of the hour. This paper presents a compact octagon slotted circular Ultra Wide Band (UWB) antenna for RF energy harvesting. It achieves less than 10dB return loss characteristics in the frequencies ranging from 1.73GHz to 12.73GHz, which includes 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. This antenna gains an impedance bandwidth of 11GHz, maximum radiation efficiency of 98% at 1.78GHz and highest peak gain of 4.47dBi at 11.5GHz. It is printed on FR4 substrate of dimensions 36mm\times 30mm\times 1.6mm. The fabricated antenna is tested with VNA. The simulated and measured return loss results are compared and show good agreement.