A UWB Monopole Antenna Design based RF Energy Harvesting Technology

In this paper, an Ultra-Wide-Band (UWB) printed monopole antenna based Hard Surface (HS) is proposed for RF energy harvesting to serve the application of the Internet of Things (IoT). The proposed antenna is constructed of a monopole of an open mouth flower patch mounted on an FR4 substrate and followed by an HS array. The antenna is backed with a partial ground plane to enhance the antenna bandwidth. The stability in the antenna radiation pattern over the entire frequency band is achieved by introducing three rows of the proposed HS based on H-Resonators (HS-HR) next to the patch edge. Such arrays provide an Omni directional antenna at several frequency bands that suit the application of RF energy harvesting. The array of the proposed HS-HR provides high electromagnetic impedance within the frequency band of interest toward the patch length. Numerical simulations are accompanied using CST MWS and HFSS software packages to evaluate the antenna performance. Finally, the related measurements to the antenna performance and RF harvesting are conducted at 2.45GHz. It is found that the proposed antenna provides a conversion efficiency of 35% with an acceptable gain-bandwidth product.