A Wideband Fractal Planar Monopole Antenna with a Thin Slot on Radiating Stub for Radio Frequency Energy Harvesting Applications

In this paper, for energy harvesting applications a design of a wideband planar monopole antenna is proposed using fractal geometry and inserting a thin slot on radiation patch. the proposed antenna is optimized at various stages during its design. moreover, a parametric study is done for understanding sensitivity of important design parameters in the design process of the antenna. the designed antenna operates at 10-db impedance bandwidth from 0.92 to 2.58 ghz (fractional bandwidth of 95%) with low profile structure and compact size of 65 × 65 × 0.8 mm^3, acceptable return losses, stable radiation characterizes and reasonable gains. a potential application of the antenna as a receiving antenna for harvesting systems has been carried out inside the laboratory as the harvested power from ambient radio-frequency (rf) energy. this wideband antenna has a good potential to harvest rf energy of available signals in the gsm-900, gsm-1800, and wi-fi bands, and can be used as a part in dc power supply modules of low power sensor networks.