rf power harvester using a broadband monopole antenna and a quad-band rectifier

An rf energy harvester (rectenna) consists of a broadband monopole antenna and a quad-band rectifying circuit is designed to harvest em wave energy in the frequency range of 1.412 ghz to 8.56 ghz, which covers gsm-1800, lte-band, wimax, wi-fi, and wlan. the initial component of the rectenna is an antenna that includes a semi-circular radiating patch with 8 circular stubs and a semicircle ground plane. the simulation results show the antenna has −10 db impedance bandwidth at 7.148 ghz (from 1.412 ghz to 8.56 ghz). the second part of the rectenna is a rectifier circuit with a quad-band matching network for rf to dc conversion. the rectifier benefits from a two-stage dickson rectifier using schottky diodes. the rf-dc conversion efficiency and output dc voltage are simulated, and the maximum output voltage of the rectifier is 7.2 v with the optimum load resistance of 𝑅=12 𝑘𝛺 and the peak conversion efficiency is 65.3%, when the input power of the rectifier is set -4 dbm at 1.71 ghz.