A Wideband CP Dipole Rectenna for RF Energy Harvesting

Abstract

A new wideband circularly polarized (CP) dipole rectenna is investigated for RF energy harvesting. We proposed a simple rectenna, which is composed of receiving antenna and rectifier. The receiving antenna has low profie structure, which is etched on a single substrate with metals on the upper and lower patches. By using off-center-fed (OCFD) dipole formed by symmetrical stubs, the bandwidth is improved. By simulating, the impedance bandwidth is 55.17% (3.36-5.92 GHz) and the bandwidth of 3-dB axial ratio(AR) is 27.94% (3.88-5.14 GHz). With simple structure of rectifier, the rectenna can afford to convert RF energy to DC with a maximum efficiency of 48.9%.