An RF energy harvesting system using a gap
coupled microstrip antenna, designed and fabricated for 2.67
and 5.8GHz, is presented in this paper. Gain of 8.6dB and
bandwidth of 100MHz has been achieved for antenna at
2.67GHz. A gain of 9dB and bandwidth of 690MHz is obtained
for antenna at 5.8GHz. A CMOS rectifier topology designed in
UMC 180nm CMOS process and working at 2.6 GHz is also
presented. This topology works without any external bias circuit.
Rectified voltage of 1.04V at 1MΏ load with 5-stage rectifier is
achieved. Measured results of rectenna using Schottky diode at
2.67 and 5.8GHz are also presented.