Voltage, efficiency calculation and measurement of low power rectenna rectifying circuit

In this paper, we present zero-bias Schottky diode and rectifier circuit models for a low power (/spl les/ 0 dBm) rectenna rectifying circuit. These models rely primarily on data obtained from the diode characteristic curve measurement. The zero-bias Schottky diode model provides diode parameters at the desired output DC current level to be matched with the antenna so that optimum power transfer from the antenna to the diode takes place. The rectifier circuit model provides an equivalent circuit model for the rectenna rectifying circuit to calculate RF to DC conversion efficiency at the desired output DC current level.