Microwave Rectifiers With Wide Output Load Range Based on Multiple Single-Stage Voltage Multipliers in Parallel

A multiple single-stage voltage multipliers in parallel is analyzed and proved theoretically to exhibit slowly changing input impedance with the wide load range in this letter. Based on this unique property, a low-power microwave rectifier consisting of two (which is the optimal number) single-stage voltage multipliers in parallel is designed, fabricated, and measured for different output load, which showed a good characteristics in both efficiency and load range, and kept power conversion efficiency (PCE) higher than 60% from 3 to 20 k
$\Omega$
, in good agreement with simulation results.