A High Efficiency Millimeter Wave Rectenna Based on Interdigitated Capacitance

This paper present a rectifier antenna working at 26GHz, which consists of a millimeter-wave antenna, an input filter, an output filter and a parallel single-tube rectifier circuit. The input filter composed of interdigitated capacitance can effectively reduce the parasitic capacitance and improve the conversion efficiency, the fan-shaped output filter can suppress the fundamental wave and the second harmonic well. After processing test. the size of the proposed antenna is
$15\times 8\times 0.381\text{mm}$
and operating frequency is 26GHz. The transmission coefficient| S12| is close to −0.32dB, while reflection parameter| S11| is close to −20dB, when the input power is 20dBm, the receive power of load is 230 Ω, which means the efficiency of RF-DC is 61%.