High efficiency mw-band dielectric resonator rectenna using distributed capacitors

Abstract

This paper presents experimental studies on the improvement of RF-DC conversion efficiency of the rectenna using a high Q λ/4-coaxial dielectric resonator and distributed capacitors at 850 MHz. In order to achieve an ultimate efficiency, we have constructed a rectenna using both a coaxial dielectric resonator and a film capacitor. The measured results show that the developed rectenna has an RF-DC conversion efficiency of 76.2% and 44.1% at a low input power of 1 mW and 0.1 mW that achieves the 20%-efficiency improvement compared with the rectenna with an LC resonator.