Development of rectenna with high impedance and high Q antenna

Rectenna, rectifying antenna, is one of key technologies of a wireless power transfer and an energy harvesting from broadcasting waves. The rectenna is composed of an antenna and a rectifying circuit with diodes to convert radio frequency (RF), for example, GHz band, to direct current (DC). The RF-DC conversion efficiency of the rectenna is decided by characteristics of the diode, especially voltage-current characteristics of the diode. When voltage in the diode is low, which means low input RF power, the RF-DC conversion efficiency is low. We propose that an antenna of the rectenna with high impedance and high Q is used for increasing the voltage in the diode. This paper presents new approach of development of high RF-DC conversion efficiency rectenna with high impedance and high Q antenna.