A Broadband Rectifier with High Power Conversion Efficiency and High Power Handling Capability for Microwave Power Transfer Applications

Microwave power transfer (MPT) is the technique to transfer radio-frequency (RF) energy from one place to another place without using wire in the form of microwave signals. At the receiver end, an antenna circuit is needed to receive the signal. A circuit known as a rectifier is also needed to convert this received microwave energy into DC energy to store. The conversion takes place using a nonlinear rectifying device called a Schottky diode. In this work, a broadband rectifier with a high power conversion efficiency and high-power handling capability is reported. For this purpose, a Schottky diode having a 15V breakdown voltage has been chosen. The rectifier covers the GSM 1.8, LTE 2.1, and Wi-Fi 2.45 GHz bands. The rectifier has a sensitivity of -10 dBm and has power conversion efficiency (PCE) greater than 65% from 1.73 to 2.65 GHz at a 20 dBm input power level. The PCE exceeds 60% from 1.645 to 2.54 GHz at 13 dBm. The maximum PCE reached 78.4% at 2.47 GHz at 20 dBm input power.