Multiband asymmetric radio frequency to direct current converter circuit for wireless power transfer

摘要

This article presents the multiband asymmetric radio frequency (RF) to direct current (DC) converter circuit for the wireless power transfer (WPT) applications. The proposed circuit is composed of a power divider, novel asymmetric multiband matching circuit and RF Schottky diode quadrupler voltage rectifier circuit. Unlike the conventional narrow band quadrupler using two Greinacher cells with opposite polarities, the proposed circuit aims to cover the multifrequency bands, which are the cell phone 1.8-2.1 GHz, the industrial, scientific, and medical (ISM) bands 2.4-2.5 GHz and 5.725-5.875 GHz. The interested RF input power range of -10 to 20 dBm for the WPT application is focused. The measured RF-to-DC conversion efficiency (eta) of 50-65% at 1.8-2.1 GHz, 65% at 2.45 GHz and 16% at 5.8 GHz are obtained at 10 dBm optimal input power.