Wireless power transfer system prototype with a wide input power range rectifier and power‐optimized waveforms

Abstract

This paper describes a wireless power transfer (WPT) system operating at 2.4 GHz, which is based on waveform optimization technique and a wide input power range rectifier. This latter consists of an RF-to-dc power conversion circuit based on circulators. The waveform optimization is then applied in order to enhance the power conversion efficiency at very low input power levels. The proposed WPT system was prototyped and tested in open and closed loop configurations with different types of obstacles placed between the transmitter and the receiver. The generation of power-optimized waveforms and the control process in the closed loop configuration were carried out using software-defined radio. The obtained experimental results validate the wide input power behavior of the two proposed WPT systems especially when dealing with very low input power levels and relatively dynamic environments. In fact, for the two WPT systems featured a distance of 1 m and a transmitted power of 50mw, dc power levels of about 38 and 11 μW are harvested in the cases of no obstacle and low attenuation obstacle respectively.

Time‐modulated multi‐tone antenna array for wireless information and power transfer

“…The rectifier diodes are connected in series in a voltage doubler rectenna and shunt to feed antenna for efficient harvesting 11 . Additional research on rectifier analysis with varied RF signal receiving modulation is undertaken in Kim et al 12 A rectenna with adequate PCE functioning at quad bands operatable at GSM, WLAN, and WiMAX is presented in Mirzababaee et al 13 Working of rectenna in open‐loop and closed‐loop configuration over a wide range of power input, where closed loop configuration performs better, however, it has a practical implementation challenge 14 . Applied wave research (AWR), an analytical analysis employing a microstrip antenna as feeding for RF energy, is being carried out for practical viability on rectenna 15 .…”