High Power and Wide Input Power Range Rectifying Metasurface with GaN Diode

A high power and wide input power range rectifying metasurface is proposed for wireless power transfer (WPT) in this paper. The proposed metasurface has a smaller size (50x50x2mm(3)), and its receiving efficiency is 83%. It has better incidence angle stability (0-75 degrees) than traditional receiving antennas. In addition, a high power and wide input power range rectifier circuit working at 5.8GHz is designed. The rectification efficiency of this circuit is more than 60% in the input power range from 28.8 dBm to 36 dBm, and the maximum rectification efficiency is 74% at the input power of 33dBm. In order to reduce the profile of WPT system, we integrate the rectifier circuit and the metasurface to carry out the WPT experiments. The dimension of the integrated rectifying metasurface is 50x50x3.5mm(3). When the input radio frequency (RF) power is 33 dBm, the rectifying metasurface can output direct current (DC) voltage is 25.52V, which is expected to supply power to high-power devices such as unmanned aerial vehicles (UAV) in the future.