Low frequency rectenna system for wireless charging

Abstract

A human safe wireless charging system using a circularly polarized source antenna that can radiate in either a hemispherical pattern or directional cardiod-like patterns at a 40-50, 150, or 200 MHz frequencies to a receiving loop antenna which is coupled to a parasitic receive element.

1 . A wireless charging system using radio frequency (RF) power transmission frequencies below 200 MHz and at human safe power levels comprising;
 a circularly polarized transmit antenna to provide both hemispherical coverage and directional cardiod coverage patterns; and   a receive parasitic loop element coupled to a loop antenna in a battery enabled device.