A Waveguide-Fed Transmitting Antenna for High Efficiency Microwave Power Transmission

In this paper, a transmitting antenna fed by rectangular waveguide are intend for the operation at relatively high power levels in practical use, such as mid-range wireless charging. The proposed transmitter is composed of square patches on a 1.5mm thick dielectric substrate. The square patches are connected by main feeder and excited by rectangular feeding patches in the middle of the antenna. Single antenna is fed by a rectangular waveguide and sized for 370×480 mm (14.6×18.9 inch). The transmitting antenna is investigated by simulation and experimentally. The simulated results indicated that this antenna achieves 30dB gain and 150MHz bandwidth from 5.74 to 5.89 GHz. Experimental results are in accordance with those of the simulation results. The electromagnetic field distributions of antenna radiation direction have been characterized both in horizontal and vertical sections. Further analysis of the power density of the improved transmitting antenna is given.