Antenna absorption efficiency and beam efficiency of a microwave power transmission system

Efficiency is one of the most important parameters in a microwave power transfer system. We proposed a wireless charging system for an electric truck via microwaves. Here we studied the antenna absorption efficiency of a finite receiving array antenna and the beam efficiency between a transmitting and receiving array antenna using finite-difference time-domain (FDTD) simulations. The antenna absorption efficiency of a finite receiving array antenna reaches 95.1% with a matched optimum load and the beam efficiency reaches 99.9% using a Gaussian beam with an optimum focal point.