Optimized Transmitting Sources for Radiative-Wireless Power Transmission with Lossy Media

This paper presents a method for the theoretical analysis of the radiative-wireless power transmission (R-WPT) in lossy environments. We identified the efficiency bounds for specific receiver antennas when the available transmission area was limited. In addition, the optimal transmission currents were obtained and used to determine the proper location and polarization of the transmitting array. It was found that the fields emitted from the receiver in the transmitting mode are an important factor for determining the efficiency bound. To understand the R-WPT with lossy media better, the proposed theoretical framework was applied to two examples. The efficiency bounds for the examples were compared with the results obtained by using previous works to assess the usability of the proposed theory. This study could serve as a basis for the development of R-WPT systems for practical microwave transmission applications with lossy objects.