The elimination of physical conductors as media for power transmission is an important step
towards reducing the bulk of waste material generated when electronic gadgets are …

In this paper, the efficiency of single-input multiple-output (SIMO) wireless power transfer
systems is examined. Closed-form solutions for the receiver loads that maximize either the …

A 3-D wireless charging system with spatial freedom of positioning is proposed in this paper.
By independently adjusting the phase and the amplitude of the input signals, the blind spots …

Various examples are provided for wireless power charging for versatile receiver positions.
In one example, a three dimensional array of transmitter coils is positioned around a …

Various examples are provided for power amplifiers for coil array systems, which include
load-independent Class E power amplifiers. In one example, a wireless charging system …