This paper elaborates the structure and theory of wireless
power transfer via coupled magnetic resonance with single or
multiple Txs and Rxs. It also presents first hand detailed
experimental results with different system compositions and
different phone positions. It can be seen that producing a
simple, low-cost and large charging space wireless mobile
phone charger for both, handheld and on-table charging, is
possible. It will significantly improve the user experience
than near-field wireless chargers under Qi standard and other
wireless charger under A4WP standard with shorter charging
distance or space. Fig. 11 basically shows the charging space
of a single Tx system and a two Tx system.