Abstract— The conditions for maximum power transfer from a
source antenna to a receiving antenna are examined when the
two antennas are in close proximity. As an example, computed
and measured results are described for the power transfer
efficiency for two-element Yagi antennas. These results can be
used to design matching networks between the antenna and a
load such as a voltage multiplier for power transfer in a wireless
sensor network. It is concluded that maximum PTE could be
obtained by continuously tuning the antenna and matching
network as the antenna separation and load conditions change.