  As wireless power transfer (WPT) repeaters, metasurfaces can enhance field
coupling, improving the WPT operation. In this paper, we show that metasurfaces
can also be used as transmitters of capacitive WPT systems. Such a
metasurface-based WPT system can feed multiple receivers and provide robust
operation against load or position variations. We formulate an analytical model
of such WPT systems. We also discuss the exact solution of a particular example
with $N$ identical receivers.
