Abstract—This paper describes a technique for multifrequency
wireless power transfer systems in which the wireless power can be
transmitted through the wireless power transfer channel or channels from the transmitter to the targeted loads with receiver coils
specifically tuned for energy reception. Auxiliary circuits comprising bandpass and/or bandstop circuits are proposed for incorporation into the receiver circuits and optional relay circuits so as
to facilitate the selection and enhancement of the wireless power
transfer to the designated load without causing significant cross
interference due to the use of multifrequency wireless power flow
control. A unique feature of this technique is that the nontargeted
receiver will automatically act as a relay resonator to enhance
1) magnetic coupling, and thus, 2) the power transfer between the
power transmitter and the targeted receiver. A second novel feature is that the chosen operating frequencies for the tuned receivers
need not be widely apart because the auxiliary circuits consist of
bandpass and/or bandstop filters to reduce any cross interference
from the nontargeted frequency. The proposed technique has been
practically verified in experimental prototype.