here is the simulation for the tuner box, for which the input is at port 1 and coil to port 2.
the Blue line is zero resistance, and the purple line is non-zero resistance.
the parameters are:
L = 1uH
Cs = 1.44 mF
The Zero point depends on Cs and L. since the only way to make the input voltage be zero is load impedance be infinite. the infinity can be done by
The local peak require large C2, as large as 1.44mF.
the function of Cs an Cp?