What makes you think an untuned COIL
will make a better isolater than a
PARALLEL RESONANT COIL and CAPACITOR?
X(L) = 2 pi F L
Z(res) = Q X = Q x 2 x pi x F x L
SO, for a loaded Q of 100, the resonant impedance
will be 100 times the tuned coil inductance.
You would need a coil with 100 times the resonant coil's
inductance to have the same impedance magnitude,
ASSUMING the self resonant (due to stray capacitance)
frequency is above the operating frequency.
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