Actually, transfer impedance DOES remain constant with
frequency WITHIN THE LIMITS OF THE CABLE DESIGN.
In much the same way we simplify the characteristic
impedance of coaxial cable and say that it remains
constant with frequency. We all know that it doesn't
(a) at low frequencies and (b) at a frequency that is
high enough that the spacing between inner and outer
becomes a significant part of a wavelength.
Of course, if the tranfer impedance is measured using
the IEC method, which is flawed, the measurements will
not remain constant with frequency.
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