Question

Why we have to consider distributed parameters im high frequency em circuit?

Answer 1

Answer:

Explanation:

Because of the high frequency (and short wavelengths), standard circuit theory generally cannot be used directly to solve microwave network problems. ... This is due to the fact that, in general, the lumped circuit element approximations of circuit theory are not valid at microwave frequencies.Oct

Answer 2

Because in high frequency the position of prob measure it's very important and any shift of position you can measure any think (variation of RF signal) . for this reason you can measure Scarting parameter (S) this is sqrt of puissance. Voltage and current in higher frequencies of the total capacitance and inductance is dependent on that frequency, even the tools you use to measure with have inductance and capacitance.