Low frequency measurements and microwave measurements :

Sl.No	Low frequency measurements	Microwave measurements
1.	At low frequency it is convenient to measure voltage and current and use them to calculate power.	At microwave frequencies the amplitudes of the voltages and current on a transmission line are the functions of a distance and are not easily measurable.
2.	At low frequency, circuits use lumped elements.	At microwave frequencies, the circuit elements are distributed.