Dylan F. Williams, Roger Marks, Dave K. Walker, Fred R. Clague
Experimental evidence is presented that shows the conventional expression relating the transducer efficiency of a two-port to measured scattering parameters is incorrect when the characteristic impedance at one of the ports is complex. This evidence is based on the measurement of the power from a microwave source transferred through a probe to a lossy coplanar waveguide. The conventional expression differs from the measurement by up to 20%. An alternative expression, accounting for the complex characteristic impedance, gives accurate results.
, Marks, R.
, Walker, D.
and Clague, F.
Wafer Probe Transducer Efficiency, IEEE Microwave and Guided Wave Letters, [online], https://doi.org/10.1109/75.160116
(Accessed June 8, 2023)