A measurement method for scattering parameters (S-parameters) of high power
transistors is presented. The proposed method directly determines the S-pa
rarneters of high power transistors by measuring overall gain, phase and S-
pararneters of input and output matching network when the transistor is ope
rating normally. Using this method the S-parameters I Of a small-signal amp
lifier transistor Motorola MRF581, and a commercial high power transistor,
Motorola MRF6402, are obtained.