Broadband Determination of Two-Port Transmission (S21, S12) Parameters of PHEMT's Embedded in Transmission Lines

A broadband de-embedding method for two-port transmission parameters is presented. This method is based on the computation versus frequency of the monotonous phase variations of the positive travelling wave λ. The main advantage over already published methods is that the physical length of lines involved in de-embedding of the two port transmission (S
₂₁
and S
₁₂
) parameters is not needed.