Comments on "Experimental Measurement of Microstrip Transistor Package Parasitic Reactance" [Letters]

In the above paper, Akello et al. describe a method for experimental determination of the parasitic of microstrip-transistor packages, based on a resonance principle. A different method of measuring small reactances and susceptances, also permitting the determination of transistor-package elements based on time-dornain techniques, is given by Piller in [1]. This method avoids the difficulties resulting from critical coaxial to microstrip transitions.