ABSTRACT
Let a device of interest be brought out as a two-port network connected to a general four-port network as shown in Fig. 31.1. For our purposes, assume that this device is characterized by its
y
parameters, and represented by its
y
-parameter equivalent two-port network as indicated in Fig. 31.2, in which the
F x Y x
( ) = ( )( )0
parameter
y
controls signal transmission in the forward direction through the device, whereas
y
gives the reverse transmission, accounting for the internal feedback within the device. Our objective is to measure the return difference with respect to the forward short circuit transfer admittance
y
.
