Short Circuit Admittance Parameters (Y- Parameters):
The admittance parameters represent the relation between the currents and the voltages in the two- port network.
The admittance parameters matrix may be written as
Y11 and Y21 can be calculated by short circuit Port-2
Y12 and Y22 can be calculated by short circuit Port-1
In this matrix equation, it is easily seen without even expanding the individual equations, that
It can be seen that the Y-parameters correspond to the driving point and transfer admittances at each port with the other port having zero voltage (i.e., short circuit). Thus, these parameters are also referred to as the short circuit parameters.
