Open Circuit Impedance Parameters (Z-Parameters):

The impedance parameters represent the relation between the voltages and the currents in the two- port network.

The impedance parameter matrix may be written as

Z11 and Z12 can be calculated by Open circuit at Port-2 side then I2 becomes zero

Z21 and Z22 can be calculated by Open circuit at Port-1 side then I1 becomes zero

In this matrix equation, it is easily seen without even expanding the individual equations, that

It can be seen that Z-parameters correspond to the driving point and transfer impedances at each port with the other port having zero current (i.e., open circuit). Thus, parameters are referred to as the open-circuit parameters.


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