Transmission Parameters (ABCD – Parameters):

The ABCD parameters represent the relation between the input quantities and the output quantities in the two-port network. They are thus voltage-current pairs.

However, as the quantities are defined as an input- output relation. The transmission parameter matrix may be written as

A and C can be calculated by Open circuit Port-2

B and D can be calculated by short circuit port-1

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

These parameters are known as transmission parameters as in a transmission line, the currents enter at one end and leave at the other end, and we need to know a relation between the sending- end quantities and the receiving-end quantities.

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