- Series connection of two 2-port networks:
*Z*=*Z*1 +*Z*2 - Parallel connection of two 2-port networks:
*Y*=*Y*1 +*Y*2 - Cascade connection of two 2-port networks:
*A*=*A*1 .*A*2

**Reciprocal and Non reciprocal Networks :**A two port network is called reciprocal if the open circuit transfer impedances are equal Z12 =Z21 . Consequently, in a reciprocal two port network with current I feeding oe port , the open circuit voltage measured at other port is the same, irrespective of the ports. The voltage is equal to V = Z12*I = Z21*I. Networks containing resistors,inductors and capacitors are generally reciprocal. Networks that additionally have dependent sources are generally nonreciprocal

*.*

*Z*parameters in terms of remaining parameters given by :

where D is the determinant of the corresponding matrix.

For examples and more details visit the site given below :

http://fourier.eng.hmc.edu/e84/lectures/ch3/node11.html

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