# Two Port Network, Driving Point And Transfer Functions

Transfer impedance, Z(

*s*) =

Transfer admittance

Voltage transform function,

Current transform function,

Z-parameters (or impedance parameters):

...(*ii*)

V_{1} = Z_{11}I_{1} + Z_{12}I_{2} ...(*iii*)

Condition of reciprocity of Z-parameters :

Z_{12} = Z_{21}

Condition of symmetry of Z-parameters :

Z_{11} = Z_{22}

Y-parameters (or short circuit Admittance parameters) :

I_{1} = Y_{11}V_{1} + Y_{12}V_{2}

I_{2} = Y_{21}V_{1} + Y_{22}V_{2}

Condition of reciprocity : Y_{12} = Y_{21}

Condition of symmetry : Y_{11} = Y_{22}

h-parameters (or hybrid parameters)

V_{1} = *h*_{11}I_{1} + *h*_{12}V_{2} ...(*i*)

I_{2} = *h*_{21}I_{1} + *h*_{22}V_{2} ...(*ii*)

Condition of reciprocity of *h*-parameters : *h*_{12} = â€“ *h*_{21}

Condition of symmetry of *h*-parameters : *h*_{11}*h*_{22} â€“ *h*_{12}*h*_{21} = 1

ABCD parameters (or transmission parameters)

V_{1} = AV_{2} + B(â€“ I_{2})

I_{1} = CV_{2} + D(â€“ I_{2})

*Condition of reciprocity *:AD â€“ BC = 1

*Condition symmetry *: A = D