A 2-port Network has Z-parametersZ11Z12 If the network is

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A 2-port Network has Z-parameters Z₁₁ Z₁₂ If the network is augmented by adding an impedance R at the input port as shown, the Z-parameters of the augmented network will be—
Z₂₁ Z₂₂

4. None of the above

Correct Option: C

Since V′ ₁ = I₁ R + V₁
V′ ₂ = V₂
So, V′ ₁ = I₁R + Z₁₁ I₁+ Z₁₂ I₂
= (Z₁₁+ R) I₁+ Z₁₂ I₂
V′ ₂ = Z₂₁ I₁ + Z₂₂ I₂ = Z₂₁ I₁ + Z₂₂ I₂
On comparing with the standard equation, we get

Z′ ₁₁ = Z₁₁ + R
Z′ ₁₂ = Z₁₂
Z′ ₂₁ = Z₂₁
Z′₂₂ = I₂₂

A 2-port Network has Z-parameters			Z₁₁	Z₁₂		If the network is augmented by adding an impedance R at the input port as shown, the Z-parameters of the augmented network will be—
			Z₂₁	Z₂₂