1 Answer
The **Zāā** parameter in a **Z-parameter (impedance parameter) matrix** is called the **reverse transfer impedance**.
In a **two-port network**, the Z-parameters are defined as:
\[
\begin{bmatrix} V_1 \\ V_2 \end{bmatrix} =
\begin{bmatrix} Z_{11} & Z_{12} \\ Z_{21} & Z_{22} \end{bmatrix}
\begin{bmatrix} I_1 \\ I_2 \end{bmatrix}
\]
Where:
- \( V_1 \) and \( V_2 \) are the port voltages.
- \( I_1 \) and \( I_2 \) are the port currents.
- \( Z_{21} \) is defined as **\( Z_{21} = \frac{V_2}{I_1} \) when \( I_2 = 0 \) (i.e., output port is open-circuited).**
### Meaning of \( Z_{21} \):
- It represents the **voltage at port 2** due to a **current applied at port 1** while keeping port 2 open.
- It indicates how impedance transfers from **input to output in the reverse direction**.
- It helps in understanding the coupling effect between ports in terms of impedance.
Would you like an example or a practical application of \( Z_{21} \)?
In a **two-port network**, the Z-parameters are defined as:
\[
\begin{bmatrix} V_1 \\ V_2 \end{bmatrix} =
\begin{bmatrix} Z_{11} & Z_{12} \\ Z_{21} & Z_{22} \end{bmatrix}
\begin{bmatrix} I_1 \\ I_2 \end{bmatrix}
\]
Where:
- \( V_1 \) and \( V_2 \) are the port voltages.
- \( I_1 \) and \( I_2 \) are the port currents.
- \( Z_{21} \) is defined as **\( Z_{21} = \frac{V_2}{I_1} \) when \( I_2 = 0 \) (i.e., output port is open-circuited).**
### Meaning of \( Z_{21} \):
- It represents the **voltage at port 2** due to a **current applied at port 1** while keeping port 2 open.
- It indicates how impedance transfers from **input to output in the reverse direction**.
- It helps in understanding the coupling effect between ports in terms of impedance.
Would you like an example or a practical application of \( Z_{21} \)?