Question

How do you find the voltage reflection coefficient from Y-parameters?

Answer 1

To find the voltage reflection coefficient from Y-parameters, you can use the following formula:

Voltage Reflection Coefficient (Γ)
=

21

11
Voltage Reflection Coefficient (Γ)=
Y
11
    ​

Y
21
    ​

    ​


where:


11
Y
11
    ​

 represents the self-admittance of the port corresponding to the incident voltage.

21
Y
21
    ​

 represents the forward transadmittance, which represents the part of the current leaving the first port and entering the second port with respect to the incident voltage at the first port.

The Y-parameters (or Y-matrix) are part of the four-port network theory used to describe linear electrical networks. They relate the current and voltage at the ports of a two-port network. If you have the Y-parameters for a specific two-port network, you can calculate the voltage reflection coefficient using the formula above. This coefficient is important in understanding how the network reflects voltage waves at its ports.

Keep in mind that Y-parameters are generally used for two-port networks, and if you are dealing with a different type of network or have S-parameters (scattering parameters) instead, the approach would be different.