ABCD parameters

Updated January 20, 2009

New for January 2009! ABCD parameters can be used to describe the behavior of a linear network, just as S-parameters can. Most microwave engineers are very familiar with S-parameters, we use them every day in taking data, writing reports and presentations. So why would you consider using ABCD parameters?

The answer is simple; ABCD matrices can be cascaded to provide the performance of two cascaded networks, S-parameters don't have a neat solution for cascades. So behind the scenes, anyone that is doing math with vector S-parameters is probably converting to ABCD before and after the operations!

ABCD to S-parameters

Generalized tee and equations