Deficiencies in the way scattering parameters are taught

The scattering parameters are fundamental in the characterization of electrical devices at high frequencies. They are particularly useful for analyzing multiport high-frequency and microwave networks. However, they are not adequately presented in most, if not all, microwave engineering books. This paper identifies two common deficiencies in the way scattering parameters are being presented in these books. It provides additional information that should supplement those books or book chapters on scattering parameters.