A Variational Expression For The Scattering Matrix Of A Double-Step Discontinuity In A Coaxial Line And Its Application To A Tem Cell

A variational expression for the scattering matrix of a double-step discontinuity in a two-mode coaxial transmission line is obtained and generalized to the case of a multimode coaxial transmission fine. The result is used to analyze the transmission characteristics of a two-mode coaxial TEM cell.