CAD of magic tee with interior stepped post for high performance designs

A CAD - based on the Finite Element/Mode Matching (FE/MM) method - is introduced for high performance Magic Tee designs that make use of an interior stepped post discontinuity in the branching region. The theoretical considerations of the approach are outlined. For validation a Magic Tee is designed and realized at 12 GHz exhibiting high performance properties over a 14 % bandwidth. Accurate coincidence of computed and measured responses verifies the CAD method.