MM/MoM CAD of broadband taper/branching OMTs utilizing stepped T-junctions

A hybrid mode-matching (MM) / method-ofmoment (MOM) technique is applied for the accurate CAD and optimization of low-cost taperbranching ortho-mode transducers (OMTs) of improved performance. New aspects include the consideration of more general structures of the taper incorporating the branching section and the fact that the hybrid MMMoM technique achieves the fast direct optimization of such components within short time frames. The effcieucy and accuracy of the method is verified by comparison with available reference values. Its versatility is demonstrated at a WR-112 OMT example with stepped taper functions that also vary within the branching region achieving about 20% bandwidth.