Dyadic Green's functions for curved waveguides and cavities and their reformulation

The dyadic Green's functions (DGFs) for curved waveguides and cavities are derived through a simple procedure, and reformulated into a new form convenient for numerical computation when both the source and field points are located at the same waveguide wall. A general procedure for reformulation of DGFs is proposed for general waveguides. The DGFs derived can be used for solving the problems with curved waveguide coupling and radiating slots, as well as waveguide junction problems.