On the Question of Computation of the Dyadic Green´s Function at the Source Region in Waveguides and Cavities (Short Papers)

The derivation of the dyadic Green´s function for rectangular waveguides and cavities is approached systematically by using the theory of distributions. It is shown that, in order to obtain a complete solution for the field distribution in the entire structure, one must add an additional term to the classical expansion which is valid only outside the source region.