A hybrid evaluation method for the full-wave analysis of microstrip structures

A hybrid evaluation method using both the spectral- and the spatial-domain techniques is proposed for the evaluation of the Sommerfeld-type integrals resulting from the full-wave analysis of microstrip structures. This method combines the advantages of the spectral-domain for the evaluation of near fields and the spatial-domain method for the evaluation of far-fields. This method is simple and needs no additional formulations. It also provides an easy alternative method to handle the inefficiency of calculation with the singularity of the Green's function. Numerical results are used to demonstrate the simplicity and the accuracy of this method.