APPLICATION OF THE GSD TECHNIQUE TO THE ANALYSIS OF SLOT-COUPLED WAVE-GUIDES

The generalized spectral domain (GSD) technique is applied to the anal ysis of waveguide coupling by axially uniform slots. For a slotted-cir cular waveguide, cut off wavenumbers of TE and TM modes as well as the corresponding field distributions. in the composite waveguide are det ermined and compared to that obtained by other methods. Plots of the f ield lines corresponding to the dominant as well as a number of higher order modes are presented. It is shown that considering the H-oo mode s in the comprising waveguides is necessary. Furthermore it is demonst rated hew the efficiency of the method regarding accuracy and CPU time requirements can considerably be enhanced if infinite Sums over eigen modes which have to be evaluated are replaced by closed-form expressio ns.