THE CONTINUOUS-SPECTRUM OF THE INSET DIELECTRIC GUIDE AND ITS APPLICATION TO WAVE-GUIDE TRANSITIONS

The analysis of discontinuities in open waveguides, particularly stron gly radiating discontinuities, requires a knowledge of the complete mo dal spectrum of the guide. The continuous spectrum of nonseparable ope n waveguides, a category which includes many useful high frequency str uctures, may be developed from a characteristic Green's function appro ach. This paper shall present as an example the continuous hybrid spec trum of the Inset Dielectric Guide (I.D.G.), a structure that shows pr omise for both propagation and antenna applications. As a verification , this spectrum has further been used to analyze strongly radiating re ctangular waveguide to I.D.G. transitions, achieving a good correlatio n with experimental data.