The launching of surface waves on an axial-cylindrical reactive surface

The excitation of the dominant TM surface wave on an axial-cylindrical reactive surface is discussed. The surface wave launcher consists of a perfectly conducting, infinitely thin cylindrical surface of radiusbcoxial with a cylindrical reactive surface of a radiusawhereb > a. The reactive surface extends from-infty , and the perfectly conducting surface extends from-infty. The incident field is the dominant TM mode in the coaxial portion of the structure propagating in the positivez-direction. Numerical results are obtained for the reflected field, the surface wave field, and the radiation field. These results are then compared with the results that use two approximate aperture distributions. This method of excitation was very efficient over a large range of frequencies and over wide variations in the surface reactance.