The power radiated by a surface wave circulating around a cylindrical surface

Recognizing the evanescent character of the surface-wave field distribution over the equi-phase planes and the important part played by the inclination of these planes with the normal to the interface when power is transferred across it, calculations are made for radiation arising when a wave of this kind circulates around a highly reactive supporting surface of cylindrical form. It is concluded that, when the surface has a finite loss, there will be a particular radius of curvature for which the surface wave progresses for a limited distance without attenuation.