Surface-wave resonance phenomena on dielectric tubes

It has been shown theoretically that resonant azimuthal surface waves can be set up on a cylindrical-surface reactance sheet, and the special case of a line-source excitation has been studied by Cullen and by Wait and Conda. In the present paper the use of a dielectric tube to provide the necessary surface reactance is studied theoretically and experimentally. The main features of the theory are confirmed, but there are some discrepancies in detail which require further study. Possible applications are discussed, particularly in relation to the supergain-aerial problem.