Measurements of Dispersion Relation of Waveguide with Periodic Boundaries

Abstract

Dispersion relation of a sinusoidally corrugated wall waveguide employed in backward wave oscillators or traveling wave tubes has been analyzed and easured. The waveguide is designed and fabricated by casted aluminum. It is concluded that microwaves have different characteristics of body-wave and surface-wave in fast and slow wave regions, respectively, with respect to the velocity of light in vacuum.