Serrated waveguide--Part I: Theory

A corrugated waveguide in which the corrugations pierce the broad wall, permitting leakage, is called a serrated waveguide. Controlling the size and spacing of the serrations will permit the design of a practical traveling-wave antenna. In this paper, an analysis is presented for the case of serrations which have a transverse dimension equal to the width of the broad wall, and longitudinal dimension and spacing that are small compared to a wavelength. The analysis yields an expression for the complex propagation constant of the leaky hybrid mode in the serrated guide, and computations reveal an adequate range of leakage.