Dispersive Analysis of Double-Corrugated Waveguides for Leaky-Wave Applications

This paper presents an investigation of dispersive behavior of glide-symmetric parallel-plate waveguides perturbed with the opening of slots on one plate of the waveguide, allowing for radiation of a leaky-wave mode. The radiation features can be predicted by computing the real part (phase constant) and imaginary part (attenuation constant) of the leaky-wave complex wavenumber. A periodic method-of-moment is employed to perform this calculation. We focus here on a parametric study of the attenuation in the open stopband. We perform a comparison between glide- and non-glide-symmetric waveguides, finding different levels of attenuation and stopband bandwidth. The effect of different geometrical parameter is discussed with the aim of increasing or reducing the attenuation in the stopband. The former case can have application to the design of EBGs while the latter to the design of leaky-wave antennas with continuous scanning from backward to forward or with stable radiation at broadside.