A Radial Glide-Symmetric Corrugated Sectorial Leaky-Wave Antenna

A fully-metallic periodic corrugated sectorial leaky-wave antenna is proposed, for application to direction-of-arrival (DoA) estimation. This application requires the scanning of the field-of-view (FoV) with beams having high diversity. For this reason, the presence of mirror symmetries in the antenna should be avoided. The antenna presented here consists of a sectorial waveguide with radial glide-symmetric corrugations in the bottom plate and radiating slots in the top plate. The aim of this paper is to investigate how radial glide-symmetric corrugations in a sectorial waveguide can introduce an asymmetric field distribution across the azimuthal direction. Moreover, in the paper the azimuthal-dependent properties of the leaky-wave antenna are studied, where concentric slots with different radial periods can avoid ambiguities in phi by further breaking the symmetry of the azimuthal-independent pattern. This will be important in the use of such a passive structure with a bidimensional and azimuthal-dependent field-of-view (FoV) in flat technologies.