Single-Prism Risley Scanner at Ka-Band
Résumé
This contribution presents a new Risley scanner architecture for beam-steering antennas. Classical Risley scanners are based on a feed (source) illuminating a system of two prisms. The source usually radiates a directive beam aligned with the central axis of the scanner. The azimuthal positions of the two prisms around their axis controls the pointing direction of the whole system, both in azimuth and elevation. Here, we propose first to reduce the complexity and profile of the system by substituting the source and the first prism of the scanner with a leaky-wave feed. The leaky-wave feed radiates its main beam at about 30 degrees relatively to its normal, and is based on a sinusoidally modulated metasurface fed by a pillbox beamformer. Second, we propose to manufacture the second prism using dielectric loaded metallic waveguides, realized through the combination of two additively manufactured parts. The proposed structure is validated by full-wave simulations and the fabrication and testing of a prototype. The antenna operates in the 19.2-21.2 GHz band for a field of view of 360 degrees in azimuth and 60 degrees in elevation.
Domaines
Sciences de l'ingénieur [physics]
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