Inverse design of sub-wavelength metadeflectors for an ultra-flat antenna system in Ka-Band
Résumé
inverse design methodology is developed to optimize a sub-wavelength metadeflector structure used on an ultra-flat antenna system in Ka-band. The strategy adopted combines two ingredients : a high order HDGFD (Hybrid Discontinuous Galerkin Frequency-Domain) solver of the frequency-domain Maxwell equations coupled to a Floquet modes decomposition for the numerical characterization of the infinite periodic Macro-cell design of the deflector and the EGO algorithm for the optimization of the geometrical characteristics of constituting dielectric pillars. The deflector was specifically designed for Ka-band operation, achieving a 30°deflection at 29GHz, which enables a maximum scan angle of 66°by employing two deflectors using the Risley scanning concept.
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