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Over the past decades, many radome designs to extend the angular scan rangeof phased-array antennas have been devised by utilizing dielectric materialsand metamaterials. More recently, metasurface technology such as planar lensesand beam deflectors have been applied to phased arrays, enabling scan-angleenhancers to have a low profile. In this work, a physical Huygens' metasurface(HMS) two-lens system for scanangle doubling of a phased array is presented.For the HMS unit cells, the wire-loop topology is deployed to achieve hightransmission for the required phase-angle shift. The proposed two-lens systemis analyzed by full-wave simulations and experiments. The simulation resultsdemonstrate that the scan angle doubles when the incident angle is below15{\deg} in accordance to the design specification. Furthermore, thedirectivity degradation of the refracted beams by the two-HMS lenses is in goodagreement with theory. Finally, a fabricated two-lens system with two15{\lambda} long by 15{\lambda} wide metasurface lenses and a16{\times}16-element patch antenna array as a source is experimentally verifiedat 10 GHz. The experimental results are in good agreement with the simulatedresults by showing angle-doubling performance with {\pm}2{\deg} scan errors.

Physical Design and Experimental Verification of a Huygens' Metasurface Two-lens System for Phased-array Scan-angle Enhancement