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Metasurfaces composed of subwavelength unit cells usually require a largenumber of unit cells which leads to complicated design and optimization.Aggressive discretization in a metasurface can significantly reduce the numberof unit cells within a period, resulting in lower requirement for phase and/orsurface impedance coverage. Additionally, the enlarged unit cells willencounter negligible mutual couplings when combined together, hence makingstraightforward the process of metasurface design. These advantages combine toallow the design of a novel class of metasurfaces which support the highefficiency redirection of electromagnetic (EM) waves over a wide bandwidth andoperation angle. Moreover, an aggressively discretized metasurface may realizefunctionalities such as diffraction mode circulation, which are unsupported inits continuous counterparts. In this paper we propose a simple transmissivemetasurface which can realize diffraction mode circulation by refracting planewaves with incident angles of -45, 0, 45 degrees to plane waves with refractionangles of 0, 45, -45 degrees respectively. The power efficiency of eachanomalous refraction is more than 80% at the design frequency of 28 GHz, andthe 3-dB power efficiency bandwidth is 11%. We fabricated and measured themetasurface, the experiment results agree well with simulation results.

Discrete Huygens' Metasurface: Realizing Anomalous Reflection and Diffraction Mode Circulation with a Robust, Broadband and Simple Design