Abstract
A new sub-6 GHz antenna array that supports slant ±45° dual-polarization multiple-input multiple-output (MIMO) communications with high interport isolation and stable radiation performance over wide scan angles and bandwidths is designed. An architecturally inexpensive solution, which combines a standard truncated waveguide array and a single-layer patterned metasurface superstrate with wave manipulation capabilities, is proposed. A task-oriented formulation is adopted to mathematically formulate the <italic xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">EM</i> associated multiscale design problem, then solved with an innovative instance of the system-by-design (SbD) paradigm where the fast and reliable modeling of the device is yielded by an <italic xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">ad hoc</i> artificial intelligence-based surrogate. The final layout of the antenna array is validated with industry-standard full-wave numerical simulators.
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