A space-time-modulated Josephson junction array is claimed to split an incoming microwave beam into frequency-shifted beams at different angles, but the analytic support is invalidated by a Fourier-coefficient error.
One-way absorption and isolation in space-time-periodic super- conducting metasurfaces,
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Light Interaction With a Space-Time-Modulated Josephson Junction Array and Application to Angular-Frequency Beam Multiplexing
A space-time-modulated Josephson junction array is claimed to split an incoming microwave beam into frequency-shifted beams at different angles, but the analytic support is invalidated by a Fourier-coefficient error.