Amplifier-loaded metasurface has been an efficient way for breaking reciprocity and realizing power amplification. Here, we proposed a dual-band nonreciprocal transmissive metasurface realizing tunable continuous amplitude control from −35 dB to 27 dB and nonreciprocal transmission of 75 dB. The meta-atom is composed of two arc-shaped slots embedded circular patches and two amplifying circuits. The transmission amplitude can be dynamically manipulated by different bias-voltage loaded onto the circuits. The proposed metasurface shows potentials in applications of nonreciprocal systems and signal enhancement.
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Tong et al. (2024) studied this question.
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