Nonreciprocal Nongyrotropic Magnetless Metasurface

By S. Taravati, B. Khan, Shulabh Gupta, K. Achouri, Christophe Caloz. IEEE Transactions on Antennas and Propagation, 2016

135 citations recorded by the source corpus.

We introduce a nonreciprocal nongyrotropic magnetless metasurface. In contrast to previous nonreciprocal structures, this metasurface does not require a biasing magnet, and is therefore lightweight and amenable to integrated circuit fabrication. Moreover, it does not induce Faraday rotation, and hence does not alter the polarization of waves, which is a desirable feature in many nonreciprocal devices. The metasurface is designed according to a Surface-Circuit-Surface architecture and leverages the inherent unidirectionality of transistors for breaking time reversal symmetry. Interesting features include transmission gain as well as broad operating bandwidth and angular sector operation. It is finally shown that the metasurface is bianisotropic in nature, with nonreciprocity due to the electric-magnetic coupling parameters, and structurally equivalent to a moving uniaxial metasurface.

Subfields: Aerospace Engineering, Electronic, Optical and Magnetic Materials

View Paper: https://www.semanticscholar.org/paper/ca6ff9fbfbe5fad7c8f5175704e6d7f8b43c5782

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Citations in the corpus

Susceptibility Derivation and Experimental Demonstration of Refracting Metasurfaces Without Spurious Diffraction (2018, background): “Among these properties, the practically most convenient is certainly the third one, since it allows to achieve diffractionfree generalized refraction with a metasurface that is purely lossless and passive, avoiding complex amplification, and at the same time is reciprocal, avoiding nonintegrable mag”
Mixer-Duplexer-Antenna Leaky-Wave System Based on Periodic Space-Time Modulation (2016, background): “ems [10]–[15]. Several applications of space-time modulated nonreciprocal structures have been subsequently reported, including isolators [10], circulators [16], [17], nonreciprocal metasurfaces [18]–[21] and nonreciprocal antennas [22]–[ 26]. This paper presents a two-port nonreciprocal space-time ”
Roadmap on metasurfaces (2019, unknown): “need for unaltered polarization state), then a simple nongyrotropic metasurface isolator can be realized using the array-circuit-array philosophy in [113], as reported in [115]; such a metasurface may find applications in instrumentation, sensing and communications.”
Phase-Induced Frequency Conversion and Doppler Effect With Time-Modulated Metasurfaces (2020, background): “On the contrary, only few realistic metasurfaces with time-varying surface impedance have been proposed [23], [26], [30], [48], [49], even though several theoretical works on the topic have envisioned interesting applications (Ref.”