Metasurface Magnetless Specular Isolator
Guillaume Lavigne, Toshiro Kodera, Christophe Caloz

TL;DR
This paper introduces a novel metasurface-based magnetless specular isolator that reflects or absorbs waves depending on the incident direction, utilizing nonreciprocal normal susceptibilities and a U-shaped transistor-loaded structure, demonstrated through simulation and experiments.
Contribution
It presents the first metasurface with nonreciprocal normal susceptibilities and a unique nonreciprocity mechanism, realized with a U-shaped transistor-loaded structure.
Findings
Achieved 41 dB isolation in simulations.
Achieved 38 dB isolation in experiments.
Demonstrated nonreciprocal reflection and absorption behavior.
Abstract
We present a (nongyrotropic) metasurface magnetless specular isolator. This device reflects as a mirror a wave incident under a specified angle in one direction and absorbs it in the opposite direction. The metasurface is synthesized in terms of bianisotropic susceptibility tensors, whose nonreciprocity resides in normal components and exhibits a hybrid electric, magneto-electric nature. The metaparticle is implemented in the form of a U-shaped conducting structure loaded by a transistor. The operation principle of the specular isolator is demonstrated by both full-wave simulation and experiment, with isolation levels reaching 41 and 38 dB respectively. This system represents the first realization of a metasurface involving nonreciprocal normal susceptibilities and features a previously unreported type of nonreciprocity.
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Taxonomy
TopicsMetamaterials and Metasurfaces Applications · Advanced Antenna and Metasurface Technologies · Electromagnetic Scattering and Analysis
