Non-reciprocal components are useful in microwave engineering and photonics, but they are not without their drawbacks. A compact design now provides non-reciprocity without resorting to magnets or nonlinearity.
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Sihvola, A. Power inequality. Nature Phys 10, 903–904 (2014). https://doi.org/10.1038/nphys3166
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DOI: https://doi.org/10.1038/nphys3166
