Nonreciprocal Components With Distributedly Modulated Capacitors

By Shihan Qin, Qiang Xu, Y. Wang. IEEE transactions on microwave theory and techniques, 2014

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Phase-Induced Frequency Conversion and Doppler Effect With Time-Modulated Metasurfaces (2020, unknown): “allowing breaking reciprocity [21], [22], [33], [36], [37].”
Broadband passive isolators based on coupled nonlinear resonances (2018, background): “If the system is excited with harmonic signals with frequency ω, equation (9) can be written as = + H s s a k k (12) 1 1 inc 2 2 inc”
Magnetless Microwave Circulators Based on Spatiotemporally Modulated Rings of Coupled Resonators (2016, methodology): “Following an approach similar to distributed parametric amplification and frequency conversion [21]–[24], it was recently shown that linear low-noise strong nonreciprocity can be achieved by spatiotemporal modulation of waveguides via appropriate electrical or acoustical signals [25]–[34].”
Mixer-Duplexer-Antenna Leaky-Wave System Based on Periodic Space-Time Modulation (2016, background): “has been pointed out that such unidirectionally modulated structures are fundamentally nonreciprocal [10], and this has triggered a regain of interest in space-time modulated systems [10], [11], [11]–[13]. Several applications of space-time modulated nonreciprocal structures have been subsequently r”