engleski

Investigation of Bandwidth of Band-pass Non-Foster Negative Capacitor for use in Active Metasurfaces

So-called non-Foster elements (negative capacitors and negative inductors) are gaining popularity in metamaterials and metasurfaces. However, there is a well-known `bottleneck' of non-Foster technology: inherent proneness to instability. Recently, there have been several theoretical and experimental studies reporting novel `band-pass' non-Foster elements with improved stability properties. Here, a connection between maximal achievable operation bandwidth and stability is investigated for the case of a band-pass non-Foster capacitor. To this end, a closed-form stability-bandwidth criterium was derived. Numerical and experimental verification of derived criterium proved its correctness and confirmed that maximal achievable bandwidth is inversely proportional to the overall system negative capacitance.

Capacitors, Capacitance, Bandwidth, Stability analysis, Circuit stability, Numerical stability, Band-pass filters

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