engleski

Tailoring Stability Properties of One-dimensional Non-Foster Electromagnetic Structures

Networks with non-Foster elements are active systems that may suffer from stability problems. Some studies have shown that dispersion of non-Foster elements can assure a stable operation of practical systems. However, there is an idea to turn the instability of a network that contains non-Foster element into a useful feature. We present analysis of one- dimensional self-oscillating structure that can be modelled as an ordinary impedance and non- Foster impedance, mutually connected via a transmission line. The oscillation process has been analyzed in two different methods: analysis of poles of the network transfer function in Laplace domain, and transient simulation using non-linear SPICE model of active device. The main goal of this study is to find a clear connection of the frequency and amplitude of oscillating signal to the dispersion and non-linear properties of the non-Foster device. It is believed that this investigation can pave a way towards a construction of practical self-oscillating Fabry-Pérot antennas and laser-like metasurface systems.

active metamaterials ; metasurface

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