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A majority of non-Foster antenna matching circuits and non-Foster metamaterials are based on a simple parallel combination of positive and negative capacitor. It is known that these networks are stable if the overall “mesh” capacitance is positive. Here, we show that this widely accepted criterion fails if a transmission line of any finite length (different from zero) is inserted between an ideal...
An extraordinary transmission through a metamaterial-loaded subwavelength aperture is inherently a narrowband phenomenon. Here, we propose a simple experimental setup for investigation of non-Foster-based tunneling in radiofrequency regime. Combined full-wave and circuit-theory simulations showed that it is possible to achieve stable broadband tunneling within 1:7 bandwidth.
Majority of non-Foster-based metamaterials or antenna matching circuits are based on simple networks that contain parallel or series combination of positive and negative capacitor. It is well-known that these networks are stable, if the overall capacitance is positive. It is shown that this stability criterion becomes fundamentally different if a segment of a transmission line is inserted between...
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