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Applications of metamaterials have been limited by parasitic resistive losses. We present the design and measurement of split ring resonators with embedded active field effect transistor circuits comprising a magnetic metamaterial. We show that the imaginary part of the effective permeability changes sign within the bandwidth of the negative differential resistance region, creating a stable gain medium...
We present the design and experimental validation of a self-tuning metamaterial. We begin with an active two-state split ring resonator and build up to a self-contained system that includes feedback. We show the ability of the active split ring resonator to track and lock to an incident RF signal around 1 GHz. The SRR has a tuning capability of 4% bandwidth and takes a maximum of 3 seconds to track...
We present several results that use transistors within the context of metamaterials. Transistors are a fundamental device in the construction of several RF systems and applications. The basic device physics of the transistor allow for the convenient construction of variable resistors, oscillators, switches, and amplifiers. Embedding transistors within the confines of a split ring resonator (SRR),...
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