Parametric Amplification of Magneto-Inductive Waves

Abstract

AbstractParametric amplification is a method of low-noise signal amplification of that operates by mixing the signal with a high-frequency, high power pump in a single non-linear reactive component, a varactor diode. Here its application to the amplification of magneto-inductive (MI) waves is demonstrated. MI waves are slow waves that propagate in linear chains of magnetically coupled L-C resonators known as MI waveguides. Such waveguides can be formed into ring resonant structures, and used for signal detection in magnetic resonance imaging (MRI). MI waves and waveguides are first reviewed. The theory of parametric amplification in single resonant elements is then described, and extended to travelling wave structures and ring resonators. Experimental verification is presented for systems designed to operate at 63.85 MHz, the frequency for \(^1\)H MRI in a 1.5 T magnetic field.KeywordsResonant FrequencyPrimary ResonanceRing ResonatorMagnetic CouplingMagnetic Resonance Imaging SignalThese keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.