Ferromagnetic Resonance-Enhanced Electrically Small Antennas

It is proposed that ferromagnetic resonance (FMR) of thin-film ferrites can be utilized to simultaneously improve the radiation efficiency and input impedance matching electrically small antennas (ESAs). To validate concept, role FMR in first derived analytically with an ideal ferrite radiator. was concluded Gilbert damping ferrite, determining quality factor FMR, directly impacts on antenna. A practical example form single-loop antenna loaded a yttrium-iron-garnet (YIG) core. The prototype has been designed, fabricated, evaluated through both full-wave simulations experiments. simulation results match well experimental results, demonstrating efficacy significance idea. In addition, broadband equivalent circuit models are model loops without enhancement provide additional insights into design. prove effective predicting FMR-enhanced ESAs at precision comparable simulations.