Dielectric resonant magnetic dipoles: paradoxes, prospects, and first experiments

We review various forms of dielectric ring-shaped oscillating circuits excited by displacement currents due to the grazing incidence of GHz microwaves. Such circuits with azimuth displacement currents form resonant dielectric magnetic dipoles. We calculate and measure resonances in field spectra in the near zone of such dipoles. We demonstrate the inversion of the magnetic inductance flux and the formation of a negative magnetic permeability in the resonant range of dielectric magnetic dipoles. We also investigate, both analytically and experimentally, the resonant interaction spectra of a pair of magnetic dipoles excited by displacement currents. Finally, prospects for using these dipoles to model all-dielectric nanostructures with alternating-sign magnetic permeability are discussed.