Miniaturized Resonant Antenna Using Ferrites

Abstract

The radiation resistance and reactance of point source dipoles are profoundly affected by the surrounding medium. A radiator of length l in an infinite ferrite medium is electrically μl meters long if μ=ϵ (relative permeability and permittivity).For very small ferrite spheres, the radiation resistance is determined by the relative permittivity, the effective reactance length by both the permittivity and the permeability. Thus it is possible to exchange length for resistance. Further work on linear radiators surrounded by ferrite in the form of a prolate figure of revolution is indicated.Peer Reviewedhttp://deepblue.lib.umich.edu/bitstream/2027.42/70573/2/JAPIAU-29-3-401-1.pd