Abstract
Magneto-dielectric substrates with thin magnetic fllms show great potential in realizing electrically small tunable antennas with improved directivity and higher bandwidth than those realized on dielectric substrates. This paper introduces self-biased magnetic fllms as a practical means to tune a patch antenna by loading a commercially available dielectric substrate. Novel antenna designs with self-biased metallic magnetic fllms and ferrite fllms were investigated. These magnetic patch antennas have improved the axial ratio from 1.57dB to 0.97dB with respect to the central frequency ranging from 1.575GHz to 1.562GHz, a large radiation frequency tunability of about 40% to 80% of the i10dB bandwidth, and a signiflcantly enhanced directivity.
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