Abstract
Electrically small loop antennas become efficient radiators when constructed of high-temperature superconducting (HTS) materials since the surface resistance losses can be significantly reduced below the small radiation resistance of the loop. Recently, a significant improvement in radiation efficiency (30 vs 3%) was demonstrated for a small (0.04/spl lambda/ at 500 MHz) HTS half loop compared to a grid antenna. HTS materials can also improve the radiation efficiency of closely packed (i.e., >
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