Efficiencies of superconducting small antennas connected to lossless disks over lossy groundplanes

Superconducting electrically small monopoles and half loops over lossy groundplanes with perfectly conducting disks attached to their bases are modeled using a moment method incorporating Sommerfeld-type integrals. It is shown that improved efficiency is obtainable by incorporating these disks, compared with cases where the antennas are connected directly to the groundplanes.<
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