Radiation of a Circular Loop Antenna Enclosed by a Magnetodielectric Sphere

摘要

The input impedance, radiation power in the far zone, and radiation resistance of a circular loop antenna enclosed by a magnetodielectric sphere are analyzed. It is shown that, for electrically short antennas and certain negative values of the real part of the permeability (or permittivity), the radiation resistance and radiation power in the far zone can be substantially increased. It is proposed to use this effect for developing antennas enclosed by solid-state shells, which offer advantages over similar antennas enclosed by plasma shells.