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This paper gives a description of the radiation quality factor and resonances of spherical antennas with material cores. Conditions for cavity and radiating resonances are given, and a theoretical description of the radiation quality factor, as well as simple expressions describing the relative increase in quality factor due to the effect of the internally stored energy are given in special cases...
We analytically solve the radiation problem for a spherical magnetic dipole antenna with a material-coated perfectly electrically conducting core. Using the closed-form expressions derived for the internal and external stored energies as well as for the radiation quality factor , we determine the optimal geometrical and material parameters of the antenna. We show that the optimal permeability of...
We report a study on the relaxation behavior of the real part of the permittivity. We also discuss the loss tangent of a class of materials in the microwave to millimeter band of frequencies. For relaxation response we show that the permittivity is a monotonic decreasing function of frequency. Also, for many low-loss ceramics, glasses, crystals, and solid polymers we found that the loss tangent increases...
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