Computation of the radiation Q of dielectric-loaded electrically small antennas in integral equation formulations

A new technique for estimating the impedance frequency bandwidth of electrically small antennas loaded with magneto-dielectric material from a single-frequency simulation in a surface integral equation solver is presented. The estimate is based on the inverse of the radiation Q computed using newly derived expressions for the stored energy and the radiated power of arbitrary coupled electric and magnetic currents in free space.