In this paper the interaction of the planar inverted-F antenna array, mounted on a mobile handset, with a human hand-head phantom is investigatedin the 1.9 GHz band. The hybrid approach involving the particle swarm optimization (PSO) and Nelder-Mead (NM) algorithm is considered to optimize the complex excitations of the adaptive array elements in a mutual coupling environment for different beamforming ... إقراء المزيد