Suitable multiantenna placement in mobile handsets based on electromagnetic isolation

This paper introduces an S-parameter-based method for characterizing and improving the electromagnetic (EM) isolation between antennas in handsets. Eight different antenna placements are investigated across a frequency range of 400– 6000MHz covering all possible LTE-A bands. Simulations of realistic antenna elements validate the theoretical results. The results show that at least three antennas are needed in order to find a well-isolated pair at a given frequency.