Adaptive impedance control of MIMO antennas for compact mobile device in environment of usage

This paper proposes an adaptive impedance control for MIMO (Multiple Input Multiple Output) antennas and evaluates its basic performance in a realistic environment of usage of the compact mobile device through a computer simulation modeled with a 3D antenna radiation pattern including the human body effect and MIMO propagation channel. The control method searches for a combination of variable capacitors connected to each antenna that maximizes the channel capacity from the selectable combinations with a candidate reduction algorithm. The simulation results show the effectiveness of the adaptive impedance control for MIMO transmission itself and the candidate reduction algorithm.