Abstract
MIMO techniques using multiple antennas for improving communication capacity per unit frequency have been introduced. However, when multiple antennas are arranged in close proximity, the throughput is reduced because of the strong coupling between antennas, which causes low antenna efficiency. In this paper, to solve this problem, we propose a new decoupling method that uses a branch shape element instead of a susceptance circuit between antennas. A two-element MIMO antenna array in close proximity that uses this proposed method is presented. The coupling value S12 and matching value S11 of the S-parameters can be obtained at less than −10 dB in this MIMO antenna array.
