Publication: IEICE TRANSACTIONS on Communications Publication Date: 2016/01/01 Vol. E99-BNo. 1pp. 48-57 Type of Manuscript: Special Section PAPER (Special Section on Recent Progress in Antennas, Propagation and Wireless Systems Related to Topics in ISAP2014) Category: Antennas and Propagation Keyword: MIMO, directivity, higher order mode, capacity,