Channel Capacity Improvement in Near-Field MIMO System Using Metal Wires

Dalin ZHANG  Toshikazu HORI  Mitoshi FUJIMOTO  

IEICE TRANSACTIONS on Communications   Vol.E96-B   No.5   pp.1141-1148
Publication Date: 2013/05/01
Online ISSN: 1745-1345
DOI: 10.1587/transcom.E96.B.1141
Print ISSN: 0916-8516
Type of Manuscript: PAPER
Category: Antennas and Propagation
near-field MIMO,  dual-dipole,  HPBW,  channel capacity,  metal wire,  

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This paper clarifies the effects of metal wires placed around a Multiple-Input-Multiple-Output (MIMO) array with the goal of improving the channel capacity in near-field MIMO systems. Tests are performed on dual-dipole arrays with metal wires placed parallel to the dipoles. If the antenna elements have an appropriate half-power beamwidth (HPBW), there is a clear improvement in the channel capacity of the dual-dipole array. The metal wires are used to increase the multipath richness and the locations of the wires significantly impact the channel capacity. A significant increase in the channel capacity is observed even if only one metal wire is placed in the proper location. We verified the generality of applying a metal wire to improve the channel capacity and that the improvement in the channel capacity is approximately proportional to the number of metal wires.