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A new low-profile planar Eleven antenna is designed for optimal MIMOperformance as a wideband MIMO antenna for micro base-stations in futurewireless communication systems. The design objective has been to optimize boththe reflection coefficient at the input port of the antenna and the 1-bitstreamand 2-bitstream MIMO efficiency of the antenna at the same time, in both theRich Isotropic MultiPath (RIMP) and Random Line-of-Sight (Random-LOS)environments. The planar Eleven antenna can be operated in 2-, 4-, and 8-portmodes with slight modifications. The optimization is performed using geneticalgorithms. The effects of polarization deficiencies and antenna total embeddedefficiency on the MIMO performance of the antenna are further studied. Aprototype of the antenna has been fabricated and the design has been verifiedby measurements against the simulations.

Design of a Planar Eleven Antenna for Optimal MIMO Performance as a Wideband Micro Base-station Antenna