Abstract
This paper presents the design and evaluation of a multiple-input multiple-output (MIMO) antenna system consisting of pattern reconfigurable antennas. The reconfigurable antennas used are based on radiating elements that are fed in parallel and two possible phase differences between them can be switched with p-i-n diodes. Two parasitic elements in vicinity of one of the antennas enable the generation of further two directive patterns. The radiation patterns realized by this MIMO system are optimized for automotive urban scenarios based on the results of previous research. As a proof of concept the patterns realized by these antennas are evaluated in a channel simulation and different arrangements on a car's roof are investigated. The simulation results considering various scenarios show the improvement in channel capacity by as much as 4 bit/s/Hz and 3 bit/s/Hz compared to system using monopoles for rural and urban cases respectively.
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