Compact multisector antenna system using folded Vivaldi radiators

This paper deals with a 3D low-profile 6-sector antenna system designed for home networking MIMO applications in the 5 GHz band. The designed system utilizes the proposed new concept of folded end-fire Vivaldi antenna. It is made up of several low-cost FR4-based substrates, six of which are placed vertically around a common central axis and inserted between two horizontal circular substrates, all featuring a reel in shape. The folded Vivaldi antennas are arranged in such a way that two contiguous antennas are almost orthogonally polarized leading to improve the isolation between contiguous sectors.