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International Journal of Antennas and Propagation
Volume 2014, Article ID 608345, 9 pages
http://dx.doi.org/10.1155/2014/608345
Research Article

Design of a Practical and Compact mm-Wave MIMO System with Optimized Capacity and Phased Arrays

1NTNU and UniK, 7491 Trondheim, Norway
2ABB and UniK, 1396 Billingstad, Norway
3NTNU, 7491 Trondheim, Norway

Received 21 February 2014; Revised 7 May 2014; Accepted 2 June 2014; Published 24 June 2014

Academic Editor: Joonhyuk Kang

Copyright © 2014 Tommaso Cella et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

In this paper we evaluate the feasibility of short range outdoor mm-wave MIMO links in the 70 GHz portion of the E-band (71–76 GHz). We use phased arrays in order to strongly reduce the impact of the multipath components, thus making the channel mainly line-of-sight (LOS). We design the array using a simple patch as a single element and simulate the performances for a 200 m link and a MIMO system with equal element spacing at the transmitter and the receiver. Each node of the MIMO system consists of a uniform rectangular array (URA) where the single element is a patch antenna, in order to achieve higher gains and narrow beams. Such configuration is much more compact compared to the antennas currently employed for the same bandwidth. We optimize the interelement distances at the transmitter and the receiver and evaluate the capacity achievable with different array sizes. The results show that, for the proposed link budget, capacity up to 29 bit/s/Hz is achievable at a range of 200 m, with practical dimensions. We also show that the beamforming capabilities make the design much more flexible than the single reflector antenna systems. In the last part of the paper, we verify that our antenna can also operate in rainy conditions and longer ranges.