Pattern Diversity with Multi-mode Circular Patch Antennas in Clustered MIMO Channels
Antonio Forenza∗, Frank Sun, and Robert W. Heath Jr.
WNCG, ECE Department, The University of Texas at Austin, TX, USA
The throughput that a MIMO channel can support is a function of different array parameters such as element spacing, number of antennas and array geometry [1], [2]. Although there is significant prior work, the emphasis is on spaced array configurations. In typical MIMO systems, the size constraints often prevents the antennas from being placed far apart (e.g., antenna placement in notebook computers or mobile phones). Therefore, spatial diversity technique may not provide the complete solution for next generation wireless handsets. An alternative technique for miniaturized antenna designs is polarization/pattern diversity [3]–[6], where the antennas are designed to radiate with orthogonal radiation patterns and polarizations as a means to create uncorrelated channels across different array elements. The benefits of pattern diversity have been shown in [6]. That analysis however did not use realistic channel models. In this contribution we aim to extend the analysis in [6] to clustered channel models, adopted by the IEEE 802.11n standard body for wireless local area networks (WLANs). We analyze MIMO arrays consisting of circular microstrip antennas to enable pattern diversity and compare their performance against conventional uniform linear arrays. We will also model the effect of mutual coupling as in [7] and measure the performance egradation produced by the near-field effects. Hereafter, we briefly review the channel model and the properties of circular microstrip antennas. Then, we analytically compute the spatial correlation coefficients and evaluate the MIMO channel capacity.
IEEE Antennas and Propagation Society International Symposium
2005
June
3B
438-441
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