Abstract
AbstractDiversity and MIMO are useful antenna technologies to improve transmission quality and to increase capacity for wireless communication systems. In order to achieve good performance, a certain space is required for these antenna configurations. However, the space is a very critical issue for portable terminals. In this paper, the relation between antenna spacing and the receiving level correlation are empirically investigated for diversity and MIMO antennas. Experiments were carried out in a room using dipole and small ceramic antennas operating at 2.4/2.6 GHz bands in order to verify the results collected from the experiments. A simulation was conducted under the same configuration. Theoretically, the correlation is over 0.8 if the antenna spacing is less than 0.1λ. However, experiments have shown that the correlation between antenna elements is under 0.5 for diversity and MIMO configurations even though the antenna spacing is very small. When antenna is located near a metal cylinder simulating the human head, the correlation is 0.1 higher. These results promise the application of a small size MIMO antenna for portable terminals. The results of the various measurements are useful to design actual portable terminal using MIMO antenna. Copyright © 2007 John Wiley & Sons, Ltd.
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