A mutual coupling model for MIMO systems
Ozdemir, M.K.; Arslan, H.; Arvas, E.
Wireless Communication Technology, 2003. IEEE Topical Conference on
Volume , Issue , 15-17 Oct. 2003 Page(s): 306 - 307
Digital Object Identifier 10.1109/WCT.2003.1321534
Summary: Wireless communication systems employing multielement antennas (MEAs) are affected by mutual coupling. Accurate and simple models of mutual coupling are essential for better system analysis. In a MEA, mutual coupling depends on the antenna element separation, geometry of array and antenna elements, location of antenna elements in the array, frequency, substrate thickness and constant, near-field scatterers, and direction of arrival (DOA) of the incoming wave. Except near-field scatterers and DOA, the rest of the parameters are fixed for a given MEA system. Since the feeding network for a MIMO system is fixed and most of the mutual coupling is due to surface waves, DOA dependency can be removed for a MIMO mutual coupling model. In this paper, a previously proposed model for mutual coupling is modified to be applicable to MIMO systems. The effect of near-field scatterers on the mutual coupling is specifically investigated to validate the model. Commercially available EM simulators are utilized for this purpose. Once the effect of near-field scatterers is characterized, correlation properties between antenna elements in a MEA can be obtained more accurately and correlation estimation algorithms can be developed accordingly.
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