Capacity of Linear Rectangular Microstrip Antenna Arrays

Conference: EuCAP 2009 - 3rd European Conference on Antennas and Propagation
03/23/2009 - 03/27/2009 at Berlin, Germany

Proceedings: EuCAP 2009

Pages: 4Language: englishTyp: PDF

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Kalialakis, Christos (Thessaloniki Regional Office, Spectrum Directorate, EETT-Hellenic Telecommunications and Post Commission, Thessaloniki, State Airport, Thessaloniki 55103, Greece)
Collado, Ana; Georgiadis, Apostolos (Communications Subsystems, Centre Tecnologic de Telecomunicacions de Catalunya, Av. Canal Olimpic s/n 08860 Castelldefels, Barcelona, Spain)

In this work, the dependence of the capacity of 2xM MIMO systems on the mutual coupling between the transmitting and receiving antennas is investigated taking into account the correlation coefficient given by Clarke’s model. Linear arrays of microstrip rectangular antennas are considered both in the transmitting and the receiving ends. The effect of the mutual coupling between microstrip antenna elements on the capacity of the system for several array configurations is studied. Additionally, the impact of non-ideal impedance matching of the antenna elements is investigated. Assuming an infinite array approximation for coupling, it is shown that for element separations more than a half wavelength, coupling has negligible effect on the capacity compared to the uncoupled case. Furthermore, it is shown that the impedance mismatch has a significant effect on capacity. It is also shown that in the case of a 2x2 MIMO system the angle variation of the coupling has a relatively small impact on the capacity.