Evaluation_of_4_antenna_systems

Evaluation_of_4_antenna_systems - Evaluation of the...

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Evaluation of the performances of several four-antenna systems in a reverberation chamber A. Diallo (1) , C. Luxey* (1) , P. Le Thuc (1) , R. Staraj (1) , G. Kossiavas (1) , M. Franzen (2) , P.-S. Kildal (3) (1) LEAT, University of Nice-Sophia Antipolis/UMR-CNRS 6071 250 rue Albert Einstein, Bât. 4, Les Lucioles 1, 06560 Valbonne, France Tél : +33 4 92 94 28 58, Fax : +33 4 92 94 28 12 E-mail : aliou.diallo@unice.fr (2) Bluetest AB, Gothenburg, Sweden, Email : magnus.franzen@bluetest.se (3) Chalmers University of Technology, Gothenburg, Sweden, Email : simon@elmagn.chalmers.se INTRODUCTION Nowadays, the use of wireless mobile communications is growing exponentially in several fields of telecommunications. Transferring large amounts of data is clearly needed and consequently, increasing the transfer rate is more and more required. The performances of a wireless terminal can be greatly improved by introducing some diversity scheme in the communication link. In practice, the handset can be considered to operate in a so-called multi- path propagation environment. This means that the electromagnetic field which carrying the information will take many simultaneous paths between the transmitter and the receiver. To take advantage of this propagation scenario, one solution is to integrate more than one radiating element in the terminal. The antennas of the handset must therefore be properly designed, the most relevant parameters being the envelope correlation, the total efficiency and the diversity gain. Several multi-antenna systems have been already designed and evaluated by other colleagues [1-5]. Some multi- antenna structures have been also designed, fabricated and measured at the LEAT of the University of Nice. Particularly, a neutralization effect implemented between two Planar Inverted-F Antennas (PIFAs) operating on a small ground plane in close frequency bands has been demonstrated to achieve high isolation and high total efficiency [6]. Recently, several two and four antenna-systems, all working in the UMTS frequency band (1920-2170 MHz) have been characterized in terms of S ij parameters and Wheeler Cap total efficiency measurements [7]. It has been proven that these structures have a strong potential for an effective diversity at the terminal side of a wireless link. However, their fully characterization in urban conditions (uniform multi-path propagation environment) needs some particular facilities and the associated expertise [8]. The researchers of the antenna group at Chalmers Institute of Technology already possess these capabilities through the Bluetest reverberation chamber. This paper results from a short-term mission granted by the COST 284 where the antenna-design competences of the LEAT have been gathered with the measurement skills of Chalmers Institute of Technology. Three multi-antenna prototypes have been characterized in the Bluetest reverberation chamber in terms of total efficiency and diversity gain. Particularly the performances of an initial
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This note was uploaded on 05/19/2010 for the course ELECTRICAL ECSE 493 taught by Professor Tholengoc during the Spring '10 term at McGill.

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Evaluation_of_4_antenna_systems - Evaluation of the...

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