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Spatial multiplexing by decomposing the far-field of a compact ESPAR antenna

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  • Communication
  • Design
  • Engineering


2013 International Workshop on Antenna Technology (iWAT) Agile and Efficient MIMO System for Smart Phone Terminals Osama N. Alrabad(, Elpiniki P. Tsakalaki, Mauro Pelosi, Gert F. Pedersen Antennas, Propagation & Radio Networking Section, Aalborg University, Niels Jernes Vej 12 A6-2, 9920 Aalborg, Denmark Emails:[email protected] ABSTRACT: The paper proposes a novel multi-input multi-output (MIMO) system architecture that covers most of the high L TE bands. The system is comprised of four small loop antennas. Each antenna has two ports, one for communication and one for control. The control port is used for tuning the loop antenna where impressive frequency agility using a single capacitor is obtained. A good level of inherent isolation among the four loop antennas is maintained over the different frequency bands. The MIMO performance of the proposed system is evaluated through its spectral efficiency versus frequency. Finally, the information bandwidth of the MIMO system can be defined by comparing its spectral efficiency against the spectral efficiency of three ideal MIMO antennas. Index Terms --- Agile antennas, MIMO, Spectral efficiency. SECTION I. INTRODUCTION Future generations of mobile devices rely on MIMO technology to deliver on the promises of boosted data rates and higher system performance. However, the performance of mobile devices is especially sensitive to the antenna design and a host of other factors that were less significant in single-antenna designs. This places more emphasis on understanding the interrelationship among the handset antennas, the device metallic frame (handset chassis), the user and the far-field scattering channel. MIMO systems may optimally operate as a data-rate multiplier (spatial multiplexer) when the handset antennas and the propagation channel are in good conditions i.e. when the handset antennas are efficient and the channel has enough scattering. While communication engineers are at the mercy of the propa

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