Multiport Antenna Systems for Space-Time Wireless Communications
Doctoral thesis, 2013

Multiport antenna systems are indispensable part of modern wireless communication systems. Their crucial impact on the overall performance requires sufficient regard and dedication to a precise design and characterisation. This concern has been to a considerable extent addressed in the frame of the current thesis. The thesis starts by a brief review of the evolution on wireless communication systems. In particular, the role of multiport antennas in modern communication systems is highlighted. The multidisciplinary nature of multiport radiation terminals makes them the subject of many research groups worldwide, resulting in inconsistent nomenclature. Thus, a few words are dedicated to throwing light upon some important metrics in this discipline. The notion of richness threshold as a further crucial performance metric is introduced. The importance of the latter parameter is emphasised by virtue of some practical examples. We describe how an RF Butler network can be used to remarkably enhance the performance of spatial diversity systems. Subsequently, the advantage of a predictor antenna system in modern moving relays is underlined. We illustrate and quantify how the coupling removal can improve the prediction capability of this system. This can be most conveniently carried out through signal processing, amplifying the prediction reliability. To verify the foregoing achievement, some results associated with measurements in actual scenarios are presented. Moreover, a quick and inexpensive measurement of antennas in multipath environments is of foremost concern for antenna system designers. This issue is simply possible by reverberation chamber technologies. We briefly clarify how further analysis can be utilised to facilitate measurements in these chambers. At the end, we devote a short discussion to some state-of-the-art antenna designs which are suitable for the modern compact mobile terminals, manifesting certain rewarding features.

Spatial Correlation

Multiport Matching Efficiency

Multiport Antennas

Uncorrelated Multipath.

Richness Threshold

Multiport Effective Length

Pattern Overlap Matrix

Multiport Effective Area

Non-rich Multipath

Covariance Matrix

Predictor Antenna System

Correlated Multipath

Room EE, 6th floor, Hörsalsvägen 11, Department of Signals and Systems
Opponent: Professor Michael Jensen


Nima Jamaly

Chalmers, Signals and Systems, Communication and Antenna Systems, Communication Systems

Compact Formulas for Diversity Gain of Two-Port Antennas

IEEE Antennas and Wireless Propagation Letters,; Vol. 9(2010)p. 970-973

Magazine article

A Revisit to Spatial Correlation in Terms of Input Network Parameters

IEEE Antennas and Wireless Propagation Letters,; Vol. 11(2012)p. 1342-1345

Journal article

Efficiency characterisation of multi-port antennas

Electronics Letters,; Vol. 48(2012)p. 196-197

Journal article

Fast Measurement of Antenna Pattern Overlap Matrix in Reverberation Chamber

Electronics Letters,; Vol. 49(2013)p. 318-319

Journal article

Areas of Advance

Information and Communication Technology

Subject Categories

Electrical Engineering, Electronic Engineering, Information Engineering



Room EE, 6th floor, Hörsalsvägen 11, Department of Signals and Systems

Opponent: Professor Michael Jensen

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