ITEE seminar: Dr. H. T. Hui, 09.00AM, Tue 28 Oct 2003

An Effective Method for the Compensation of Mutual Coupling Effect in Adaptive Antenna Arrays

Speaker: Dr. H. T. Hui, Nanyang Technological University, Singapore

When: 09.00AM, Tuesday 28 Oct 2003

Venue: 78-420

Host: Professor Stuart Crozier

Abstract:

  The performance of an adaptive antenna array is strongly affected by
  the existence of the mutual coupling effect between the antenna
  elements.  Many attempts have been made to reduce or compensate for
  this effect.  Hardware on-the-site calibration has been used before
  but high cost is one of the problems associated with it.  On the
  other hand, the possibility of removing or compensating for the
  mutual coupling effect in the received array signals has been
  explored by many researchers.  Up to now, the most practical
  approach is the so called open-circuit voltage method.  This method
  derives the open-circuit voltages from the measured antenna terminal
  load voltages by using the mutual impedances of the antenna
  elements.  Despite the advantage of simplicity and practicability of
  this method, it suffers from two drawbacks in that its use of the
  conventional mutual impedance ignores the presence of other antenna
  elements and its use of an over-simplified assumption of the current
  distributions reduces its accuracy.  In this seminar, a new,
  effective, and practical method for the compensation of the mutual
  coupling effect is introduced.  Unlike the open-circuit voltage
  method, the new method seeks to find the coupling-free voltages
  across the antenna terminal loads instead of finding the open
  circuit voltages.  Through the introduction of a new definition of
  mutual impedance, the new method has been shown to produce a much
  stronger compensation power.  The detailed formulations of the new
  method will be introduced in the seminar.  The calculation method
  and the measurement procedure for the new mutual impedance will be
  presented.  Significantly improved performances for some simple
  antenna arrays in direction finding and interference suppression
  have been obtained by using the new method and will be discussed in
  the seminar.  Measurement results for the new mutual impedance will
  also be presented for the first time in seminars.

Biography:

 
  Dr. Hon Tat Hui received the B.Eng. (Hons) degree with first class
  honors from the City University of Hong Kong (City U) in 1994 and
  Ph.D in 1998, all in Electronic Engineering.  From 1998 to 2001, he
  was a research fellow in City U.  In the middle of 2001, he joined
  the Nanyang Technological University in Singapore as an Assistant
  Professor.  Dr. Hui is a Member of IEEE.  He is also a Corporate
  Member and Chartered Engineer of IEE.  He was in the organizing
  committee of the Third International Conference on Information,
  Communications and Signal Processing (ICICS 2001) and the Fourth
  International Conference on Information, Communications and Signal
  Processing and the Fourth IEEE Pacific-Rim Conference On Multimedia
  (ICICS-PCM 2003).  Dr Hui has a wide range of research interest in
  Wireless Communication Methods and Techniques.  His current
  interests include the MIMO communication method, the UWB
  communication method, diversity technique in mobile communications,
  smart antenna technology, satellite communications, etc.  Dr. Hui
  has also extensive research experience in antenna design and
  analysis.  He has designed novel antennas and antenna arrays for
  mobile communications, for satellite communications, and for
  diversity operations.  Except these, Dr Hui has also a strong
  interest in numerical calculation methods in Electromagnetics and
  has extended the MoM to complex media.  In the field of his
  profession, Dr. Hui has published 30 papers in internationally
  referred journals and presented many papers at international
  conferences.  Dr. Hui was listed both in the MARQUIS WHO'S WHO IN
  THE WORLD and MARQUIS WHO’S WHO IN SCIENCE AND ENGINEERING.

Contact:

Professor Stuart Crozier, seminar host (stuart@itee.uq.edu.au)
or Guido Governatori (ITEE seminar co-ordinator) (guido@itee.uq.edu.au)

ITEE seminar web page: http://www.itee.uq.edu.au/~seminar

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