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Direction-of-arrival estimation for closely coupled arrays with impedance matching

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Author

Summary, in English

Conventionally, the spacing between adjacent elements in an antenna array are set at half-a-wavelength in order to obtain maximum spatial resolution while avoiding spurious sidelobes. However, for antenna arrays that are implemented in a compact manner, the spacing between the adjacent elements can be significantly less than half-a- wavelength. The small spacing between the antennas results in strong mutual coupling between the antennas, which has been shown to affect the performance of array algorithms, through modifying the antenna pattern and reducing the antenna efficiency. Recently, impedance matching techniques have been proposed for multiple antenna systems for diversity and MIMO applications, in order to counteract the aforesaid coupling effects. In this paper, we study the impact of different impedance matching conditions on the Cramer-Rao bound performance of direction-of-arrival estimation using closely coupled arrays. We demonstrate that an appropriate matching network can drastically improve the CRB performance with respect to 50 ohm termination or self impedance termination with coupling, and the case of ideal antenna arrays with no coupling. For example, a tenfold reduction in RMSE over the simple matching terminations was obtained with the multiport conjugate match for a two signal scenario and an antenna separation of 0.1 wavelength.

Publishing year

2007

Language

English

Pages

1015-1019

Publication/Series

6th International Conference on Information, Communications & Signal Processing, 2007

Document type

Conference paper

Publisher

IEEE - Institute of Electrical and Electronics Engineers Inc.

Topic

  • Electrical Engineering, Electronic Engineering, Information Engineering

Conference name

IEEE International Conference on Information, Communications and Signal Processing (ICICS), 2007

Conference date

2007-12-10 - 2007-12-13

Conference place

Singapore, Singapore

Status

Published

Project

  • Radiosystem: Fundamental Limits of Compact MIMO Systems (VR, BKL)
  • Antennas, channel models, and wave propagation for future wireless networks, (VINNOVA, AM/GK/FT)

Research group

  • Electromagnetic theory
  • Radio Systems

ISBN/ISSN/Other

  • ISBN: 978-1-4244-0982-2