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

Lau, Buon Kiong LU and Bach Andersen, Jørgen (2007) IEEE International Conference on Information, Communications and Signal Processing (ICICS), 2007 In 6th International Conference on Information, Communications & Signal Processing, 2007 p.1015-1019
Abstract
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... (More)
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. (Less)
Please use this url to cite or link to this publication:
author
organization
publishing date
type
Chapter in Book/Report/Conference proceeding
publication status
published
subject
in
6th International Conference on Information, Communications & Signal Processing, 2007
pages
1015 - 1019
publisher
IEEE--Institute of Electrical and Electronics Engineers Inc.
conference name
IEEE International Conference on Information, Communications and Signal Processing (ICICS), 2007
external identifiers
  • wos:000256699500214
  • scopus:50449099907
ISBN
978-1-4244-0982-2
DOI
10.1109/ICICS.2007.4449747
project
Radiosystem: Fundamental Limits of Compact MIMO Systems (VR, BKL)
Radiosystem: Antennas, channel models, and wave propagation for future wireless networks, (VINNOVA, AM/GK/FT)
language
English
LU publication?
yes
id
112af429-5a45-4497-a907-97873d956542 (old id 794670)
date added to LUP
2007-12-27 09:55:01
date last changed
2018-06-11 14:11:31
@inproceedings{112af429-5a45-4497-a907-97873d956542,
  abstract     = {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.},
  author       = {Lau, Buon Kiong and Bach Andersen, Jørgen},
  booktitle    = {6th International Conference on Information, Communications & Signal Processing, 2007},
  isbn         = {978-1-4244-0982-2},
  language     = {eng},
  pages        = {1015--1019},
  publisher    = {IEEE--Institute of Electrical and Electronics Engineers Inc.},
  title        = {Direction-of-arrival estimation for closely coupled arrays with impedance matching},
  url          = {http://dx.doi.org/10.1109/ICICS.2007.4449747},
  year         = {2007},
}