Advanced

Impact of impedance matching on direction-of-arrival estimation of compact antenna arrays

Lau, Buon Kiong LU and Bach Andersen, Jørgen (2007) 3rd COST2100 Management Committee Meeting, 2007
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 of compact antenna arrays. We demonstrate that an appropriate matching network can drastically improve the CRB performance with respect to both 50 ohm termination and the case of ideal antenna arrays with no coupling. For example, a ten-fold reduction in RMSE 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
Contribution to conference
publication status
published
subject
conference name
3rd COST2100 Management Committee Meeting, 2007
language
English
LU publication?
yes
id
a3313cf1-985a-4e51-944f-f3e8f06c68b8 (old id 1269053)
date added to LUP
2008-11-20 12:58:34
date last changed
2016-04-16 12:26:09
@misc{a3313cf1-985a-4e51-944f-f3e8f06c68b8,
  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 of compact antenna arrays. We demonstrate that an appropriate matching network can drastically improve the CRB performance with respect to both 50 ohm termination and the case of ideal antenna arrays with no coupling. For example, a ten-fold reduction in RMSE 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},
  language     = {eng},
  title        = {Impact of impedance matching on direction-of-arrival estimation of compact antenna arrays},
  year         = {2007},
}