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

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 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: Buon Kiong Lau; Jørgen Bach Andersen
• Department/s: Department of Electrical and Information Technology
• Publishing year: 2007
• Language: English
• Document type: Conference paper
• Topic: Electrical Engineering, Electronic Engineering, Information Engineering
• Conference name: 3rd COST2100 Management Committee Meeting, 2007
• Conference date: 2007-09-10 - 2007-09-12
• Conference place: Duisburg, Germany
• Status: Published
• Research group: Radio Systems; Electromagnetic theory