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

Research output: Contribution to conferencePaper, not in proceeding


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.


Research areas and keywords

Subject classification (UKÄ) – MANDATORY

  • Electrical Engineering, Electronic Engineering, Information Engineering
Original languageEnglish
Publication statusPublished - 2007
Publication categoryResearch
Event3rd COST2100 Management Committee Meeting, 2007 - Duisburg, Germany
Duration: 2007 Sep 102007 Sep 12


Conference3rd COST2100 Management Committee Meeting, 2007