Effect of Mutual Coupling on the Performance of Direction-of-Arrival Estimation of Compact Array
Hoi-Shun Lui (1), Yantao Yu (2), Hon Tat Hui (2)
(1) Department of Signals and Systems, Chalmers University of Technology, Gothenburg, Sweden, (2) Department of Electrical and Computer Engineering, National University of Singapore
With the recent advancement in microwave hardware, there has been significant focus on developing compact antenna arrays with element separation less than half wavelength. Direction-of-arrival (DOA) estimation is an important application for antenna arrays but yet not much work has been done on DOA estimation using compact arrays. In particular, as the element separation becomes smaller, the undesirable mutual coupling effect between antenna elements becomes much stronger which can significantly degrade the accuracy of DOA estimation. Hui [1]-[4] has proposed the receiving-mutual-impedance method (RMIM) which demonstrates the superior performance of mutual coupling compensation over conventional-mutual-impedance method (CMIM) [5]-[6]. Recently, we have further improved the RMIM and applied it to mutual coupling compensation for compact arrays [4]. In this paper, we would like to investigate how this RMIM method performs for compact arrays with different omni-directional antenna elements. In particular, dipoles, monopoles and normal-mode helical antennas (NMHAs) are considered. DOA estimation using the Matrix Pencil Method (MPM) [7]-[8] will be used as a platform to investigate how the RMIM and MPM perform in mutual coupling compensation for DOA estimation.
IEEE Antennas and Propagation Society International Symposium (APSURSI)
2010
July
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