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Performance enhancement of smart antennas with reduced element spacing

By Heinz J Chaloupka, Xin Wang and Jacob Coetzee

Abstract

This paper addresses the problem of degradations in adaptive digital beam-forming (DBF) systems caused by mutual coupling between array elements. The focus is on compact arrays with reduced element spacing and, hence, strongly coupled elements. Deviations in the radiation patterns of coupled and (theoretically) uncoupled elements can be compensated for by weight-adjustments in DBF, but SNR degradation due to impedance mismatches cannot be compensated for via signal processing techniques. It is shown that this problem can be overcome via the implementation of a RF-decoupling-network. SNR enhancement is achieved at the cost of a reduced frequency bandwidth and an increased sensitivity to dissipative losses in the antenna and matching network structure

Topics: 090699 Electrical and Electronic Engineering not elsewhere classified, adaptive beamforming, smart antennas, mutual coupling
Publisher: IEEE
Year: 2003
DOI identifier: 10.1109/WCNC.2003.1200387
OAI identifier: oai:eprints.qut.edu.au:48966

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