A superdirective 3-element array for adaptive beamforming

Chaloupka, Heinz J, Wang, Xin, & Coetzee, Jacob (2003) A superdirective 3-element array for adaptive beamforming. Microwave and Optical Technology Letters, 36(6), pp. 425-430.

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A small array composed of three monopole elements with very small element spacing on the order of λ/6 to λ/20 is considered for application in adaptive beamforming. The properties of this 3-port array are governed by strong mutual coupling. It is shown that for signal-to-noise maximization, it is not sufficient to adjust the weights to compensate for the effects of mutual coupling. The necessity for a RF-decoupling network (RF-DN) and its simple realization are shown. The array with closely spaced elements together with the RF-DN represents a superdirective antenna with a directivity of more than 10 dBi. It is shown that the required fractional frequency bandwidth and the available unloaded Q of the antenna and RF-DN structure determine the lower limit for the element spacing.

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17 citations in Web of Science®

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ID Code: 48949
Item Type: Journal Article
Refereed: Yes
Keywords: superdirective arrays, adaptive beamforming, mutual coupling, decoupling network
DOI: 10.1002/mop.10782
ISSN: 0895-2477
Subjects: Australian and New Zealand Standard Research Classification > ENGINEERING (090000) > ELECTRICAL AND ELECTRONIC ENGINEERING (090600) > Electrical and Electronic Engineering not elsewhere classified (090699)
Divisions: Current > Schools > School of Electrical Engineering & Computer Science
Current > QUT Faculties and Divisions > Science & Engineering Faculty
Copyright Owner: Copyright 2003 Wiley Periodicals, Inc.
Deposited On: 02 Mar 2012 03:10
Last Modified: 13 Mar 2012 15:51

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