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.
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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|Item Type:||Journal Article|
|Keywords:||superdirective arrays, adaptive beamforming, mutual coupling, decoupling network|
|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 13:10|
|Last Modified:||14 Mar 2012 01:51|
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