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Title: A superdirective 3-element array for adaptive beamforming
Authors: Chaloupka, H.J.
Wang, X.
Coetzee, J.C. 
Keywords: Adaptive beamforming
Mutual coupling
Superdirective arrays
Issue Date: 20-Mar-2003
Citation: Chaloupka, H.J., Wang, X., Coetzee, J.C. (2003-03-20). A superdirective 3-element array for adaptive beamforming. Microwave and Optical Technology Letters 36 (6) : 425-430. ScholarBank@NUS Repository.
Abstract: 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 an RF-decoupling network (RF-DN) and its simple realization are shown. The array with closely spaced elements together with the RF-DN represent 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. © 2003 Wiley Periodicals, Inc.
Source Title: Microwave and Optical Technology Letters
ISSN: 08952477
DOI: 10.1002/mop.10782
Appears in Collections:Staff Publications

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