NDLI: Interleaved Ultrawideband Antenna Arrays Based on Optimized Polyfractal Tree Structures

Content Provider	IEEE Xplore Digital Library
Author	Petko, J.S. Werner, D.H.
Copyright Year	1963
Abstract	There is considerable interest in interleaving multiple phased array antennas into a single common aperture system. Current phased array antenna technology is limited to narrowband operation, leading to the appearance of grating lobes and strong mutual coupling effects when they are incorporated into the design of a common aperture system. To overcome this obstacle, a new class of arrays, called polyfractal arrays, has been introduced that possess natural wideband properties well suited for large-scale genetic algorithm optimizations. These arrays also possess recursive beamforming properties and an autopolyploidy-based chromosome expansion that can dramatically accelerate the convergence of a genetic algorithm. In addition, a robust Pareto optimization can be applied to reduce the peak sidelobe levels at several frequencies throughout the intended operating band, leading to ultrawideband antenna array designs. Because of their lack of grating lobes, these polyfractal arrays are ideal building blocks for interleaved antenna array systems. This paper develops these concepts, first creating ultrawideband array designs based on polyfractal geometries and then interleaving these designs into a common aperture system. Several examples of interleaved systems are discussed, with one two-array system possessing a peak sidelobe level of nearly -18 dB with no grating lobes over a 20:1 bandwidth with either of the component array mainbeams steered independently up to 60° from broadside.
Sponsorship	IEEE Antennas and Propagation Society
Starting Page	2622
Ending Page	2632
Page Count	11
File Size	2194667
File Format	PDF
ISSN	0018926X
Volume Number	57
Issue Number	9
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2009-09-01
Publisher Place	U.S.A.
Access Restriction	One Nation One Subscription (ONOS)
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Ultra wideband technology Ultra wideband antennas Antenna arrays Tree data structures Phased arrays Gratings Interleaved codes Aperture antennas Genetic algorithms Aperture coupled antennas ultrawideband Autopolyploidy common aperture fractal arrays fractal-random arrays genetic algorithms (GA) interleaved arrays polyfractal arrays polyploidy
Content Type	Text
Resource Type	Article
Subject	Condensed Matter Physics Electrical and Electronic Engineering

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