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Source: www.ese.upenn.edu
File size: 431.25 KB
File type: pdf
Last download on:
Thu Mar 22, 2012 08:01:20 AM
Short Desciption:
While single antenna elements radiate signals in a broad distribution pattern,
antenna arrays manipulate and concentrate signals in a given direction. The radiation
pattern of an array is the cumulative effect of constructive and deconstructive interference
among the individual antenna elements.
Summary:
This research project is based on previous work done by Dwight L. Jaggard and
Aaron D. Jaggard on fractal ring arrays. We utilize fractals in the fabrication of a class of
Cantor ring arrays. Fractal descriptors such as dimension, stage of growth, and lacunarity
are applied in designing and characterizing these Cantor rings. Using the continuous
arrays developed by Jaggard and Jaggard as a point of reference, we examine the design
of analogous discrete arrays. We examine various ways of periodically and randomly
thinning and building up these arrays azimuthally. The arrays are compared to their
periodic and random counterparts as well as the continuous case to evaluate performance.
Mainbeam quality, sidelobe level, and visible range are used to rate the arrays. The
Cantor ring arrays and the corresponding array factors are simulated using programs
developed in MATLAB. Our goals include developing fractal arrays that have low
sidelobes comparable to those of periodic arrays while maintaining the robustness of
random arrays. We aim for superior fractal performance at an equal number of elements
as the periodic and random cases, as well as comparable performance using fewer
elements.
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"SPARSE CANTOR RING ANTENNA ARRAYS WITH NON-UNIFORM ELEMENT SPACING"
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