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http://dx.doi.org/10.5515/KJKIEES.2009.20.11.1217

A Study on the Control of Asymmetric Sidelobe Levels and Multiple Nulling in Linear Phased Array Antennas  

Park, Eui-Joon (School of Electronic Engineering, Kumoh National Institute of Technology)
Publication Information
The Journal of Korean Institute of Electromagnetic Engineering and Science / v.20, no.11, 2009 , pp. 1217-1224 More about this Journal
Abstract
This paper newly proposes a methodology towards computing antenna element weights which are satisfying asymmetric sidelobe levels(SLLs) specified arbitrarily on both sides of the main beam pattern, in the linear phased array antenna pattern synthesis problem. Opposite to the conventional methods in which the element weights are directly optimized from the array factor, this method is based on the optimum perturbations of complex roots inherent to the Schelkunoff's polynomial form which is described for the array factor. From the proposed methodology, the capability of nulling the directions of multiple jammers is also possible by independently perturbing only the complex roots corresponding to each jamming direction, hence allowing an enhancement of the simplicity of the numerical procedure by means of a proper reduction of the dimension of the solution space. The complex weights over the array are then easily computed by substituting the optimally perturbed complex roots to the Schelkunoff's polynomial. Some examples are examined and numerically verified by substituting the extracted weights into the array factor equation.
Keywords
Phased Array Antennas; Beam Pattern Synthesis; Nulling;
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