volume | PIER Journals

Abstract

Faulty elements (FEs) in a two-dimensional array (TDA) directly impact the performance and configuration of the coverage pattern due to the long operation of the antenna system. Therefore, the process of dealing with these failed elements, knowing their locations, and reducing their negative impact in practice is the main goal of designing a large TDA. In this article, three types of FE locations (faulty random elements, faulty clustered elements, and faulty subarray elements) are studied. Based on the genetic algorithm (GA), the damaged coverage pattern due to the presence of these failed elements is recalculated. The method relies on re-optimizing the amplitude-only weights of non-FE optimally while neglecting the the defective elements. Therefore, the entire TDA elements do not need to be redesigned again but rather rely on the working elements only. This gives great simplification for recalculating the coverage pattern. To further control the coverage pattern in terms of the main beam width in terms of the directivity (D), the first null to null beam width (FNBW) and the sidelobe level (SLL), a fitness function is added to the optimization process under specific constraints. Simulation results for different scenarios are presented to demonstrate the validity and effectiveness of the proposed approach for dealing with FE.

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Dr. Ahmed Jameel Abdulqader