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2 2017

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Synthesis and Failure Correction of Flattop and Cosecant Squared Beam Patterns in Linear Antenna Arrays

Patidar H., Mahanti G. K., Muralidharan R.

Journal of Telecommunications and Information Technology

2017

nr 4

25--30

This paper deals with the synthesis of ﬂattop and cosecant squared beam patterns using the ﬁreﬂy algorithm which is based on metaheuristics. This synthesis is followed by the correction of the radiation patterns when unfortunate malfunctioning of the individual elements in the array occurs. The necessary attention is given to the recovery process, with due emphasis on reduction of side lobe level, ripple and the reﬂection coeﬃcient. Simulation in Matlab shows a successful employment of the ﬁreﬂy algorithm in producing voltage excitations of the good elements necessary for the recovered patterns. The performance of the ﬁreﬂy algorithm in failure correction is validated by duly comparing it with a standard benchmark.

A Comparative Analysis of Evolutionary Algorithms for Synthesis of Scanned Linear Array of Mutually Coupled Parallel Dipole Antennas

Patidar H., Mahanti G. K., Muralidharan R.

International Journal of Electronics and Telecommunications

2017

Vol. 63, No. 2

151--157

This paper presents a comparative analysis of three evolutionary algorithms, namely, Backtracking Search Algorithm, Cuckoo Search Algorithm and Artificial Bee Colony Algorithms for synthesis of a scanned linear array of uniformly spaced parallel half wavelength dipole antennas. Here, antenna parameters, namely Side Lobe Level, reflection coefficient and wide null depth are taken into consideration for comparison between algorithms. In addition to it, statistical parameters, namely best fitness value, mean and standard deviation of the fitness values obtained from algorithms are compared. Mutual coupling that exists among the antenna elements is included in obtaining radiation patterns and the self-impedances along with the mutual impedances are calculated by induced Electro-Motive Force method. Two different examples are shown in this paper to validate the effectiveness of the utilized approach. Although, this approach is applied to a linear array of dipole antennas; this can be utilized for other array geometries as well.