Efficient optimization of a Yagi-Uda antenna using genetic algorithm

QC 20170607
In this paper, Yagi-Uda antenna is studied and analyzed considering a single mode cosine current distribution on all elements. A classical approach is taken for the analysis, by viewing Yagi antenna as a center-driven dipole array in which all but the actual exciter element are short-circuited at the terminals. Currents are induced in the elements via the mutual impedances, and radiation occurs as from a set of discrete sources. The mutual impedance matrix of the array is calculated using the induced EMF method and integral equations for the electric field. This analysis has led to a fast and efficient code to calculate Yagi parameters. The validity of the results has been checked with a MoM solution using NEC2 and good agreement has been observed. Then, the code is used together with a genetic algorithm in order to optimize Yagi-Uda antenna for gain maximization. A 31-element high gain Yagi with 19.2dB gain and the gain bandwidth of 8 percent is derived. Also the Pareto fronts are plotted for Yagi antennas with different number of elements which shows the trade off between the directivity and front to back lobe(F/B) ratio.

Ingår i:ANTEM 2005 - 11th International Symposium on Antenna Technology and Applied Electromagnetics, Conference Proceedings: Institute of Electrical and Electronics Engineers (IEEE)9780973842500

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TEKNIK OCH TEKNOLOGIER: TEKNIK OCH TEKNO ...; och Elektroteknik oc ...; och Signalbehandling

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