Fitness Function Calculation Technique in Yagi-Uda Antennas Evolutionary Design

Yagi-Uda antennas is the one of most simple type of wire antennas in different applications. A design of these antennas turned of to be the complex problem. It is connected with complexity of definition of current distributions on antennas vibrators. This currents distribution can be used for account of external and internal antenna parameters. These parameters are used for fitness function calculation, which allowing finding the optimum decision of designing problem. The chosen fitness function should include both external, and internal antennas parameters. Hallens integral equation application for current distribution definition on Yagi-Uda antennas vibrators is considered in this paper. It is shown, that the examination of frequency dependencies of input resistance and currents amplitudes distributions can in addition simplify a design of the antenna.