Fitness function calculation technique in Yagi-Uda antennas evolutionary design

Yagi-Uda antenna is the one of the most simple types of wire antenna in different applications. A design of these antennas turned out to be a complex problem. It is connected with complexity of definition of current distributions on antenna´s vibrators. This current distribution can be used for account of external and internal antenna parameters. These parameters are used for fitness function calculation, which allows finding the optimum decision of designing problem. The chosen fitness function should include both external, and internal antennas parameters. Hallen´s 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 dependences of input resistance and current amplitudes distributions can in addition simplify a design of the antenna.