Abstract: In this paper, the genetic algorithm (GA) optimization is applied to the design
of a U-type ultra wide-band (UWB) antenna. The ladder configuration is used to improve impedance bandwidth of the U type antenna. The genetic algorithm combined with finite-different time-domain (FDTD) is applied to optimize this antenna and get the antenna size. The measured VSWR is less than 2 from 3.1 GHz to 10.6 GHz. The designed antenna has a good radiation characteristic with the gain between 3.3~6.0 dB according to the simulation.

Key words: finite-different time-domain (FDTD), ultra wide-band
(UWB) antenna, genetic algorithm (GA)