Multiband behavior of wideband Sierpinski fractal bow-tie antenna

This paper presents bow-tie printed antenna design and simulation based on dipole antenna concepts and its simulation using FDTD method. The wideband response is obtained for this structure. Then IE3D software is used to implement three fractal shapes on the basic configuration. This antenna as a wideband solution is used in monolithic wireless communication applications that require multi-resonance frequencies. These features can be improved by fractalizing the antenna. While the bandwidth of the antenna can be changed by different flare angles, its fractalizing controls the multiband feature without any significant change on the radiation pattern. Numerical and measurement results of the antenna radiation characteristics, including return loss and radiation pattern, are presented and compared for mode-2, mode-3 and mode-5 Sierpinski fractal shapes which is implemented on the basic CPW-fed bow-tie antenna. Numerical radiation patterns are obtained in resonance frequencies and self-similar property in return loss and radiation pattern is demonstrated.