Design of koch fractal bow tie antenna for wireless applications

The crowding of wireless band has necessitated the development of multiband and wideband wireless antennas. Because of the self similar characteristics, fractal concepts have emerged as a design methodology for compact multiband antennas. A Koch-like fractal curve is proposed to transform ultra-wideband (UWB) bow-tie into so called Koch-like sided fractal bow-tie dipole. A small isosceles triangle is cut off from center of each side of the initial isosceles triangle, then the procedure iterates along the sides like Koch curve does, forming the Koch-like fractal bow-tie geometry, used for multiband applications. ADS software is used to design the proposed antennna. It has covers the applications like GSM, wireless band and other wireless communications. Keywords—fractal; koch curve; bow tie antenna; ADS(Advanced Design System);