Design of Koch Fractal Bowtie Antenna for Multiband Applications

Abstract

This paper investigates the design and performance of Koch Fractal Bowtie antenna. The
concept and geometry of fractal antennas such as Koch has been used in the conventional
bowtie antenna to obtain multiband behaviour which is considered as very important criteria
in current antenna design trends. The evaluation of Koch fractal antenna is made up to two
iterations.The overall dimension of both Koch fractal antenna is 110x70 mm2 .The final
design is able to operate at frequencies such as 4.1 GHz, 5.6 GHz, 5.7 GHz and 5.8 GHz with
a gain of 0.3 dB, 4.0 dB, 5.6 dB and 9.1 dB respectively.The measured gain of the antenna is
greater than other fractal antennas. The fractal antenna is successfully simulated and
evaluated using ANSYS HFSS.