Modeling of Miniaturized, Multiband and Ultra-Wideband Fractal Antenna

Due to advancements in communication technology, there is an increase in the demand of small size, low cost, multiband and wideband antennas. With a view to address these demands, a fractal design was employed in this study. Despite the advantages provided by these antennas, miniaturization and performance enhanced further by using a partial ground plane. This research work presents an antenna which is based on the well-known Sierpinski Carpet fractal with iteration factor of 1/3. The antenna was designed up to third iteration with a view of achieving miniaturization. A simple antenna was designed for purpose of comparison, by using a simple rectangular slot at the middle of the patch and a 34.88% size reduction was achieved at the same resonant frequency. This is achieved by introducing defected ground structure into the design which gives the antenna wideband behaviour with bandwidth of 442MHz at centre frequency of 2.45GHz. A multiband square patch antenna using third order Sierpinski Carpet was designed to operate at 1.88GHz alongside a new circular fractal antenna up to third iteration with a partial ground structure to achieve ultra wideband behaviour with a bandwidth of 8.18GHz at centre frequency of 2.54GHz. The designed antenna was simulated using three dimensional finite integration time domain commercial software microwave studio. The objective of this thesis to design a fractal antenna with small size, multiband and wideband behaviour was largely met. Keywords: Miniaturized, Multiband and Ultra Wideband antenna, Fractal geometries, Partial Ground Structure.