Multiband Antenna Design Based on Descartes Circle Theorem

Self-similar slots, known as fractal geometries, are widely used to enhance the bandwidths of the patch antennas. In this study, Descartes Circle Theorem (DCT) is used to obtain the fractal geometries for four iterations. Dual and wideband are achieved by applying CPW-fed Circular Fractal Antenna (CFA) for half- wave length applications. The design and simulation of this study are carried out by using CST Microwave Simulation Software. Two wideband responses were obtained, 23 % at resonance 1.08 GHz, and 3 % at 1.82 GHz. The resonant frequency was lowered by 51.3 %. The directivity was 6.54 dB when the original design was deployed where it was 3.97 dB and 6.72 dB for the resonant frequencies 1.08 GHz and 1.82 GHz respectively. Additionally, U and H ground cut designs are proposed and simulated. Bandwidths of 45 % at resonate frequency of 1.004 GHz and 55.9 % at resonate frequency of 0.958 GHz were achieved respectively. Keywords: circular fractal antenna, CPW-fed, Descartes Circle Theorem, self –similar iteration, bandwidth