Fractal Antennas are one of the most important and useful types which exhibit wide band and multiband behavior. In this paper a Sierpinski monopole fractal antenna is designed and analyzed with FDTD method. It has both multiband and wideband features and have stable radiation pattern in wide frequency ranges such as 3.3GHz to 4.1 GHz and 8.2 GHz to 9.2 GHz. The antenna is designed on a substrate with permittivity of 2.1, 1.5 mm thickness and fed with 50 ohm microstrip line. The antenna has a compact size of 89.9mm × 102.65 mm.
