Fractal geometry technique is a successful way for RF component miniaturization, and this is the requirement of modern communication circuits. This thesis is intended to propose a BPF based on fractal geometry, to get miniaturized filters for ISM band applications at 2.4 GHz. Koch and Sierpinski carpet fractal geometries have been used, the Koch shape allows reduced coupling coefficients between adjacent resonators, therefore this geometry can be used for the design of narrow band filters. The Sierpinski carpet has larger fractal dimension than other fractal geometries (larger size miniaturization).This objective has been carried out in three steps: In the first step a dual mode BPFs based on modified Koch pre-fractal with two perturbations techniques corner cut and cross slotted perturbations up to the 3rd iterations were designed and simulated. A comparison between the two techniques has been done. The technique which gives higher miniaturization is used in the next step. In the second step a BPF using Sierpinski Carpet fractal is designed and simulated. Its results are compared with those of modified Koch pre-fractal BPF. In the third step selectivity enhancement is presented to get narrower and sharper filter responses, by design and simulation of four pole (4th order) BPF. The modified Koch with cross slotted perturbation has been used to design a four pole filter since it has more size reduction and less radiation loss than the filter designed using modified Koch with corner cut perturbation. Finally a comparison between this thesis work and previous works has been done. Results show that these filters possess good transmission and return loss characteristics, besides the miniaturized sizes meeting the design specification of most of wireless communication systems. Size reduction percentage as compared with conventional square patch resonator operating at the same frequency and using the same substrate material for the 3rd iteration of modified Koch with cross slotted perturbation is 74.01 %. The simulation and filter responses of all filters presented in this thesis have been carried out using the method of moment (MoM) electromagnetic simulator of Microwave Office 2009, from Advanced Wave Research (AWR).