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Different fractal structures have been widely used in many antennas designs for various applications. A fractal antenna is used for miniaturization and multiband operation. This paper presents a design of a dual-band fractal antenna fed by coplanar waveguide (CPW) transmission line. The proposed antenna is designed and fabricated on an FR4 substrate with a volume of 70x60x1.6mm3, resonates at 2.42-2.62GHz and 3.40-3.65GHz with a return loss less than -10dB. The design and simulation process is carried out by using CST-MW studio electromagnetic solver. Simulation results show that the resulting antenna exhibits an interesting dual frequency resonant behavior making it suitable for dual band communication systems including the ISM and WiMAX applications. Concerning the fabrication and measurement of the final prototype of this antenna, a good agreement is found between simulation and measurement results for both frequency bands.

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This paper presents a new design of a multi-band inverted F antenna structure (PIFA) fed by a coaxial line. The design tool is the CST-MW software which uses the finite element method. To create new resonances frequencies it is necessary to insert slits of various forms on the radiation element. The final validated circuit is designed to operate in the Industrial Scientific and Medical (ISM 2.4-2.5GHz), Wireless Local Area Network (WLAN 5.15-5.35 GHZ) and Worldwide Interoperability for Microwave Acces (WiMAX 3.30-3.80). Obviously, it has been found that the radiation patterns of the antenna shown are similar to the bidirectional radiation pattern. For simulated The properties of the antenna, such as return losses and radiation patterns, we used CST-Mw Studio.