Novel dual element antenna arrays suitable for small devices of MIMO applications have been designed and fabricated. The antenna elements have semi-printed structure, are fractaly shaped and operate in ISM(2.4GHz -2.489GHz) band as well as between 5GHz and 6GHz. Although the size of the designed antenna prototypes are small and the elements are positioned too close to each other, correlation coefficients lower than 0.1 and satisfactory levels of Mean Effective Gain have been obtained. Index Terms-Fractal antennas, MIMO antennas, Multi-band Antennas, Mean Effective Gain 1536-1225 (c)

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In this article a reconfigurable antenna for WLAN/WiMAX applications is presented. A super-shape radiator of an ellipsis shape is used to achieve wider intrinsic bandwidth compared to the classical rectangular patch antenna, while the dimensions remain comparable. The proposed antenna is fed at two points exciting both horizontal and vertical polarization but in different operating frequencies. To achieve wider bandwidth, as a whole but also for each polarization, the symmetrical feeding points for each excitation are also employed with a proper feeding network. PIN diodes are also used in the feeding network to provide the option of narrower bandwidth. The antenna substrate is Rogers RO4003C with dielectric constant εr = 3.55 and dissipation losses tanδ = 0.0027 with height h = 1.524 mm. The antenna operates in the range of 2.3 GHz to 2.55 GHz but, using the proposed procedure, it can be designed for different frequency ranges.

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