DESIGN AND ANALYSIS OF FRACTAL ANTENNA FOR MIMO APPLICATION
by Nitika Sharma
Abstract
With the advancement in the wireless technologies, the antenna designers have been challenged to come up with compact, high-performing, easy-to-fabricate antennas with a high radiation efficiency to keep up with the increasing demands. In presented work, a new multiband fractal antenna for MIMO applications is proposed. To design a MIMO fractal antenna, initially we designed a hybrid fractal antenna. Using a combination of Koch and Minkowski curves placed on the boundary of the rectangular patch. The proposed antenna is designed on a RT- duriod and FR4 substrate having thicknesses of 3.175 mm and 1.47 mm, respectively. Antenna is resonant at three resonance frequencies. The element antenna is also verified experimentally for both the substrate, the simulated and experimental results showed a satisfying agreement. The simulation of 2×2 MIMO antenna is done in IE3D software in which elements are placed at different separation distances like 8 mm, 10 mm, 15 mm, 18 mm etc and their characteristic parameters are analyzed for distinct distances. After studying their performance for different distances, the antenna is fabricated for 18 mm separation distance. Diversity performance of the antenna in terms of envelope correlation coefficient (ECC) is calculated with the help of MATLAB program. The value for both substrates is less than 0.0007, which is greater than threshold value 0.5. The MIMO antenna is fabricated on the FR4 substrate. The fabricated prototype is verified experimentally with the help of vector network analyzer. Measurement results are similar to simulation results.
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