Miniaturized Uwb Triangular Microstrip Antenna Using Fractal Approach For Microwave Imaging Applications
Résumé: Original compact and efficient ultra-wide band (UWB) triangular microstrip antenna is made by applying Sierpinski triangle carpet to the patch of an initial UWB triangular antenna having stair shaped partial ground plane. The miniaturized triangular microstrip antenna has a compact dimension of 22.60 x 18.85 mm2 , which represents 69.50% of dimension reduction. It exhibits good return loss with fractional bandwidth over 127% from (3.56 to 16.20 GHz), nearly omnidirectional energy patterns and linearly increasing gain ranging from (0.83 to 4.72 dB) over the entire bandwidth. In addition to all these characteristics satisfying UWB applications, the designed antenna offers good time domain response in term of fidelity factor, upper than 96% and good group delay over its whole operating bandwidth which makes it suitable for microwave imaging applications. Prototype of the UWB miniaturized triangular patch antenna was also performed and studied experimentally. The measured results show a good promise with those simulated which validate the design procedure and confirm the benefits of miniaturization.
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