International Symposium on Antennas and Propagation


Session Number:2C14



Searching for the Optimal Shapes of Ultra-Wideband Monopole Antennas

Kian Paran,  Masoum Fardis,  Ali Abolghasemi,  


Publication Date:2008/10/27

Online ISSN:2188-5079


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The optimization of ultra-wideband (UWB) monopole and dipole antennas are mostly done by choosing a particular shape and tuning the geometrical parameters of it [1]-[3]. In few works, optimization has been performed not to obtain the optimum parameters of a particular shape, but to find the optimal shape of antenna [4]-[6]. In these works, the geometry of antennas is described in a general manner allowing the antennas to take different shapes during the optimization process. However, none of these general descriptions could produce all or most of the shapes for UWB monopole and dipole antennas which have been reported in the literature. Some of these general descriptions are also incompatible with some optimization methods like genetic algorithm (GA). In this paper, a new approach to UWB antenna design is described. This approach is based on a general description for the geometry of UWB monopole antennas which is capable of producing almost all possible shapes for these antennas. This general description is also compatible with different optimization methods (especially GA). In this work, the general description is used for the optimization of non-planar rotationally-symmetric monopole antenna with finite ground plane.