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A novel Bezier spline-based geometry for printed monopole antennas is presented. Quadratic curves are used to describe the outline of the radiating element. The geometry is optimised by a genetic algorithm. A small number of control points are used to define the geometry, ensuring a small search space for the GA. The resulting antenna has an impedance bandwidth from 1.44 to 14.7 GHz
John, M., Ammann, M.: Spline Based Geometry for Printed Monopole Antennas. Electronics Letters, Vol.43. March 15, 2007.