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 Journal of the Korean Institute of Electromagnetic and Science 2006;6(1):53-61.
 Parametric Studies for the Optimum Design of a Hexagonal Plate Monopole Antenna Seong-Bae Park, Joung-Min Park, Bierng-Chearl Ahn, Kyung-Seok Kim School of Electrical & Computer Engineering, Chungbuk University Abstract In this paper, we present parametric studies for the optimum design of a hexagonal plate monopole antenna. The dependence of the antenna performance on various geometric parameters is investigated using a commercial electromagnetic software, from which an optimum design of a hexagonal plate monopole antenna is derived. Guidelines for determining initial parameter values are given. The diameter of the circular ground plane is minimized tlo 1/5 wavelength at the lowest operating frequency. The antenna impedance matching is controlled by adjusting the gap between the plate and the ground plane, the plate base width, and the base bevel angle. The antenna proposed in. this paper shows a reflection coefficient less than -10 dB and a $2.0{sim}6.2$ dBi gain over $3{sim}20$ GHz frequencies. Key words: Hexagonal Pate Monopole, Ultra-Wdeband Antenna, Parametric Studies
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