Printed Egg Curved Monopole Antenna for Ultrawideband Applications

This paper presents a novel egg curve based design of ultrawideband (UWB) printed monopole antenna (40x40 mm(2)). The egg curve is obtained by introducing an egg shaping parameter into standard elliptic curve equation. The variation in impedance bandwidth (BW) with different parametric variations of design curve is studied. A comparative study of Egg Curved Monopole Antenna (ECMA) with planar binomial curved monopole antenna proposed by Ling et al. and semi-elliptic monopole slot antenna for UWB systems proposed by Gopikrishna et al. is also presented. The proposed ECMA is designed, fabricated and measured to verify the theoretical design. Good agreement between the simulated results and the measured ones is observed. The results show that the proposed egg curved monopole antenna can obtain a measured bandwidth of 117.92% (2.84-11.0 GHz) which is also its simulation bandwidth. A stable gain of about 2.2-2.9 dBi with gain variation less than 1 dBi and consistent radiation patterns and nearly constant group delay are measured over the entire UWB bandwidth (3.1-10.6 GHz).