Fractal Sectoral Monopole Antenna for UWB Band Applications

摘要

This paper proposes a fractal monopole antennabased on a sectoral-shaped patch. To improve thegain of the proposed antenna over a larger bandwidth,the matching was enhanced by attaching two rectangularstubs to the feeding line. The antenna, which is built onan FR4 epoxy substrate with ε_r =4.3 and a loss tangentof 0.018 has a compact size of 28 mm×31 mm×1.6 mm.The antenna covers the UWB range and extends to aboutthe 22 GHz frequency, as well as offers omnidirectionalradiation patterns. The optimized configuration was fabricatedand tested. The impedance bandwidth of the proposedantenna is about 155 with a reflection coefficientbetter than ?10 dB and has a maximum gain of nearly4 dBi with a relatively stable omnidirectional radiationpattern.