Compact Super Wide Band Printed Monopole Antenna with a Band Notched Function

Abstract

A 25×25mm2 implementation of a microstrip-fed printed monopole antenna for the future super wideband (SWB) wireless systems
application is presented. It has features of possesses band notched function (from 4.88 to 6.07GHz), extremely wide impedance bandwidth
(from 2.58 to 40GHz) and its compact size. By using a smooth tapering between the semi fractal-shaped patch and the half ellipse-shaped
defected ground plane, the super wide impedance bandwidth is achieved with ratio bandwidth larger than 15.5:1. Furthermore by carving an
open-loop rectangular-shaped slot (OLRS) on the patch, a band notched characteristic is obtained. Numerical and experimental results are in
good agreement and they indicate that the proposed antenna has a measured 2:1 VSWR bandwidth of 175.76%, except the rejected WLAN
band