A Novel Compact Ultra-Wideband Antenna with Single and Double Band Rejection

Band-notch characteristic has been of great interest recently to overcome the electromagnetic interference of ultra-wideband systems (uwb) with other existing ones. in this paper, we present a novel microstrip-fed antenna with band rejection property appropriate for uwb applications. band-notch characteristic has been achieved by adding a rectangular resonant element to the ground section. a prototype was fabricated and measured based upon optimal parameters. experimental results show consistency with simulation results. measurement results confirm that the antenna covers the uwb band and satisfies a band rejection in the frequency span of 5 ghz to 5.7 ghz to restrain it from interference with wireless local area network (wlan). then, to achieve better isolation, a rectangular strip is appended to the band-notch creating part of the ground section to enhance obtained vswr up to 30 through simulation. in addition, by applying a similar technique, a dual band-notched characteristic with an average simulated vswr of around 13.75 has been achieved for wlan and the downlink of x band satellite communication systems with each more than 10. features such as small size, omnidirectional pattern and perfect isolation make the antenna suitable for any uwb applications.