Omnidirectional UWB Monopole Antenna With WLAN Notched-band Functionality

This paper introduces a novel ultra-wideband (UWB) microstrip antenna having wireless local area network band rejection characteristics. The proposed antenna is composed of a lip-shaped radiation patch being fed by a ۵۰ Ω coplanar waveguide (CPW) feed line. The ground vertically continued to the two sides of the radiator. Thus, the substantial extra space adjacent to the radiator can be efficiently saved. The band rejection in the wireless local area networks (WLAN) (۵.۱۵-۵.۸۲۵GHz) is secured through etching the two symmetric C-shaped slots on ground plane to preclude interference between UWB and WLAN systems. The proposed antenna is of the size of ۳۰×۳۰×۱.۶ working within the range of ۲.۹۶ to ۱۱.۲ GHz with VSWR lower than ۲ except  in ۵.۱۵-۵.۸۲۵GHz band. Finally, the antenna is simulated and fabricated with nearly omnidirectional radiation patterns, stable gain and constant group delay in the operating band.