OICC Press Majlesi Journal of Electrical Engineering 2345-3796 10 2 2024 02 20 Omnidirectional UWB Monopole Antenna With WLAN Notched-band Functionality EN Zahra Bastani 2-Department of Engineering and Technology, Shiraz Branch, Islamic Azad University, Shiraz, Iran Mohammad Amin Honarvar Department of Electrical Engineering, Najafabad Branch, Islamic Azad University, Najafabad, Iran Masoud Jabari Department of Electrical Engineering, Marvdasht Branch, Islamic Azad University, Marvdasht, Iran Journal Article 2024 02 20    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 50 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) (5.15-5.825GHz) 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 30×30×1.6 working within the range of 2.96 to 11.2 GHz with VSWR lower than 2 except  in 5.15-5.825GHz band. Finally, the antenna is simulated and fabricated with nearly omnidirectional radiation patterns, stable gain and constant group delay in the operating band.