Band-notched UWB slot antenna

Abstract

This article presents a new design of ultrawideband (UWB) microstrip slot antenna with band-notched function around 5–6 GHz to avoid any interference from the wireless local area network (WLAN) systems. The proposed antenna consists of a square radiating stub with a rotated C-ring slot, a feed-line and a slotted ground plane with an S-shaped parasitic structure inside an extra rectangular slot. By cutting a rectangular slot on top of the ground plane and also by embedding an S-shaped parasitic structure inside the slot, a new resonance at the higher frequencies is excited and hence much wider impedance bandwidth can be produced, which provides a wide usable fractional bandwidth of more than 135%. In the proposed design, to generate the WLAN band-stop property, the rotated C-ring slot was inserted at the radiating stub. Simulated and measured results are presented to validate the usefulness of the proposed antenna structure for UWB applications. The proposed monopole antenna configuration is simple, easy to fabricate and has a small size of 20 × 20 × 0.8 m3. © 2014 Wiley Periodicals, Inc. Microwave Opt Technol Lett 56:1744–1747, 2014