UWB small slot antenna with WLAN frequency band‐stop function

Abstract

A new design of a multi‐resonance small slot antenna with variable band‐notched function for ultra‐wideband (UWB) applications is proposed. The proposed slot antenna consists of a square radiating stub and a ground plane with a pair of L‐shaped parasitic structures and an inverted T‐shaped strip protruding inside the rectangular slit, which provides a wide usable fractional bandwidth of more than 135% (2.98–16.73 GHz), while showing the band rejection performance in the frequency band of 5.05–5.9 GHz to avoid any interference from wireless local area network systems. The designed antenna has a small size of 20 × 20 × 0.8 mm 3 . Simulated and experimental results obtained for this antenna show that it exhibits good radiation behaviour within the UWB frequency range.