Dual band‐notched monopole antenna with enhanced bandwidth for ultra‐wideband wireless communications

Abstract

A new configuration of an ultra‐wideband (UWB) dual band‐notched antenna is presented. The designed geometry consists of octagonal radiating patch, a 50 Ω microstrip feed‐line on the front and an asymmetric partial ground on the back. For impedance bandwidth enhancement, a unilateral stepped structure is utilised on the ground. By etching two E‐shaped slots connected to each other on the radiating patch and applying E‐shaped defected ground structure on the back, dual notched bands are achieved. The antenna is printed on a low profile FR4 substrate with a compact size of 25 × 18 × 1 mm 3 . The experimental results indicate that the antenna has an impedance bandwidth from 2.55 to 21.65 GHz for voltage standing wave ratio ≤2, except the notched bands on worldwide interoperability for microwave access and wireless local area network bands. Moreover, stable radiation patterns and gains within the operating band are shown.