Compact dual-band printed monopole antenna for WLAN application

Abstract

A microstrip-fed dual-band antenna with omnidirectional radiation patterns in the azimuth plane is proposed. It can provide two separate impedance bandwidths of 0.25 GHz (2.3–2.55 GHz) and 0.85 GHz (5.1–5.95 GHz), so that it easily covers the required bandwidths for wireless local area network applications. The proposed antenna is composed of a rectangular monopole and a folded strip whose end is coupled to the monopole by a narrow gap. It occupies an area of only 6.5×14 mm when printed on an FR4 substrate with a thickness of 1.5 mm.