Compact Wideband Microstrip Antenna for Universal 5GHz WLAN Applications

A microstrip-fed compact antenna with omnidirectional radiation patterns in the azimuth plane is proposed. It provides an impedance bandwidth of 41% (from 4.5 to 6.82GHz) below 10dB and below 14dB it attains 37.3% (from 4.62 to 6.74GHz), so that it easily covers the required universal 5GHz bandwidths for wireless local area network applications (WLAN) The proposed antenna is composed of a square spiral patch and a partial ground plane with a small rectangular stub. It occupies an area of only 14 x 15mm when printed on an FR4 substrate with a thickness of 1.6mm