Compact Dual-Band Dual-Ring Printed Monopole Antennas for WLAN Applications

Three dual band planar monopole antennas for wireless local area network (WLAN) application are proposed. The antennas have common configuration in the form of rectangular, rhombic and annular double rings. All the antennas use the self similarity property to exhibit dual band characteristics. The proposed antennas covers the frequency bands of the IEEE 802.11a/b/g (2.4-2.48 GHz, 5.15-5.35 GHz and 5.725-5.825 GHz), and have radiation patterns that are; almost omnidirectional in the H-plane, and like monopole pattern in the -plane. The simulation results are analyzed and compared with measured results for verification.