In this paper, a single layer dual band bended strip monopole antenna is presented for WLAN and WiMAX applications. The structure of the antenna is simple, which consists of a single bended strip and a microstrip-fed line. The proposed antenna is printed on the low-cost FR4-epoxy substrate (relative permittivity is 4.4) of one side and defected ground plane on the other side of the substrate. The overall dimension of the substrate is 35x50x1.6 mm³. The antenna may cover two separate bands, the lower band of WLAN and upper band of WiMAX. The resonance frequency of lower and upper bands of the antenna can be controlled by the geometry of the bended strip. The – 10 dB impedance bandwidths of 450 MHz, centred at 2.41 GHz (percentage bandwidth is 18.6 %) and 1180 MHz centred at 5.7 GHz, (percentage bandwidth is 20.7 %). The detail performances of the proposed antenna are demonstrated along with measured and simulated results. The results are good in agreement.

Keywords: Dual band, Monopole, Bandwidth, WLAN, WiMAX