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A novel dual band CPW-fed antenna with symmetrical L-strips is presented for WLAN and WiMax applications. The proposed antenna is composed of a square ring feedline with a pair of L-strips added to it for building the radiator structure. By employing these strips, antenna can yield two different resonances to cover the desired bands while maintaining small size and simple structure. Based on this concept, a prototype of antenna is fabricated and tested. The experimental results show that the antenna has the impedance bandwidths of 930 MHz (2.48-3.54 GHz) and 290 MHz (5.12-5.41 GHz), which can cover both WLAN in the 5.2 GHz band and WiMax in the 2.5/3.5 GHz bands.