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A novel triple-band CPW-fed antenna for WLAN and WiMAX applications is proposed, which can obtain impedance bandwidths of 2.34-2.50, 3.07-3.82, and 5.13-5.89-GHz with reflection coefficient less than -10-dB. The proposed antenna has a rectangular ring and an S-shaped strip attached to the feedline, with a crooked U-shaped strip and three straight strips on the bottom layer. The antenna has been successfully simulated, fabricated and measured. The measured results, which agree well with the simulated ones, show good impedance matching, nearly omnidirectional radiation patterns, and stable gains.