Abstract-A tri-band slotted F-shaped antenna with dualpolarization characteristics for wireless applications is presented. The crooked gap and F-shaped monopole are optimized to achieve triband operation of 2.4, 3.5 and 5.8 GHz with −10 dB impedance bandwidths of 20%, 14.1%, and 13.6%, respectively. Furthermore, by properly inserting an F-shaped strip on the wide-slot ground, the circular polarization (CP) with a 19% (3.3-4 GHz) 3 dB axial ratio bandwidth is obtained. The proposed antenna has a compact dimension of 42×40×1.6 mm 3 . A prototype of the antenna is fabricated and tested, and an agreement with simulated results is obtained.