A COMPACT TRI-BAND PIFA ANTENNA FOR WLAN AND WiMAX APPLICATIONS

摘要

A tri-band planar inverted-F antenna (PIFA) for WLAN and WiMAX applications is proposed. By combining F-T-shaped slots in the radiating structure and using a trapezoidal feeding plate, three resonant modes are generated and impedance bandwidth of the antenna is enhanced. The fabricated radiation patch has a compact size of 25×11×8 (mm)~3 with a rectangular ground plate of 26×40 (mm)~2. For S11 less than -10 dB, the antenna operates at 2.45 GHz with a bandwidth of 170 MHz, and at 5.2 GHz with a bandwidth of 750 MHz for WLAN application, and at 5.75 GHz with a bandwidth of 540 MHz for WiMAX application.