An internal planar inverted-F antenna (PIFA) for 2.4 GHz Bluetooth and 5 GHz WLAN applications is presented. The proposed antenna has all impedance bandwidth of I 10 MHz in Bluetooth band and 900 MHz near 5 GHz in WLAN band within 2:1 VSWR, and all approximately omnidirectional radiation pattern can be obtained. These features are Suitable for 2.4/5 GHz WLAN applications.