A planar hexa-band internal antenna designed for mobile phone applications is presented. The antenna occupying a small area of 45x12mm2 is placed on the top no-ground portion of the system circuit board with a ground-plane size of 45x100mm2. The design begins with constructing a meandered monopole. With a parasitic and an impedance-adjustment structure subsequently added, the resulting antenna can be viewed as a printed planar inverted-F antenna with a parasitic resonant element. Two wide impedance bands can be generated by the designed antenna to support GSM 850, GSM 900, DCS, PCS, UMTS and 2.4-GHz WLAN operations.