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A compact design of a flexible planar inverted-F antenna (PIFA) is proposed for triple-band (GSM/DCS/PCS) mobile phone applications. The main radiating element of the antenna, which generates the GSM and DCS resonant modes, is printed on a flexible printed circuit board (FPCB) and rolled in a form of cylinder. To enhance the bandwidth of the high band, a metallic rod working as a parasitic element of the antenna is introduced into the antenna design. The antenna prototype was fabricated and measured. Good agreement between the measurement and simulation results can be achieved.