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An internal WWAN mobile phone antenna formed by a coupled-fed PIFA and a simple printed monopole to integrate with a USB connector is presented. The proposed antenna is suitable to be mounted at the bottom of the mobile phone, and the USB connector integrated therein serve as a data port for the mobile phone. In addition, the antenna requires a small footprint of less than 10 × 60 mm2 on the system circuit board and shows a thin thickness of 3 mm, making it suitable for slim mobile phone applications. The coupled-fed PIFA in the proposed antenna generates a wide lower band for the GSM850/900 operation (824~960 MHz), while the printed monopole contributes a resonant mode at about 1800 MHz to incorporate a higher-order resonant mode of the coupled-fed PIFA at about 2050 MHz to form a wide upper band covering the GSM1800/1900/ UMTS operation (1710~2170 MHz). Penta-band WWAN operation is hence achieved for the proposed antenna. The SAR results for the proposed antenna with the presence of the head and hand phantoms are also studied. The obtained results are presented and discussed.