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A miniaturised modified planar inverted-F UWB antenna with a broadband rectangular feeding structure, for a Wireless Body Area Network (WBAN), is proposed. The antenna is designed to cover a wide frequency range from 3 GHz to 13 GHz. Details of the proposed antenna design and measured results are presented and discussed. To validate the results, a prototype was fabricated and tested. The measured and computed results are in good agreement. The overall size of the antenna including the ground plane is 50 mm × 50 mm × 8 mm, making it suitable to fit into a standard enclosure of a UWB wireless transceiver.