A compact planar monopole antenna suitable for Wireless Personal Area Network (WPAN) application is proposed. By simply modifying the periphery of a rectangular patch, effective operational band 2.95 to 16.8GHz is achieved. This band sufficiently covers the operating band, 3.1-10.6GHz, of the new Wireless Personal Area Network (WPAN) using Ultra Wide Band (UWB) technique. A prototype of the proposed antenna is fabricated and measured to verify the simulated performances of the proposed antenna. The antenna provides fractional bandwidth of 138%, peak antenna gain of 2.4dBi.