Abstract: A compact CPW-fed planar UWB antenna with triple band-notched property is presented. The proposed antenna is CPW-fed with a diamond patch and a rectangle wide slot. The triple band rejection is achieved by etching a U-shaped slot on the radiation patch and adding two pairs of L-shapes parasitic strips onto the rectangle slot. The fabricated antenna has a tiny size, only 32mm ×32mm ×0.508mm. The experimental and measured results show that the proposed antenna exhibits an impedance bandwidth over an ultra-wideband frequency range from 2.6 to 11.5GHz with VSWR less than2, except three stopbands at 3.15 ~ 3.80 GHz, 5.20 ~ 5.80 GHz and 8.2~ 8.7GHz for filtering the WiMAX, WLAN and ITU 8GHz band signals respectively. It also demonstrates a nearly omnidirectional radiation pattern and a stable gain. The simulated results are compared with the measured performance, and show good agreements.