A novel ultra-wideband (UWB) monopole antenna with triple band-notched functions is presented. A pair of folded multiple-mode resonators (MMR) symmetrically coupled to the feed line are utilized to generate triple notched bands for WiMAX, WLAN and downlinks of X-band satellite communication, respectively. The centre frequencies and band gaps between them can be tuned by varying the length and width of the MMR. Simulated and measured results of the proposed antenna have been displayed and good agreement between them has been achieved.