As the ultra-wideband (UWB) system is easy to be interfered by narrowband signals, this paper proposed an UWB bandpass filter for the suppression of interference from WLAN and satellite communication signals. The main resonator structure consisted of the multimode resonator (MMR) loaded with a Tshape stub. The improved Tshape stub increased two transmission zeros, and reduced the filter size. Two bandnotched characteristics were achieved by coupling opensquareloop resonators. The desired notch frequencies could be obtained by adjusting the size of resonators. The measured results showed that the filter size was just 16.7 mm×8.5 mm, and the center frequency is 6.9 GHz with the passband of 3.0 to 10.8 GHz. Two notch bands centered at 5.8 GHz and 8.04 GHz with the lowest attenuation point at -27 dB and -18 dB respectively. The measured results are in sound agreement with simulation results.