Abstract: In order to filter the interference of narrowband signals to UWB communication systems, the paper studies and designs an UWB antenna with five band-notched characteristics. The design feeds by microstrip-line. Band rejection characteristics are realized by etching an elliptical open-loop resonator in the radiating patch and making four different-sized U-shaped parasitic stubs besides the feedline. The antenna size is 30 mm×40 mm×0. 8 mm. The simulation experiment shows that the antenna operating frequency range is 2. 8-12 GHz, effectively filters WiMAX band (2. 94-3. 42 GHz), INSAT band (4. 42-4. 53 GHz), WLAN band (5. 32-5. 5 GHz), the X-band uplink frequency (7. 01-7. 27 GHz) and the X-band downlink frequency (7. 57-8. 05 GHz). The measured results show that the antenna has a good performance index in working bandwidth, directivity, gain and five band-notched characteristics.