Abstract: This paper proposes a high gain ultra-wideband and end-fire antenna with notched frequency characteristics which covers 1. 2 ~14 GHz band to overcome small forward gain at low frequency of conventional Vivaldi antenna, and avoid the influence of other frequency ranges. By adding Y-shaped apertures on both sides of the radiation patch, the surface cur- rent of antenna converges near the through line, so the radiation property is improved. The gain of low frequency part (1. 2 ~ 7.5 GHz) is increased up to a maximum value of 2 dB compared with the original antenna. And it insulates the frequency band of WLAN (5. 125 ~5. 825 GHz) by using CSRR structure to make sure the antenna with notched frequency characteris- tics. At last, the test results of the fabricated antenna demonstrate the reliability of the design.