中文摘要：

为了提高常规Vivaldi天线低频段前向辐射增益,避免超宽带天线对某些已有频段的影响,提出了一种覆盖1.2~14 GHz的具有陷波特性的高增益超宽带端射天线。该天线通过在辐射贴片两侧加载Y形缝隙,有利于天线表面电流向槽线汇聚,使天线的辐射特性明显提高。低频部分（1.2~7.5 GHz）的增益比原始天线提高最多2d B,通过使用CSRR结构,实现了对WLAN应用频段（5.125~5.825 GHz）的隔离,使该天线具有陷波特性。最终,对天线实物进行加工和测试,进一步验证了设计的可靠性。

英文摘要：

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.