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中文摘要：
针对常规Vivaldi天线尺寸大、低频段前向辐射增益低的问题,设计了一款覆盖2.7～18.3GHz的小型化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形缝隙的方法,将天线表面电流汇聚于槽线附近,使天线的辐射特性明显提高。改善天线的阻抗匹配特性,展宽天线带宽,提高天线的增益,增强天线端射效果,天线的尺寸仅为25mm×25mm×1mm,实现了小型化。低频部分（2.7～8GHz）增益比原始天线提高最大值为3.5dB。通过天线实物的加工和测试,进一步验证了设计的可靠性。
英文摘要：
The paper proposes a miniaturized,high-gain,ultra-wideband and end-fire antenna which covers2.7～18.3GHz band to overcome the large size and small forward gain at low frequency of conventional Vivaldi antenna.By adding Y-shaped apertures on both sides of the radiation patch,the surface current of antenna converges near the through line,so the radiation property is improved,including the impedance bandwidth,the antenna gain and the end-fire effect.The size of the antenna is only 25 mm×25 mm×1mm,thus achieving a significant miniaturization.The gain of low frequency part（2.7～8GHz）is increased to a maximum value of 3.5dB compared with the original antenna.The test result of the fabricated antenna demonstrates the reliability of the design.
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