ABSTRACT A compact antipodal Vivaldi antenna with stable end-fire radiation properties over the bandwidth of more than 15:1 is proposed for UWB applications. The gradient titled corrugated edges used to redistribute the antenna surface electric fields are employed to extend the low-end cutoff frequency and increase the low-frequency antenna boresight gain. The asymmetric parasitic patch composed of two triangular patches with different height is introduced to couple more energy from radiating arms of the antenna and thus enhancing mid- and high-frequency gain. The proposed antenna is designed and optimized in detail. To validate the proposed design, a prototype is fabricated and measured. The simulation results are in good agreement with the experimental data. Measurement results show that, the gain variation of the proposed antenna is in the range of 5.4–13.7 dBi over 2.88–40 GHz with the a compact dimension of 40 mm×73 mm×0.508 mm. The compact dimension of the antenna makes it a good candidate for UWB applications.

中文翻译：

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用于 UWB 应用的混合技术改进紧凑型对映 Vivaldi 天线的辐射特性

摘要 一种紧凑的对映 Vivaldi 天线在超过 15:1 的带宽上具有稳定的端射辐射特性，用于 UWB 应用。用于重新分配天线表面电场的倾斜波纹边缘用于扩展低端截止频率并增加低频天线视轴增益。引入由两个不同高度的三角形贴片组成的非对称寄生贴片，以从天线的辐射臂耦合更多能量，从而提高中高频增益。所提出的天线经过详细设计和优化。为了验证所提出的设计，制造并测量了原型。模拟结果与实验数据吻合较好。测量结果表明，所提出的天线的增益变化在 2.88-40 GHz 范围内为 5.4-13.7 dBi，具有 40 mm×73 mm×0.508 mm 的紧凑尺寸。天线的紧凑尺寸使其成为 UWB 应用的理想选择。