The traditional Vivaldi antenna is well known for its ultrawide bandwidth, but low gain. To enhance the radiation characteristics, we propose a new method by adding an additional structure that supports spoof surface plasmon polaritons (SSPP) as the parasitic element. The proposed patch has an enhanced gain over whole frequency band without deteriorating the bandwidth. The Sommerfeld–Zenneck wave mode and slow-wave mode benefit the gain and realize better directivity. The maximum gain could improve as high as 5 dBi. Several measured results are successfully confirmed with simulations, which demonstrate the higher directivity in the endfire direction. This design method provides a new method to improve the radiation characteristics for Vivaldi antenna.

中文翻译：

---

使用欺骗表面等离子体激元增强维瓦尔第天线的辐射特性


传统的 Vivaldi 天线以其超宽带宽而闻名，但增益较低。为了增强辐射特性，我们提出了一种新方法，通过添加支持欺骗表面等离子体激元（SSPP）作为寄生元件的附加结构。所提出的贴片在整个频带上具有增强的增益，而不会降低带宽。 Sommerfeld-Zenneck波模式和慢波模式有利于增益并实现更好的方向性。最大增益可提高高达 5 dBi。一些测量结果已成功通过模拟得到证实，这表明端射方向具有更高的方向性。该设计方法为改善Vivaldi天线的辐射特性提供了一种新的方法。