This letter proposes an end-fire Vivaldi antenna based on spoof surface plasmon polaritons (SPPs). SPP is generated by a periodic corrugated metal–insulator–metal (CMIM) waveguide on which the odd mode of the SPP is propagated and is rarely used in the design of antenna transmission lines. Gradient corrugations and slotlines form the transitional part to achieve momentum matching and impedance matching between the microstrip feed line and plasma waveguide. In addition, one parasitic patch is introduced in flare aperture to improve the performance of the radiation. Both the simulation and measured results are carried out and match well with the theoretical design. This antenna generates end-fire radiation beams within 4-9 GHz frequency range (S₁₁ < –10 dB). Measured results show that the realized gain is higher than 8.87 dB and the 3 dB beam width is stable between 31 and 36° over the operation frequency.

中文翻译：

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基于欺骗表面等离子体激元的端射 Vivaldi 天线

这封信提出了一种基于欺骗表面等离子体激元 (SPP) 的端射 Vivaldi 天线。SPP 由周期性波纹金属-绝缘体-金属 (CMIM) 波导生成，SPP 的奇模在该波导上传播，很少用于天线传输线的设计。梯度波纹和槽线形成过渡部分，以实现微带馈线和等离子体波导之间的动量匹配和阻抗匹配。此外，在耀斑孔径中引入了一个寄生贴片以提高辐射性能。仿真和实测结果均与理论设计相符。该天线在 4-9 GHz 频率范围内产生端射辐射波束 (S ₁₁ < –10 分贝）。测量结果表明，实现的增益高于 8.87 dB，并且 3 dB 波束宽度在整个工作频率范围内稳定在 31 到 36° 之间。