Recently, spoof surface plasmon polaritons (SPPs) have been successfully applied to microwave signal propagation in ultra-thin planar circuits, due to their unique features of electromagnetic (EM) wave confinement in deep subwavelength scale and controllable dispersive properties. Both even and odd modes can be supported in symmetric spoof SPP structures. However, most device applications employ even mode propagation due to its easy stimulation. In this paper we investigate the dispersion characteristics and EM field patterns of both even and odd modes in a symmetric H-shaped spoof SPP structure. We concentrate on odd modes with an anti-symmetric electric field distribution, and their application to the propagation and filtering of differential signals. With odd modes, a balanced bandpass filter (BPF) can be constructed with a designable passband depending on the dispersion engineering of the odd modes in the spoof SPP structures. Pure odd mode propagation provides an ideal plat...

中文翻译：

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通过奇模欺骗表面等离子体激元极化传播过滤微波差分信号

近年来，由于其在深亚波长范围内电磁（EM）波限制和可控制的色散特性的独特特征，欺骗性表面等离子体激元极化子（SPPs）已成功应用于超薄平面电路中的微波信号传播。对称欺骗SPP结构可同时支持偶数和奇数模式。但是，大多数设备应用由于其容易刺激而采用了均匀模式传播。在本文中，我们研究了对称H形欺骗性SPP结构中偶数和奇数模的色散特性和EM场模式。我们专注于具有反对称电场分布的奇数模及其在差分信号的传播和滤波中的应用。在奇数模式下 可以根据欺骗性SPP结构中奇数模的色散工程，使用可设计的通带构造一个平衡带通滤波器（BPF）。纯奇数模式传播提供了理想的平台。