Recently, Plasmonics and metamaterials have been receiving consideration. Spoof surface plasmon polaritons (SSPPs) are a type of electromagnetic surface wave that to a certain limit shares an analogous behavior with surface plasmon polariton (SPP) at microwave frequency domain. The significant point is that the dispersion relation of SSPP is principally controlled by the geometry of the pattern using plasmonic metamaterial. The motivation behind this work is to explore and implement the subwavelength propagation or nanoconfinement of wave beyond the diffraction limit using plasmonic metamaterial‐inspired SSPP structure in the microwave frequency domain. In this article, the conventional symmetric H‐shaped unit cell is modified into a new unit cell. Using this modified unit cell, a new SSPP structure is designed which provides broadband bandpass filter (BPF) characteristics. The measurement shows the passband of BPF is 1.2 to 6.0 GHz with insertion loss less than 2 dB. The size of the fabricated SSPP BPF is 26 × 4 cm.

中文翻译：

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基于欺骗性表面等离子体激元极化子的微波带通滤波器

近来，等离子和超材料已经受到考虑。欺骗性表面等离子体激元极化子（SSPP）是一种电磁表面波，在一定的频率范围内与表面等离子体激元极化子（SPP）在微波频域具有相似的行为。重要的是，SSPP的色散关系主要由使用等离子超材料的图案的几何形状控制。这项工作的动机是在微波频域中使用等离子超材料激发的SSPP结构，探索并实现超出衍射极限的波的亚波长传播或纳米约束。在本文中，将传统的对称H形晶胞修改为新的晶胞。使用修改后的单位单元格，设计了一种新的SSPP结构，该结构具有宽带带通滤波器（BPF）的特性。测量显示BPF的通带为1.2至6.0 GHz，插入损耗小于2 dB。制成的SSPP BPF的尺寸为26×4 cm。