Spoof surface plasmonic transmission line with high isolation and low propagation loss

Singh Surya Prakash; Tiwari Nilesh Kumar; Akhtar M. Jaleel

摘要

A novel compact spoof surface plasmonic (SSP) transmission line (TL) consisting of a stem-shaped periodic structure is proposed to achieve high field confinement in the higher frequency range (microwave to terahertz). The dispersion characteristic of the proposed stem-shaped SSP unit cell exhibits much lower asymptotic frequency and higher field confinement than the conventional coplanar waveguide (CPW) and the rectangular SSP unit cell structure without increasing the overall transverse dimension, i.e., improved signal propagation performance with reduced cross-sectional area. The numerical study of the multi-conductor line based on the proposed stem-shaped SSP unit cell shows that it has improved propagation and isolation features in comparison to the conventional TL structures. Here, the improved isolation is characterized in terms of the mutual coupling (MC) between the two adjacent lines designed using the stem-shaped SSP unit cell, which is not found to significantly increase with an increase in the coupling length unlikely in the conventional TLs. For the proposed SSP-based multi-conductor line, the MCs for 1.6, 2.25, and 4.15 lambda coupling lengths with fixed separation of 0.175 lambda are found to be 22, -19.8, and -17.55 dB, respectively. (C) 2020 Optical Society of America

机译：提出了一种由茎形周期性结构组成的新型紧凑型墓地表面等离子体（SSP）传输线（TL），以在较高频率范围内实现高场限制（微波至太赫兹）。所提出的茎形SSP单元单元的分散特性表现出比传统的共面波导（CPW）和矩形SSP单元电池结构更低的渐近频率和更高的场限制，而不增加整体横向尺寸，即改进的信号传播性能减少横截面积。基于所提出的茎形SSP单元单元的多导线的数值研究表明，与传统的TL结构相比，它具有改善的传播和隔离特征。这里，改进的隔离的特征在于使用茎形SSP单元电池设计的两个相邻线之间的相互耦合（MC），这在不可能在传统TL中的耦合长度的增加下没有发现显着增加。对于所提出的基于SSP的多导体线，发现具有0.175λ的固定分离的1.6,2.25和4.15λ耦合长度的MCS分别为22，-19.8和-17.55 dB。（c）2020美国光学学会

Spoof surface plasmonic transmission line with high isolation and low propagation loss

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