Optimization of Spoof Surface Plasmonic Waveguide for Crosstalk Reduction

• Main Authors: Shuo Chang, 張碩
• Other Authors: Ding-Wei Huang
• Format: Others
• Language: zh-TW
• Published: 2018
• Online Access: http://ndltd.ncl.edu.tw/handle/br7b9n

碩士 === 國立臺灣大學 === 光電工程學研究所 === 106 === Nowadays, the digital data rate of a single electrical signal transmission line on the printed circuit board (PCB) is as high as hundreds of Mb/s and even several Gb/s. To achieve hundreds of Gb/s or up to Tb/s in total, the density of transmission lines on the PCB is very high, which means we can no longer ignore the crosstalk between adjacent transmission lines. Some researchers proposed to apply the properties of surface plasmon polaritons (SPP), the highly concentrated field distribution, on crosstalk reduction. With specially designed subwavelength periodic structures, metal waveguides can behave like SPP in microwave frequencies, which are called spoof surface plasmon polariton (SSPP) waveguides. Studies focusing on crosstalk-reduction waveguides based on SSPP waveguides have been published these years. However, they merely compared different kinds of SSPP structures with microstrip lines, but there is no further discussion and optimization. In this research, we first calculate the coupling coefficient of two adjacent SSPP waveguides and optimize the design parameters by even-odd modes analysis. Compared to published papers, the crosstalk has been reduced by 35.34 dB at frequency of 4.5 GHz, and reduced by 33.13 dB at 10 GHz, more than three orders of magnitude, while its 3-dB bandwidth for transmission is 25.7 GHz. At last, the fabrication tolerance is analyzed to predict the effect of manufacture error on the performance of this waveguide. It shows that when the error is ±0.2 mm, the crosstalk is still below -30 dB from 0 to 10 GHz, particularly below -40 dB at 4.5 GHz, and -35 dB at 10 GHz. In conclusion, the SSPP waveguides optimized in this research performs significantly well on crosstalk reduction, and they are of great value for applications. Hope to see such waveguides to be applied on high-speed digital systems universally.