Differential microstrip lines with reduced crosstalk and common mode effect based on spoof surface plasmon polaritons.
We apply the concept of spoof surface plasmon polaritons (SPPs) to the design of differential microstrip lines by introducing periodic subwavelength corrugations on their edges. The dispersion relation and field distribution of those lines are analyzed numerically. And then through designing practical coupling circuits, we found that compared with conventional differential microstrip lines, the electromagnetic field can be strongly confined inside the grooves of the corrugated microstrip lines, so the crosstalk between the differential pair and the adjacent microstrip lines is greatly reduced, and the conversion from the differential signal to the common mode signal can also be effectively suppressed. The propagation length of those lines is also very long in a wide band. Moreover, the experimental results in time domain demonstrate those lines perform very well in high-speed circuit. Therefore, those novel kinds of spoof SPPs based differential microstrip lines can be widely utilized in high-density microwave circuits and guarantee signal integrity in high-speed systems.
Jin Jei
JJ
Wu
Da Jun
da J
Hou
Kexin
K
Liu
Linfang
L
Shen
Chi An
CA
Tsai
Chien Jang
CJ
Wu
Dichi
D
Tsai
Tzong-Jer
TJ
Yang