Interlaced Spoof Surface Plasmon Polariton for Improvement of Transmission Line Signal Integrity

Crosstalk between adjacent transmission lines (TLs) is among the factors that strongly affect the signal routing integrity of printed circuit boards and integrated circuit packages. In contrast to traditional methods of suppressing crosstalk on high-density TL layouts, including guard traces or stubs, spoof surface plasmon polariton (SPP) can help design smaller structures for crosstalk suppression. Accordingly, this study proposes an interlaced SPP for reducing impedance discontinuities on double-sided SPP TLs. The experimental results indicated greater signal integrity in the interlaced SPP, with an eye-height improvement of 6.4 % at a data rate of 16 Gbps.