Enhancing Signal Integrity at Bend Discontinuities in High-speed Differential Lines Based on Dispersion Characteristics of CRLH-TL

A novel technique is explored to improve signal integrity in high-speed differential transmission lines by incorporating a Composite Right/Left-Handed Transmission Line (CRLH-TL) structure. This method aims to mitigate common-mode noise and signal integrity degradation caused by asymmetric bends in differential transmission lines. The primary source of common-mode noise in differential signaling is the phase difference due to length disparities between the inner and outer lines at bend discontinuities. By employing Double Negative (DNG) metamaterial exhibiting a reduced propagation constant, the phase difference can be effectively compensated. The proposed CRLH-TL compensation structure's effectiveness is validated through both frequency and time-domain simulations, demonstrating its proficiency to suppress common-mode noise across a broad frequency band.