Time domain analysis of a wideband common-mode suppression filter for bent interconnects

A technique to efficiently reduce differential-to-common mode conversion occuring at a bend discontinuity in coupled microstrip lines is investigated. Total signal integrity in the interconnect structure has been improved by minimizing the differential reflection coefficient and insertion loss simultaneously. This is achieved by changing the geometry of the microstrip lines via a tapering section to tightly or very tightly coupled ones in the area of the bend. The new design was manufactured, measured, and validated by means of time-domain analysis, providing very satisfactory results.