The present disclosure relates to ultra-high speed digital signal integrity improving structures. Each structure in the present disclosure includes a first unit structure and a second unit structure of the same or different shapes arranged to face each other on the left and right sides along a longitudinal direction of a balanced line, centered around a coplanar stripline (CPS) or parallel stripline (PSL) formed on a substrate. At least one of the first unit structure and the second unit structure includes a first side close to the balanced line and having a linear or curve shape; a second side facing the first side; and left and right sides connecting the first side and the second side. Here, the width of the first side is less than or equal to that of the second side, the left and right sides have a linear or non-linear slope, and the width from the first side to the second side is configured to change continuously or discontinuously. When the structures of the present disclosure are disposed around a balanced line, it has the advantage of being able to recover the distorted phase autonomously while rejecting a common-mode signal in a frequency band up to 40 GHz or more.