Investigation of Characteristic Impedance of Installations with Twisted Pairs

In this work, we investigate the characteristic impedance measurements of installations as different cable types above a ground plane for differential and common mode modes. There are multiple ways of measuring the characteristic impedance, yet using open and short terminations to calculate the characteristic impedance is an extensively used method. However, the applicability of this method for different modes in a broad frequency range, the effect of the ground plane and vertical reference plane (VRP), together with the repeatability of the measurements need to be further clarified. Thus, we use thin wire and twisted pairs to address these points and propose a new perspective on characteristic impedance measurements.