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78 I-CONNECT007 MAGAZINE I AUGUST 2026 ance when a trace runs below the opening in the GND plane. The TDR is optimized to the loss parameters, S21 and S11, insertion, and return loss can also be calculated for near-end and far-end crosstalk (NeXT and FeXT). In Figure 6, the insertion loss plot of the optimized 2.4mm deep structure R-VeCS. The loss is reduced between the 20 and 50Ghz mark after adding capacitive elements to the half-via. The response became smoother as well. We also see that the cut-off frequency becomes evident around 60 GHz. SI Performance of R-VeCS The application area for R-VeCS is shown up to 60Ghz. This is defined by the inductive and capaci- tive values of the construction. It can be optimized Figures 5 and 6: Optimization of the TDR response of the R-VeCS using side wings and measurement of insertion and return loss.