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article influence of via stub length and antipad size on the insertion loss profile continues Table 1: Impedance results. Figure 9: Single-ended insertion loss test setup. Full 2-port and 4-port S-parameters were measured on all test boards. The data was transferred into a spreadsheet and statistics software to allow plotting of the parameters and further 50 The PCB Design Magazine • January 2014 evaluations, like the analysis-of-variance (ANOVA) to find the 'vital few' parameters. The setup for single-ended insertion loss testing can be found in Figure 9.