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article influence of via stub length and antipad size on the insertion loss profile continues Figure 15: Averages for single ended return loss. Figure 16: Alignment insertion loss and return loss. Figure 17: ANOVA chart for resonance frequency. rameters' stub length and antipad size on the resonance frequency (Figure 17). The main effect plot demonstrates, that larger antipad sizes increase resonance frequen- cy slightly. The main driver however is the stub length, with the short stub length SE04 resulting in a resonance at close to 40 GHz, whereas the longest stub (SE10) creates a resonance only January 2014 • The PCB Design Magazine 53