[SI-LIST] Differential line Via - affecting common mode noise

Hi Experts,
                How the via improve or degrade the differential lines common 
mode noise and performance as I am getting more common mode noise for a case 
where I don't have any via. If I include a transition via (modeled in HFSS - 
s4p model) the common mode noise is getting reduced. Please direct me to a good 
article/paper/book to understand the theory behind this.

Thanks & Regards
Lakshminarayanan. S


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