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characteristic impedance

Question asked by bachelorgg on Apr 4, 2011
Latest reply on May 19, 2011 by EugeneTDA
Hi, I measured s-parameter and extract the characteristic impedance, it seems that characteristic impedance is high at low frequency and becomes stable at about 1GHz. The same thing happens on the effective dielectric constant. Is this normal? Please help me. Thank you.  

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