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Positive values of dB(S21) with single ports

Question asked by riaz_sobrany on Jul 8, 2004
Latest reply on Aug 26, 2004 by riaz_sobrany
When I simulate certain transmission lines using single ports I end up with positive values for dB(S21) when in reality they should be negative values. Usually dB(S21) has a value around 0.2 but sometimes it reaches as high as 5. Why is this the case?  

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