Homework Help: Near end coupling coeffecient problems

1. Mar 25, 2013

Trespaser5

I have been given a formula Kne = $\frac{1}{4Td}$(CZo+$\frac{L}{Zo}$)
I've been given C as 10pF and L as 80nH and Zo as 70.7.
I have calculated Td from the formula propogation velocity = 1/$\sqrt{LC}$ and the line capacitance and inductance are 400nH and 80pF and then divided this into 0.05m the line length is given as 50mm.

The problem is I get a coeffcient of 1.64, this can't be correct as it would mean the interference voltage would be greater than the voltage being driven in the aggressor

Anyone see where I'm going wrong ?

2. Mar 25, 2013

rude man

How about you state the problem in full. Some kind of transmission line thing?