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About differential impedence of coupled line

Question asked by zqtong on Dec 14, 2006
Latest reply on Dec 18, 2006 by mfredrik
I am simulating one pair of coupled lines and want to get 100 Ohm differential impedence @1GHz. I build two lines with 3mm width and 4mm spacing each other. The substrate is Fr4 which has dielectric constant 4.3 and 1.6mm thickness. I put four ports(50 Ohm) on each side of the lines and defined them as differential port seperately. I am confused of which parameter indicate the differential impedence of coupled line. I found real(Z0_1_) is 98.97 within the frequency range. Is that the differential impedence of the coupled line? Any suggestions are welcome.
I am just a new one here. It is quite possilbe sb. else discussed the similar quesion in the forum. If so, could you give the link of previous discussion. Thanks in advance.