Hello,
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.
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.
did you try to have a look at this example?
https://edasupportweb.soco.agilent.com/ ... ref=search
Some time ago I found a very good presentation on coupled lines simulations and calculation of various Z0's entitled "Various Approaches to Differential- and Common-mode Transmission Line Design and extending the Multilayer Interconnect Library
Using Agilent EEsof Advanced Design System". If you cannot find it I can maybe send it to you.
Also, if you look in the KC and search for "differential impedance" and/or "multilayer" you can find something useful.
Hope this help
Francesco