Hello Dan, thanks a lot for the hint, I was completly on the wrong path... Now everthing is clear, for anybody interessed, as an example, I attached my results. Regards, Marcel geda-user-bounces@xxxxxxxxxxxxxx schrieb am 10.03.2009 12:31:07: > What you want is to use the coupled microstrip calculator and ask for 55 > Ohms for the even mode impedance and 50 for odd mode. At least this is > I think what you are asking. > > Even mode impedance is the impedance of one of the lines when the other > line is driven by an identical source. Odd mode impedance is the > impedance of one of the lines when the other lines is driven by an out > of phase source. > > So certainly you want 50 Ohms for Z0o (odd mode impedance) since that > produces a 100 Ohm differential impedance. The question is what you > really mean by "single impedance" since the lines are coupled. > > In general though if you are designing a coupled line, you should only > use the coupled line calculator. > > Hope this helps a little. > > -Dan . Der Inhalt dieser E-Mail ist für den Absender rechtlich nicht verbindlich. Informieren Sie uns bitte, wenn Sie diese E-Mail fälschlicherweise erhalten haben (Fax: +49-7551-891-4001). Bitte löschen Sie in diesem Fall die Nachricht. Jede Form der weiteren Benutzung ist untersagt. . The content of this e-mail is not legally binding upon the sender. If this e-mail was transmitted to you by error, then please inform us accordingly (Fax: +49-7551-891-4001). In such case you are requested to erase the message. Any use of such e-mail message is strictly prohibited.
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