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Port settings for GSGSG transmission line simulation

Question asked by yanyujin on May 26, 2010
Hi,

For CPWs (i.e., GSG) simulation in Momentum, single port is probably assigned to the signal line (S) and ground reference port for the side ground planes (G). For GSGSG transmission lines simulation, since the center ground line (P7-P8) is shared by both signal lines, the ground reference port, e.g., P7, has to be referred to either P1 or P3. In this way, the symmetry between two signal lines are destroyed, and the simulation results are not desirable.

P6    P2    P8     P4   P10
G     S      G      S     G
|      |      |      |     |
|      |      |      |     |
|      |      |      |     |
G     S      G      S     G
P5    P1    P7     P3   P9

To get around the problem, I have to assign all ports as single port, and ground the ground planes later in the schematic simulation. Any comments on this? Or how you simulate GSGSG-type transmission lines in Momentum? Thanks.  

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