Help me set up a simple interconnects structure in Q3D

I want to use Q3D to simulate a simple interconnects structure, a signal line with three ground line on each side, as illustrated below.

G1 G2 G3 S G4 G5 G6

All the ground lines are the return path of the signal line, which means the sum of the return currents in the ground lines is equal to the current in the signal line.
How can I set up this structure in Q3D?

I think I?ve solved the problem. Firstly, I grouped all ground lines by ?Join in parallel?, which would connect all the sources and sinks of the ground lines separately by perfect wire and make them have the same potential. Secondly, I connected the sink of a signal line and the source of the ground net, formed in the first step, together by using ?join in series?. Then, the structure may be correctly set up.

Hi,

I have a similar question and hope you can help me.
I want to extract RLGC parasitics for 4 signal lines arranged as 2x2 matrix say
s1 s2
s3 s4

This is what I have done:

1. Identify these 4 signals are nets.
2. For each of these nets (signal wires/conductors), assign source to one end of the conductor and a sink to the other end.
3. These 4 conductors are embedded in a silicon substrate (box embedding these conductors) under which a copper ground plane (box made of copper) is drawn.

Since Q3D assumes all the conductors other than those that are defined as nets, I am assuming this structure is a good enough for extracting RLGC parasitics for a 2x2 array of signal wires.

Please let me know your comments.