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My goal is to simulate a single-ended line, but with a "realistic" ground instead of "ideal" ground. A first approximation I make is to say that ground path has the same characteristic than the line itself. That's why I would like to have only one "ideal" ground net at the left side and no ground net at the right side.

The problem I encounter is that LTspice doesn't really allow to do that, I don't know why and it's kind of frustrating.

However, the only solution for this problem seems to be this : [MEDIA=youtube]v-F3WQvQf9E:810[/MEDIA]

The guy in the video uses big resistances (100Meg) just to make LTspice quiet while trying to simule a kind of "realistic" ground path.