Could some electronics guru please clarify the following ? I am working on some SPICE simulations of signal propagation down coupled parallel microstrips.Microstrips are modelled as lossy transmission lines.
As we know there are two propagation modes.
- Even - signals in the same direction. No problems at all.
- Odd - signals propagate in opposite directions. My questions are with regard to how to correctly model this case in SPICE, specifically, applying the signals. First,for two coupled parallel microstrips, there are two input ports(1, 2) and two output ports(3, 4). Q1: To model the odd mode, is one input applied to one input(port 1), but the second input applied to port 4, to ensure signals travelin opposite directions ? Q2 Is the signal applied to port 3 in phase with that applied to port 1 ?
Is there an alternative way to model thi?
Any hints/suggestions would be of immense help. Thanks in advance.