I am simulating a microstrip circuit for a PA where layout is very tight, and I must capture coupling between lines for accurate load matching.

When microstrip lines couple, each line's impedance is impacted by the electric fields of the other nearby line. These fields get larger as the power/voltage on the line is larger. So, it seems a safe assumption that coupling between lines should change with the amount of voltage on that line.

Does momentum have an option to change the incident power on a line for the EM? I realize I can do this via post-processing, but that is after the EM solution is already solved. I am concerned that if my lines have too much or too little voltage, I cannot accurately simulate the coupling.

Thanks

When microstrip lines couple, each line's impedance is impacted by the electric fields of the other nearby line. These fields get larger as the power/voltage on the line is larger. So, it seems a safe assumption that coupling between lines should change with the amount of voltage on that line.

Does momentum have an option to change the incident power on a line for the EM? I realize I can do this via post-processing, but that is after the EM solution is already solved. I am concerned that if my lines have too much or too little voltage, I cannot accurately simulate the coupling.

Thanks

The coupling may change the line impedance, and hence the amplifier termination impendance and its stability, but the change in microstrip line impedance due to coupling is linear.