I have designed multiband microstrip patch antenna with inset feed (for LTE) and I have used finite ground plane. When I am doing momentum microwave solution I am getting very poor gain and radiation efficiency. But when FEM simulation is done then results obtained are good. Can anyone please tell me the reason for this difference between FEM and momentum microwave. Also tell me which solution is better to use for my design? Thank you
Hello,
it is always difficult to answer "I modeled something and get unexpected results" questions without knowing anything about your model, and your experience with both EM tools.
In most cases, I get very similar results for planar antenna simulation with Momentum and FEM, including antenna efficiency. In some cases, there is a small shift in frequency due to the finite substrate vs. infinite substrate size, but otherwise both results are fine.
Large effect from finite substrate would be expected if your antenna radiates in the substrate plane, e.g. Vivaldi antenna.
So it sounds like something is wrong with your model, and the problem is not Momentum vs. FEM.
Have you double checked your ports in Momentum, to make sure and terminals are used correctly for this finite ground situation?
Best regards
Volker