fringing fields waveguide port for quasi tem microstrip simulation

[RoCKo23678]

Hello , In CST when I simulate microstrip line i need an excitation that covers the fringing fields of the microstrip.
what is the most suitable excitable in such situation for open ems?

[VolkerMuehlhaus]

For many microstrip situations, the microstrip port is the way to go. This allows to place the measurement plane (voltage and current probe) at some distance from the excitation and port resistor, so that fringing fields decay and we have "clean" field distribution in the measurement plane.

https://openems.readthedocs.io/en/latest/concepts/ports.html#transmission-line-ports

Microstrip ports can be located inside the simulation domain if you specify a termination resistor, or they can start/end at the outer boundary running into a PML wall (no reistor in that case).

One example for using microstrip ports is here:
https://openems.readthedocs.io/en/latest/python/openEMS/Tutorials/MSL_NotchFilter.html
This one uses PML boundaries instead of the lumped resistor at the port.

When you try the example, don't forget to change line 95 to

### Run the simulation
if 1:  # debugging only

to get the model/mesh preview window as shown below.