GiantMoMo
Newbie level 1
Hi,
I am a newbie to CST and I am not sure what I am doing wrong here.
I am trying to simulate a printed inverted-F antenna on a FR-4 PCB. The bottom side of the PCB is a solid ground plane except for where the antenna is. The antenna is fed using a coax with a waveguide port. I have also drawn some ground patches on the top side and have them stitched up using vias.
The structure simulates fine under default settings with a relatively large mesh line ratio limit.
For some reason, I don't seem to be able to increase the mesh density. Whenever I tried to increase lines/wavelength or increase refinement along edges or volume for any objects, the simulation either becomes unstable or all the energy are reflected back at the port (shorted). I can't use adaptive mesh generation as well because again the energy gets reflected back on the second pass.
Now I am not sure if I simulated the first pass properly.
I am a newbie to CST and I am not sure what I am doing wrong here.
I am trying to simulate a printed inverted-F antenna on a FR-4 PCB. The bottom side of the PCB is a solid ground plane except for where the antenna is. The antenna is fed using a coax with a waveguide port. I have also drawn some ground patches on the top side and have them stitched up using vias.
The structure simulates fine under default settings with a relatively large mesh line ratio limit.
For some reason, I don't seem to be able to increase the mesh density. Whenever I tried to increase lines/wavelength or increase refinement along edges or volume for any objects, the simulation either becomes unstable or all the energy are reflected back at the port (shorted). I can't use adaptive mesh generation as well because again the energy gets reflected back on the second pass.
Now I am not sure if I simulated the first pass properly.