Hello! I am trying to simulate a quarter-wave resonator in HFSS and I have the geometry in the picture below. The design is resonant at the frequency I need (around 115 MHz). For my problem at hand, I want the magnetic field in the gap at the top (between the inner cylinder and the outer shell) to be as small as possible, for a fixed electric field (around 1kV/cm in my case). In the ideal case (i.e. in the simulation), that should be very close to zero. While the overall shape of the magnetic field is what I would expect (see first picture below in log space), when I zoom in that region, the magnitude of the magnetic field is much bigger than what I would expect and also the shape looks weird. The blue region at the center (see second picture), which should be the smallest field (which I am interested in), has this diffuse shape, instead of keeping the cylindrical symmetry of the system. Why is this happening? And what is the best way to reliably extract the magnetic field in that region? Also, what parameters should I use for the simulation to make sure I don't run into any resolution issues? Thank you!
