Zephyron
Newbie level 2
Hi HFSS users,
I am using HFSS to simulate WR-90 hollow waveguide (a=2.286cm,b=1.016cm). For the first five modes, we know theoretically the waveguide characteristic impedance (defined by Ex/Hy) is like the attached plot. It should converge to free space impedance (377 ohm). But when I plot PortZ0 in HFSS, the values of all the modes are very different from the theoretical values, some go to above 1000 ohm, some go to below 10 ohm.
I know it may because HFSS use Zpi to calculate the port impedance. I tried to define different integration lines for the five modes and use Zpv or Zvi to calculate port impedance. It seems not working, still gives crazy values. Or there are other methods to fix this problem, like renormalize port impedance? Thanks for any information!
I am using HFSS to simulate WR-90 hollow waveguide (a=2.286cm,b=1.016cm). For the first five modes, we know theoretically the waveguide characteristic impedance (defined by Ex/Hy) is like the attached plot. It should converge to free space impedance (377 ohm). But when I plot PortZ0 in HFSS, the values of all the modes are very different from the theoretical values, some go to above 1000 ohm, some go to below 10 ohm.
I know it may because HFSS use Zpi to calculate the port impedance. I tried to define different integration lines for the five modes and use Zpv or Zvi to calculate port impedance. It seems not working, still gives crazy values. Or there are other methods to fix this problem, like renormalize port impedance? Thanks for any information!