I used HFSS to simulate CPW, and I want to know the characteristic impedance.I used the wave port and lumped port , have set the proper size, to excite the CPW. And I got the port z0 50 or 75 ohm, that's not the real impedance. How can I get the real CPW's characteristic impedance through HFSS,I really need help!
Port characteristic impedance is strongly depend on Port size definition. You got a wrong result, maybe you made a wrong definition of CPW port (waveport) in HFSS.
Read the port tutorial carefully and try it again. I think you'll get a real characteristic impedance that you're expecting
cheers!