Excitation type for a planarized monopole in HFSS?(updated)

Hello, I need to excitate a monopole in HFSS. The problem is that is a planarized monopole and I don't know if using a Lumped Port will work. In case it works I don't know either were to place it and if it has to touch or not the monopole metalized print.

Can anyone give me a little advice :)

Thanks.

Would you please upload your .hfss file!

You can set the lumped port as you have done for waveport. I've changed your waveport to lumped port. Please take a look.

Thank you, i have already tried this solution. But I think it has a problem. It simulates well and all but it doesn't take into account one of the ground surfaces (the one in the left). That's why i used the waveport. I have found a tutorial where it explains a little bit how to solve this problem. Anyway it is not easy to simulate with precision this kind of planar antennas. I think that i am going to create a 50 ohm coaxial and then plug it to the structure. And place the lumped port in the coaxial. Maybe this way i can obtain the good results.

Thank you for your time and to have a look to my post. . :D

You are not right about this statement. If you take a look at "port field display" you can see the CPW field.

Ok I see. I was wrong. Thanks a lot. I am going to resimulate this example and try to find the dimensions for an acceptable UWB behaviour. I am quite new in HFSS. :D

Hi pintado,
since all your model is inside the airbox including the excitation, have your tried a lumped port excitatiion?
This should help you to also find out the right waveport size.

I explain better.....it seems that the port size is too small since the arrow in the port display are just a couple of orders smaller in amplitude compared to the field displayed around the trace.

If your widen up a bit the port size you should get some blu arrow next the port borders....this means that the waveport (PEC) borders are not affecting the structure' s feed...

Try and see if you get a better result.

Then compare the result with the ones got from the lumped port excitation......you should be able to get quite the same behaviour.

regards