Hi Sabah

S parameters are not defined when a plane wave excitation is used. You may think of exciting your system with an antenna placed far away, so that it's got a port attached to it. The price to pay is that your simulation volume might be too large.

Another tricky solution would be monitor the incident and reflected waves in a probe (which will give an idea of the return loss, related to the S parameter).

good luck

Hi Marcelo,

Thanks for your response. but i don't know how can i define the incident and reflected waves in the Field Probe. Can you please tell me what should i do?

Hi

I had the same problem but I used the way said here:

https://electricalengtutorial.blogspot.com