CPW layer definition ADS for antenna

Hi ,
I am designing a CPW fed antenna and I would like to know what is the proper way of defining the layers.

If the substrate layers are:
Freespace (open)
Dielectric (open)

I get good results ( I don't knwo yet f they match measurements)

If the substrate layers are:
Freespace(open)
Dielectric (closed)
Freespace (open)
Then I don't get resonance.

What is the right way of defining the substrate layer?

Thanks

hi the attach file about antenna design with ADS

Hi Icpinu,

I guess that you use a grounded CPW structure. If you didn't change anything on the backside metalization of Dielectric, by applying an open boundary (Freespace) under Dielectric then you loose your ground-plane. This is just a guess as I don't know your structure.
If this is the case, you have to draw your limited ground-plane at the back of your Dielectric.

Hope it helped,

JB

Hi thanks for your rplies. Ferdows i couldnt see any attached file.
Best

hi icpinu
i cant understand i could download the attached file
whats u mean?

I don't know that happend to my other computer, I was able to dowonload it now.

Many thanks,

Share your ADS design, atlease screenshots.

The attachment sent by ferdows is using micro strip design and will not help you.

Hi ferdows,
Can you please share the file which you have attached, I cant download it, it's grayed out for some reason.

thanks