Problem with S parameter in planar antenna design done in HFSS 9.2

[pbuarque]

Hi,

I'm starting to use HFSS so I must be doing something wrong. As you may see in my file I am trying to get a planar antenna to work. However, S parameter is (in absolute value) too low, I was expecting something greater than -20dB. Please help me. The hfss extention has been changed to hfs

Thanks

Pedro

 

[nael_ee]

Re: HFSS 9.2 S Parameter

Dear Pedro,
what is your design frequency of the patch antenna. what is your reference of the design there is a resonance at about 4 GHz.

there are notes about the setting like the Rad is not lambda/4 distance from the antenna surface, and the ground slug is not an infinite. but non of these provide a reason why your is off.

note the substrate is so small in thickness why??