PIFA coaxial Feeding

Hello every body,
I'm student, i have to do a PIFA antenna with coxiale Feeding.
I have designed the antenna but i can't assign the materiel of the :
Shorting PIN = Copper
Ground = Copper
and the material of the two cylindres of the coaxiale Cable.
Can any one help me to configure the antenna using HFSS.
The PIFA antenna operate with the frequency 2GHz for 3G applications.

pifaaa coaxial.rar

Any one knows this type of errors

Material properties cannot be assigned to sheet objects. Materials can be assigned only to Solid objects