a Lossy Silicon Substrate Property Setting in HFSS for CMOS Technology

[vivianying]

Hi, I am now designing an On-chip antenna in HFSS. The resistivity of silicon in CMOS is 10Ωcm. The material edit window in HFSS doesn't give the resistivity define section. The only thing I changed was the conductivity (10simens/m). However, within this setting, my result shows that the silicon substrate dosent have such high energy loss as the normal articles saying..

Does any one could help me to give some advice about setting the lossy silicon substrate in HFSS?
Many Thanks! :shock:

 

[echostar]

I had a similar experience. Waiting for some help here.