chip RFID sensitivity (-18 dBm) +HFSS

Hello
how to enter the value -18 dbm chip(NXP) Sensitivity in the software HFSS
chip=22+195j
f=915Mhz

Hi,

I have the chip impedance at 915 MHz nxp chip: 24-j222 and anthor impedance in external supply mode 8-j228, what I should use while designing the RFID tag. How to simulate this port impedance either in CST MWS or HFSS?. Thanks for your help

What do u mean by "external supply mode"? Is it a semi-passive tag chip? Use the impedance of the right operation mode.