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HFSS complex impedance port setting

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shanmei

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I don't know how to set the port impedance to be complex value for simulation of RFID tag antenna?

I want to use RFID chip which has the impedance of 12-j140. For the conjugate matching, I need to set the port impedance 12+j140.

However, the port impedance setting of HFSS only allows me to choose 50 ohms, not the complex value of 12+j140.

From the HFSS-Excitations-Assign_lumped port, I can only choose 50 ohms. How can I choose 12+j140? Thanks.
 

HFSS will compute the frequency response of the structure with 50 Ohm Zo first then if you wish, it will compute in according with your terminal impedance.
hfss.PNG
 
Go to HFSS/design settings/S parameter definition - choose "power".
You can also specify complex impedance defining the impedance as: 12 +1i*140. this should work (from 18.1 I think)
 

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