Help me simulate a Pifa RFID in CST MWS

Hello everyone.
I'm trying to simulate a pifa RFID from a paper but i'm having problems while trying to feed. I don't think i can post the paper up here so i'll try to describe it as best as possible.

It is a tag antenna that uses 2 pifa radiators which are fed inductively by a loop connected to the microchip to backscatter the information back to the reader.

In CST MWS, i used a discrete port to feed the loop,to in effect act as the microchip but when defining the impedance of the port i can't use a complex value which is a problem because the impedance of the microchip is 10 - j150 ohms.
I thought about just using the resistive part for the simulation but i think this would be wrong since impedance matching takes into account the figuration of the structure.

I also can't get the same current distribution that is shown in the paper. When i animate the current it seems like it is only inducing current in the ground plane but not in the 2 radiators.

The orginal design was simulated using HFSS if that helps.
I'm new to CST so any help will be appreciated and i've also attached my file below.

申明：网友回复良莠不齐，仅供参考。如需专业解答，请学习易迪拓培训专家讲授的CST视频培训教程。