[moved] Split ring resonator based RFID antenna design in CST ?

Hi,
I want some information about RFID antenna design in CST. I am a new in this field (RFID's Antenna), therefore need your help. I am trying to simulate a RFID antenna in CST but results does not match with the original. I am little bit confused about exciting discrete port in CST for RFID chip. it means its impedance is not same as chip. As it is required that antenna and chip impedance must match by using conjugating technique. Kindly,suggest me some useful link for this problem which help me in this regard.
the paper is attached below. if some one need my CST file then I well also upload it.

Hi,
I hope you are doing well. I want some help about this structure design in CST,because I am new in this field. Antenna is operating fo 915MHz. the all other paremeters are given in pics like substrate, length, gap etc.