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IE3D and HFSS, different results, why?

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fangyuanhust

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I've simulated an RFID tag antenna by both ie3d and hfss.
(The antenna is posted by K. V. Seshagiri Rao, in the paper "Antenna Design for UHF RFID Tags A Review and a Practical Application".)
But there are big differences in the results.
In ie3d, the impedance at 875Mhz is about 50+j420.(close to the result in the paper)
While in HFSS it's about 37+j320.

anyone know the reason?

The hfss model is in the attachment.
 

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