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Simulation question in EM mode for antenna

Question asked by k80393308 on Mar 31, 2020
Latest reply on Apr 6, 2020 by volker_muehlhaus

I just want to simulate an RFID antenna to compare with real one measured by VNA. Layout, which follows the real one sample, just like following with 2 ports. And due to de-embedding issue, these two ports can only setup as Internal Mode. 

Antenna layout with two ports.

Layout dimension

The result of this antenna is like following, it has huge difference between real sample.

The peak frequency should around 900MHz rather than over 1.1GHz.

Peak freq

 

Is anyone could give me a hint why I get this difference, I know it might have something wrong for my setup.

I try to modify the dimension slightly or offset for port 1/2, but it turn out same result, over 1.1GHz.

 

Here are some setup details as following,

Substrate setup

Ports setup

I try to place port2 on the edge of conductor, but it shows an error msg, "port cannot be defined as partially on the perimeter of structure partially inside the structure.".

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