Ie3d mutual coupling

Hi
I m also working with microstrip patch antenna pls tell me how to check s12 or s21 parameter using ie3d software pls pls pls help me

Thanks in adv

The software can not tell you S21 of antenna, I guess so.
Except you setup a receiving antenna, and test the finally received signal from the receiving antenna. Then comparing your antenna with a known antenna, maybe you can know the S21 of your antenna without test.
I have never used IE3D before. Thta's just my assumption.

But still as much I know it's reciprocal of each other I got s21 but my guide wants the graph of s12 thn which are the ie3d steps to find s12.

Antenna is a one port device..? how many antennas are u simulating ?