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Differential Port for a Slot Antenna

Question asked by msaleh87 on Jul 16, 2014
Latest reply on Jul 21, 2014 by volker_muehlhaus
Dear all,

I want to simulate a slot antenna (just a slot in an infinite ground plane). I define two pins at the center of the two edges of the slot as shown in the attached. Under port setup I make those two pins as one port by grading the + pin of port 2 to the GND pin of port 1, and they show correctly as one port in the 3D em View. 

However, when I start simulation, the following warning comes, and results are rubbish:

*"The port setup needed to be corrected:*
*Calibration will not be used for port "P1" (pin*
*sets {"P1"} and {"P2"} are in different*
*reference planes, although identical reference*
*planes are required for TML calibration).*

The two ports "I think" have the same reference plane because I place them using snap mode so they have the same x-coorinate

So what could be wrong

Is this the correct way to define such a port for a slot antenna