rfid loop antenna

Hi,

My project is to creat a loop antenna for rfid (13.56Mhz), i design the antenna with hfss but i cannot find the good excitation for my structure.

In fact the best excitation will be differental but i don't know how to do (May be with 2 lumped port ?) ! ! ! !

Thank's

in HFSS it is not so difficult to creat the differential ports, you can use lumped port,or using two ports while you editing the two ports paremeter.
hope it can help you