Can we use more than 1 port in ie3d .................?

can i use more than 1 port in a fractal antenna in IE3D?..
I could not found better result for a single port but i found the best result for 2 ports....
how to shift a frequency (ex. i need 900mhz but results are good for 990mhz. so how to shift frequency in this problem?)
plz help me as soon as possible...

you can shift your frequency by working on feed point and by slightly change of the lenth and the width of your patch.
and yes you can use 2 ports in ie3d but i dont think that using 2 port will be good option for getting the good results.
work more on the 1 port by doing this you will get more knowledge about the practical work.