what is powel optimizer and E.M optimization

i want to know what is Powel optimizer and E.M.optimization In IE3d.and how can i use it.
i have design a sqaure patch which has two slots. i m getting two frequencies 1st is 2.4298,return loss(-13.86) and 2nd is 3.2 return loss(-8.84).i want to use powel optimizer and E.M. optimizer on it.so how can i use it plz guide me