Problem faced with ansoft designer

hi all,
i am facing a problem with my simulation and i think i have to know how this ansoft designer works..........anyone give me the theoretical approach.....it may be consist of mathmatical example....please help me..

whats your problem?

thanks sir for your email.......i want to design a microstirp antenna on finite ground and wants to describe the phenomena mathmatically..........i did not find any help mathmatically all about how to simulate microstip antenna.
if u have any suggestion please give me this as early as possible because my papers deadline is about 15th December.

thanks in advance.