How do i know if my simulation of antenna is success

hi,
Thanks to edaboard in helping various projects related to antenna engineering
my doubt is if i finish simulation of patch antenna with what basic parameters like VSWR return loss values i can say i designed correct or good antenna ?and proceed to fabrication of antenna.

If you are getting good return loss and antenna gain in desired frequency band then simulation data should be ok. To cross check, you can simulated same project using different EM technique ( like FEM, FDTD, Methos-of-moment), simulation result should be close with all solvers.