single element vivaldi antenna designing

Where is the Question.

can any one give me proper designing steps for 1 & 8 element vivaldi tapered slot with microstrip feed antenna with power divider network(50 ohm ) for s-band(3.1-3.5GHz) to get 3dB gain, 3dBi directivity.50 ohm(input) to 100 ohm transition(tapered feed )

can i use frequency range from 2-8 GHz for this?