hi everybody, i have another question about vivaldi antenna

i am reading some papers about this antennas, but i have another question: how can I get the equations for to determinate the curvature of the flares and how can i drawing or with which tool can i do this in the software HFSS?......

i think that will be a good idea design an antipodal vivaldi antenna in the range of 1-5Ghz, with the substrate Rogers RO4350B.



Thanks again for your answers, that is a very very good help for me.

hi
for simulation in hfss and design of antipodal u have some way draw by tool or give the equation to hfss for more information about antipodal u can read chapter 5 of Broadband Planar Antennas Design and Applications by Zhi Ning Chen and Michael Y. W. Chia and u can download a thesis by topic of UWB-Antennas for Wall Penetrating Radar Systems if u google it

hi ferdows thanks for you help me =) i will check it ok, i hope to help me =)