broad band antenna design with high power handling

[kami70b]

i want to design a broadband antena from 1 to 30 ghz havind gain 10 dbi and power of 250 watts i need ur help guys.
please tell me from where i can get relevant information if u have any paper tht would be appreciated

 

[akedar]

try designing metallic vivaldi antenna or archimedan spiral family