wideband integrated feeding system for spiral antenna

[sara67]

Hi guys

I'm working in a integrated feeding system for a type of spiral antenna

my antenna work very well , I have a return loss better than -10dB in 2-12 GHz
my Balun work very well too
but when I connect them together
my results are so bad and I dont have a wide band

Can anyone help me ?

 

[hanyahmedeg]

hiiiiiiiiiiiiiiii sarah
i think you should make a good matching between them regarding to its impedance