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Help on desgin of a Vivaldi antenna

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bimboom

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Hello everybody,

I have some troubles with designing a vivaldi antenna which should work
in the range frequency 0.6 to 4.8GHz.
The main problems come from the matching of this antenna. I tried many times to
get the S11<-10dB for the frequencies below 1.2GHz, but I didn't get the perfect
matching.
How can I improve the matching in those low frequencies?? Is there special hints that
are used for the matching in low frequencies??
Thank you in advance.
 

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