how to down the frequency of a ultrawideband(UWB) antenna to match the index

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Tomsin yin

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hi guys
now am designing a UWB antenna and the work frequcncy is 2~10Ghz,but when i simulate it,i got a good result from 3Ghz to 11Ghz.so can somebody help me to give me some advice about that how to obtain the perfect result in the lower limit frequency,that~2Ghz.my design and simulation is done in CST.**broken link removed**
ty in adcance.

- - - Updated - - -

am sorry for that the uploaded file is not correct,the correct file as follow:
 

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  • CST DESIGN ENVIRONMENT.exe
    35.9 MB · Views: 230
  • UWB antenna.zip
    10.1 KB · Views: 99

hi chuckey
thnx for ur help,so chould u give me some advice about how can i get the good result at the frequency 2Ghz.
 

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