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                Filter) 
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                    (Maximally Flat) ¿¹Á¦ Butterworth 
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 n=3,5,7,9   fc=2000MHz 
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 n=3,5,7,9 
                      fc=2000MHz   BW=200MHz   Zo=50¥Ø   Ripple=0.2dB 
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