about tunable filter

hello!I want to design a tunable filter:
frequency:1200MHz~2500MHz
BW3dB:50MHz
BW30dB/BW3dB=7
Insert Loss at center frequency:2.5dB
who can give me some suggest?Thanks!

This is a sample for 0.7- 1.33GHz. May be it will helpfull to you.
Good luck!