The SiMF3R2/1R4-9D2 from Sainty-Tech Communications Limited is a Band Pass Filter with Frequency 2.5 to 3.9 GHz, Center Frequency 3.2 GHz, Insertion Loss 2.5 dB, Rejection 30 dB @2.0GHz&4.6GHz, 40 dB @1.9GHz&4.7GHz, 60 dB @DC~1.5GHz, 60 dB @5~8.5GHz, Upper Rejection 30 to 60 dB. Tags: Surface Mount, Cavity Filter. More details for SiMF3R2/1R4-9D2 can be seen below.