The SiMF3/2-10D2 from Sainty-Tech Communications Limited is a Band Pass Filter with Frequency 2 to 4 GHz, Center Frequency 3 GHz, Insertion Loss 3.8 dB, Rejection 30 dB @1.25GHz&4.8GHz, 40 dB @0.8GHz&5GHz, 60 dB @DC~0.2GHz, 60 dB @5.2GHz, Upper Rejection 30 to 60 dB. Tags: Surface Mount, Cavity Filter. More details for SiMF3/2-10D2 can be seen below.