The SiMF3R5/1-7D2 from Sainty-Tech Communications Limited is a Band Pass Filter with Frequency 3 to 4 GHz, Center Frequency 3.5 GHz, Insertion Loss 2.5 dB, Rejection 30 dB @2.5GHz&4.55GHz, 40 dB @2.25GHz&4.7GHz, 60 dB @DC~1.7GHz, 60 dB @6~8.5GHz, Upper Rejection 30 to 60 dB. Tags: Surface Mount, Cavity Filter. More details for SiMF3R5/1-7D2 can be seen below.