The SiMF3R6/R4-7D3 from Sainty-Tech Communications Limited is a Band Pass Filter with Frequency 3.4 to 3.8 GHz, Center Frequency 3.5 GHz, Insertion Loss 4 dB, Rejection 30 dB @3.04GHz&4.12GHz, 40 dB @2.9GHz&4.2GHz, 60 dB @DC~2.5GHz, 60 dB @4.26~9.15GHz, Upper Rejection 30 to 60 dB. Tags: Surface Mount, Cavity Filter. More details for SiMF3R6/R4-7D3 can be seen below.