The SiMF4R06/R8-7D2 from Sainty-Tech Communications Limited is a Band Pass Filter with Frequency 3.66 to 4.46 GHz, Center Frequency 4.06 GHz, Insertion Loss 2.8 dB, Rejection 30 dB @3.25GHz&4.9GHz, 40 dB @3.1GHz&5GHz, 60 dB @DC~2.8GHz, 60 dB @5.15~10.5GHz, Upper Rejection 30 to 60 dB. Tags: Surface Mount, Cavity Filter. More details for SiMF4R06/R8-7D2 can be seen below.