The SiMF3R5/R8-8D2 from Sainty-Tech Communications Limited is a Band Pass Filter with Frequency 3.1 to 3.9 GHz, Center Frequency 3.5 GHz, Insertion Loss 2 dB, Rejection 30 dB @2.75GHz&4.35GHz, 40 dB @2.65GHz&4.4GHz, 60 dB @DC~2.4GHz, 60 dB @4.65~9.1GHz, Upper Rejection 30 to 60 dB. Tags: Surface Mount, Cavity Filter. More details for SiMF3R5/R8-8D2 can be seen below.