The SiMF8R8/R4-7D4 from Sainty-Tech Communications Limited is a Band Pass Filter with Frequency 8.6 to 9 GHz, Center Frequency 8.8 GHz, Insertion Loss 2.5 dB, Rejection 30 dB @8.05GHz&9.65GHz, 40 dB @7.85GHz&9.8GHz, 60 dB @DC~7GHz, 60 dB @11~13GHz, Upper Rejection 30 to 60 dB. Tags: Surface Mount, Cavity Filter. More details for SiMF8R8/R4-7D4 can be seen below.