The SiMF8R8/R1-4E3 from Sainty-Tech Communications Limited is a Band Pass Filter with Frequency 8.78 to 8.82 GHz, Center Frequency 8.8 GHz, Insertion Loss 3.5 dB, Rejection 25 dB @8.5GHz&9.2GHz, 40 dB @8.4GHz&9.3GHz, 60 dB @DC~7GHz, 50 dB @11~13GHz, Upper Rejection 25 to 50 dB. Tags: Surface Mount, Cavity Filter. More details for SiMF8R8/R1-4E3 can be seen below.