The SiMF8R3/R4-6E3 from Sainty-Tech Communications Limited is a Band Pass Filter with Frequency 8.15 to 8.4 GHz, Center Frequency 8.3 GHz, Insertion Loss 3.5 dB, Rejection 30 dB @7.75GHz&8.85GHz, 40 dB @7.5GHz&9.05GHz, 60 dB @DC~6GHz, 50 dB @10~11.5GHz, Upper Rejection 30 to 60 dB. Tags: Surface Mount, Cavity Filter. More details for SiMF8R3/R4-6E3 can be seen below.