The SiMF8R4/1R2-8D2 from Sainty-Tech Communications Limited is a Band Pass Filter with Frequency 7.8 to 9 GHz, Center Frequency 8.4 GHz, Insertion Loss 2.5 dB, Rejection 30 dB @7.15GHz&9.8GHz, 40 dB @7GHz&10GHz, 60 dB @DC~6GHz, 60 dB @10.5~14GHz, Upper Rejection 30 to 60 dB. Tags: Surface Mount, Cavity Filter. More details for SiMF8R4/1R2-8D2 can be seen below.