The SiMS8/3-9D2 from Sainty-Tech Communications Limited is a Band Pass Filter with Frequency 6.5 to 9.5 GHz, Center Frequency 8 GHz, Insertion Loss 0.8 dB, Rejection 30 dB @4.8GHz&11.2GHz, 40 dB @4GHz&11.6GHz, 55 dB @DC~2GHz, 45 dB @12~20GHz, Upper Rejection 30 to 45 dB. Tags: Surface Mount, Cavity Filter. More details for SiMS8/3-9D2 can be seen below.