The SiMF12R5/3-8D2 from Sainty-Tech Communications Limited is a Band Pass Filter with Frequency 11 to 14 GHz, Center Frequency 12.5 GHz, Insertion Loss 2 dB, Rejection 30 dB @9.9GHz&15.2GHz, 40 dB @9.6GHz&15.5GHz, 60 dB @DC~8.8GHz, 55 dB @15.9~19GHz, Upper Rejection 30 to 55 dB. Tags: Surface Mount, Cavity Filter. More details for SiMF12R5/3-8D2 can be seen below.