The SiMF12/4-9D2 from Sainty-Tech Communications Limited is a Band Pass Filter with Frequency 10 to 14 GHz, Center Frequency 12 GHz, Insertion Loss 3.8 dB, Rejection 30 dB @8.5GHz&15.6GHz, 40 dB @8.2GHz&15.8GHz, 60 dB @DC~7GHz, 55 dB @16~20GHz, Upper Rejection 30 to 55 dB. Tags: Surface Mount, Cavity Filter. More details for SiMF12/4-9D2 can be seen below.