The SiMS11/2R1-8D2 from Sainty-Tech Communications Limited is a Band Pass Filter with Frequency 10 to 12 GHz, Center Frequency 11 GHz, Insertion Loss 1.6 dB, Rejection 30 dB @9.2GHz&13GHz, 40 dB @8.8GHz&13.2GHz, 60 dB @DC~8.5GHz, 60 dB @14~17GHz, Upper Rejection 30 to 60 dB. Tags: Surface Mount, Cavity Filter. More details for SiMS11/2R1-8D2 can be seen below.