The SiMS17/1R5-12D2 from Sainty-Tech Communications Limited is a Band Pass Filter with Frequency 16.25 to 17.75 GHz, Center Frequency 17 GHz, Insertion Loss 3.3 dB, Rejection 30 dB @15.5GHz&18.65GHz, 40 dB @15.3GHz&18.8GHz, 50 dB @DC~15GHz, 40 dB @18.8~31GHz, Upper Rejection 30 to 40 dB. Tags: Surface Mount, Cavity Filter. More details for SiMS17/1R5-12D2 can be seen below.