The SiMS18R5/1-6S3 from Sainty-Tech Communications Limited is a Band Pass Filter with Frequency 18 to 19 GHz, Center Frequency 18.5 GHz, Insertion Loss 2.5 dB, Rejection 30 dB @17.3GHz&20.2GHz, 40 dB @17.1GHz&21.5GHz, 55 dB @DC~16GHz, 45 dB @22~26GHz, Upper Rejection 30 to 45 dB. Tags: Surface Mount, Cavity Filter. More details for SiMS18R5/1-6S3 can be seen below.