The SiMS20R7/1-6S3 from Sainty-Tech Communications Limited is a Band Pass Filter with Frequency 20.2 to 21.2 GHz, Center Frequency 20.7 GHz, Insertion Loss 2.6 dB, Rejection 30 dB @19.55GHz&22.5GHz, 40 dB @19.4GHz&23.1GHz, 60 dB @DC~9GHz, 45 dB @24~25GHz, Upper Rejection 30 to 45 dB. Tags: Surface Mount, Cavity Filter. More details for SiMS20R7/1-6S3 can be seen below.