The SiMS20/1R4-6D2 from Sainty-Tech Communications Limited is a Band Pass Filter with Frequency 19.3 to 20.6 GHz, Center Frequency 20 GHz, Insertion Loss 2.5 dB, Rejection 30 dB @18.25GHz&21.5GHz, 40 dB @17.65GHz&22.15GHz, 55 dB @DC~17.2GHz, 45 dB @22.2~29.4GHz, Upper Rejection 30 to 45 dB. Tags: Surface Mount, Cavity Filter. More details for SiMS20/1R4-6D2 can be seen below.