The SiMF5R55/1R1-2 from Sainty-Tech Communications Limited is a Band Pass Filter with Frequency 5 to 6.1 GHz, Center Frequency 5.55 GHz, Insertion Loss 2 dB, Rejection 30 dB @4.39&6.63GHz, 40 dB @4.1&6.7GHz, 60 dB @DC~3.7GHz, 60 dB @7~14GHz, Upper Rejection 30 to 60 dB. Tags: Surface Mount, Cavity Filter. More details for SiMF5R55/1R1-2 can be seen below.