The SiMF9R55/R4-4E3 from Sainty-Tech Communications Limited is a Band Pass Filter with Frequency 9.4 to 9.7 GHz, Center Frequency 9.55 GHz, Insertion Loss 3 dB, Rejection 30 dB @9GHz&12.1GHz, 40 dB @8GHz&12.05GHz, 60 dB @DC~5GHz, Upper Rejection 30 to 40 dB. Tags: Surface Mount, Cavity Filter. More details for SiMF9R55/R4-4E3 can be seen below.