The SiMF5R4/R4-6E4 from Sainty-Tech Communications Limited is a Band Pass Filter with Frequency 5.25 to 5.5 GHz, Center Frequency 5.38 GHz, Insertion Loss 2.5 dB, Rejection 30 dB @4.9&5.91GHz, 40 dB @4.7&5.94GHz, 60 dB @DC~4.24GHz, 60 dB @6.4~11.5GHz, Upper Rejection 30 to 60 dB. Tags: Surface Mount, Cavity Filter. More details for SiMF5R4/R4-6E4 can be seen below.