The SiMF5/2R2-8D3 from Sainty-Tech Communications Limited is a Band Pass Filter with Frequency 4 to 6 GHz, Center Frequency 5 GHz, Insertion Loss 1.5 dB, Rejection 30 dB @3.4&6.9GHz, 40 dB @3&7.45GHz, 60 dB @DC~2.7GHz, 55 dB @8~13.5GHz, Upper Rejection 30 to 55 dB. Tags: Surface Mount, Cavity Filter. More details for SiMF5/2R2-8D3 can be seen below.