The SiMF4R35/R3-5D2 from Sainty-Tech Communications Limited is a Band Pass Filter with Frequency 4.2 to 4.5 GHz, Center Frequency 4.35 GHz, Insertion Loss 3.5 dB, Rejection 30 dB @3.85GHz&4.95GHz, 40 dB @3.75GHz&5.05GHz, 60 dB @DC~3.6GHz, 60 dB @5.3~11.1GHz, Upper Rejection 30 to 60 dB. Tags: Surface Mount, Cavity Filter. More details for SiMF4R35/R3-5D2 can be seen below.