The SiMF3R4/1R3-7D3 from Sainty-Tech Communications Limited is a Band Pass Filter with Frequency 2.75 to 4.13 GHz, Center Frequency 3.44 GHz, Insertion Loss 1.5 dB, Rejection 30 dB @2.5GHz&4.8 GHz, 40 dB @2.0GHz&5.2GHz, 60 dB @DC~1.6GHz, 60 dB @6.1~9GHz, Upper Rejection 30 to 60 dB. Tags: Surface Mount, Cavity Filter. More details for SiMF3R4/1R3-7D3 can be seen below.