The SiMF3/1-7D1 from Sainty-Tech Communications Limited is a Band Pass Filter with Frequency 2.5 to 3.5 GHz, Center Frequency 3 GHz, Insertion Loss 2 dB, Rejection 30 dB @2GHz&4.15GHz, 40 dB @1.8GHz&4.3GHz, 55 dB @DC~1.5GHz, 60 dB @5~7GHz, Upper Rejection 30 to 60 dB. Tags: Surface Mount, Cavity Filter. More details for SiMF3/1-7D1 can be seen below.