The SiMF2R9/R4-7D3 from Sainty-Tech Communications Limited is a Band Pass Filter with Frequency 2.7 to 3.1 GHz, Center Frequency 2.9 GHz, Insertion Loss 2.7 dB, Rejection 30 dB @2.4GHz&3.45GHz, 40 dB @2.3GHz&3.6GHz, 60 dB @DC~2.1GHz, 60 dB @3.65~7.5GHz, Upper Rejection 30 to 60 dB. Tags: Surface Mount, Cavity Filter. More details for SiMF2R9/R4-7D3 can be seen below.