The SiMF4R5/1-7D3 from Sainty-Tech Communications Limited is a Band Pass Filter with Frequency 4 to 5 GHz, Center Frequency 4.5 GHz, Insertion Loss 2.5 dB, Rejection 30 dB @3.5GHz&5.5GHz, 40 dB @3.3GHz&5.6GHz, 60 dB @DC~3GHz, 60 dB @6~10GHz, Upper Rejection 30 to 60 dB. Tags: Surface Mount, Cavity Filter. More details for SiMF4R5/1-7D3 can be seen below.