The SiMF12R5/R7-8D3 from Sainty-Tech Communications Limited is a Band Pass Filter with Frequency 11.6 to 13.1 GHz, Center Frequency 11.65 GHz, Insertion Loss 2.5 dB, Rejection 20 dB @10.9GHz&13.75GHz, 30 dB @10.7GHz&13.85GHz, 60 dB @DC~10GHz, Upper Rejection 20 to 30 dB. Tags: Surface Mount, Cavity Filter. More details for SiMF12R5/R7-8D3 can be seen below.