The SiMF12R5/1-7D2 from Sainty-Tech Communications Limited is a Band Pass Filter with Frequency 12 to 13 GHz, Center Frequency 12.5 GHz, Insertion Loss 3.5 dB, Rejection 30 dB @11.2&13.95GHz, 40 dB @11&14.1GHz, Upper Rejection 30 to 40 dB. Tags: Surface Mount, Cavity Filter. More details for SiMF12R5/1-7D2 can be seen below.