The SiMF11R5/1-8D3 from Sainty-Tech Communications Limited is a Band Pass Filter with Frequency 11 to 12 GHz, Center Frequency 11.5 GHz, Insertion Loss 2.5 dB, Rejection 30 dB @10.3GHz&12.85GHz, 40 dB @10.1GHz&13 GHz, 60 dB @DC~9.5GHz, 55 dB @14~20GHz, Upper Rejection 30 to 55 dB. Tags: Surface Mount, Cavity Filter. More details for SiMF11R5/1-8D3 can be seen below.