The SiMF11R4/1R2-8D3 from Sainty-Tech Communications Limited is a Band Pass Filter with Frequency 10.8 to 12 GHz, Center Frequency 11.4 GHz, Insertion Loss 3 dB, Rejection 30 dB @10GHz&12.75GHz, 40 dB @9.8GHz&12.85GHz, 60 dB @DC~9.5GHz, 50 dB @13~18GHz, Upper Rejection 30 to 50 dB. Tags: Surface Mount, Cavity Filter. More details for SiMF11R4/1R2-8D3 can be seen below.