The SiMF11R5/5-11D1 from Sainty-Tech Communications Limited is a Band Pass Filter with Frequency 9 to 14 GHz, Center Frequency 11.5 GHz, Insertion Loss 1.5 dB, Rejection 25 dB @7.8GHz&15.9GHz, 40 dB @5.4GHz&16.7GHz, 60 dB @DC~6.5GHz, 40 dB @16~20GHz, Upper Rejection 25 to 40 dB. Tags: Surface Mount, Cavity Filter. More details for SiMF11R5/5-11D1 can be seen below.