The SiMF11R5/4-9D1 from Sainty-Tech Communications Limited is a Band Pass Filter with Frequency 9.4 to 13.5 GHz, Center Frequency 11.5 GHz, Insertion Loss 1.3 dB, Rejection 40 dB @DC~7.8GHz, 40 dB @15.8~20GHz, Upper Rejection 40 dB. Tags: Surface Mount, Cavity Filter. More details for SiMF11R5/4-9D1 can be seen below.