The SiMF10R54/4R18-3 from Sainty-Tech Communications Limited is a Band Pass Filter with Frequency 8.6 to 12.5 GHz, Center Frequency 10.55 GHz, Insertion Loss 1.5 dB, Rejection 30 dB @6.8GHz&13.9GHz, 40 dB @6&14.2GHz, 60 dB @DC~9GHz, Upper Rejection 30 to 40 dB. Tags: Surface Mount, Cavity Filter. More details for SiMF10R54/4R18-3 can be seen below.