The B112MB1S from Knowles is a Band Pass Filter with Frequency 10.75 to 11.75 GHz, Bandwidth 1000 MHz, Center Frequency 11.2 GHz, Insertion Loss 2.5 to 2.75 dB, Rejection 40 to 50 dB. Tags: Surface Mount, Ceramic Filter. More details for B112MB1S can be seen below.