The B089NC4S from Knowles is a Band Pass Filter with Frequency 8.1 to 10.1 GHz, Bandwidth 2000 MHz, Center Frequency 9.1 GHz, Insertion Loss 2.5 to 2.75 dB, Rejection 40 to 50 dB. Tags: Surface Mount, Ceramic Filter. More details for B089NC4S can be seen below.