The B148LA2S from Knowles is a Band Pass Filter with Frequency 14.5 to 15 GHz, Bandwidth 500 MHz, Center Frequency 14.75 GHz, Insertion Loss 3.25 to 3.5 dB, Rejection 40 to 45 dB. Tags: Surface Mount, Ceramic Filter. More details for B148LA2S can be seen below.