The B148QF0S from Knowles is a Band Pass Filter with Frequency 12 to 18 GHz, Bandwidth 6000 MHz, Center Frequency 15000 MHz, Insertion Loss 3.1 to 3.6 dB, Rejection DC to 7.6 GHz (40 dB), 22.5 to 25 GHz (30 dB). Tags: PCB Mount, Ceramic, Ceramic Filter. More details for B148QF0S can be seen below.