The BFCN-1840 from Mini Circuits is a Band Pass Filter with Frequency 1.75 to 1.93 GHz, Bandwidth 180 MHz, Center Frequency 1840 MHz, Insertion Loss 3 dB, Rejection 20 dB @ 1480 and 2860 MHz. Tags: Surface Mount, Ceramic, Ceramic Filter. More details for BFCN-1840 can be seen below.