The BFCN-1900 from Mini Circuits is a Band Pass Filter with Frequency 1.893 to 1.92 GHz, Center Frequency 1900 MHz, Insertion Loss 2.6 to 3.2 dB, Rejection 25 to 50 dB, Upper Rejection 25 to 50 dB. Tags: Surface Mount, Ceramic, Ceramic Filter. More details for BFCN-1900 can be seen below.