The BFCN-1945 from Mini Circuits is a Band Pass Filter with Frequency 1.85 to 2.04 GHz, Center Frequency 1945 MHz, Insertion Loss 3 dB, Rejection 20 to 25 dB, Upper Rejection 20 to 25 dB. Tags: Surface Mount, Ceramic, Ceramic Filter. More details for BFCN-1945 can be seen below.