The BFCN-1690 from Mini Circuits is a Band Pass Filter with Frequency 1.57 to 1.81 GHz, Center Frequency 1690 MHz, Insertion Loss 2.5 to 5 dB, Rejection 5 to 30 dB, Upper Rejection 5 to 30 dB. Tags: Surface Mount, Ceramic, Ceramic Filter. More details for BFCN-1690 can be seen below.