The BFCN-3700+ from Mini Circuits is a Band Pass Filter with Frequency 3000 to 4600 MHz, Center Frequency 3700 MHz, Insertion Loss 1.9 to 3.5 dB, Upper Rejection 10 to 24 dB, Lower Rejection 21 to 28 dB. Tags: Ceramic, Ceramic Filter. More details for BFCN-3700+ can be seen below.