The AB1650B518 from Anatech Electronics is a Band Pass Filter with Frequency 1.64 to 1.66 GHz, Bandwidth 20 MHz, Center Frequency 1650 MHz, Insertion Loss 2.5 dB, Upper Rejection 45 dB @ 1665 MHz. Tags: Module with Connectors, Cavity Filter. More details for AB1650B518 can be seen below.