The AB2533B594 from Anatech Electronics is a Band Pass Filter with Frequency 2.5 to 2.57 GHz, Bandwidth 73 MHz, Center Frequency 2533 MHz, Insertion Loss 1.1 dB, Upper Rejection 60 dBc @ + 75 MHz from Center Frequency. Tags: Module with Connectors, Cavity Filter. More details for AB2533B594 can be seen below.