The CBPFS-1880 from Crystek Corporation is a Band Pass Filter with Frequency 1.85 to 1.91 GHz, Bandwidth 60 MHz, Center Frequency 1880 MHz, Insertion Loss 3.5 dB, Rejection 12 to 39 dB. Tags: Module with Connectors, RF SAW Filter. More details for CBPFS-1880 can be seen below.