The CB1850/300SK-D2 from G-WAY Microwave is a Band Pass Filter with Frequency 1700 to 2000 MHz, Bandwidth 300 MHz, Center Frequency 1850 MHz, Insertion Loss 0.7 dB, Rejection 70 to 75 dB. Tags: Module with Connectors, Cavity Filter. More details for CB1850/300SK-D2 can be seen below.