The CB2309/28SK-C1 from G-WAY Microwave is a Band Pass Filter with Frequency 2295 to 2323 MHz, Bandwidth 28 MHz, Center Frequency 2309 MHz, Insertion Loss 0.55 to 0.7 dB, Rejection 55 to 65 dB. Tags: Module with Connectors, Cavity Filter. More details for CB2309/28SK-C1 can be seen below.