The BPF-12000-12020-L9 from COTS RF is a Band Pass Filter with Frequency 11500 to 12500 MHz, Bandwidth 1000 MHz @ 1 dB, Center Frequency 12000 MHz, Insertion Loss 1 dB, Rejection 30dB @ 5391 & 19811 MHz. Tags: Module with Connectors. More details for BPF-12000-12020-L9 can be seen below.