The CL12D57-300-CD-SFF from Quantic PMI (Planar Monolithics) is a Band Pass Filter with Frequency 12.42 to 12.72 GHz, Bandwidth 300 MHz, Center Frequency 12570 MHz, Insertion Loss 4 dB, Rejection 40dB @ DC to 12.37GHz and 40dB @ 12.87 to 37.71GHz. Tags: Module with Connectors, Combline Filter. More details for CL12D57-300-CD-SFF can be seen below.