The QBF-11900-12100-60 from Qualwave is a Band Pass Filter with Frequency 11.9 to 12.1 GHz, Bandwidth 200 MHz, Center Frequency 12000 MHz, Insertion Loss 3 dB, Upper Rejection 60 dB @12.8 GHz. Tags: Module with Connectors. More details for QBF-11900-12100-60 can be seen below.