The QBF-12000-18000-50 from Qualwave is a Band Pass Filter with Frequency 12 to 18 GHz, Bandwidth 6000 MHz, Center Frequency 15000 MHz, Insertion Loss 1 dB, Upper Rejection 50 dB @20.8 GHz. Tags: Module with Connectors. More details for QBF-12000-18000-50 can be seen below.