The QBF-18000-20000-30 from Qualwave is a Band Pass Filter with Frequency 18 to 20 GHz, Bandwidth 2000 MHz, Center Frequency 19000 MHz, Insertion Loss 2 dB, Upper Rejection 30 dB @20.8 to 30 GHz. Tags: Module with Connectors. More details for QBF-18000-20000-30 can be seen below.