The QBF-18000-23000-50 from Qualwave is a Band Pass Filter with Frequency 18 to 23 GHz, Bandwidth 5000 MHz, Center Frequency 20500 MHz, Insertion Loss 1 dB, Upper Rejection 50 dB @24 to 36 GHz. Tags: Module with Connectors. More details for QBF-18000-23000-50 can be seen below.