The QBF-1950-2050-40 from Qualwave is a Band Pass Filter with Frequency 1.95 to 2.05 GHz, Bandwidth 100 MHz, Center Frequency 2000 MHz, Insertion Loss 2 dB, Upper Rejection 40 [email protected] GHz. Tags: Module with Connectors. More details for QBF-1950-2050-40 can be seen below.