The QBF-1950-2050-60 from Qualwave is a Band Pass Filter with Frequency 1.95 to 2.05 GHz, Bandwidth 100 MHz, Center Frequency 2000 MHz, Insertion Loss 3 dB, Upper Rejection 60 [email protected] GHz. Tags: Surface Mount. More details for QBF-1950-2050-60 can be seen below.