The QBF-3800-6800-60 from Qualwave is a Band Pass Filter with Frequency 3.8 to 6.8 GHz, Bandwidth 3000 MHz, Center Frequency 5300 MHz, Insertion Loss 1 dB, Upper Rejection 60 [email protected] to 9 GHz. Tags: Module with Connectors. More details for QBF-3800-6800-60 can be seen below.