The QBF-4000-6000-70 from Qualwave is a Band Pass Filter with Frequency 4 to 6 GHz, Bandwidth 2000 MHz, Center Frequency 5000 MHz, Insertion Loss 2 dB, Upper Rejection 70 [email protected] to 8 GHz. Tags: Module with Connectors. More details for QBF-4000-6000-70 can be seen below.