The QBF-2900-3600-50 from Qualwave is a Band Pass Filter with Frequency 2.9 to 3.6 GHz, Bandwidth 700 MHz, Center Frequency 3250 MHz, Insertion Loss 1 dB, Upper Rejection 50 [email protected] to 7 GHz. Tags: Module with Connectors. More details for QBF-2900-3600-50 can be seen below.