The QBF-3450-3550-90 from Qualwave is a Band Pass Filter with Frequency 3.45 to 3.55 GHz, Bandwidth 100 MHz, Center Frequency 3500 MHz, Insertion Loss 2 dB, Upper Rejection 90 [email protected] to 8 GHz. Tags: Module with Connectors. More details for QBF-3450-3550-90 can be seen below.