The QBF-3000-4300-50 from Qualwave is a Band Pass Filter with Frequency 3 to 4.3 GHz, Bandwidth 1300 MHz, Center Frequency 3650 MHz, Insertion Loss 1 dB, Upper Rejection 50 dB@5 to 7 GHz. Tags: Module with Connectors. More details for QBF-3000-4300-50 can be seen below.