The QBF-5640-5660-50 from Qualwave is a Band Pass Filter with Frequency 5.64 to 5.66 GHz, Bandwidth 20 MHz, Center Frequency 5650 MHz, Insertion Loss 0.6 dB, Upper Rejection 50 [email protected] to 18 GHz. Tags: Module with Connectors. More details for QBF-5640-5660-50 can be seen below.