The QBF-818-918-45 from Qualwave is a Band Pass Filter with Frequency 0.818 to 0.918 GHz, Bandwidth 100 MHz, Center Frequency 868 MHz, Insertion Loss 3 dB, Upper Rejection 45 [email protected] GHz. Tags: Module with Connectors. More details for QBF-818-918-45 can be seen below.