The QBF-11487-12000-30 from Qualwave is a Band Pass Filter with Frequency 11.487 to 12 GHz, Bandwidth 513 MHz, Center Frequency 11743.5 MHz, Insertion Loss 2 dB, Lower Rejection 10 to 30 dB. Tags: Module with Connectors, Flatpack. More details for QBF-11487-12000-30 can be seen below.