The QBF-27500-31000-40 from Qualwave is a Band Pass Filter with Frequency 27.5 to 31 GHz, Bandwidth 3500 MHz, Center Frequency 29250 MHz, Insertion Loss 1.5 dB, Upper Rejection 60 dB @31.9GHz. Tags: Module with Connectors. More details for QBF-27500-31000-40 can be seen below.