The QBF-27500-28500-60 from Qualwave is a Band Pass Filter with Frequency 27.5 to 28.5 GHz, Bandwidth 1000 MHz, Center Frequency 28000 MHz, Insertion Loss 2 dB, Upper Rejection 60 dB @29.5 GHz. Tags: Module with Connectors. More details for QBF-27500-28500-60 can be seen below.