The QBF-21000-28000-50 from Qualwave is a Band Pass Filter with Frequency 21 to 28 GHz, Bandwidth 7000 MHz, Center Frequency 24500 MHz, Insertion Loss 1 dB, Upper Rejection 50 dB @30 to 35 GHz. Tags: Module with Connectors. More details for QBF-21000-28000-50 can be seen below.