The AFL-18000 from Atlantic Microwave is a Low Pass RF Filter with Frequency DC - 16.2 GHz, Stopband Frequency 20.7 - 24 GHz, 3 dB Cutoff Frequency 18 GHz, Insertion Loss 1 dB, Rejection 50 dB at 20.7 - 24 GHz. Tags: Module with Connector. More details for AFL-18000 can be seen below.