The AFL-01000 from Atlantic Microwave is a Low Pass RF Filter with Frequency DC - 0.9 GHz, Stopband Frequency 1.15 - 4 GHz, 3 dB Cutoff Frequency 1 GHz, Insertion Loss 1 dB, Rejection 50 dB at 1.15 - 4 GHz. Tags: Module with Connector. More details for AFL-01000 can be seen below.