The FLP-4300 from Marki Microwave is a Low Pass RF Filter with Frequency DC to 42.5 GHz, Stopband Frequency 48 to 52.5 GHz, 3 dB Cutoff Frequency 43 GHz, Insertion Loss 2 dB, Rejection 25 to 50 dB. Tags: Module with Connector. More details for FLP-4300 can be seen below.