The FLP-3660 from Marki Microwave is a Low Pass RF Filter with Frequency DC to 36.4 GHz, Stopband Frequency 41.5 to 46 GHz, 3 dB Cutoff Frequency 36.6 GHz, Insertion Loss 1.8 dB, Rejection 25 to 50 dB. Tags: Module with Connector. More details for FLP-3660 can be seen below.