The QLF-18000-50-1 from Qualwave is a Low Pass RF Filter with Frequency DC to 18 GHz, Stopband Frequency 18.8 to 19.5 GHz, Insertion Loss 2 dB, Upper Rejection 50 dB @ 18.8 to 19.5GHZ, VSWR 2.00:1. Tags: Module with Connector. More details for QLF-18000-50-1 can be seen below.