The QLF-11700-50 from Qualwave is a Low Pass RF Filter with Frequency DC to 11.7 GHz, Stopband Frequency 12.7 to 13.45 GHz, Insertion Loss 2 dB, Upper Rejection 50 dB @ 12.7 to 13.45 GHz, VSWR 1.70:1. Tags: Module with Connector. More details for QLF-11700-50 can be seen below.