The L117XH4W from Knowles is a Low Pass RF Filter with Frequency DC to 11 GHz, Stopband Frequency 17.6 to 27.8 GHz, 3 dB Cutoff Frequency 11.7 GHz, Insertion Loss 3 dB, Rejection 40 dB. Tags: Surface Mount, Ceramic Filter. More details for L117XH4W can be seen below.