The ATEK839P3 from ATEK MIDAS is a Low Pass RF Filter with Frequency DC to 0.55 GHz, Stopband Frequency 0.95 to 1.9 GHz, Insertion Loss 0.8 to 1.8 dB, Upper Rejection 40 to 49 dB@ 0.95 GHz, 1.5 GHz, 1.9 GHz, Return Loss -22 to -20 dB. Tags: Surface Mount. More details for ATEK839P3 can be seen below.