The AE3800L9172 from Anatech Electronics is a Low Pass RF Filter with Frequency 2.3 to 3.8 GHz, Insertion Loss 1.25 dB, Rejection 3 to 60 dB, Return Loss 14 dB, Operating_Temperature -40 to 70 Degree C. Tags: Drop-In. More details for AE3800L9172 can be seen below.