The EMA3C3700P200C17B from ECHO Microwave is a Band Pass Filter with Frequency 3.6 to 3.8 GHz, Insertion Loss 1.5 dB, Rejection 17 to 35 dB, Return Loss 12 dB. Tags: Surface Mount, Ceramic, Ceramic Filter. More details for EMA3C3700P200C17B can be seen below.