The EMA8J1850P300D40DL from ECHO Microwave is a Band Pass Filter with Frequency 1.7 to 2 GHz, Insertion Loss 2 dB, Rejection 35 to 65 dB, Return Loss 15 dB. Tags: Surface Mount, Ceramic, Ceramic Filter. More details for EMA8J1850P300D40DL can be seen below.