The EMA4D1842P7G21D from ECHO Microwave is a Band Pass Filter with Frequency 1.84 to 1.85 GHz, Insertion Loss 3.5 dB, Rejection 21 to 40 dB, Return Loss 15 dB. Tags: Surface Mount, Ceramic, Ceramic Filter. More details for EMA4D1842P7G21D can be seen below.