The EMA6F1800P50E35D from ECHO Microwave is a Band Pass Filter with Frequency 1.78 to 1.83 GHz, Insertion Loss 2.5 dB, Rejection 30 to 50 dB, Return Loss 15 dB. Tags: Surface Mount, Ceramic, Ceramic Filter. More details for EMA6F1800P50E35D can be seen below.