The EMA8J1700P50F50D from ECHO Microwave is a Band Pass Filter with Frequency 1.68 to 1.73 GHz, Insertion Loss 3 dB, Rejection 50 to 60 dB, Return Loss 15 dB. Tags: Surface Mount, Ceramic, Ceramic Filter. More details for EMA8J1700P50F50D can be seen below.