The EMA8J1842P75F50D from ECHO Microwave is a Band Pass Filter with Frequency 1.81 to 1.88 GHz, Insertion Loss 3 dB, Rejection 50 dB @ 1710 to 1785 MHz, Return Loss 15 dB. Tags: Surface Mount, Ceramic, Ceramic Filter. More details for EMA8J1842P75F50D can be seen below.