The EMA8J1825P20H50D from ECHO Microwave is a Band Pass Filter with Frequency 1.81 to 1.85 GHz, Insertion Loss 4 dB, Rejection 50 dB @ 1785 MHz, Return Loss 12 dB. Tags: Surface Mount, Ceramic, Ceramic Filter. More details for EMA8J1825P20H50D can be seen below.