The EMA8J2900P400D60B from ECHO Microwave is a Band Pass Filter with Frequency 2.7 to 3.1 GHz, Insertion Loss 2 dB, Rejection 60 dB @ Fc-400 MHz, Return Loss 15 dB. Tags: Surface Mount, Ceramic, Ceramic Filter. More details for EMA8J2900P400D60B can be seen below.