The EMA4D1815P70C20B from ECHO Microwave is a Band Pass Filter with Frequency 1.78 to 1.85 GHz, Insertion Loss 1.5 dB, Rejection 20 to 40 dB, Return Loss 15 dB. Tags: Surface Mount, Ceramic, Ceramic Filter. More details for EMA4D1815P70C20B can be seen below.