The EMA4H3300P400J50DL from ECHO Microwave is a Band Pass Filter with Frequency 3.1 to 3.5 GHz, Insertion Loss 5 dB, Rejection 50 dB @ 2800MHz, Return Loss 12 dB. Tags: Surface Mount, Ceramic, Ceramic Filter. More details for EMA4H3300P400J50DL can be seen below.