The EMA4H3300P400F50D from ECHO Microwave is a Band Pass Filter with Frequency 3.1 to 3.5 GHz, Insertion Loss 3 dB, Rejection 50 dB @ 2800 MHz, Return Loss 12 dB. Tags: Surface Mount, Ceramic, Ceramic Filter. More details for EMA4H3300P400F50D can be seen below.