The EMA4D1986P20G40D from ECHO Microwave is a Band Pass Filter with Frequency 1.98 to 2 GHz, Insertion Loss 3.5 dB, Rejection 40 dB @ 1926MHz, Return Loss 15 dB. Tags: Surface Mount, Ceramic, Ceramic Filter. More details for EMA4D1986P20G40D can be seen below.