The EMA4D1618P20D5B from ECHO Microwave is a Band Pass Filter with Frequency 1.61 to 1.63 GHz, Insertion Loss 1.7 dB, Rejection 5 dB @ 1578 MHz, Return Loss 15 dB. Tags: Surface Mount, Ceramic, Ceramic Filter. More details for EMA4D1618P20D5B can be seen below.