The EMA4D1643P34E24B from ECHO Microwave is a Band Pass Filter with Frequency 1.63 to 1.66 GHz, Insertion Loss 2.2 dB, Rejection 24 to 30 dB, Return Loss 14 dB. Tags: Surface Mount, Ceramic, Ceramic Filter. More details for EMA4D1643P34E24B can be seen below.