The EMA8H1643P34F25D from ECHO Microwave is a Band Pass Filter with Frequency 1.63 to 1.66 GHz, Insertion Loss 3 dB, Rejection 25 to 40 dB, Return Loss 15 dB. Tags: Surface Mount, Ceramic, Ceramic Filter. More details for EMA8H1643P34F25D can be seen below.