The EMA8J1643P34F40D from ECHO Microwave is a Band Pass Filter with Frequency 1.63 to 1.66 GHz, Insertion Loss 3 dB, Rejection 70 dBmax.@40dB, Return Loss 12 dB. Tags: Surface Mount, Ceramic, Ceramic Filter. More details for EMA8J1643P34F40D can be seen below.