The EMA6J1643P34F50B from ECHO Microwave is a Band Pass Filter with Frequency 1.63 to 1.66 GHz, Insertion Loss 3 dB, Rejection 50 dB @ 1558.5 MHz, Return Loss 13 dB. Tags: Surface Mount, Ceramic, Ceramic Filter. More details for EMA6J1643P34F50B can be seen below.