The EMA4D1643P48F33B from ECHO Microwave is a Band Pass Filter with Frequency 1.63 to 1.68 GHz, Insertion Loss 3 dB, Rejection 8 to 45 dB, Return Loss 12 dB. Tags: Surface Mount, Ceramic, Ceramic Filter. More details for EMA4D1643P48F33B can be seen below.