The EMA8J2045P250F45D from ECHO Microwave is a Band Pass Filter with Frequency 1.92 to 2.17 GHz, Insertion Loss 3 dB, Rejection 45 dB @ 1710~1880 MHz, Return Loss 15 dB. Tags: Surface Mount, Ceramic, Ceramic Filter. More details for EMA8J2045P250F45D can be seen below.