The EMA8J1000P50F40D from ECHO Microwave is a Band Pass Filter with Frequency 975 MHz to 1.03 GHz, Insertion Loss 3 dB, Rejection 40 dB @ 950 MHz, Return Loss 15 dB. Tags: Surface Mount, Ceramic, Ceramic Filter. More details for EMA8J1000P50F40D can be seen below.