The EDA4F3840P120F40 from ECHO Microwave is a Band Pass Filter with Frequency 3.78 to 3.9 GHz, Insertion Loss 3 dB, Rejection 40 dB @ 3590MHz, Return Loss 15 dB. Tags: Surface Mount, Ceramic, Ceramic Filter. More details for EDA4F3840P120F40 can be seen below.