The ECA1750P22D65A from ECHO Microwave is a Band Pass Filter with Frequency 1.74 to 1.76 GHz, Insertion Loss 2 dB, Rejection 65 dB @ 1750+/-35MHz, Ripple 1 dB, Return Loss 18 dB. Tags: Cavity Filter. More details for ECA1750P22D65A can be seen below.