The ECA1677P4G45A from ECHO Microwave is a Band Pass Filter with Frequency 1.675 to 1.679 GHz, Insertion Loss 3.5 dB, Rejection 45 dB @ DC to 1668MHz, Ripple 1.2 dB, Return Loss 20 dB. Tags: Cavity Filter. More details for ECA1677P4G45A can be seen below.