The ECA1677P4F45A-DR from ECHO Microwave is a Band Pass Filter with Frequency 1.67 to 1.67 GHz, Insertion Loss 3 dB, Rejection 45 dB @ DC to 1668MHz, Ripple 3 dB, Return Loss 20 dB. Tags: Cavity Filter. More details for ECA1677P4F45A-DR can be seen below.