The ECA1800P130A45A from ECHO Microwave is a Band Pass Filter with Frequency 1.74 to 1.87 GHz, Insertion Loss 0.5 dB, Rejection 45 dB @ 1625MHz, Ripple 0.3 dB, Return Loss 20 dB. Tags: Cavity Filter. More details for ECA1800P130A45A can be seen below.