The ECA12820P50D90A from ECHO Microwave is a Band Pass Filter with Frequency 12.8 to 12.85 GHz, Insertion Loss 1.8 dB, Rejection 90 dB @ 12580MHz, Ripple 0.8 dB, Return Loss 18 dB. Tags: Cavity Filter. More details for ECA12820P50D90A can be seen below.