The ECA20500P100D50A from ECHO Microwave is a Band Pass Filter with Frequency 20.45 to 20.55 GHz, Insertion Loss 2 dB, Rejection 50 dB @ DC to 18500MHz, Ripple 0.5 dB, Return Loss 16 dB. Tags: Cavity Filter. More details for ECA20500P100D50A can be seen below.