The ECA4500P10F40A from ECHO Microwave is a Band Pass Filter with Frequency 4.49 to 4.51 GHz, Insertion Loss 3 dB, Rejection 40 dB @ 4480&4520MHz, Ripple 1.5 dB, Return Loss 20 dB. Tags: Cavity Filter. More details for ECA4500P10F40A can be seen below.