The ECCA-D1588F1236F920A60B-P350-3RU from ECHO Microwave is a Band Pass Filter with Frequency 0.93 to 1.61 GHz, Insertion Loss 0.5 dB, Rejection 40 to 60 dB, Ripple 0.3 dB, Return Loss 18 dB. Tags: Cavity Filter. More details for ECCA-D1588F1236F920A60B-P350-3RU can be seen below.