The SiMF34R4/2-5W2 from Sainty-Tech Communications Limited is a Band Pass Filter with Frequency 33.5 to 35.9 GHz, Center Frequency 34.4 GHz, Insertion Loss 2 dB, Rejection 30 dB @31.2GHz&39.5GHz, 50 dB @DC~29GHz, Upper Rejection 30 dB. Tags: Surface Mount, Cavity Filter. More details for SiMF34R4/2-5W2 can be seen below.