The SiMS35/4-5W1 from Sainty-Tech Communications Limited is a Band Pass Filter with Frequency 32.5 to 37 GHz, Center Frequency 35 GHz, Insertion Loss 1.2 dB, Rejection 30 dB @30GHz&42.5GHz, 40 dB @28.4GHz, 45 dB @DC~27GHz, Upper Rejection 30 to 40 dB. Tags: Surface Mount, Cavity Filter. More details for SiMS35/4-5W1 can be seen below.