The SiMF27R45/3R1-5W1 from Sainty-Tech Communications Limited is a Band Pass Filter with Frequency 25.9 to 29 GHz, Center Frequency 27.45 GHz, Insertion Loss 0.9 dB, Rejection 30 dB @23.6GHz&30.84GHz, 40 dB @20.85GHz&31.3GHz, 60 dB @DC~7.04GHz, 60 dB @36.6~39.2GHz, Upper Rejection 30 to 60 dB. Tags: Surface Mount, Cavity Filter. More details for SiMF27R45/3R1-5W1 can be seen below.