The SiMS28/2R2-8D3 from Sainty-Tech Communications Limited is a Band Pass Filter with Frequency 26.45 to 29.5 GHz, Center Frequency 28 GHz, Insertion Loss 2.6 dB, Rejection 30 dB @25GHz&30.9GHz, 40 dB @23.5&32.5GHz, 60 dB @DC~9.15GHz, Upper Rejection 30 to 40 dB. Tags: Surface Mount, Cavity Filter. More details for SiMS28/2R2-8D3 can be seen below.