The SiMS29/4-5W2 from Sainty-Tech Communications Limited is a Band Pass Filter with Frequency 27.1 to 31.2 GHz, Center Frequency 29 GHz, Insertion Loss 1.4 dB, Rejection 30 dB @24.74GHz, 40 dB @23.8GHz, 60 dB @DC~5.6GHz, 25 dB @34~42GHz, Upper Rejection 25 to 40 dB. Tags: Surface Mount, Cavity Filter. More details for SiMS29/4-5W2 can be seen below.