The SiMS22/R4-6S4 from Sainty-Tech Communications Limited is a Band Pass Filter with Frequency 21.8 to 22.2 GHz, Center Frequency 22 GHz, Insertion Loss 4 dB, Rejection 30 dB @21.2GHz&23GHz, 40 dB @21GHz&23.2GHz, 50 dB @DC~15GHz, 40 dB @24~29GHz, Upper Rejection 30 to 40 dB. Tags: Surface Mount, Cavity Filter. More details for SiMS22/R4-6S4 can be seen below.