The RSF-2155.000-90000-1109-TR from Raltron is a Band Pass Filter with Frequency 2110 to 2200 MHz, Bandwidth 90 MHz, Center Frequency 2155 MHz, Insertion Loss 2.6 to 3.4 dB, Rejection 62 to 26 dB. Tags: Surface Mount, RF SAW Filter. More details for RSF-2155.000-90000-1109-TR can be seen below.