The SF2191E from Murata is a Band Pass Filter with Frequency 1.61 to 1.63 GHz, Bandwidth 11.5 MHz, Center Frequency 1621 MHz, Insertion Loss 1.3 to 2.8 dB, Power 0.003 W. Tags: Surface Mount, Ceramic, Surface Mount, RF SAW Filter, Ceramic Filter. More details for SF2191E can be seen below.