The SF2321D from Murata is a Band Pass Filter with Frequency 1.06 to 1.12 GHz, Bandwidth 30 MHz, Center Frequency 1090 MHz, Insertion Loss 2.4 to 3 dB, Power 0.1 W. Tags: Surface Mount, Ceramic, Surface Mount, RF SAW Filter, Ceramic Filter. More details for SF2321D can be seen below.