The SF2173E from Murata is a Band Pass Filter with Frequency 2.3 to 2.4 GHz, Bandwidth 50 MHz, Center Frequency 2350 MHz, Insertion Loss 3 to 3.5 dB, Power 0.01 W. Tags: Surface Mount, Ceramic, Surface Mount, RF SAW Filter, Ceramic Filter. More details for SF2173E can be seen below.