The SF2017D from Murata is a Band Pass Filter with Frequency 1.21 to 1.23 GHz, Bandwidth 8 MHz, Center Frequency 1220 MHz, Insertion Loss 3.2 to 5.3 dB, Operating_Temperature -40 to 85 Degree C. Tags: Surface Mount, Ceramic, Surface Mount, Ceramic Filter. More details for SF2017D can be seen below.