The RF3603D from Murata is a Band Pass Filter with Frequency 303.4 to 329.4 MHz, Bandwidth 13 MHz, Center Frequency 316.4 MHz, Insertion Loss 1.8 to 2.2 dB, Power 0.031 W. Tags: Surface Mount, Ceramic, Surface Mount, RF SAW Filter, Ceramic Filter. More details for RF3603D can be seen below.