The AM1090B1023 from Anatech Electronics is a Band Pass Filter with Frequency 1.09 to 1.1 GHz, Bandwidth 10 MHz, Center Frequency 1090 MHz, Insertion Loss 4 dB, Lower Rejection 30 dB @ +/- 35 MHz from Center Frequency. Tags: Ceramic, Surface Mount, Ceramic Filter. More details for AM1090B1023 can be seen below.