The AM1621B1338 from Anatech Electronics is a Band Pass Filter with Frequency 1.61 to 1.62 GHz, Bandwidth 10.5 MHz, Center Frequency 1621 MHz, Insertion Loss 2 dB, Upper Rejection 55 dB @ 2483.5-2690 MHz. Tags: Ceramic, Surface Mount, Ceramic Filter. More details for AM1621B1338 can be seen below.