The AE1850B6731 from Anatech Electronics is a Band Pass Filter with Frequency 1.67 to 2.03 GHz, Bandwidth 360 MHz, Center Frequency 1850 MHz, Insertion Loss 1.5 dB, Upper Rejection 60 dB 2230 to 4000 MHz. Tags: Surface Mount, Lumped Component Filter. More details for AE1850B6731 can be seen below.