The AM2140B178 from Anatech Electronics is a Band Pass Filter with Frequency 2.1 to 2.18 GHz, Bandwidth 80 MHz, Center Frequency 2140 MHz, Insertion Loss 2.4 dB, Rejection 15 to 30 dB. Tags: Surface Mount, Ceramic, Ceramic Filter. More details for AM2140B178 can be seen below.