The AE2140NS2178 from Anatech Electronics is a Band Stop Filter with Stopband Frequency 2.11 to 2.17 GHz, Bandwidth 35 MHz, Insertion Loss 2 dB, Rejection 40 dB, VSWR 1.50:1. Tags: Module with Connectors, Cavity Filter, Notch Filter. More details for AE2140NS2178 can be seen below.