The AE1950NS2177 from Anatech Electronics is a Band Stop Filter with Stopband Frequency 1.92 to 1.97 GHz, Bandwidth 31 MHz, Insertion Loss 2 dB, Rejection 40 dB, VSWR 1.50:1. Tags: Module with Connectors, Cavity Filter, Notch Filter. More details for AE1950NS2177 can be seen below.