The AE897NS2172 from Anatech Electronics is a Band Stop Filter with Stopband Frequency 882.6 to 912.4 MHz, Bandwidth 19 MHz, Insertion Loss 2 dB, Rejection 40 dB, VSWR 1.50:1. Tags: Module with Connectors, Cavity Filter, Notch Filter. More details for AE897NS2172 can be seen below.