The AE902NS2173 from Anatech Electronics is a Band Stop Filter with Stopband Frequency 890 to 915 MHz, Insertion Loss 2 dB, Rejection 40 dB, VSWR 1.50:1, Return Loss 14 dB. Tags: Module with Connectors, Cavity Filter, Notch Filter. More details for AE902NS2173 can be seen below.