The AE4300NS2146 from Anatech Electronics is a Band Stop Filter with Stopband Frequency 4.2 to 4.3 GHz, Bandwidth 40 MHz, Insertion Loss 1.5 dB, Power 10 W, VSWR 2.00:1. Tags: Module with Connectors, Cavity Filter, Notch Filter. More details for AE4300NS2146 can be seen below.