The AE12400L9204 from Anatech Electronics is a Low Pass RF Filter with Frequency DC to 12.4 GHz, Insertion Loss 0.45 dB, Rejection 30 to 60 dB, Power 50 W, VSWR 1.35:1, 1.45:1. Tags: Module with Connector, Lumped Component Filter. More details for AE12400L9204 can be seen below.