The AE11500SSL1053 from Anatech Electronics is a Low Pass RF Filter with Frequency DC to 11.5 GHz, 3 dB Cutoff Frequency 11.5 GHz, Insertion Loss 1 to 1.5 dB, Rejection 50 dB, Power 15 W. Tags: Module with Connector, Stripline. More details for AE11500SSL1053 can be seen below.