The AE21000SSL1027 from Anatech Electronics is a Low Pass RF Filter with Frequency DC to 21 GHz, 3 dB Cutoff Frequency 21 GHz, Insertion Loss 1 to 3 dB, Rejection 50 dB, Power 15 W. Tags: Module with Connector, Stripline. More details for AE21000SSL1027 can be seen below.