TF-04-S1 SAGE Millimeter, Inc. model STF-04-S1 is a full band Faraday isolator that operates from 170 to 260 GHz. The Faraday isolator is constructed with a longitudinal, magnetized ferrite rod that causes a Faraday rotation of the incoming RF signal.

The Faraday isolator offers 30 dB typical isolation and 4.0 dB nominal insertion loss with good flatness. The return loss of the isolator is 15 dB. The input and output ports are WR-04 waveguides with UG-387/U-M flanges.