We have successfully demonstrated a WR-4.3 isolator covering the full waveguide band from 170-260 GHz with a typical insertion loss near 2 dB.
In addition to this news, we gave a live demonstration of our WR-3.4 isolator at the IMS exhibit in Philadelphia, June 11-14. Yes, the insertion loss really is < 2 dB typical! Many thanks to everyone who stopped by our booth and expressed interest in our products.