The Millitech brand HPC Series high power circulators support critical millimeter-wave radar and communication bands. At K-band frequency and above, the circulators are able to provide protection, isolation, and duplex capability to high power transmitters and receivers. They are able to withstand 200W of continuous wave RF power, with peaks power ratings near 2 kW. Other features include an insertion loss below 1 dB up to 40 GHz and less than 2 dB up to 110 GHz, isolations of at least 18 dB in all bands from 18 GHz to 110 GHz, and port-to-port isolation greater than 26 dB available for some configurations. VSWR ratings of 1.3:1, or less, are typical in all frequency bands, with some configurations providing less than 1.1:1 VSWR.