Microwave, millimeter wave and sub-millimeter wave free-space Faraday rotators

We report new loss and dispersive measurements on SrM hexagonal ferrites both in sintered form and in a plastic matrix showing their potential for providing high performance, free-space Faraday Rotators over large frequency ranges. SrM polycrystalline ferrites show a strong dispersion at frequencies below 150GHz which helps to account for their wideband performance at W-band. These ferrites have the advantage that they operate in their remnant state and require no external magnetic field and can act as isolators over extremely large apertures.<>