Radiometer Physics : RPG-Radiometer Physics GmbH - one of the leading suppliers for remote sensing, millimeter wave,
  sub-mm and THz instrumentation and components - RPG Radiometer Physics GmbH (radiometer-physics.de)

  SAGE Millimeter : Eravant Millimeter Wave Products & Components | 26.5 to 325 GHz | Formerly SAGE Millimeter.