PT Unknown AU Myasnikova, SE Parshin, VV van't Klooster, K Valsecchi, G TI Reflectivity of antenna and mirrors reflectors at 110 and 200 GHz SE Proc. 4th international conference on antenna theory and techniques PY 2003 BP 624 EP 627 VL 2 DE mirror; reflection index; emissivity; reflectivity; Fabry-Perot interferometer; subterahertz; subTHz AB Reflectivity (reflection loss) investigations of nickel samples with different types of surface finish, with and without rhodium coating, have been carried out in the 110-200 GHz frequency range on an installation developed in the Applied Physics Institute of Russia. The reflectivity measurements of high quality silver coated and gold coated mirrors are also presented. The reflectivity (reflection loss) investigations of some carbon fibre samples with and without aluminium coating have been made. Results are interesting, in view of the anisotropy of the carbon fibre material. ER