Patent ID: 7986201
Filing Date: 2011-07-26
Classification: H01P

Abstract:
1. A microwave waveguide, comprising: at least one body supporting at least one active wall of predetermined geometric shape, the at least one body has, near the at least one active wall, a coating layer made of an electrically conducting material comprising a metal selected from gold, silver, copper, and aluminum, the at least one body, or the parts assembled to form the at least one body, are produced from a ceramic selected from the following: silicon carbide, aluminum nitride, boron nitride, and 3C cubic and 2H hexagonal varieties of boron nitride, diamond, beryllium oxide, solid solutions of said materials or assemblies thereof, the at least one body has, near the active wall, one or more intermediate layers inserted between the coating layer and the ceramic, the one or more intermediate layers having a first side and a second opposing side, the first side being in direct contact with the ceramic body and the second side being in direct contact with the coating layer; the intermediate layer or layers are made of a metal selected from the following metals: aluminum, titanium, zirconium, hafnium, vanadium, niobium, tantalum, chrome, molybedenum, and tungsten, or are produced in an alloy of these metals, or a carbide, silicide, nitride or boride compound of one or more of the metals, a metal, semiconductor or insulator compound, or a ternary, quaternary or multiple solid solution of said compounds, wherein the intermediate layer or layers directly in contact with the ceramic body are configured to promote tying to the ceramic body; and wherein at least one of the intermediate layers is a diffusion barrier for preventing chemical reaction between the coating of electrically conducting material and the ceramic body.