guide devices for electromagnetic waves and method of manufacturing such guide devices

The invention relates to electromagnetic waves for guiding devices or guides (f <10 THz), and methods of making these guides comprise at least one body (30) supporting at least one active wall (40) .The body ( 30) of the guide is formed from a volume of a ceramic material selected from: carbides of silicon, aluminum nitride, boron nitrides and varieties including cubic 3C and 2H of hexagonal boron nitride, diamond, beryllium oxide, or assemblies of said materiaux.Applications: waveguides, filter cavities, reflectors and antennae for radio-frequency waves and microwaves, atomic clocks, particle accelerators.