Method for conversion of waveguide modes, mode-converting arrangement and antenna arrangement

摘要

The invention relates to a method for conversion of waveguide modes from a mode of type TM₀₁ to mode of type TE₁₁ for transmission of power within the microwave range. The invention also relates to a mode-converting arrangement and an antenna arrangement with such a mode converting arrangement. The mode-converting arrangement comprises an incoming waveguide ( 1 ) for reception of power of the type TM₀₁-an outgoing waveguide ( 6 ) for outputting power of mode type TE₁₁ and a waveguide-mode-converting section ( 2 - 5 ) arranged between the incoming and outgoing waveguides. According to the invention, incoming power of mode type TM₀₁ is divided in an input section ( 2 ) between two or more waveguides with cross-sections in the shape of circle sectors. Thereafter, the divided power is phase-shifted by the waveguides in a subsequent phase-shift section ( 4 ) being designed with cross-sections that are essentially in the shape of circle sectors with different radii, after which the waveguides are changed into a common essentially circular waveguide ( 6 ) that emits an outgoing power of mode type TE₁₁. By means of the invention, a relatively simple solution is produced that can cope with high powers.