Method for conversion of waveguide modes, mode-converting arrangement and antenna arrangement
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United States of America Patent
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Jan 29, 2008
Grant Date -
Jul 13, 2006
app pub date -
Nov 14, 2003
filing date -
Nov 18, 2002
priority date (Note) -
Expired
status (Latency Note)
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Abstract
The invention relates to a method for conversion of waveguide modes from a mode of type TM.sub.01 to mode of type TE.sub.11 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 TM.sub.01-an outgoing waveguide (6) for outputting power of mode type TE.sub.11 and a waveguide-mode-converting section (2-5) arranged between the incoming and outgoing waveguides. According to the invention, incoming power of mode type TM.sub.01 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 TE.sub.11. By means of the invention, a relatively simple solution is produced that can cope with high powers.
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