Method for conversion of waveguide modes, mode-converting...

Wave transmission lines and networks – Wave mode converters

Reexamination Certificate

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C333S251000

Reexamination Certificate

active

10535236

ABSTRACT:
The invention relates to a method for conversion of waveguide modes from a mode of type TM01to mode of type TE11for 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 TE11and a waveguide-mode-converting section (2-5) arranged between the incoming and outgoing waveguides. According to the invention, incoming power of mode type TM01is 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.

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Robert L. Eisenhart; A Novel Wideband TMO1-to-TE11 Mode Converter; 1998 IEEE MTT-S Digest; pp. 249-252; AN: 5985784; vol. 1.
Shiwen Yang and Hongfu Li; Optimization of Novel High-Power Millimeter-Wave TM01-TE11Mode Converters; IEEE Transactions on Microwave Theory and Techniques; Apr. 1997; pp. 552-554, AN: 5561877 vol. 45, No. 4.
G. Janzen; Mode Converters from TE0mto TEm0for High-Power Applications in the Frequency Range 1 to 30 GHz; Int. J. Electronics; 1984; pp. 1219-1224, AN: 2531643; vol. 57, No. 6.
Constantine A. Balanis; Circular Cross-Section Waveguides and Cavities; Advanced Engineering Electromagnetics; pp. 470-495; Chapter 9; John Wiley & Sons.

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