Directional coupler and microwave heater provided with the same
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United States of America Patent
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Nov 20, 2018
Grant Date -
Aug 27, 2015
app pub date -
Jan 31, 2014
filing date -
Jan 31, 2013
priority date (Note) -
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Abstract
A directional coupler according to the invention includes an opening in a wall surface of a waveguide, and a coupling line on an outer side of the waveguide. The opening is configured to not cross a tube axis of the waveguide in plan view, and to emit a circularly polarized wave. The coupling line includes first and second transmission lines and output parts disposed at both ends, the first and second transmission lines extending across the opening to cross the tube axis in plan view and being opposed to each other across the center of the opening. The first and second transmission lines are interconnected at a position displaced from an area vertically above the opening.
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