Hermetically sealed structure for junction of two waveguides
AssigneeNEC Corporation
InventorKeiichi Umezu
Life of this patent
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Abstract
A first circular waveguide or an elliptical waveguide has an inner circumferential surface tapered such that its inside dimension is gradually reduced continuously toward an end thereof. The elliptical waveguide comprises an antenna waveguide connected to an antenna device. Another circular waveguide has an end joined to the end of the first circular waveguide or the elliptical waveguide. Both waveguides have different inside dimensions at the joined ends. A hermetic seal is sandwiched between the joined ends of both the waveguides. The tapered inner circumferential surface is effective to cancel out a susceptance produced by the hermetic seal. The first waveguide with the tapered inner circumferential surface can easily be manufactured by die casting.
Claims4
A hermetically sealed structure for a junction of two circular waveguides, in which a hermetic seal is sandwiched between the ends of said two circular waveguides, comprising:
- a first circular waveguide having an inside diameter gradually reduced continuously toward an end thereof which is to be joined to an end of a second circular waveguide;
- a second circular waveguide having an end joined to said end of said first circular waveguide;
- and
- said first circular waveguide and said second circular waveguide having different inside diameters at the ends which are to be joined through said hermetic seal.
A hermetically sealed structure for a junction of an elliptical waveguide and a circular waveguide, in which a hermetic seal is sandwiched between the ends of said elliptical waveguide and said circular waveguide, comprising:
- an elliptical waveguide having an inside dimension gradually reduced continuously, keeping the similarity of the shapes, toward an end thereof which is to be joined to an end of a circular waveguide;
- a circular waveguide having an end joined to said end of said elliptical waveguide;
- and
- said elliptical waveguide and said circular waveguide having different inside dimensions at the ends which are to be joined through said hermetic seal.
Dependencies are inferred from the claim text.