Hollow-waveguide-to-planar-waveguide transition circuit comprising a coupling conductor disposed over slots in a ground conductor
First Claim
1. A hollow-waveguide-to-planar-waveguide transition circuit for transmitting a high-frequency signal, the hollow-waveguide-to-planar-waveguide transition circuit comprising:
- a dielectric substrate having a first main surface and a second main surface which face each other in a thickness direction of the dielectric substrate;
one or more strip conductors formed on the first main surface, extending in a first in-plane direction;
a ground conductor formed on the second main surface to face the one or more strip conductors in the thickness direction;
a slot formed in the ground conductor and extending in a second in-plane direction different from the first in-plane direction on the second main surface; and
a coupling conductor formed at a position to be electrically coupled with the one or more strip conductors on the first main surface, and disposed at a position facing the slot in the thickness direction,the coupling conductor having a main body portion electrically coupled with the one or more strip conductors, and having a protruding portion protruding from the main body portion in the second in-plane direction, the protruding portion being formed and facing, in the thickness direction, an end portion of the one or more slots in the second in-plane direction,wherein the protruding portion has a stair shape in which a width of the protruding portion in the first in-plane direction changes in a manner that stepwise decreases the width of the protruding portion as a location of the width of the protruding portion changes from the main body portion toward the tip of the protruding portion, andthe slot in the ground conductor has a width in the first in-plane direction larger than the width of the protruding portion at a tip of the protruding portion.
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Accused Products
Abstract
A hollow-waveguide-to-planar-waveguide transition circuit includes: strip conductors formed on a first main surface of a dielectric substrate; a ground conductor formed on the back side, facing the strip conductors; a slot formed in the ground conductor; and a coupling conductor formed at a position to be electrically coupled with the strip conductors. The coupling conductor has: a main body portion electrically coupled with the strip conductors; and protruding portions protruding from the main body portion. The protruding portions are formed so as to face an end portion of the slot.
4 Citations
10 Claims
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1. A hollow-waveguide-to-planar-waveguide transition circuit for transmitting a high-frequency signal, the hollow-waveguide-to-planar-waveguide transition circuit comprising:
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a dielectric substrate having a first main surface and a second main surface which face each other in a thickness direction of the dielectric substrate; one or more strip conductors formed on the first main surface, extending in a first in-plane direction; a ground conductor formed on the second main surface to face the one or more strip conductors in the thickness direction; a slot formed in the ground conductor and extending in a second in-plane direction different from the first in-plane direction on the second main surface; and a coupling conductor formed at a position to be electrically coupled with the one or more strip conductors on the first main surface, and disposed at a position facing the slot in the thickness direction, the coupling conductor having a main body portion electrically coupled with the one or more strip conductors, and having a protruding portion protruding from the main body portion in the second in-plane direction, the protruding portion being formed and facing, in the thickness direction, an end portion of the one or more slots in the second in-plane direction, wherein the protruding portion has a stair shape in which a width of the protruding portion in the first in-plane direction changes in a manner that stepwise decreases the width of the protruding portion as a location of the width of the protruding portion changes from the main body portion toward the tip of the protruding portion, and the slot in the ground conductor has a width in the first in-plane direction larger than the width of the protruding portion at a tip of the protruding portion. - View Dependent Claims (5, 6, 7, 8, 9, 10)
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2. A hollow-waveguide-to-planar-waveguide transition circuit for transmitting a high-frequency signal, the hollow-waveguide-to-planar-waveguide transition circuit comprising:
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a dielectric substrate having a first main surface and a second main surface which face each other in a thickness direction of the dielectric substrate; one or more strip conductors formed on the first main surface, extending in a first in-plane direction; a ground conductor formed on the second main surface to face the one or more strip conductors in the thickness direction; one or more slots formed in the ground conductor and extending in a second in-plane direction different from the first in-plane direction on the second main surface; and a coupling conductor formed at a position to be electrically coupled with the one or more strip conductors on the first main surface, and disposed at a position facing the one or more slots in the thickness direction, the coupling conductor having a main body portion electrically coupled with the one or more strip conductors, and having a protruding portion protruding from the main body portion in the second in-plane direction, the protruding portion being formed and facing, in the thickness direction, an end portion of the one or more slots in the second in-plane direction, wherein; a tip of the protruding portion is disposed outside the end portion of the one or more slots in the second in-plane direction as viewed from the thickness direction; and a width of the tip of the protruding portion in the first in-plane direction is narrower than an entire width of the one or more slots in the first in-plane direction.
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3. A hollow-waveguide-to-planar-waveguide transition circuit for transmitting a high-frequency signal, the hollow-waveguide-to-planar-waveguide transition circuit comprising:
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a dielectric substrate having a first main surface and a second main surface which face each other in a thickness direction of the dielectric substrate; one or more strip conductors formed on the first main surface, extending in a first in-plane direction; a ground conductor formed on the second main surface to face the one or more strip conductors in the thickness direction; one or more slots formed in the ground conductor and extending in a second in-plane direction different from the first in-plane direction on the second main surface; and a coupling conductor formed at a position to be electrically coupled with the one or more strip conductors on the first main surface, and disposed at a position facing the one or more slots in the thickness direction, the coupling conductor having a main body portion electrically coupled with the one or more strip conductors, and having a protruding portion protruding from the main body portion in the second in-plane direction, the protruding portion being formed and facing, in the thickness direction, an end portion of the one or more slots in the second in-plane direction, wherein the protruding portion has a tapered shape in which a width of the protruding portion in the first in-plane direction changes in a manner that gradually decreases the width of the protruding portion as a location of the width of the protruding portion changes from the main body portion toward a tip of the protruding portion.
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4. A hollow-waveguide-to-planar-waveguide transition circuit for transmitting a high-frequency signal, the hollow-waveguide-to-planar-waveguide transition circuit comprising:
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a dielectric substrate having a first main surface and a second main surface which face each other in a thickness direction of the dielectric substrate; one or more strip conductors formed on the first main surface, extending in a first in-plane direction; a ground conductor formed on the second main surface to face the one or more strip conductors in the thickness direction; one or more slots formed in the ground conductor and extending in a second in-plane direction different from the first in-plane direction on the second main surface; and a coupling conductor formed at a position to be electrically coupled with the one or more strip conductors on the first main surface, and disposed at a position facing the one or more slots in the thickness direction, the coupling conductor having a main body portion electrically coupled with the one or more strip conductors, and having a protruding portion protruding from the main body portion in the second in-plane direction, the protruding portion being formed and facing, in the thickness direction, an end portion of the one or more slots in the second in-plane direction, wherein a distance in the second in-plane direction between an edge of the end portion of the one or more slots and a tip of the protruding portion is equal to or less than one eighth of a wavelength corresponding to a center frequency of a predetermined frequency band for use in the high-frequency signal.
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Specification