Hybrid mode waveguide or feedhorn antenna
First Claim
1. A hybrid mode wavelength capable of converting a TE11 mode signal entering at one port of the waveguide into a HE11 mode signal comprising:
- a hollow waveguide body (48) comprising an inner surfacecharacterized in thatthe waveguide further comprises;
a helically wound wire structure (18) bonded to the inner surface of the waveguide body with a dielectric layer (50), said wire structure comprising a mode conversion section (II-V, FIG.
2) comprising a plurality of subsections formed of a layer of closely-spaced helical turns of dielectrically coated wires with each subsection of said mode conversion section comprising a different cross-sectional sized wire, the wire size between the subsections of the mode conversion section gradually decreasing as the helix progresses away from the TE11 mode entrance port of the waveguide.
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Accused Products
Abstract
The present invention relates to a hybrid mode waveguide or feedhorn antenna for transforming the TE11 mode into the HE11 mode. The waveguide or antenna comprises a first waveguide section of uniform cross-section at the TE11 mode entrance port which in the antenna arrangement changes to a second section which flares outward toward the antenna mouth, and a spiro-helical projection bonded with a dielectric layer to the inner surface of the waveguide or antenna. The spiro-helical projection comprises a closely spaced helically wound wire structure formed of dielectrically coated wires which in the first section decrease in gauge size in small adjacent portions thereof as the helix progresses away from the TE11 mode entrance port and in the remainder of the helical projection, the same or decreasing gauge wire in adjacent portions can be used.
267 Citations
7 Claims
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1. A hybrid mode wavelength capable of converting a TE11 mode signal entering at one port of the waveguide into a HE11 mode signal comprising:
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a hollow waveguide body (48) comprising an inner surface characterized in that the waveguide further comprises; a helically wound wire structure (18) bonded to the inner surface of the waveguide body with a dielectric layer (50), said wire structure comprising a mode conversion section (II-V, FIG.
2) comprising a plurality of subsections formed of a layer of closely-spaced helical turns of dielectrically coated wires with each subsection of said mode conversion section comprising a different cross-sectional sized wire, the wire size between the subsections of the mode conversion section gradually decreasing as the helix progresses away from the TE11 mode entrance port of the waveguide. - View Dependent Claims (2, 3)
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4. A hybrid mode feedhorn antenna comprising:
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a hollow waveguide body (48) including an inner surface and comprising a first section (12) of uniform cross-section which changes into a second section (14) that flares outward from one end of the first section to form a mouth of the feedhorn antenna characterized in that the feedhorn antenna further comprises; a spiro-helical projection (18, FIGS. 1-5) comprising a helically wound wire structure (18) bonded to the inner surface of the waveguide body with a dielectric layer (50), said wire structure comprising a mode convesion section (II-V, FIG.
2) comprising a plurality of subsections capable of converting a TE11 mode signal into a HE11 mode signal formed of a layer of closely-spaced helical turns of dielectrically coated wires with each subsection comprising a different cross-sectional sized wire with the wire size between the subsections of said mode conversion section gradually decreasing as the helix progresses from the other end of the first section towards the second section of the waveguide body, the remaining section (14) of the wire structure comprising closely-spaced helical turns of a dielectrically coated wire of a cross-sectional size no larger than the smallest size wire in said mode conversion section. - View Dependent Claims (5, 6, 7)
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Specification