US 4,246,584 A · Hybrid mode waveguide or feedhorn antenna

Abstract

The present invention relates to a hybrid mode waveguide or feedhorn antenna for transforming the TE.sub.11 mode into the HE.sub.11 mode. The waveguide or antenna comprises a first waveguide section of uniform cross-section at the TE.sub.11 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 TE.sub.11 mode entrance port and in the remainder of the helical projection, the same or decreasing gauge wire in adjacent portions can be used.

Claims7

Dependent claims

A hybrid mode wavelength capable of converting a TE.sub.11 mode signal entering at one port of the waveguide into a HE.sub.11 mode signal comprising:

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 TE.sub.11 mode entrance port of the waveguide.

1 more element

A hybrid mode feedhorn antenna comprising:

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 TE.sub.11 mode signal into a HE.sub.11 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.

1 more element

Dependencies are inferred from the claim text.

Hybrid mode waveguide or feedhorn antenna

Life of this patent

Hybrid mode waveguide or feedhorn antenna

Life of this patent

Abstract

Claims7