Wideband cavity-backed antenna
First Claim
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1. An antenna system, comprising:
- a cavity-backed broadside radiating waveguide, wherein the cavity-backed waveguide is a boxlike structure having a first side and a second side that are parallel to one another, a third side and a fourth side that are parallel to one another, a closed end, and an open end, and wherein the cavity is the interior volume formed by the sides and the closed end of the waveguide;
a center conductor of a coaxial feed protruding through a side wall of the waveguide and into the cavity of the waveguide, wherein the side wall is any of the first, second, third, and fourth sides of the waveguide; and
a radiating disc element having an axis of rotational symmetry substantially perpendicular to the side wall of the waveguide, wherein the radiating disk element is affixed to the center conductor, and wherein a position of the radiating disc element on the center conductor is adjustable.
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Abstract
An antenna system is disclosed that includes a mast, waveguides positioned about the mast, and a feed system positioned external to the mast and between adjacent waveguides, such the feed system can be easily serviced. The waveguides include radiator elements that are easy to manufacture, and thus reduce the cost associated with wideband cavity-backed antennas. Further, adjustable disc-like and spherical radiating elements for exciting the fields in the waveguides are also disclosed. DC voltage buildup on the radiating elements are grounded by an easily attachable coaxial structure.
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Citations
9 Claims
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1. An antenna system, comprising:
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a cavity-backed broadside radiating waveguide, wherein the cavity-backed waveguide is a boxlike structure having a first side and a second side that are parallel to one another, a third side and a fourth side that are parallel to one another, a closed end, and an open end, and wherein the cavity is the interior volume formed by the sides and the closed end of the waveguide; a center conductor of a coaxial feed protruding through a side wall of the waveguide and into the cavity of the waveguide, wherein the side wall is any of the first, second, third, and fourth sides of the waveguide; and a radiating disc element having an axis of rotational symmetry substantially perpendicular to the side wall of the waveguide, wherein the radiating disk element is affixed to the center conductor, and wherein a position of the radiating disc element on the center conductor is adjustable. - View Dependent Claims (2, 3, 4, 5, 6)
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7. An antenna system, comprising:
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an antenna support tower; an antenna mast attached to the tower; a cavity-backed broadside radiating waveguide attached to the mast, wherein the cavity-backed waveguide is a boxlike structure having a first side and a second side that are parallel to one another, a third side and a fourth side that are parallel to one another, a closed end, and an open end, and wherein the cavity is the interior volume formed by the sides and the closed end of the waveguide; a center conductor of a coaxial feed protruding through a side wall of the waveguide and into the cavity of the waveguide, wherein the side wall is any of the first, second, third, and fourth sides of the waveguide; and a radiating disc element having an axis of rotational symmetry substantially perpendicular to the side wall of the waveguide, wherein the radiating disk element is affixed to the center conductor, and wherein a position of the radiating disc element on the center conductor is adjustable.
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8. A method for exciting a cavity-backed broadside radiating waveguide, comprising the steps of:
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placing a center conductor of a coaxial feed through a side wall aperture of the waveguide; attaching a radiating disc element to the center conductor; adjusting a position of the radiating disc element on the center conductor to enable proper excitation of radiating fields; and energizing the radiating disc element with a time-harmonic electrical signal. - View Dependent Claims (9)
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Specification