Slotted cavity antenna
First Claim
Patent Images
1. A crossed slot antenna comprising:
- a resonant cavity having plural intersecting radiating slots formed in one wall thereof,an electrically conductive plate disposed within said cavity and substantially spaced from all internal cavity walls thereby lengthening the effective electrical resonant dimensions of the cavity for a given physical size of cavity, andr.f. feed means electrically connected to at least one point on said plate, substantially removed from its midpoint, for feeding r.f. signals to/from each of said plural slots via said plate with predetermined respectively corresponding relative phase relationships.
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Abstract
A resonant cavity having at least one radiating antenna slot formed in a wall of the cavity includes an electrically conducting plate disposed within the cavity and substantially spaced from all internal cavity walls so as to effectively lengthen the electrical resonant dimensions of the cavity for a given physical size. This slotted cavity antenna permits the use of simplified feeding structures, provides a more efficient antenna structure and reduces the necessary physical dimensions of the structure for operation at a given frequency.
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Citations
37 Claims
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1. A crossed slot antenna comprising:
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a resonant cavity having plural intersecting radiating slots formed in one wall thereof, an electrically conductive plate disposed within said cavity and substantially spaced from all internal cavity walls thereby lengthening the effective electrical resonant dimensions of the cavity for a given physical size of cavity, and r.f. feed means electrically connected to at least one point on said plate, substantially removed from its midpoint, for feeding r.f. signals to/from each of said plural slots via said plate with predetermined respectively corresponding relative phase relationships. - View Dependent Claims (2, 3)
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4. An antenna comprising:
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a resonant cavity having plural radiating slots formed in the surface of one wall thereof, an electrically conducting plate disposed within said cavity and substantially spaced from all internal cavity walls thereby lengthening the effective electrical resonant dimensions of the cavity for a given physical size of cavity, and feed means electrically connected to said plate at one or more points substantially removed from the plate midpoint for coupling radio frequency electrical signals to/from said slots in said resonant cavity and a source/receiver of such signals located externally of the cavity via said plate with predetermined relative phases. - View Dependent Claims (5, 6, 7, 8, 9, 10, 11, 12)
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13. In a crossed slot antenna having two intersection radiating slots formed in one wall of a resonant cavity, the improvement comprising:
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an electrically conducting plate shaped substantially similar to a cross-section of said resonant cavity taken parallel to said one wall, but said plate being smaller than said cross-section in its respective dimensions, said plate being disposed within said cavity and substantially spaced from all internal cavity walls thereby lengthening the effective electrical resonant dimensions of the cavity for a given physical size of cavity, and feed means electrically connected to said plate at one or more points substantially removed from the plate midpont for coupling radio frequency electrical signals to/from said slots in said resonant cavity and a source/receiver of such signals located externally of the cavity via said plate with predetermined respectively corresponding relative phase relationships. - View Dependent Claims (14, 15, 16, 17, 18, 19, 20, 21, 22, 23)
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24. A crossed slot antenna comprising:
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a resonant cavity defined at least in part by first and second spaced-apart opposingly disposed electrically conductive surfaces which are electrically connected together to define the boundaries of said cavity, at least two intersecting radiating slots formed in said first surface, a third electrically conductive surface of lesser dimensions than said first and second surfaces, said third surface being disposed within said resonant cavity and being substantially symmetric in shape and disposition with respect to each of said radiating slots, and feed means electrically connected to said third surface at one or more points substantially removed from the midpoint of said third surface for coupling radio frequency electrical signals to/from said slots in said resonant cavity and a source/receiver of such signals located externally of the cavity via said plate with predetermined respectively corresponding relative phase relationships. - View Dependent Claims (25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37)
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Specification