Method and apparatus for reducing unwanted r.f. signal antenna reception/transmission
First Claim
1. A method of reducing r.f. signal reception/transmission via the radiation pattern side lobes of a two-dimensional r.f. antenna array structure having plural radiator elements and a radiating aperture of predetermined size and shape defined by a subset of said radiator elements and having a three-dimensional radiation pattern which includes a primary lobe with a principal axis extending away from said array and at least one secondary or side lobe which side lobe is not rotationally symmetric about the principal axis of the primary lobe, said method comprising the step of:
- rotating the orientation of said radiation pattern about the principal axis of said primary lobe by rotating said aperture while maintaining constant its said predetermined size and shape but while also selecting different ones of said radiating elements to be within said subset or said radiator elements that is active for r.f. signal reception/transmission.
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Accused Products
Abstract
A method and apparatus is disclosed for selectively modulating r.f. signals received/transmitted via the radiation pattern side lobes of an r.f. antenna structure. Such modulation permits discrimination between desired r.f. signal energy received via the primary radiation pattern lobe and unwanted r.f. radiation (e.g. noise, jamming or other interference signals) received/transmitted via the secondary or side lobe(s) of the radiation pattern.
39 Citations
16 Claims
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1. A method of reducing r.f. signal reception/transmission via the radiation pattern side lobes of a two-dimensional r.f. antenna array structure having plural radiator elements and a radiating aperture of predetermined size and shape defined by a subset of said radiator elements and having a three-dimensional radiation pattern which includes a primary lobe with a principal axis extending away from said array and at least one secondary or side lobe which side lobe is not rotationally symmetric about the principal axis of the primary lobe, said method comprising the step of:
rotating the orientation of said radiation pattern about the principal axis of said primary lobe by rotating said aperture while maintaining constant its said predetermined size and shape but while also selecting different ones of said radiating elements to be within said subset or said radiator elements that is active for r.f. signal reception/transmission. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. Apparatus for reducing unwanted r.f. signal reception/transmission via an r.f. antenna structure, said apparatus comprising:
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a two-dimensional antenna array structure including a plural radiators and a radiating aperture of predetermined size and shape defined by a subset of said radiators and having a radiation pattern which includes a primary lobe and at least one secondary lobe or side lobe, and pattern modification means associated with said antenna structure for causing said secondary lobe to be rotated relative primary lobe whereby r.f. signals received/transmitted via the secondary lobe are modulated and made distinguishable from those received/transmitted via the primary lobe by rotating said radiating aperture while maintaining constant said predetermined size and shape but while also selecting different ones of said radiators to be within said subsets that is active for r.f. signal reception/transmission. - View Dependent Claims (13, 14, 15, 16)
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Specification