Microstrip antenna
First Claim
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1. An antenna comprising:
- a plurality of substantially rectangular patches, disposed upon a common substrate, each patch having a pair of parallel first edges of length W perpendicular to another pair of parallel second edges of length L, which dimension L defines a corresponding resonant frequency,the patches forming an array of groups, each such group comprising a first patch fed from a feed line and a pair of second patches each adjacent to and spaced from one of the second edges L of the first patch, the second patches being fed only parasitically from the first patch,the groups being spaced apart on the substrate in said array with the spacing between patches of adjacent groups exceeding the spacing between patches within a group.
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Abstract
A patch array microwave antenna comprising spaced sub-arrays each consisting of a patch and at least a pair of parasitic patches fed from the non-radiating edges of the fed patch. In a second embodiment a second pair of parasitic patches fed from the radiating edges are also provided so as to form a five-member cross. Spacings between patches in a group are kept to below λ/15, and groups spaced apart by at least double this. Intergroup distances P are kept below 2λ, but may be greater than λ if alternate lines of patches are staggered by P/2 so no on-axis diffraction lobes appear in the radiation pattern.
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Citations
25 Claims
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1. An antenna comprising:
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a plurality of substantially rectangular patches, disposed upon a common substrate, each patch having a pair of parallel first edges of length W perpendicular to another pair of parallel second edges of length L, which dimension L defines a corresponding resonant frequency, the patches forming an array of groups, each such group comprising a first patch fed from a feed line and a pair of second patches each adjacent to and spaced from one of the second edges L of the first patch, the second patches being fed only parasitically from the first patch, the groups being spaced apart on the substrate in said array with the spacing between patches of adjacent groups exceeding the spacing between patches within a group. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. An antenna comprising:
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a plurality of elemental groups disposed in an array upon a first substrate, each group having a transmission line fed central patch and four parasitic patches, parasitically fed from the central patch, disposed around the central patch so as to form a cross, wherein the elemental groups are arranged in a plurality of parallel lines of groups, centers of adjacent groups along each parallel line being distanced by a distance P which is less than twice the resonant frequency wavelength λ
, alternate ones of said parallel lines being displaced along a direction orthogonal to the parallel lines by P/2 so that the effective distance between centers of adjacent groups is less than λ
. - View Dependent Claims (13, 14, 15)
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16. An antenna comprising:
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a plurality of elemental groups disposed in an array upon a first substrate, each group having a central patch fed from a feed line and four parasitic patches parasitically fed from the central patch, disposed around the central patch so as to form a cross, wherein the elemental groups are arranged in a plurality of parallel lines of groups, centers of adjacent groups along each parallel line being distanced by a distance P which is less than twice the resonant frequency wavelength λ
, alternate ones of said parallel lines being displaced along a direction parallel to the parallel lines by P2 so that the effective distance between centers of adjacent groups is less than λ
, anda feed network having a plurality of feed lines disposed upon one face of a second substrate parallel with the first-mentioned substrate and aligned so that one of said feed lines lies adjacent a feed point of each central patch, and having a ground plane disposed between said substrates which ground plane includes an aperture between each said feed point and the adjacent respective one of said feed lines.
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17. An array of microstrip antenna patches including both fed and parasitically fed patches, said array comprising:
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an array of groups of patches disposed on the surface of a common substrate; each said group including at least one transmission line fed patch and at least two parasitically fed patches that have edges spaced from edges of the transmission line fed patch by an interpatch spacing distance that is less than the intergroup spacing distance between the outside edges of adjacent groups of patches. - View Dependent Claims (18, 19, 20, 21, 22, 23, 24)
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25. An antenna comprising:
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a substrate; a feedline; a plurality of substantially rectangular patches arranged on a substrate in groups, the spacing between patches of adjacent groups exceeding the spacing between patches within a group, each group of patches including (a) a primary patch coupled to the feedline having a first pair of parallel edges and a second pair of parallel edges, said second pair of edges having a length defining a resonant antenna operating frequency, and (b) a pair of secondary patches, each secondary patch being adjacent to and spaced from one of the second pair of primary patch edges, whereby the secondary patches are parasitically fed from the primary patch while the groups of patches are spaced apart on the substrate in an array.
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Specification