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EP0270209A2 Expired / Lapsed EP ⏱️ 0.0 years remaining

Dual-band circularly polarised antenna with hemispherical coverage

Assignee: Nortel Networks Ltd
•
Filing: 1987-09-09
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Granted: —
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Expires: 2007-09-09
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Abstract

Abstract A circularly polarised antenna including first and second multiple patch antenna structures dimensioned to operate at two distinct frequencies, each antenna structure consisting of four shorted patches, the patches (11a) of the first structure being spaced from a ground plane (10) by dielectric material (12), the patches (14a) of the second structure being spaced from the patches of the first structure by dielectric material (13), the patches of the second structure each overlying a corresponding patch of the first structure and each having a dimension λ m (2) /4 which is less than the dimension λ m (1) /4 of the corresponding patch of the first structure, with feed means (16a, 17a) for each of the patches, the patches of both structures being disposed in the planes of the patches so that the radiating edges of the two patch structures form superimposed antenna structures.

Inventors

  • 👤 Martin Stevens Smith

Bibliographic Details

Application Number —
Jurisdiction EP
Data Source google_patents
Last Synchronized 2026-11-03 00:03
CPC Classifications
H; H01; H01Q; H01Q21/00; H01Q21/24; H01Q5/00; H01Q5/40; H01Q5/42; H01Q9/00; H01Q9/04; H01Q9/0407

Claims Analysis

Total Claims: 8
Claim 1
Independent Claim 148 words
A circularly polarised antenna characterised in that the antenna includes first and second multiple patch antenna structures dimensioned to operate at two distinct frequencies, each antenna structure consisting of a like plurality of patches of electrically conductive material, the patches of the first structure being spaced from a ground plane by dielectric material, the patches of the second structure being spaced from the patches of the first structure by dielectric material, the patches of the second structure each overlying a corresponding patch of the first structure and each having a dimension λ m (2) /4 which is less than the dimension λ m (1) /4 of the corresponding patch of the first structure, with feed means for each of the patches, the patches of both structures being disposed in the planes of the patches so that the radiating edges of the two patch structures form superimposed antenna structures.
Claim 2
Dependent Claim 148 words
A circularly polarised antenna characterised in that the antenna includes first and second multiple patch antenna structures dimensioned to operate at two distinct frequencies, each antenna structure consisting of a like plurality of patches of electrically conductive material, the patches of the first structure being spaced from a ground plane by dielectric material, the patches of the second structure being spaced from the patches of the first structure by dielectric material, the patches of the second structure each overlying a corresponding patch of the first structure and each having a dimension λ m (2) /4 which is less than the dimension λ m (1) /4 of the corresponding patch of the first structure, with feed means for each of the patches, the patches of both structures being disposed in the planes of the patches so that the radiating edges of the two patch structures form superimposed antenna structures.
Claim 3
Dependent Claim 14 words
An antenna according to claim 1 characterised in that said patches are shorted patches.
Claim 4
Dependent Claim 31 words
An antenna according to claim 1 or 2 characterised in that the shorted edges of corresponding patches are shorted to ground via a common set of shorting pins or plated edge.
Claim 5
Dependent Claim 27 words
An antenna according to claim 1, 2 or 3 characterised in that the first and second patch antenna structures are each crossed slot structures having four patches.
Claim 6
Dependent Claim 44 words
An antenna according to any preceding claim characterised in that the dielectric material between the patches of the first structure and the ground plane has a different dielectric constant from that of the dielectric material between the patches of the first and second structures.
Claim 7
Dependent Claim 27 words
An antenna according to claim 2 characterised in that the shorted edges of corresponding patches of the structures are shorted to ground via separate respective shorting planes.
Claim 8
Dependent Claim 33 words
An antenna according to any preceding claim characterised in that the patches and the ground plane are formed of copper foil carried on the face or faces of sheets of solid dielectric material.

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