US4755820A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Antenna device
Assignee: UK Secretary of State for Defence
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Filing: 1986-08-04
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Granted: 1988-07-05
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Expires: 2006-08-04
Abstract
Abstract An antenna device comprises a dielectric sheet substrate having an antenna patch on one surface and a ground plane on the other surface. A hemispherical dielectric lens is arranged over the antenna patch in intimate contact with it. The substrate and the lens are of low and high permittivity material respectively. The lens couples the antenna patch radiation away from the substrate. This avoids the inefficiency arising from power trapping in the substrate of a prior art microstrip patch antenna. The antenna device radiates into a comparatively narrow cone axially perpendicular to the antenna patch, and coupling of radiation from a power source to free space can theoretically be 100%. The antenna impedance is a function of its structural geometry, and is easily designed for impedance matching to a power source.
Inventors
- 👤 Paul M. Backhouse
- 👤 Norman Apsley
- 👤 Huw D. Rees
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 17:50
CPC Classifications
H; H01; H01Q; H01Q9/00; H01Q9/04; H01Q9/0407; H01Q19/00; H01Q19/06; H01Q19/062; H01Q19/10; H01Q19/12; H01Q19/13
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
88 words
An antenna device including a dielectric sheet having two surfaces separated by the sheet thickness dimension, a conducting ground plane disposed on one sheet surface, a conducting antenna patch disposed on the other sheet surface, means for energising the antenna patch, and a low-loss dielectric coupling member arranged over the antenna patch to couple radiation therefrom away from the dielectric sheet, the coupling member having a dielectric constant at least twice that of the sheet and having a cross-sectional area reducing with perpendicular distance from the antenna patch.
Claim 2
Dependent Claim
88 words
An antenna device including a dielectric sheet having two surfaces separated by the sheet thickness dimension, a conducting ground plane disposed on one sheet surface, a conducting antenna patch disposed on the other sheet surface, means for energising the antenna patch, and a low-loss dielectric coupling member arranged over the antenna patch to couple radiation therefrom away from the dielectric sheet, the coupling member having a dielectric constant at least twice that of the sheet and having a cross-sectional area reducing with perpendicular distance from the antenna patch.
Claim 3
Dependent Claim
24 words
An antenna device according to claim 1 wherein the coupling member has a circular cross-section reducing in diameter with distance from the antenna patch.
Claim 4
Dependent Claim
13 words
An antenna device according to claim 1 wherein the coupling member is hemispherical.
Claim 5
Dependent Claim
24 words
An antenna device according to claim 3 including focussing means arranged to render parallel radiation from the antenna patch received via the coupling member.
Claim 6
Dependent Claim
32 words
An antenna device according to claim 1 wherein the coupling member is of tapering cross-section and is arranged to launch radiation from the antenna patch into a waveguide of like cross-sectional shape.
Claim 7
Dependent Claim
23 words
An antenna device according to claim 1 wherein the dielectric sheet is of plastics material and the coupling member is of ceramic material.
Claim 8
Dependent Claim
15 words
An antenna device according to claim 1 wherein the dielectric sheet is of semiconductor material.
Claim 9
Dependent Claim
25 words
An antenna device according to claim 7 wherein the means for energising the antenna patch is a solid state device integrated in the dielectric sheet.
References Cited (Backward Citations)
US4012741A
Cited
US4072952A
Cited
US4490721A
Cited
US4600018A
Cited
GB2131232A
Cited
US4654622A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1991-07-05 | 1992-01-04 | 1992-07-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-07-05 | 1996-01-04 | 1996-07-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-07-05 | 2000-01-04 | 2000-07-05 | $7700.00 | Window Closed / Lapsed |