Patent US4697189A successfully refreshed from Google Patents.
US4697189A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Microstrip antenna
Assignee: University of Queensland
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Filing: 1986-04-24
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Granted: 1987-09-29
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Expires: 2006-04-24
Abstract
Abstract A microwave antenna formed with a conductive patch supported over and facing a ground plate beneath a support sheet overlapping the ground plate and spaced therefrom. An electrical lead to the patch is passed up through the ground plate to a hole through the patch and support sheet through which a solder joint is formed.
Inventors
- 👤 John B. Ness
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 06:58
CPC Classifications
H; H01; H01Q; H01Q9/00; H01Q9/04; H01Q9/0407
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
110 words
A microwave antenna including: a ground plate; a substanially planar support means spaced from the ground plate to provide an air gap therebetween; a metal patch on the support means, said metal patch being provided on a face of the support means which is directed towards the ground plate; an electrical conductor means connected to the metal patch and ground plate; and the support means and the ground plate being provided with complementary peripheral flanges which are adjustably slidably engaged together to hold the support means over the ground plate at a selected spacing therefrom, with the variation of the spacing effecting adjustment of the thickness of the air gap.
Claim 2
Dependent Claim
110 words
A microwave antenna including: a ground plate; a substanially planar support means spaced from the ground plate to provide an air gap therebetween; a metal patch on the support means, said metal patch being provided on a face of the support means which is directed towards the ground plate; an electrical conductor means connected to the metal patch and ground plate; and the support means and the ground plate being provided with complementary peripheral flanges which are adjustably slidably engaged together to hold the support means over the ground plate at a selected spacing therefrom, with the variation of the spacing effecting adjustment of the thickness of the air gap.
Claim 3
Dependent Claim
20 words
A microwave antenna as claimed in claim 1, wherein a layer of dielectric material is inserted into the air gap.
Claim 4
Dependent Claim
29 words
A microwave antenna as claimed in claim 2, wherein the effective dielectric constant of the air gap and the dielectric material is in the range of 1.2 to 1.4.
Claim 5
Dependent Claim
30 words
A microwave antenna as claimed in claim 1, wherein said support means and ground plate have a generally circular geometry and are generally coaxial with and metal patch disposed coaxially.
Claim 6
Dependent Claim
15 words
A microwave antenna as claimed in claim 4, wherein the metal patch is also circular.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1990-09-28 | 1991-03-30 | 1991-09-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-09-28 | 1995-03-30 | 1995-09-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-09-28 | 1999-03-30 | 1999-09-29 | $7700.00 | Window Closed / Lapsed |