US3820118A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Antenna and interface structure for use with radomes
Assignee: Bendix Corp
•
Filing: 1972-12-08
•
Granted: 1974-06-25
•
Expires: 1992-12-08
Abstract
Abstract Where a planar microwave antenna is installed inside a curved radome, there is usually space between the surface of the antenna and the inside of the radome which forms a discontinuity adversely affecting performance. The antenna element can be formed over a domed substrate which takes up much of this space, but the curvature of the substrate and that of the radome seldom match so that a significant space still exists. A sheet of flexible, compressible material having a dielectric constant and dissipation factor substantially the same as that of the radome is interposed between the antenna and the radome to take up any space so that no significant discontinuity exists between the face of the antenna and the outside face of the radome.
Inventors
- 👤 R Hall
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 12:10
CPC Classifications
H; H01; H01Q; H01Q1/00; H01Q1/42
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
97 words
An antenna structure comprising a radome having curved inside and outside surfaces, a generally circular, cavity-backed planar microwave antenna having a spiral antenna element pattern fastened to the inside surface of said radome, characterized in that said spiral antenna element pattern is formed on a domeshaped substrate, and a layer of flexible compressible material having a dielectric constant and dissipation factor essentially like that of the radome material is interposed between said domeshaped substrate and the inside surface of said radome whereby any space between said substrate and said inside surface is filled with said compressible material.
Claim 2
Dependent Claim
97 words
An antenna structure comprising a radome having curved inside and outside surfaces, a generally circular, cavity-backed planar microwave antenna having a spiral antenna element pattern fastened to the inside surface of said radome, characterized in that said spiral antenna element pattern is formed on a domeshaped substrate, and a layer of flexible compressible material having a dielectric constant and dissipation factor essentially like that of the radome material is interposed between said domeshaped substrate and the inside surface of said radome whereby any space between said substrate and said inside surface is filled with said compressible material.
Claim 3
Dependent Claim
112 words
For use with a radome having inside and outside surfaces, a planar element antenna structure adapted to be attached to the inside surface of said radome, said antenna structure being formed on a substrate having a convex curved surface and being mounted on a housing containing at least one microwave cavity, a layer of flexible compressible material having a dielectric constant essentially like that of the radome material interposed between said antenna structure and the inside surface of said radome, and said housing including means for fastening said antenna structure to said radome and thereby compressing said flexible compressible material between said convex curved surface and the inside surface of said radome.
Claim 4
Dependent Claim
112 words
For use with a radome having inside and outside surfaces, a planar element antenna structure adapted to be attached to the inside surface of said radome, said antenna structure being formed on a substrate having a convex curved surface and being mounted on a housing containing at least one microwave cavity, a layer of flexible compressible material having a dielectric constant essentially like that of the radome material interposed between said antenna structure and the inside surface of said radome, and said housing including means for fastening said antenna structure to said radome and thereby compressing said flexible compressible material between said convex curved surface and the inside surface of said radome.
Claim 5
Dependent Claim
27 words
A planar element antenna structure as set forth in claim 2 wherein the dissipation factors of said flexible compressible material and said radome are substantially the same.
Claim 6
Independent Claim
85 words
A method of eliminating losses due to discontinuities in a planar antenna structure mounted within a curved radome comprising the steps of: a. forming a spacer member of a compressible material having a dielectric and dissipation factor approximately the same as that of said radome; and b. interposing said spacer member between said antenna structure and said radome and fastening said antenna structure to the inside of said radome such that said spacer member takes up any space between said antenna structure and said radome.
Claim 7
Independent Claim
85 words
A method of eliminating losses due to discontinuities in a planar antenna structure mounted within a curved radome comprising the steps of: a. forming a spacer member of a compressible material having a dielectric and dissipation factor approximately the same as that of said radome; and b. interposing said spacer member between said antenna structure and said radome and fastening said antenna structure to the inside of said radome such that said spacer member takes up any space between said antenna structure and said radome.
Claim 8
Dependent Claim
32 words
A method of eliminating losses due to discontinuities in a planar antenna structure as set forth in claim 4 including the further step of attaching said antenna structure on a dome-shaped substrate.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-06-24 | 1977-12-24 | 1978-06-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-06-24 | 1981-12-24 | 1982-06-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-06-24 | 1985-12-24 | 1986-06-25 | $7700.00 | Window Closed / Lapsed |