US3825933A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Spiral antenna stripline termination
Assignee: United States Department of the Air Force
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Filing: 1973-07-18
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Granted: 1974-07-23
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Expires: 1993-07-18
Abstract
Abstract A high power stripline termination for a spiral antenna is provided wherein the termination is mounted within the cavity of the antenna. The termination is comprised of a spiraling length of transmission line etched on a lossy substrate. The spiraling line permits the use of an effectively long transmission line within a small area.
Inventors
- 👤 T Debski
- 👤 J Gaudio
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 12:33
CPC Classifications
H; H01; H01Q; H01Q9/00; H01Q9/04; H01Q9/16; H01Q9/26; H01Q9/27
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
137 words
High power stripline terminations for a spiral antenna having a spiral radiator and an associated cavity comprising a spiral having first and second ends, a cavity associated with said spiral radiator, said cavity having metal walls, first and second stripline terminations, each stripline termination consisting of a first lossy substrate having an outer conductive surface and an inner surface with an etched spiraling transmission line thereupon, a second lossy substrate having an inner surface and an outer conductive surface with said inner surfaces bonded together, each of said spiraling transmission lines having a preselected axial ratio, means to mount said first and second stripline terminations within said cavity adjacent to the metal walls thereof thus also becoming a heat sink, and means to connect said first and second stripline terminations to said first and second ends, respectively.
Claim 2
Dependent Claim
137 words
High power stripline terminations for a spiral antenna having a spiral radiator and an associated cavity comprising a spiral having first and second ends, a cavity associated with said spiral radiator, said cavity having metal walls, first and second stripline terminations, each stripline termination consisting of a first lossy substrate having an outer conductive surface and an inner surface with an etched spiraling transmission line thereupon, a second lossy substrate having an inner surface and an outer conductive surface with said inner surfaces bonded together, each of said spiraling transmission lines having a preselected axial ratio, means to mount said first and second stripline terminations within said cavity adjacent to the metal walls thereof thus also becoming a heat sink, and means to connect said first and second stripline terminations to said first and second ends, respectively.
Claim 3
Dependent Claim
35 words
High power stripline terminations as described in claim 1 wherein each of said outer conductive surfaces is comprised of a sheet of copper, said sheet being bonded to the outer surface of said lossy substrate.
References Cited (Backward Citations)
US3019439A
Cited
US3509495A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-07-22 | 1978-01-21 | 1978-07-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-07-22 | 1982-01-21 | 1982-07-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-07-22 | 1986-01-21 | 1986-07-23 | $7700.00 | Window Closed / Lapsed |