Patent US3513604A successfully refreshed from Google Patents.
Patent US4016569A successfully refreshed from Google Patents.
US4016569A
Expired / Lapsed
US
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Near field antenna boresight alignment apparatus
Assignee: United States Department of the Air Force
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Filing: 1975-10-03
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Granted: 1977-04-05
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Expires: 1995-10-03
Abstract
Abstract Alignment of the optical, mechanical and electrical axes of an antenna system is accomplished at short range by means of a test antenna having an aperture that is approximately 20 percent greater than the aperture of the antenna being aligned. The test antenna is positioned to receive or transmit radiation from/to the antenna being aligned at a distance of less than D 2 /λ where D is the diameter of the antenna aperture and λ is the wavelength of the antenna operating frequency.
Inventors
- 👤 Edgar W. Buebel, Jr.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 18:51
CPC Classifications
G; G01; G01V; G01V13/00; G01R; G01R29/00; G01R29/08; G01R29/10
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
105 words
In combination with an antenna that utilizes boresight alignment apparatus of the type wherein standard practice requires 2 D 2 /λ spacing between antenna and test antenna, D being the antenna aperture diameter and λ being the wavelength of the antenna operating frequency, the improvement wherein the spacing between antenna and test antenna is reduced while achieving the same results as standard practice apparatus said improvement comprising a test antenna having an aperture approximately 20 percent greater than the aperture of said antenna, said test antenna being positioned to receive radiation transmitted by said antenna at a distance therefrom of approximately 0.15 D 2 /λ.
Claim 2
Dependent Claim
105 words
In combination with an antenna that utilizes boresight alignment apparatus of the type wherein standard practice requires 2 D 2 /λ spacing between antenna and test antenna, D being the antenna aperture diameter and λ being the wavelength of the antenna operating frequency, the improvement wherein the spacing between antenna and test antenna is reduced while achieving the same results as standard practice apparatus said improvement comprising a test antenna having an aperture approximately 20 percent greater than the aperture of said antenna, said test antenna being positioned to receive radiation transmitted by said antenna at a distance therefrom of approximately 0.15 D 2 /λ.
References Cited (Backward Citations)
US3302205A
Cited
US3806943A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-04-04 | 1980-10-04 | 1981-04-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-04-04 | 1984-10-04 | 1985-04-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-04-04 | 1988-10-04 | 1989-04-05 | $7700.00 | Window Closed / Lapsed |