Patent US4086591A successfully refreshed from Google Patents.
US4086591A
Expired / Lapsed
US
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Small aperture antenna
Assignee: Raytheon Co
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Filing: 1976-09-28
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Granted: 1978-04-25
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Expires: 1996-09-28
Abstract
Abstract A device for reducing the backlobe radiation from small aperture antennas is shown to comprise a thin hemispherical radome having both radio frequency energy absorbing and reflecting materials attached thereto. The absoring material dissipates a portion of the edge currents existing on the antenna aperture, while the reflecting material intercepts a portion of the energy radiated from the antenna and reflects that portion back to the edge of the antenna to produce destructive interference with the edge currents.
Inventors
- 👤 Kazimierz Siwiak
- 👤 Robert L. Moran
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 06:47
CPC Classifications
H; H01; H01Q; H01Q1/00; H01Q1/40; H01Q1/405; H01Q17/00; H01Q17/001; H01Q19/00; H01Q19/06
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
115 words
A device for reducing the backlobe radiation from a small aperture antenna wherein such radiation is caused by radio frequency currents excited on the edge of said antenna, such device comprising: (a) a radome attached to the edge of the antenna and completely enclosing the radiating end of said antenna; (b) means, mounted to the radome, for absorbing a portion of the radio frequency currents; (c) means, disposed on the surface of the radome, for suppressing a portion of the energy radiated from the edge of the antenna; and, (d) means, mounted to said radome, for reflecting a portion of the radio frequency energy radiated from the antenna back to the edge of said antenna.
Claim 2
Independent Claim
115 words
A device for reducing the backlobe radiation from a small aperture antenna wherein such radiation is caused by radio frequency currents excited on the edge of said antenna, such device comprising: (a) a radome attached to the edge of the antenna and completely enclosing the radiating end of said antenna; (b) means, mounted to the radome, for absorbing a portion of the radio frequency currents; (c) means, disposed on the surface of the radome, for suppressing a portion of the energy radiated from the edge of the antenna; and, (d) means, mounted to said radome, for reflecting a portion of the radio frequency energy radiated from the antenna back to the edge of said antenna.
Claim 3
Dependent Claim
39 words
The device as recited in claim 1 wherein said absorbing means comprises a double layer of radio frequency absorbing material mounted to the inner surface of said radome in those quadrants corresponding to the E-plane quadrants of said radome.
Claim 4
Dependent Claim
31 words
The device as recited in claim 1 wherein said suppressing means comprises metal strips mounted on the H-plane quadrants of the radome and grounded to the outer surface of said antenna.
Claim 5
Dependent Claim
36 words
The devce as recited in claim 1 wherein said reflecting means comprises this metal strips mounted on the surface of said radome, at least one of said strips being located in each quadrant of said antenna.
Claim 6
Dependent Claim
33 words
The device as recited in claim 2 wherein said absorbing material extends along the inner surface of the radome for a distance of λ/4 (where λ is the operating wavelength of the antenna).
Claim 7
Dependent Claim
44 words
The device as recited in claim 4 wherein the pathlength traveled by the energy radiated from the antenna and reflected from said metal strips back to the edge of the antenna is equal to λ/2 (where λ is the operating wavelength of the antenna).
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) | 1981-04-24 | 1981-10-24 | 1982-04-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-04-24 | 1985-10-24 | 1986-04-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-04-24 | 1989-10-24 | 1990-04-25 | $7700.00 | Window Closed / Lapsed |