US4555708A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Dipole ring array antenna for circularly polarized pattern
Assignee: Boeing North American Inc
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Filing: 1984-01-10
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Granted: 1985-11-26
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Expires: 2004-01-10
Abstract
Abstract A NAVSTAR satellite has a navigation antenna array beamed toward the earth. A communications antenna array for communicating with other satellites requires a pattern null near the axis and high gain to the sides with minimum losses. This is achieved with a dipole ring array comprising eight elements surrounding the navigation array. The ring has a diameter of 1.1 wavelength, and is fed with equal amplitudes and a third mode phase progression, which produces good circular polarization in the far field. For a different sized dipole ring, there will still be an optimum phase distribution which will give good circularly polarized patterns.
Inventors
- 👤 Douglas K. Waineo
- 👤 Sam S. Wong
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 23:51
CPC Classifications
H; H01; H01Q; H01Q21/00; H01Q21/24; H01Q21/06; H01Q21/20; H01Q25/00; H01Q25/002; H01Q9/00; H01Q9/04; H01Q9/06; H01Q9/065; Y; Y10; Y10S; Y10S343/00; Y10S343/02
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
90 words
In an antenna configuration for a satellite having a first array beamed toward the earth, and a second array with a null toward the earth for communication with other satellites; wherein said second array comprises N dipole elements arranged in a ring forming a full circle, the diameter of the ring and the phase distribution to the N elements being selected to produce circular polarization in the far field, the phase to each element being P° I/N, where P is a multiple of 360° and I is the element number.
Claim 2
Dependent Claim
90 words
In an antenna configuration for a satellite having a first array beamed toward the earth, and a second array with a null toward the earth for communication with other satellites; wherein said second array comprises N dipole elements arranged in a ring forming a full circle, the diameter of the ring and the phase distribution to the N elements being selected to produce circular polarization in the far field, the phase to each element being P° I/N, where P is a multiple of 360° and I is the element number.
Claim 3
Dependent Claim
19 words
The apparatus according to claim 1, wherein the diameter of the ring is 1.1 wavelength, and P equals 1080°.
Claim 4
Dependent Claim
12 words
The apparatus according to claim 2, wherein N is equal to eight.
Claim 5
Dependent Claim
51 words
A dipole ring array for producing circular polarization, comprising a ring of eight elements forming a full circle, the diameter being 1.1 wavelengths and the phase distribution being selected for optimum circular polarization in the far field, the phase to each element being 1080° I/8, where I is the element number.
Claim 6
Dependent Claim
51 words
A dipole ring array for producing circular polarization, comprising a ring of eight elements forming a full circle, the diameter being 1.1 wavelengths and the phase distribution being selected for optimum circular polarization in the far field, the phase to each element being 1080° I/8, where I is the element number.
References Cited (Backward Citations)
US4103304A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1988-11-25 | 1989-05-27 | 1989-11-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-11-25 | 1993-05-27 | 1993-11-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-11-25 | 1997-05-27 | 1997-11-26 | $7700.00 | Window Closed / Lapsed |