US3828351A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Broadband spiral antenna
Assignee: Singer Co
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Filing: 1973-07-23
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Granted: 1974-08-06
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Expires: 1993-07-23
Abstract
Abstract A frequency independent spiral antenna having a plurality of pairs of arms energized with currents equal to the sine of the respective terminal position angles of the arms for substantially removing bandwidth limitations.
Inventors
- 👤 G Voronoff
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 16:36
CPC Classifications
H; H01; H01Q; H01Q21/00; H01Q21/06; H01Q21/20; H01Q9/00; H01Q9/04; H01Q9/16; H01Q9/26; H01Q9/27
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
79 words
A broadband frequency-independent spiral antenna comprising an even number of spiral arms equally spaced circumferentially about a center and having a center line extending through the inner terminals of two opposite arms, and means energizing said arms in accordance with the relationship In Sin phi n where In is the excitation current of the nth arm of the antenna and phi is the angle between the center line and the inner terminal of the nth arm of the antenna.
Claim 2
Dependent Claim
79 words
A broadband frequency-independent spiral antenna comprising an even number of spiral arms equally spaced circumferentially about a center and having a center line extending through the inner terminals of two opposite arms, and means energizing said arms in accordance with the relationship In Sin phi n where In is the excitation current of the nth arm of the antenna and phi is the angle between the center line and the inner terminal of the nth arm of the antenna.
Claim 3
Dependent Claim
52 words
The antenna of claim 1 further defined by said means energizing said antenna arms comprising a circuit element adapted to receive electrical current and pass current onto two output lines in opposite phase, and a pair of power dividers connected one in each of said output lines and to separate antenna arms.
Claim 4
Dependent Claim
27 words
The antenna of claim 1 further defined by means resistively loading each of said antenna arms adjacent the outer ends thereof for suppressing mode 7 radiation therefrom.
References Cited (Backward Citations)
US3624658A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-08-05 | 1978-02-04 | 1978-08-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-08-05 | 1982-02-04 | 1982-08-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-08-05 | 1986-02-04 | 1986-08-06 | $7700.00 | Window Closed / Lapsed |