US4031539A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Broadband turnstile antenna
Assignee: SPX Technologies Inc
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Filing: 1975-12-11
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Granted: 1977-06-21
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Expires: 1995-12-11
Abstract
Abstract A truncated conical member of conductive material is mounted forward of a pair of crossed dipoles, the legs of which are inclined toward a reflector. The pair of dipoles cross orthogonal to each other at the dipole centers with the dipole halves being fed with equal power in the relative phase rotation of 0°, 90°, 180° and 270°.
Inventors
- 👤 Oakley McDonald Woodward
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 19:47
CPC Classifications
H; H01; H01Q; H01Q21/00; H01Q21/24; H01Q21/26
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
77 words
A broadband turnstile antenna comprising: a pair of crossed dipoles mounted forward of a reflective surface, said dipoles being center fed with the legs of the dipoles fed with equal power in the relative phase rotation of 0°, 90°, 180° and 270°, and a single member of conductive material closely spaced forward of said dipole legs and separated therefrom with said member overlapping the feed point of said dipoles and a substantial portion of said dipole legs.
Claim 2
Dependent Claim
77 words
A broadband turnstile antenna comprising: a pair of crossed dipoles mounted forward of a reflective surface, said dipoles being center fed with the legs of the dipoles fed with equal power in the relative phase rotation of 0°, 90°, 180° and 270°, and a single member of conductive material closely spaced forward of said dipole legs and separated therefrom with said member overlapping the feed point of said dipoles and a substantial portion of said dipole legs.
Claim 3
Dependent Claim
20 words
The combination of claim 1 wherein said dipole legs are inclined toward said reflector, and said member is conically shaped.
Claim 4
Dependent Claim
22 words
The combination of claim 2 wherein said conically shaped member is a truncated cone with the truncated portion overlapping the feed point.
Claim 5
Dependent Claim
19 words
The combination of claim 2 wherein said member overlaps over one half of the length of the dipole legs.
Claim 6
Dependent Claim
86 words
A broadband turnstile antenna comprising: a pair of crossed dipoles mounted forward of a flat reflecting screen, said dipoles having legs which are inclined toward said screen, said dipoles being center fed with the legs of the dipoles fed with equal power in the relative phase rotation of 0°, 90°, 180° and 270°, and a conically-shaped member of conductive material closely spaced forward of said dipole legs with said member overlapping the feed point of said dipoles and over one-half the length of the dipole legs.
Claim 7
Dependent Claim
86 words
A broadband turnstile antenna comprising: a pair of crossed dipoles mounted forward of a flat reflecting screen, said dipoles having legs which are inclined toward said screen, said dipoles being center fed with the legs of the dipoles fed with equal power in the relative phase rotation of 0°, 90°, 180° and 270°, and a conically-shaped member of conductive material closely spaced forward of said dipole legs with said member overlapping the feed point of said dipoles and over one-half the length of the dipole legs.
Claim 8
Dependent Claim
41 words
The combination of claim 5 wherein said legs are inclined at an angle of 45° with respect to vertical supports for the dipole legs which supports extend perpendicular to said reflecting surface and the member is a truncated conically shaped member.
Claim 9
Dependent Claim
96 words
The combination of claim 6 wherein said dipole legs are approximately 0.277 λ o length long and 0.02 λ o in diameter, the side of the cone is 0.195 λ o long, is 0.17 λ o high and is spaced about 0.017 λ o from the dipole legs, the dipole legs are fed at a point about 0.28 λ o from the reflector surface and the end of the truncated portion of the cone is about 0.31 λ o from the reflecting surface, where λ o is a wavelength at the midband frequency of said antenna.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-06-20 | 1980-12-20 | 1981-06-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-06-20 | 1984-12-20 | 1985-06-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-06-20 | 1988-12-20 | 1989-06-21 | $7700.00 | Window Closed / Lapsed |