US4001832A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Vertical antenna having an off-center supply
Assignee: Thales SA
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Filing: 1975-10-02
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Granted: 1977-01-04
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Expires: 1995-10-02
Abstract
Abstract A vertical grounded antenna is supplied at one third of its height. The antenna is substantially a whole wave antenna and, in order to reduce the secondary lobes of the vertical pattern of said antenna, its height is so determined as to produce an inversion of the sign of the phase of the current on each side of the feed input.
Inventors
- 👤 Rene Chesneau
- 👤 Jean-Marc Martin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 21:23
CPC Classifications
H; H01; H01Q; H01Q25/00; H01Q9/00; H01Q9/04; H01Q9/16; H01Q9/18
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
65 words
A vertical antenna having an insulator at substantially one third of its height and a feed input comprising two terminals, said terminals being separated by said insulator, said height being substantially equal to 0.9λ, where λ is the wavelength corresponding to its operational frequency, in order to produce an inversion of the sign of the phase of the current above and under said feed input.
Claim 2
Dependent Claim
65 words
A vertical antenna having an insulator at substantially one third of its height and a feed input comprising two terminals, said terminals being separated by said insulator, said height being substantially equal to 0.9λ, where λ is the wavelength corresponding to its operational frequency, in order to produce an inversion of the sign of the phase of the current above and under said feed input.
Claim 3
Dependent Claim
78 words
A vertical antenna as claimed in claim 1, comprising a low impedance, a high impedance and a switch for connecting the base of the antenna to the ground, either through said low impedance for operation with an inversion of sign of the phase of the current on each side of said feed input so as to reduce the secondary lobes, or through said high impedance so as to obtain a vertical pattern facilitating a propagation by ionospheric waves.
Claim 4
Dependent Claim
20 words
A vertical antenna as claimed in claim 1, comprising a tuning impedance inserted in said antenna above said feed input.
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) | 1980-01-04 | 1980-07-05 | 1981-01-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-01-04 | 1984-07-05 | 1985-01-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-01-04 | 1988-07-05 | 1989-01-04 | $7700.00 | Window Closed / Lapsed |