US4084162A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Folded back doublet microstrip antenna
Assignee: Direction Générale de l'Armement
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Filing: 1976-05-14
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Granted: 1978-04-11
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Expires: 1996-05-14
Abstract
Abstract A folded back doublet antenna including two symmetrical half-plates separd at their one ends by a cut, a long, continuous plate separated from one side of each of the half-plates by a gap, linking sections joining the other external ends of the half-plates to respective ends of the continuous plate, and a line feeding the antenna in the vicinity of the cut and extending along the axis of symmetry of the half-plates. The half-plates have a common width, which is much larger than the width of the continuous plate. The half-plates constitute an input side and the continuous plate constitutes a folded back side.
Inventors
- 👤 Gerard Dubost
- 👤 Henri Albert Havot
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 00:03
CPC Classifications
H; H01; H01Q; H01Q9/00; H01Q9/04; H01Q9/06; H01Q9/065; H01Q19/00; H01Q19/10; H01Q9/16; H01Q9/26
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
176 words
A folded back doublet antenna system comprising: (a) two symmetrical half-plates separated at their one ends by a cut; (b) a long, continuous plate separated from one side of each of said half-plates by a gap, said half-plates constituting an input side and said continuous plate constituting a folded back side, said half-plates having a common width which is much larger than the width of said continuous plate, said continuous plate being joined at its ends to, respectively, the other external ends of said half-plates by respective linking sections, said half-plates and continuous plate forming a doublet antenna; (c) a line feeding the doublet antenna in the vicinity of said cut and extending along the axis of symmetry of said half-plates; and (d) a plane reflector of appreciably larger dimensions than the doublet antenna, the doublet antenna being at a distance of 3/100 of λ from said reflector and having a length of approximately 0.6 λ, the width of the antenna being less, wherein λ represents the medium wavelength of the band pass of said antenna.
Claim 2
Dependent Claim
176 words
A folded back doublet antenna system comprising: (a) two symmetrical half-plates separated at their one ends by a cut; (b) a long, continuous plate separated from one side of each of said half-plates by a gap, said half-plates constituting an input side and said continuous plate constituting a folded back side, said half-plates having a common width which is much larger than the width of said continuous plate, said continuous plate being joined at its ends to, respectively, the other external ends of said half-plates by respective linking sections, said half-plates and continuous plate forming a doublet antenna; (c) a line feeding the doublet antenna in the vicinity of said cut and extending along the axis of symmetry of said half-plates; and (d) a plane reflector of appreciably larger dimensions than the doublet antenna, the doublet antenna being at a distance of 3/100 of λ from said reflector and having a length of approximately 0.6 λ, the width of the antenna being less, wherein λ represents the medium wavelength of the band pass of said antenna.
Claim 3
Dependent Claim
18 words
A folded back doublet antenna according to claim 1, wherein said half-plates and said continuous plate are rectangular.
Claim 4
Dependent Claim
35 words
A folded back doublet antenna according to claim 1, wherein said half-plates are rectangular, except in the vicinity of said cut where the corners of said half-plates are cut away, and said plate is rectangular.
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) | 1981-04-10 | 1981-10-10 | 1982-04-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-04-10 | 1985-10-10 | 1986-04-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-04-10 | 1989-10-10 | 1990-04-11 | $7700.00 | Window Closed / Lapsed |