US3987453A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Balanced exciter for wideband antenna element
Assignee: United States Department of the Air Force
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Filing: 1975-08-18
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Granted: 1976-10-19
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Expires: 1995-08-18
Abstract
Abstract An apertured metallic ground plate antenna element having a high input impedance is driven from a lower impedance input transmission line by means of an exciter that provides broadband impedance transformation. The input transmission line is divided into two higher impedance feed lines that feed two parallel plate transmission lines. The parallel plate transmission lines are positioned in close proximity to the element aperture and are oriented to provide antenna excitation in series.
Inventors
- 👤 Alfred R. Lopez
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 15:36
CPC Classifications
H; H01; H01Q; H01Q13/00; H01Q13/02; H01Q13/10; H01Q13/18
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
93 words
In combination with an antenna element consisting of a metallic ground plate having an aperture therein, a balanced exciter comprising first and second parallel plate transmission lines disposed in close proximity to said aperture, a coaxial cable input transmission line, and means bifurcating said coaxial cable input transmission line into first and second coaxial cable feed transmission lines, said first coaxial cable feed transmission line being connected to energize said first parallel plate transmission line and said second coaxial cable feed transmission line being connected to energize said second parallel plate transmission line.
Claim 2
Dependent Claim
93 words
In combination with an antenna element consisting of a metallic ground plate having an aperture therein, a balanced exciter comprising first and second parallel plate transmission lines disposed in close proximity to said aperture, a coaxial cable input transmission line, and means bifurcating said coaxial cable input transmission line into first and second coaxial cable feed transmission lines, said first coaxial cable feed transmission line being connected to energize said first parallel plate transmission line and said second coaxial cable feed transmission line being connected to energize said second parallel plate transmission line.
Claim 3
Dependent Claim
27 words
A balanced exciter as defined in claim 1 wherein said first and second parallel plate transmission lines are oriented to provide series excitation of said antenna element.
Claim 4
Dependent Claim
36 words
A balanced exciter as defined in claim 2 wherein the impedance of each said feed transmission line is approximately one-half the impedance of said antenna element and approximately twice the impedance of said input transmission line.
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) | 1979-10-19 | 1980-04-19 | 1980-10-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-10-19 | 1984-04-19 | 1984-10-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-10-19 | 1988-04-19 | 1988-10-19 | $7700.00 | Window Closed / Lapsed |