US3932873A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Shortened aperture dipole antenna
Assignee: RCA Corp
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Filing: 1974-09-20
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Granted: 1976-01-13
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Expires: 1994-09-20
Abstract
Abstract A center fed dipole with a shortened aperture is described. A first rod-like radiator element approximately a quarter wavelength long at the center operating frequency of the antenna is coupled to the inner conductor of a coaxial transmission line. A second radiator element includes a hollow-conductive cylinder, coaxial with the coaxial transmission line, and a coil. The conductive cylinder is substantially less than a quarter wavelength long at the center operating frequency of the antenna. The conductive cylinder is coupled at one end to the outer conductor of the coaxial transmission line and the end of the cylinder remote from the one end is coupled to the coil.
Inventors
- 👤 Arthur Garcia
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 21:01
CPC Classifications
H; H01; H01Q; H01Q9/00; H01Q9/04; H01Q9/16
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
132 words
A center fed dipole antenna adapted to operate over a given range of frequencies comprising: a coaxial transmission line, a first antenna radiator element connected at one end thereof to the inner conductor of said coaxial transmission line at an end of said coaxial transmission line, a second antenna radiator element including a hollow cylinder of conductive material and a coil, said hollow cylinder being coaxial with said coaxial transmission line and being electrically connected at an end to the outer conductor of said coaxial transmission line at said end of said coaxial transmission line, said cylinder being electrically connected at its other end to said coil and a cylindrical sleeve of conductive material spaced from said hollow cylinder and closely spaced coaxial with and about a substantial portion of said coil.
Claim 2
Dependent Claim
132 words
A center fed dipole antenna adapted to operate over a given range of frequencies comprising: a coaxial transmission line, a first antenna radiator element connected at one end thereof to the inner conductor of said coaxial transmission line at an end of said coaxial transmission line, a second antenna radiator element including a hollow cylinder of conductive material and a coil, said hollow cylinder being coaxial with said coaxial transmission line and being electrically connected at an end to the outer conductor of said coaxial transmission line at said end of said coaxial transmission line, said cylinder being electrically connected at its other end to said coil and a cylindrical sleeve of conductive material spaced from said hollow cylinder and closely spaced coaxial with and about a substantial portion of said coil.
Claim 3
Dependent Claim
16 words
The combination claimed in claim 1 wherein said first radiator element is an elongated rod-like conductor.
Claim 4
Dependent Claim
18 words
The combination claimed in claim 1 wherein said first and second elements operate as quarter wavelength resonant elements.
Claim 5
Dependent Claim
15 words
The combination claimed in claim 1, including conductive whiskers extending orthogonally from said cylindrical sleeve.
Claim 6
Dependent Claim
17 words
The combination claimed in claim 1, including conductive whiskers extending orthogonal to said sleeve from said coil.
Claim 7
Dependent Claim
14 words
The combination claimed in claim 1 wherein said cylinder is made of braided wire.
Claim 8
Dependent Claim
24 words
The combination claimed in claim 1 wherein said cylinder is at least 1/9th wavelength long at a frequency within said given range of frequencies.
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) | 1979-01-12 | 1979-07-14 | 1980-01-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-01-12 | 1983-07-14 | 1984-01-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-01-12 | 1987-07-14 | 1988-01-13 | $7700.00 | Window Closed / Lapsed |