Patent US3576578A successfully refreshed from Google Patents.
US3576578A
Expired / Lapsed
US
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Dipole antenna in which one radiating element is formed by outer conductors of two distinct transmission lines having different characteristic impedances
Assignee: GTE Sylvania Inc
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Filing: 1967-11-30
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Granted: 1971-04-27
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Expires: 1987-11-30
Abstract
Abstract One half of a dipole antenna is formed by the extension of a center conductor of a coaxial transmission line beyond the point of termination of the outer conductor at the feed point of the dipole. The other half of the dipole is formed by the outer conductor between a broadband cable choke and the feed point. The part of the antenna between the choke and feed point comprises two coaxial lines, one having a characteristic impedance equal to that of the antenna feed line and the other having a characteristic impedance greater than that of the feed line.
Inventors
- 👤 Ernest T Harper
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 16:48
CPC Classifications
H; H01; H01Q; H01Q9/00; H01Q9/04; H01Q9/16; H01Q9/18
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
127 words
A broadband end-fed dipole antenna having two dipole elements, comprising: first and second coaxial transmission lines electrically connected together, each of said lines having an inner conductor and an outer conductor, the outer conductor of said first line and at least part of the outer conductor of said second line constituting one of said dipole elements, the other of said dipole elements comprising an extension of the inner conductor of said first line, feed line means for energizing said dipole elements, and a broadband choke operatively coupling said feed line means with said second line, the characteristic impedance of the first line being greater than that of the second line and the characteristic impedance of the second line being equal to that of the feed line means.
Claim 2
Dependent Claim
127 words
A broadband end-fed dipole antenna having two dipole elements, comprising: first and second coaxial transmission lines electrically connected together, each of said lines having an inner conductor and an outer conductor, the outer conductor of said first line and at least part of the outer conductor of said second line constituting one of said dipole elements, the other of said dipole elements comprising an extension of the inner conductor of said first line, feed line means for energizing said dipole elements, and a broadband choke operatively coupling said feed line means with said second line, the characteristic impedance of the first line being greater than that of the second line and the characteristic impedance of the second line being equal to that of the feed line means.
Claim 3
Dependent Claim
78 words
The antenna according to claim 1 in which said feed line means and said second line comprise different portions of the same coaxial cable, said choke comprising a magnetically permeable core with a predetermined length of said coaxial cable wound therearound and having an inductance resonant with the self-capacitance between cable windings at the center operating frequency of the antenna, having a large inductance-to-capacitance ratio, and providing a large impedance at the center frequency and frequencies spaced therefrom.
Claim 4
Dependent Claim
61 words
The antenna according to claim 5 wherein said first line has an electrical length substantially equal to a quarter wavelength at the resonant frequency of said antenna, said first line having a physical length satisfying the relationship where vp is the phase velocity of signals in said first line and lambda is the waVelength at the resonant frequency of said dipole.
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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) | 1974-04-26 | 1974-10-26 | 1975-04-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-04-26 | 1978-10-26 | 1979-04-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-04-26 | 1982-10-26 | 1983-04-27 | $7700.00 | Window Closed / Lapsed |