Patent US1090948A successfully refreshed from Google Patents.
US3671972A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Adjustable center loaded antenna arrangement
Assignee: Individual
•
Filing: 1970-01-07
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Granted: 1972-06-20
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Expires: 1990-01-07
Abstract
Abstract A center-loaded antenna arrangement having a fixed loading coil in a whip antenna, and a tuning core mounted for movement through and out of the coil, said core having a ferrous section and an inductor ring section. Suitable connecting means connects an end of the coil to a radio ground and to a radio transmitter or receiver through a R.F. transmission line. This connecting means is preferably connected to the radio ground through an impedance matching device which couples the coil to the transmitter or receiver.
Inventors
- 👤 Ashton James Spilsbury
- 👤 Oswald Thorkelson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 03:34
CPC Classifications
H; H01; H01Q; H01Q9/00; H01Q9/04; H01Q9/30
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
137 words
An adjustable center-loaded whip antenna arrangement comprising a hollow antenna; a loading coil fixedly mounted in the antenna; and a tuning core mounted for movement through and out of the coil, said core comprising means, comprising a high permeability ferrous section and an inductor ring section, for providing a decrease in the Q of the loading coil with an increase in the tuning frequency of the coil such that a substantially constant radio frequency antenna base resistance is provided over a wide frequency range; the inboardmost end of said ferrous section lying directly adjacent to the inboardmost end of said inductor ring section and the spacing between the outer diameter of the inductor ring section and the inner diameter of the loading coil being a minimum consistent with the necessary insulation required between the core and coil.
Claim 2
Dependent Claim
137 words
An adjustable center-loaded whip antenna arrangement comprising a hollow antenna; a loading coil fixedly mounted in the antenna; and a tuning core mounted for movement through and out of the coil, said core comprising means, comprising a high permeability ferrous section and an inductor ring section, for providing a decrease in the Q of the loading coil with an increase in the tuning frequency of the coil such that a substantially constant radio frequency antenna base resistance is provided over a wide frequency range; the inboardmost end of said ferrous section lying directly adjacent to the inboardmost end of said inductor ring section and the spacing between the outer diameter of the inductor ring section and the inner diameter of the loading coil being a minimum consistent with the necessary insulation required between the core and coil.
Claim 3
Dependent Claim
38 words
An antenna arrangement as claimed in claim 1 in which the inductor ring section of the core is made up of a plurality of coaxial inductor rings spaced from each other sufficiently to prevent a short circuit therebetween.
Claim 4
Dependent Claim
32 words
An antenna arrangement as claimed in claim 1 in which the ferrous section of the core is made up of a plurality of ferrous slugs resiliently held together as a flexible unit.
Claim 5
Dependent Claim
33 words
An antenna arrangement as claimed in claim 1, in which the ferrous section and the ring section of the core are both of such length that each may be in the coil alone.
Claim 6
Dependent Claim
29 words
An antenna arrangement as claimed in claim 1 in which the ferrous section and the ring section of the core are each substantially the same length as the coil.
Claim 7
Dependent Claim
49 words
An antenna arrangement as claimed in claim 1 in which the inductor ring section of the core is made up of a plurality of coaxial inductor rings spaced from each other sufficiently to prevent a short circuit therebetween; and said rings are not substantially longer than one diameter thereof.
Claim 8
Dependent Claim
64 words
An adjustable center-loaded antenna arrangement as claimed in claim 1 in which the inductor ring section of the core is made up of a plurality of coaxial inductor rings spaced from each other sufficiently to prevent a short circuit therebetween, and the ferrous section is made up of a plurality of ferrous slugs, said inductor rings and said ferrous slugs being resiliently held together.
Claim 9
Dependent Claim
83 words
An adjustable center-loaded antenna arrangement as claimed in claim 1 further comprising a coaxial R.F. transmission line for connecting an end of the coil to a radio frequency ground through an impedance matching device for coupling said coil to a radio transmitter or receiver, said impedance matching device comprising a capacitor connected at one side thereof to the center conductor of the coaxial line and to a conductor extending to the base of the coil, and at the other side thereof to ground.
Claim 10
Dependent Claim
38 words
An adjustable center-loaded antenna arrangement as claimed in claiM 8 in which said ground comprises a grounded base portion of the antenna, said other side of the capacitor being connected to the outer shielding of said coaxial line.
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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) | 1975-06-20 | 1975-12-20 | 1976-06-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-06-20 | 1979-12-20 | 1980-06-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-06-20 | 1983-12-20 | 1984-06-20 | $7700.00 | Window Closed / Lapsed |