Patent US4238800A successfully refreshed from Google Patents.
US4238800A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Whip antenna with capacitive loading
Assignee: BAE Systems Electronics Ltd
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Filing: 1979-01-25
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Granted: 1980-12-09
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Expires: 1999-01-25
Abstract
Abstract A whip antenna is constructed in three sections which screw together end-to-end to form the complete antenna. Each section comprises a flexible fibreglass rod which is surrounded by a sleeve of braided copper wire over a major part of its length, this sleeve serving to pass radio frequency current along the section during use of the antenna. One or more of the sections includes a capacitor or series connected capacitors connected in the radio frequency path along the antenna. Utilizing the fibreglass rod as a dielectric the capacitor electrodes are formed either by copper tape or conducting paint lying on the surface of the rod, the electrodes being digitally or helically intermeshed. Alternatively the electrodes may be formed as metallic rings surrounding the fibreglass rod and a conducting rod within the fibreglass rod.
Inventors
- 👤 Geoffrey T. Newington
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 22:05
CPC Classifications
H; H01; H01Q; H01Q9/00; H01Q9/04; H01Q9/30; H01Q1/00; H01Q1/08; H01Q1/085
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
125 words
A whip antenna comprising an elongated flexible solid core which is of electrically insulating material and which extends along a major part of the length of the antenna, a braided copper wire sleeve on the surface of said core and extending along a major part of the length of the core to provide the required radio frequency path along the antenna and a capacitor arrangement which is connected in said radio frequency path and which comprises at least two electrodes, a first one of said electrodes being embedded in said core and at least a second of said electrodes lying on the surface of and being carried by said core along part of its length and being out of electrical contact with said first electrode.
Claim 2
Dependent Claim
125 words
A whip antenna comprising an elongated flexible solid core which is of electrically insulating material and which extends along a major part of the length of the antenna, a braided copper wire sleeve on the surface of said core and extending along a major part of the length of the core to provide the required radio frequency path along the antenna and a capacitor arrangement which is connected in said radio frequency path and which comprises at least two electrodes, a first one of said electrodes being embedded in said core and at least a second of said electrodes lying on the surface of and being carried by said core along part of its length and being out of electrical contact with said first electrode.
Claim 3
Dependent Claim
29 words
A whip antenna according to claim 1 wherein said capacitor arrangement comprises a single capacitor, said first electrode being in direct electrical contact with the required radio frequency path.
Claim 4
Dependent Claim
87 words
A whip antenna according to claim 1 wherein said capacitor arrangement comprises two capacitors, said first electrode being common to said two capacitors and being out of electrical contact with the required radio frequency path one of said capacitors being formed by the first electrode and said second electrode and the other capacitor being formed by said first electrode and a further electrode lying on the surface of and being carried by the core, said further electrode being out of electrical contact with both said other electrodes.
Claim 5
Dependent Claim
35 words
A whip antenna according to claim 1, wherein said core is formed in at least two sections and there are provided means detachably to secure said sections to one another to form the complete antenna.
References Cited (Backward Citations)
US2715184A
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US3176298A
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US3541554A
Cited
US3945014A
Cited
US4160979A
Cited
US4148030A
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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) | 1983-12-09 | 1984-06-09 | 1984-12-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-12-09 | 1988-06-09 | 1988-12-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-12-09 | 1992-06-09 | 1992-12-09 | $7700.00 | Window Closed / Lapsed |