Patent US4309707A successfully refreshed from Google Patents.
US4309707A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Radio antennae structures employing helical conductors
Assignee: National Research Development Corp UK
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Filing: 1980-04-29
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Granted: 1982-01-05
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Expires: 2000-04-29
Abstract
Abstract The invention relates to compact radio antennae structures having wide bandwidth characteristics, the antennae structure including a plurality of end-fed antennae, and a terminal connected to end feed the antennae, wherein each of the antennae comprise a pair of extended conductors disposed in helical insulated windings of the same diameter and opposite chirality, the windings being coaxially, longitudinally coextensive and connected together at one end to form said end-feed, and wherein the antennae are each of different electrical lengths.
Inventors
- 👤 James R. James
- 👤 William James
- 👤 Robert J. Drewett
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 15:11
CPC Classifications
H; H01; H01Q; H01Q1/00; H01Q1/36; H01Q5/00; H01Q5/30; H01Q5/307; H01Q5/342; H01Q5/357; H01Q5/364; H01Q5/371
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
68 words
A radio antenna structure including a plurality of end-fed antennae, and a terminal connected to end feed said antennae, wherein each of said antennae comprise a pair of extended conductors disposed in helical insulated windings of the same diameter and opposite chirality, said winds being coaxial, longitudinally coextensive and connected together at one end to form said end-feed, and wherein the antennae are each of different electrical lengths.
Claim 2
Dependent Claim
68 words
A radio antenna structure including a plurality of end-fed antennae, and a terminal connected to end feed said antennae, wherein each of said antennae comprise a pair of extended conductors disposed in helical insulated windings of the same diameter and opposite chirality, said winds being coaxial, longitudinally coextensive and connected together at one end to form said end-feed, and wherein the antennae are each of different electrical lengths.
Claim 3
Dependent Claim
20 words
A radio antenna structure as in claim 1 wherein said antennae have coplanar axes which diverge outwardly from said terminal.
Claim 4
Dependent Claim
17 words
A radio antenna as in claim 2 wherein said axes diverge at an angle of about 30°.
Claim 5
Dependent Claim
14 words
A radio antenna structure as in claim 1 wherein said antennae have parallel axes.
References Cited (Backward Citations)
US2153975A
Cited
US2966678A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1985-01-04 | 1985-07-06 | 1986-01-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-01-04 | 1989-07-06 | 1990-01-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-01-04 | 1993-07-06 | 1994-01-05 | $7700.00 | Window Closed / Lapsed |