US3737910A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Multielement radio-frequency antenna structure having helically coiled conductive elements
Assignee: Individual
•
Filing: 1971-07-26
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Granted: 1973-06-05
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Expires: 1991-07-26
Abstract
Abstract A multielement antenna for radio frequency transmission is provided having a plurality of helically formed, electrically conductive elements disposed in coaxial, longitudinally extending relationship that are structurally supported and protectively encased in a dielectric material comprising a fiber-glassreinforced synthetic resin matrix. Coupling of the helical elements through a coaxial cable to associated electronic equipment is effected by a helical conductor disposed in electromagnetically coupled relatioship to the conductive elements and which is also physically supported by a similar dielectric material reinforced with fiber glass.
Inventors
- 👤 R Francis
- 👤 C Francis
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 12:13
CPC Classifications
H; H01; H01Q; H01Q1/00; H01Q1/36; H01Q1/362
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
132 words
A radio-frequency antenna structure comprising an antenna element including at least two elongated, electrically-conductive elements disposed in side-by-side relationship and formed into respective cylindrical helixes of the same pitch and internal diameter, each of said elements being electrically insulated from the other throughout the length thereof, said elements being of dissimilar leNgths and cross-sectional area and relatively spaced to provide a desired antenna impedance, a supporting body structure for said electrically conductive elements formed from a dielectric having a relatively low loss characteristic as to electromagnetic wave energy and physical strength characteristics to maintain the physical configuration of the conductive elements and assure structural integrity of the antenna structure, and a coupling element disposed in electromagnetically coupled relationship to said conductive elements and including at least one helically wound, electrically conductive element.
Claim 2
Dependent Claim
132 words
A radio-frequency antenna structure comprising an antenna element including at least two elongated, electrically-conductive elements disposed in side-by-side relationship and formed into respective cylindrical helixes of the same pitch and internal diameter, each of said elements being electrically insulated from the other throughout the length thereof, said elements being of dissimilar leNgths and cross-sectional area and relatively spaced to provide a desired antenna impedance, a supporting body structure for said electrically conductive elements formed from a dielectric having a relatively low loss characteristic as to electromagnetic wave energy and physical strength characteristics to maintain the physical configuration of the conductive elements and assure structural integrity of the antenna structure, and a coupling element disposed in electromagnetically coupled relationship to said conductive elements and including at least one helically wound, electrically conductive element.
Claim 3
Dependent Claim
20 words
An r-f antenna structure according to claim 1 wherein said coupling element is coaxially disposed relative to said conductive elements.
Claim 4
Dependent Claim
41 words
An r-f antenna structure according to claim 1 wherein said coupling element comprises at least two electrically conductive elements formed into respective cylindrical helixes with the two elements electrically insulated from each other throughout their length with terminal ends electrically interconnected.
Claim 5
Dependent Claim
18 words
An r-f antenna structure according to claim 1 wherein said coupling element is encased within a dielectric material.
Claim 6
Dependent Claim
22 words
An r-f antenna structure according to claim 1 wherein said coupling element is disposed in spaced parallel relationship to said antenna element.
Claim 7
Dependent Claim
46 words
An r-f antenna structure according to claim 1 wherein said coupling element comprises a plurality of electrically conductive elements formed into a cylindrical helix and having two connector leads electrically connected thereto at longitudinally spaced points with the coupling element disposed parallel to said antenna element.
Claim 8
Dependent Claim
23 words
An r-f antenna structure according to claim 1 comprising a pair of said antenna elements disposed in laterally spaced electromagnetically coupled, parallel relationship.
Claim 9
Dependent Claim
22 words
An r-f antenna structure according to claim 7 wherein said coupling element is coaxially disposed relative to both of said antenna elements.
Claim 10
Dependent Claim
31 words
An r-f antenna structure according to claim 7 wherein said antenna elements are mechanically secured together in fixed relationship at their mid-point and are relatively flexible at their free end portions.
Claim 11
Dependent Claim
39 words
An r-f antenna structure according to claim 7 wherein said antenna elements are of different lengths and the coupling element is disposed more closely adjacent to the one of said antenna elements which is relatively longer than the other.
Claim 12
Dependent Claim
58 words
An r-f antenna structure according to claim 1 wherein said supporting structure is a fiber glass reinforced, synthetic resin matrix having a central core around which said electrically conductive elements are helically wound and an outer sheath in which said core and conductive elements are encased, said structure including a multiplicity of longitudinally extending strands of fiber glass.
Claim 13
Dependent Claim
16 words
An r-f antenna structure according to claim 11 wherein said synthetic resin is a thermosetting polyester.
Claim 14
Dependent Claim
15 words
An r-f antenna structure according to claim 11 wherein said synthetic resin is an epoxy.
Claim 15
Dependent Claim
25 words
An r-f antenna structure according to claim 11 in which said fiber glass strands are distributed through the core and sheath of said resin matrix.
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) | 1976-06-04 | 1976-12-04 | 1977-06-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-06-04 | 1980-12-04 | 1981-06-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-06-04 | 1984-12-04 | 1985-06-05 | $7700.00 | Window Closed / Lapsed |