US3596273A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Multielement radio-frequency antenna structure having helically coiled conductive elements
Assignee: Individual
•
Filing: 1967-09-25
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Granted: 1971-07-27
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Expires: 1987-09-25
Abstract
Abstract A multielement antenna structure is provided which may be fabricated with a predetermined characteristic impedance for impedance matching purposes. The several elements comprise elongated electrical conductors formed in a helix and encased in a supporting body formed from a hardenable resin matrix. A broadband frequency characteristic is obtained through appropriate selection of conductor diameters that will result in resonance of the several conductors at different respective frequencies within the design frequency band.
Inventors
- 👤 Richard J Francis
- 👤 Clara A Francis
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 09:53
CPC Classifications
H; H01; H01Q; H01Q1/00; H01Q1/36; H01Q1/362
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
125 words
A radio-frequency antenna structure comprising at least two elongated, electrically conductive elements disposed in the same plane 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 and being electrically connected together at only one end thereof, which end forms a feed point, said elements being of selected cross-sectional area and relatively spaced to provide a desired characteristic impedance, and 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.
Claim 2
Dependent Claim
125 words
A radio-frequency antenna structure comprising at least two elongated, electrically conductive elements disposed in the same plane 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 and being electrically connected together at only one end thereof, which end forms a feed point, said elements being of selected cross-sectional area and relatively spaced to provide a desired characteristic impedance, and 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.
Claim 3
Dependent Claim
23 words
An r-f antenna structure according to claim 1 wherein helical spacing of said conductive element groups is of the order of one-sixteenth inch.
Claim 4
Dependent Claim
29 words
An r-f antenna structure according to claim 1 wherein said electrically conductive elements are of dissimilar cross-sectional area to provide a relatively greater effective band width of operating frequencies.
Claim 5
Dependent Claim
28 words
An r-f antenna structure according to claim 1 wherein said electrically conductive elements are of dissimilar lengths to provide a relatively greater effective band width of operating frequencies.
Claim 6
Dependent Claim
22 words
An r-f antenna structure according to claim 1 having a core formed from a material with a magnetic permeability greater than unity.
Claim 7
Dependent Claim
57 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 fiberglass.
Claim 8
Dependent Claim
16 words
An r-f antenna structure according to claim 6 wherein said synthetic resin is a thermosetting polyester.
Claim 9
Dependent Claim
15 words
An r-f antenna structure according to claim 6 wherein said synthetic resin is an epoxy.
Claim 10
Dependent Claim
25 words
An r-f antenna structure according to claim 6 in which said fiber glass strands are distributed through the core and sheath of said resin matrix.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-07-26 | 1975-01-25 | 1975-07-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-07-26 | 1979-01-25 | 1979-07-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-07-26 | 1983-01-25 | 1983-07-27 | $7700.00 | Window Closed / Lapsed |