Patent US4148030A successfully refreshed from Google Patents.
US4148030A
Expired / Lapsed
US
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Helical antennas
Assignee: Lockheed Martin Corp
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Filing: 1977-06-13
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Granted: 1979-04-03
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Expires: 1997-06-13
Abstract
Abstract A plurality of coaxially wound, untuned helical antennas have a pitch that is a function of displacement along the axis of the antennas. The untuned antennas may be excited by signals that have a selected phase shift therebetween. The excitation causes an additive combining of electromagnetic waves radiated by the untuned antennas. The helical antennas may be tuned to radiate the waves in respective bands of frequencies, thereby simultaneously providing filtering and radiation characteristics that make the tuned antennas suitable for frequency diplexing.
Inventors
- 👤 Peter Foldes
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 11:29
CPC Classifications
H; H01; H01Q; H01Q1/00; H01Q1/36; H01Q1/362; H01Q11/00; H01Q11/02; H01Q11/08
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
115 words
An antenna comprising: a pliable, electrically insulating substrate in the form of a sheet; a first group of coupled metal resonating elements deposited upon said sheet to define a first spiral, said elements resonating at frequencies within a first pass band; a second group of coupled metal resonating elements fixedly disposed upon said sheet to define a second spiral, said elements resonating at frequencies within a second pass band; and a cylindrical insulator having one end that is adapted for connection to a surface of an electrically conductive ground plate, said sheet being wound on said cylindrical insulator to cause said first and second groups of resonating elements to define first and second helixes, respectively.
Claim 2
Dependent Claim
115 words
An antenna comprising: a pliable, electrically insulating substrate in the form of a sheet; a first group of coupled metal resonating elements deposited upon said sheet to define a first spiral, said elements resonating at frequencies within a first pass band; a second group of coupled metal resonating elements fixedly disposed upon said sheet to define a second spiral, said elements resonating at frequencies within a second pass band; and a cylindrical insulator having one end that is adapted for connection to a surface of an electrically conductive ground plate, said sheet being wound on said cylindrical insulator to cause said first and second groups of resonating elements to define first and second helixes, respectively.
Claim 3
Dependent Claim
14 words
The antenna of claim 1, wherein said resonating elements comprise a plurality of dipoles.
Claim 4
Dependent Claim
40 words
The antenna of claim 1, wherein said resonating elements comprise a plurality of rectangular metal strips disposed upon both surfaces of said sheet with strips on one surface of said sheet overlapping strips on the other surface of said sheet.
References Cited (Backward Citations)
US2633532A
Cited
US2503010A
Cited
DE1132607B
Cited
DE1183143B
Cited
US3503075A
Cited
US3573840A
Cited
US3906509A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1982-04-02 | 1982-10-02 | 1983-04-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-04-02 | 1986-10-02 | 1987-04-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-04-02 | 1990-10-02 | 1991-04-03 | $7700.00 | Window Closed / Lapsed |