US3605097A
Expired / Lapsed
US
⏱️ 0.0 years remaining
End-loaded filament antenna
Assignee: Singer Co
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Filing: 1969-07-14
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Granted: 1971-09-14
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Expires: 1989-07-14
Abstract
Abstract This invention relates to an electrically small antenna having a directional radiation pattern. The invention is physically embodied as a small filament, extending upwardly from a ground plane into connection with the top of a small passive resistor in turn extending downwardly to the ground plane. This filament lies in a single plane and produces linearly polarized radiation in such plane, with maximum radiation in a predetermined direction in such plane and elliptically polarized radiation in other planes but still with maximum radiation in a single direction.
Inventors
- 👤 Endre B Hadik-Barkoczy
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 04:33
CPC Classifications
H; H01; H01Q; H01Q9/00; H01Q9/04; H01Q9/30; H01Q9/42
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
115 words
An improved filament antenna comprising: a. means defining a ground plane, b. an electrically small filament having a length in the range of 0.05 to 0.20 free-space wavelength of the shortest wavelength of radiation propagated or received by the antenna, c. a small passive resistor connecting one end of said filament to said ground plane, and d. feed means engaging the other end of said filament in the vicinity of said ground plane for passing a current through said filament, said filament extending upwardly from said ground plane to said resistor in a single principal plane for establishment of a radiation beam having a maximum in the principal plane and tilted away from the resistor.
Claim 2
Dependent Claim
115 words
An improved filament antenna comprising: a. means defining a ground plane, b. an electrically small filament having a length in the range of 0.05 to 0.20 free-space wavelength of the shortest wavelength of radiation propagated or received by the antenna, c. a small passive resistor connecting one end of said filament to said ground plane, and d. feed means engaging the other end of said filament in the vicinity of said ground plane for passing a current through said filament, said filament extending upwardly from said ground plane to said resistor in a single principal plane for establishment of a radiation beam having a maximum in the principal plane and tilted away from the resistor.
Claim 3
Dependent Claim
41 words
The antenna of claim 1 further defined by said feed means engaging said filament at a distance along the ground plane from the electrical connection of resistor and ground plane, whereby said filament extends along said ground plane and spaced therefrom.
Claim 4
Dependent Claim
26 words
The antenna of claim 1 further defined by said fiLament having a length substantially equal to 0.10 wavelength at the highest operating frequency of the antenna.
Claim 5
Dependent Claim
25 words
The antenna structure of claim 1 further defined by said filament extending no further from the ground plane than the height of the passive resistor.
Claim 6
Dependent Claim
60 words
The antenna of claim 1 further defined by said filament having a first section extending substantially perpendicularly to said ground plane and a second contiguous section extending substantially parallel to said ground plane into connection with the top of said resistor and the length of the second section being substantially twice as long as the length of the first section.
Claim 7
Dependent Claim
26 words
The antenna of claim 1 having the filament thereof inclined with respect to said ground plane from the feed means to the top of said resistor.
Claim 8
Dependent Claim
152 words
An improved directional antenna comprising means defining an electrically conducting ground plane, an L-shaped radiator having a total length no greater than 0.20 wavelength and contiguous first and second sections substantially perpendicular to each other, means defining a feed point at said ground plane and engaging the ground plane and engaging a first section of said radiator out of contact with the ground plane for applying energization between radiator and ground plane, said radiator having the first section extending substantially normal to the ground plane at the feed point and the second section substantially parallel to the ground plane, and an end-loading resistor connected to said ground plane and extending therefrom into connection with the free end of the second section of said radiator in the plane of said radiator, whereby said antenna has a radiation pattern with a maximum in the plane of the radiator and directed away from said resistor.
Claim 9
Dependent Claim
152 words
An improved directional antenna comprising means defining an electrically conducting ground plane, an L-shaped radiator having a total length no greater than 0.20 wavelength and contiguous first and second sections substantially perpendicular to each other, means defining a feed point at said ground plane and engaging the ground plane and engaging a first section of said radiator out of contact with the ground plane for applying energization between radiator and ground plane, said radiator having the first section extending substantially normal to the ground plane at the feed point and the second section substantially parallel to the ground plane, and an end-loading resistor connected to said ground plane and extending therefrom into connection with the free end of the second section of said radiator in the plane of said radiator, whereby said antenna has a radiation pattern with a maximum in the plane of the radiator and directed away from said resistor.
Claim 10
Dependent Claim
40 words
The antenna of claim 7 further defined by the relationship 2l/d Cos h (R/120) wherein l is the length of said second section, d is the diameter of the filament and R is the resistance value of the end-loading resistor.
Claim 11
Dependent Claim
103 words
An improved filamentary directional antenna comprising means defining a ground plane, a filamentary radiation having a first portion extending from said ground plane and a contiguous second portion of length extending along the ground plane out of contact therewith, and an end-loading impedance of resistance R connected between said ground plane and the free end of said second radiator portion, with the relationship between filament parameters being substantially defined by the relationship: wherein d is the filament diameter, l is the filament length, gamma is the medium impedance of the atmosphere surrounding the antenna and Rho is the reflection coefficient of the antenna.
Claim 12
Dependent Claim
103 words
An improved filamentary directional antenna comprising means defining a ground plane, a filamentary radiation having a first portion extending from said ground plane and a contiguous second portion of length extending along the ground plane out of contact therewith, and an end-loading impedance of resistance R connected between said ground plane and the free end of said second radiator portion, with the relationship between filament parameters being substantially defined by the relationship: wherein d is the filament diameter, l is the filament length, gamma is the medium impedance of the atmosphere surrounding the antenna and Rho is the reflection coefficient of the antenna.
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) | 1974-09-13 | 1975-03-15 | 1975-09-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-09-13 | 1979-03-15 | 1979-09-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-09-13 | 1983-03-15 | 1983-09-14 | $7700.00 | Window Closed / Lapsed |