US3745585A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Broadband plane antenna with log-periodic reflectors
Assignee: GTE Sylvania Inc
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Filing: 1972-03-29
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Granted: 1973-07-10
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Expires: 1992-03-29
Abstract
Abstract A broadband unidirectional linear or circularly polarized plane antenna with or without reflecting cavity is constructed with a plurality of log-periodically related reflecting rings or bands stacked behind the antenna elements symmetrically of the antenna axis. The conductive rings reflect backwardly directed radiation and comprise the exposed peripheral portions of a series of stacked plates, the dimensions and spacings of which increase progressively in increments of a predetermined ratio from a minimum adjacent the antenna elements to a maximum remote from the elements. In order to prevent the formation of an electromagnetic field in the spaces between axially aligned portions of the plates, field arresting material is located in these spaces.
Inventors
- 👤 N Barbano
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 21:46
CPC Classifications
H; H01; H01Q; H01Q1/00; H01Q1/36; H01Q13/00; H01Q13/10; H01Q13/18; H01Q19/00; H01Q19/10; H01Q9/00; H01Q9/04; H01Q9/16; H01Q9/26; H01Q9/27
Claims Analysis
Total Claims: 19
Claim 1
Independent Claim
79 words
In a plane unidirectional antenna having centerfed radiators in a common plane and a beam axis normal to said plane, the improvement of a plurality of stacked axially spaced reflectors supported transversely of an extension of said beam axis adjacent one side of said radiators, said reflectors being parallel to said plane and having transverse dimensions which increase in increments of a predetermined ratio with distance from said radiators, the spaces between adjacent reflectors containing electromagnetic field inhibiting material.
Claim 2
Dependent Claim
79 words
In a plane unidirectional antenna having centerfed radiators in a common plane and a beam axis normal to said plane, the improvement of a plurality of stacked axially spaced reflectors supported transversely of an extension of said beam axis adjacent one side of said radiators, said reflectors being parallel to said plane and having transverse dimensions which increase in increments of a predetermined ratio with distance from said radiators, the spaces between adjacent reflectors containing electromagnetic field inhibiting material.
Claim 3
Dependent Claim
51 words
The antenna according to claim 1 with a dielectric disk for each reflector, each of said reflectors being formed as a conductive ring on the side of said disk facing said radiators, said material being applied as a layer to the portion of said side of the disk within said ring.
Claim 4
Dependent Claim
81 words
A plane unidirectional antenna comprising a plurality of radiators in a common plane symmetrically disposed about an axis normal to said plane, means for coupling electromagnetic wave signalS to and from said radiators, a plurality of coaxially disposed axially spaced plates adjacent to one side of said radiators, the transverse dimensions of said plates increasing progressively in increments of a predetermined ratio with an increase in distance from said radiators, and electric field arresting material between overlapping portions of said plates.
Claim 5
Dependent Claim
81 words
A plane unidirectional antenna comprising a plurality of radiators in a common plane symmetrically disposed about an axis normal to said plane, means for coupling electromagnetic wave signalS to and from said radiators, a plurality of coaxially disposed axially spaced plates adjacent to one side of said radiators, the transverse dimensions of said plates increasing progressively in increments of a predetermined ratio with an increase in distance from said radiators, and electric field arresting material between overlapping portions of said plates.
Claim 6
Dependent Claim
29 words
The antenna according to claim 3 in which said radiators comprise linearly polarized log periodic sections, the spacing between adjacent plates increasing log periodically with distance from said radiators.
Claim 7
Dependent Claim
34 words
The antenna according to claim 3 in which each of said radiators is configured in the shape of an equiangular spiral, the spacing between adjacent plates increasing log periodically with distance from said radiators.
Claim 8
Dependent Claim
95 words
A plane unidirectional antenna comprising a pair of plane radiators symmetrically disposed about an axis normal to the plane of the radiators, a pair of balanced feed lines connected to said radiators proximate to said axis, a coaxial post containing said feed lines, and a plurality of circular reflector elements supported on said post and axially aligned with said radiators whereby to produce a unidirectional radiation pattern, said elements being axially spaced along said post and having dimensions parallel to said radiators increasing in increments of a predetermined ratio with axial distance from the radiators.
Claim 9
Dependent Claim
95 words
A plane unidirectional antenna comprising a pair of plane radiators symmetrically disposed about an axis normal to the plane of the radiators, a pair of balanced feed lines connected to said radiators proximate to said axis, a coaxial post containing said feed lines, and a plurality of circular reflector elements supported on said post and axially aligned with said radiators whereby to produce a unidirectional radiation pattern, said elements being axially spaced along said post and having dimensions parallel to said radiators increasing in increments of a predetermined ratio with axial distance from the radiators.
Claim 10
Dependent Claim
14 words
The antenna according to claim 6 with a conductive cup enclosing said reflector elements.
Claim 11
Dependent Claim
41 words
The antenna according to claim 6 in which said reflector elements comprise conductive rings, the inner diameter of the larger of a pair of adjacent rings being substantially the same as the outer diameter of the smaller ring of said pair.
Claim 12
Dependent Claim
76 words
In a plane unidirectional antenna having center-fed radiators in a common plane and a beam axis normal to said plane, the improvement of a plurality of stacked circular reflectors supported transversely of an extension of said beam axis adjacent one side of radiators, said reflectors being axially spaced from each other and parallel to said plane and having transverse dimensions and interreflector spacings which increase in increments of a predetermined ratio with distance from said radiators.
Claim 13
Dependent Claim
76 words
In a plane unidirectional antenna having center-fed radiators in a common plane and a beam axis normal to said plane, the improvement of a plurality of stacked circular reflectors supported transversely of an extension of said beam axis adjacent one side of radiators, said reflectors being axially spaced from each other and parallel to said plane and having transverse dimensions and interreflector spacings which increase in increments of a predetermined ratio with distance from said radiators.
Claim 14
Dependent Claim
119 words
A plane unidirectional antenna comprising a pair of plane radiators symmetrically disposed about an axis normal to the plane of the radiators, a pair of balanced feed lines connected to said radiators proximate to said axis, a coaxial post containing said feed lines, and a plurality of reflector elements supported on said post and axially aligned with said radiators whereby to produce a unidirectional radiation pattern, said elements being axially spaced along said post and having dimensions parallel to said radiators increasing log periodically with axial distance from the radiators, each of certain of said reflector elements comprising a peripheral conductive ring on a plate, the space between axially overlapping portions of adjacent plates containing electromagnetic field inhibiting material.
Claim 15
Dependent Claim
119 words
A plane unidirectional antenna comprising a pair of plane radiators symmetrically disposed about an axis normal to the plane of the radiators, a pair of balanced feed lines connected to said radiators proximate to said axis, a coaxial post containing said feed lines, and a plurality of reflector elements supported on said post and axially aligned with said radiators whereby to produce a unidirectional radiation pattern, said elements being axially spaced along said post and having dimensions parallel to said radiators increasing log periodically with axial distance from the radiators, each of certain of said reflector elements comprising a peripheral conductive ring on a plate, the space between axially overlapping portions of adjacent plates containing electromagnetic field inhibiting material.
Claim 16
Dependent Claim
51 words
The antenna according to claim 10 in which said plates are formed of a dielectric substance and each of said rings comprises a conductive layer on the surface of one of said plates facing said radiators, said field inhibiting material being disposed as a layer on said plate within said ring.
Claim 17
Dependent Claim
56 words
In a plane unidirectional antenna having center-fed radiators in a common plane and a beam axis normal to said plane, the improvement of a plurality of stacked axially spaced reflectors supported transversely of an extension of said beam axis adjacent one side of said radiators, the spaces between adjacent reflectors containing an electromagnetic field inhibiting material.
Claim 18
Dependent Claim
56 words
In a plane unidirectional antenna having center-fed radiators in a common plane and a beam axis normal to said plane, the improvement of a plurality of stacked axially spaced reflectors supported transversely of an extension of said beam axis adjacent one side of said radiators, the spaces between adjacent reflectors containing an electromagnetic field inhibiting material.
Claim 19
Dependent Claim
21 words
The antenna according to claim 12 in which each of said radiators is configured in the shape of an Archimedes spiral.
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) | 1976-07-09 | 1977-01-08 | 1977-07-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-07-09 | 1981-01-08 | 1981-07-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-07-09 | 1985-01-08 | 1985-07-10 | $7700.00 | Window Closed / Lapsed |