US3587106A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Broad band antennas having spiral windings
Assignee: General Dynamics Corp
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Filing: 1968-07-15
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Granted: 1971-06-22
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Expires: 1988-07-15
Abstract
Abstract A broad band antenna or feed for a parabolic reflector having a pair of spiral windings skewed with respect to the axis of a conical support surface on which they are wound in alternating relationship. Two such supports are rotatably mounted with their axes offset at an angle from the reflector axis so as to conically scan the target area. The feed achieves maximum illumination of the control portion of the reflector and provides a constant squint angle with respect to the reflector axis over a broad band of frequencies.
Inventors
- 👤 James W Crooks Jr
- 👤 Ray M Mcintyre Jr
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 19:26
CPC Classifications
H; H01; H01Q; H01Q11/00; H01Q11/02; H01Q11/08; H01Q11/083; H01Q3/00; H01Q3/12; H01Q3/16; H01Q3/18
Claims Analysis
Total Claims: 20
Claim 1
Independent Claim
89 words
An antenna comprising a. an electrically conductive element spirally wound to define a substantially conical surface having an axis, and b. at least those turns of said element having larger diameters being skewed with respect to said axis so as to depart from equiangular relationship with respect to the other turns of said element which are not so skewed, adjacent ones of said larger diameter turns which are disposed successively in a direction towards the apex of said conical surface being spaced from each other by progressively smaller distances.
Claim 2
Dependent Claim
89 words
An antenna comprising a. an electrically conductive element spirally wound to define a substantially conical surface having an axis, and b. at least those turns of said element having larger diameters being skewed with respect to said axis so as to depart from equiangular relationship with respect to the other turns of said element which are not so skewed, adjacent ones of said larger diameter turns which are disposed successively in a direction towards the apex of said conical surface being spaced from each other by progressively smaller distances.
Claim 3
Dependent Claim
28 words
The invention as set forth in claim 1 wherein the projection of said turns having larger diameters on a plane perpendicular to said axis is an elliptical spiral.
Claim 4
Dependent Claim
73 words
The invention as set forth in claim 1 including a reflector having an axis and a focal point spaced from said reflector along said reflector axis, said surface and said reflector being disposed on opposite sides of said focal point with said reflector axis at a predetermined angle to said surface axis whereby the direction of the radiation pattern of said turns of spirally wound element is substantially parallel to said reflector axis.
Claim 5
Dependent Claim
23 words
The invention as set forth in claim 3 including means for supporting said elements on said surface for rotation about said reflector axis.
Claim 6
Dependent Claim
87 words
The invention as set forth in claim 3 including a second electrically conductive element spirally wound identically with said first named conductive element except in an opposite sense to define a second substantially conical surface, the axis of said second surface being disposed in the same plane as said first surface axis and said reflector axis, said second surface axis and said first surface axis intersecting said reflector axis at the same point and making the same angle with said reflector axis as said first surface axis.
Claim 7
Dependent Claim
26 words
The invention as set forth in claim 5 including means for suppOrting said elements on said first and second surfaces for rotation about said reflector axis.
Claim 8
Dependent Claim
102 words
An antenna comprising first and second electrically conductive elements spirally interwound to define a substantially conical surface having an axis, at least those turns of said elements having larger diameters being skewed with respect to said axis so as to define a skew angle which is different from the skew angle of the remaining turns, the skew angle being defined as the angle formed by a first line connecting diametrically opposite points on turns of first and second elements which are adjacent to each other and a line perpendicular to the axis in the plane containing the axis and said first line.
Claim 9
Dependent Claim
102 words
An antenna comprising first and second electrically conductive elements spirally interwound to define a substantially conical surface having an axis, at least those turns of said elements having larger diameters being skewed with respect to said axis so as to define a skew angle which is different from the skew angle of the remaining turns, the skew angle being defined as the angle formed by a first line connecting diametrically opposite points on turns of first and second elements which are adjacent to each other and a line perpendicular to the axis in the plane containing the axis and said first line.
Claim 10
Dependent Claim
30 words
The invention as set forth in claim 7 including a transmission line having two conductors, connected respectively to said first and second elements at the apex of said conical surface.
Claim 11
Dependent Claim
26 words
The invention as set forth in claim 7 wherein all of the turns of said first and said second conductive elements have the same skewed relationship.
Claim 12
Dependent Claim
69 words
The invention as set forth in claim 7 wherein said first and second elements are so wound that the intersection of a first plane perpendicular to said axis and said surface defines a circle and a second plane intersecting said axis at the same point as said first plane and intersecting diametrically opposite points of adjacent ones of said first and second elements and said surface defines an ellipse.
Claim 13
Dependent Claim
110 words
A unidirectional antenna for providing a radiation pattern in a certain direction comprising a. a pair of windings spirally wound as to define a conical surface having an axis lying at a predetermined angle to said certain direction, and b. at least a plurality of those turns of said windings having the larger diameters being skewed with respect to said axis so that a plane perpendicular to said certain direction and intersecting diametrically opposite points on adjacent ones of said turns of different ones of said windings defining a squint angle with respect to said axis said squint angle being equal to the difference between 90* and said predetermined angle.
Claim 14
Dependent Claim
110 words
A unidirectional antenna for providing a radiation pattern in a certain direction comprising a. a pair of windings spirally wound as to define a conical surface having an axis lying at a predetermined angle to said certain direction, and b. at least a plurality of those turns of said windings having the larger diameters being skewed with respect to said axis so that a plane perpendicular to said certain direction and intersecting diametrically opposite points on adjacent ones of said turns of different ones of said windings defining a squint angle with respect to said axis said squint angle being equal to the difference between 90* and said predetermined angle.
Claim 15
Dependent Claim
50 words
The invention as set forth in claim 11 including a transmission line having two conductors connected respectively to different ones of said pair of windings at ends thereof near the apex of said surface, and resistive means connected between the ends of said winding near the base of said surface.
Claim 16
Dependent Claim
96 words
The invention as set forth in claim 12 wherein said resistive means includes a circular conductor disposed near the base of said surface, a first plurality of resistive elements each connected between the last turn of one of said pair of windings and said circular conductor at positions spaced from each other around the periphery of said circular conductor, and a second plurality of resistive elements each connected between the last turn of the other of said of windings and said circular conductor at positions spaced from each other around the periphery of said circular conductor.
Claim 17
Dependent Claim
19 words
The invention as set forth in claim 13 wherein the spacing of said pluralities of resistive element is logarithmic.
Claim 18
Dependent Claim
65 words
The invention as set forth in claim 11 including a second pair of windings spirally wound identically with said first pair of windings except in the opposite sense so as to define a second conical surface having a second axis, said second axis intersecting the axis of said first conical surface and so disposed that the same plane extends diametrically through both of said surfaces.
Claim 19
Dependent Claim
47 words
The invention as set forth in claim 15 including a reflector dish having a focal point along the axis of said dish and said surface being disposed on opposite sides of said focal point with said dish axis bisecting the angle between the axes of said surfaces.
Claim 20
Dependent Claim
22 words
The invention as set forth in claim 16 including means for supporting said surfaces for rotation about the axis of said dish.
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) | 1974-06-21 | 1974-12-21 | 1975-06-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-06-21 | 1978-12-21 | 1979-06-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-06-21 | 1982-12-21 | 1983-06-22 | $7700.00 | Window Closed / Lapsed |