US4232322A
Expired / Lapsed
US
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Antenna having radiation pattern with main lobe of generally elliptical cross-section
Assignee: Telecom Italia SpA
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Filing: 1978-11-20
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Granted: 1980-11-04
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Expires: 1998-11-20
Abstract
Abstract An antenna designed to emit a beam of generally elliptical cross-section has a reflector with a parabolic-elliptical concave surface conforming to the formula (x/p)+(y/q)=2z where p and q are the parameters of its parabolic cross-section in the xz and yz planes, respectively. A microwave feed located on a line interconnecting the foci of these two parabolas, preferably at the outer focus separated from the surface vertex by a distance q/2, generates a beam parallel to the axis whose ellipticity depends on the ratio q/p.
Inventors
- 👤 Salvatore De Padova
- 👤 Enrico Pagana
- 👤 Giorgio Rosenga
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 12:14
CPC Classifications
H; H01; H01Q; H01Q15/00; H01Q15/14; H01Q15/16; H01Q19/00; H01Q19/10; H01Q19/12
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
131 words
An antenna having a radiation pattern with a main lobe of generally elliptical cross-section, comprising: a reflector with a concave surface whose cross-sections in two mutually orthogonal planes substantially define segments of respective parabolas of different parameters p and q with p≠q, said parabolas having a common vertex and different foci on a common axis passing through said vertex, said surface intersecting a plane transverse to said common axis in a generally elliptical curve; and a source of microwaves trained upon said concave surface, said source being located with its phase center of radiation in a zone bounded by two imaginary spherical surfaces of respective radii p/2 and q/2 centered on said vertex and passing through said foci, thereby establishing a radiation pattern with a main lobe of generally elliptical cross-section.
Claim 2
Dependent Claim
131 words
An antenna having a radiation pattern with a main lobe of generally elliptical cross-section, comprising: a reflector with a concave surface whose cross-sections in two mutually orthogonal planes substantially define segments of respective parabolas of different parameters p and q with p≠q, said parabolas having a common vertex and different foci on a common axis passing through said vertex, said surface intersecting a plane transverse to said common axis in a generally elliptical curve; and a source of microwaves trained upon said concave surface, said source being located with its phase center of radiation in a zone bounded by two imaginary spherical surfaces of respective radii p/2 and q/2 centered on said vertex and passing through said foci, thereby establishing a radiation pattern with a main lobe of generally elliptical cross-section.
Claim 3
Dependent Claim
18 words
An antenna as defined in claim 1 wherein said phase center lies on a line interconnecting said foci.
Claim 4
Dependent Claim
20 words
An antenna as defined in claim 2 wherein said phase center coincides with the focus more remote from said vertex.
Claim 5
Dependent Claim
20 words
An antenna as defined in claim 1, 2, or 3 wherein said concave surface is defined by a continuous function.
Claim 6
Dependent Claim
47 words
An antenna as defined in claim 4 wherein said function substantially conforms to the equation (x.sup.2 /p)+(y.sup.2 /q)=2z where x, y and z are the axes of a co-ordinate system having its origin at said vertex, said common axis being the z axis of said co-ordinate system.
Claim 7
Dependent Claim
26 words
An antenna as defined in claim 5 wherein said source has a radiation cone illuminating an area of said concave surface offset from said z axis.
References Cited (Backward Citations)
DE1293255B
Cited
DE2263248A1
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1983-11-04 | 1984-05-05 | 1984-11-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-11-04 | 1988-05-05 | 1988-11-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-11-04 | 1992-05-05 | 1992-11-04 | $7700.00 | Window Closed / Lapsed |