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US3864688A
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US
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Cross-polarized parabolic antenna
Assignee: Commscope Technologies LLC
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Filing: 1974-03-26
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Granted: 1975-02-04
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Expires: 1994-03-26
Abstract
Abstract A cross-polarized parabolic antenna employs a horn fed by two rectangular waveguides having their longer transverse dimension in a common plane, with a 90* polarization rotator in the feed between the connection points of the waveguide.
Inventors
- 👤 Laurence H Hansen
- 👤 Robert E Massey
- 👤 Aloysius Wojnowski
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 19:40
CPC Classifications
H; H01; H01Q; H01Q13/00; H01Q13/02; H01Q13/025; H01Q13/0258; H01P; H01P1/00; H01P1/16; H01P1/161; H01Q19/00; H01Q19/10; H01Q19/12; H01Q19/13
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
69 words
In a cross-polarized antenna comprising a parabolic reflector, a horn feed at the focus of the reflector, a pair of rectangular waveguides connected to the feed, the improvement characterized by the longer transverse H-plane dimension of both waveguides being aligned in a common radial plane, and the feed including a 90* polarization rotator between the point of connection of one waveguide and the point of connection of the other.
Claim 2
Dependent Claim
69 words
In a cross-polarized antenna comprising a parabolic reflector, a horn feed at the focus of the reflector, a pair of rectangular waveguides connected to the feed, the improvement characterized by the longer transverse H-plane dimension of both waveguides being aligned in a common radial plane, and the feed including a 90* polarization rotator between the point of connection of one waveguide and the point of connection of the other.
Claim 3
Dependent Claim
31 words
The cross-polarized antenna of claim 1 further characterized by the feed comprising a circular tube extending along the parabolic axis and having the respective waveguides connected adjacent to opposite ends thereof.
Claim 4
Dependent Claim
43 words
The cross-polarized antenna of claim 2 characterized by the polarization rotator comprising conductor means between the waveguide connections extending diametrically across the tube and forming a 90* twisted baffle with the outer end in said common plane and the inner end perpendicular thereto.
Claim 5
Dependent Claim
22 words
The antenna of claim 3 wherein the conductor means comprises a series of closely spaced pins extending across successively slightly rotated diameters.
Claim 6
Dependent Claim
31 words
The antenna of claim 3 having added conductor means forming a planar extension of said inner end to form an isolation section blocking undesired outward propagation from the other wave-guide connection.
Claim 7
Dependent Claim
17 words
The antenna of claim 1 having the outer ends of both waveguides extending radially from the feed.
Claim 8
Dependent Claim
26 words
The antenna of claim 6 having thE inner ends of both waveguides extending axially through the reflector, both waveguides being bent solely in their common H-plane.
References Cited (Backward Citations)
US2526383A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-02-03 | 1978-08-05 | 1979-02-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-02-03 | 1982-08-05 | 1983-02-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-02-03 | 1986-08-05 | 1987-02-04 | $7700.00 | Window Closed / Lapsed |