Patent US4298960A successfully refreshed from Google Patents.
Patent US3569870A successfully refreshed from Google Patents.
US3569870A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Feed system
Assignee: RCA Corp
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Filing: 1969-06-11
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Granted: 1971-03-09
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Expires: 1989-06-11
Abstract
Abstract A feed system suitable for satellite communication earth station antennas and which includes a three-port polarizer assembly, multimode horn assembly and tracking difference mode circuitry is described. The three-port polarizer assembly is coupled to the horn assembly for providing full polarization mode flexibility for the sum modes. The multimode horn assembly provides excitation and control of both the sum and difference modes and inhibits the undesirable modes. The tracking difference mode circuitry is coupled to the multimode horn to process the difference modes and provide the azimuth and elevation information for monopulse tracking.
Inventors
- 👤 Peter Foldes
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 20:18
CPC Classifications
H; H01; H01P; H01P1/00; H01P1/16; G; G01; G01S; G01S13/00; G01S13/02; G01S13/06; G01S13/42; G01S13/44; G01S13/4409; G01S3/00; G01S3/02; G01S3/14; G01S3/146; H01Q; H01Q25/00; H01Q25/04
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
271 words
A polarization rotation system for propagation of orthogonal linear polarized electromagnetic signal waves within a given frequency band supplied thereto comprising: a first square waveguide section capable of propagation in both the TE10 and orthogonal TE10 modes, said first square waveguide section having a first series of irises spaced from each other along a first longitudinally extending corner of said first waveguide section and a second series of irises spaced from each other along a second longitudinally extending corner of said first waveguide section opposite said first corner, said first square waveguide section being responsive to said orthogonal linearly polarized waves for converting the orthogonal linearly polarized waves into opposite sense circular polarized waves; a second square waveguide section capable of propagation in both the TE10 and orthogonal TE01 modes, said second waveguide section having a first series of irises spaced from each other along a first longitudinally extending corner of said second waveguide section and a second series of irises spaced from each other along a second longitudinally extending corner of said second waveguide section opposite said first corner, said second square waveguide section being responsive to said circularly polarized waves of opposite sense for converting the circular polarized waves of opposite sense at its input to orthogonal linear polarized waves at its output; means for coupling said first square waveguide section in aligned relationship with said second square waveguide section; and means for rotating one of said square waveguide sections relative to the other where the attitude of the orthogonal linear polarization is a function of the angle between the two positions of said first and second waveguide sections.
Claim 2
Dependent Claim
271 words
A polarization rotation system for propagation of orthogonal linear polarized electromagnetic signal waves within a given frequency band supplied thereto comprising: a first square waveguide section capable of propagation in both the TE10 and orthogonal TE10 modes, said first square waveguide section having a first series of irises spaced from each other along a first longitudinally extending corner of said first waveguide section and a second series of irises spaced from each other along a second longitudinally extending corner of said first waveguide section opposite said first corner, said first square waveguide section being responsive to said orthogonal linearly polarized waves for converting the orthogonal linearly polarized waves into opposite sense circular polarized waves; a second square waveguide section capable of propagation in both the TE10 and orthogonal TE01 modes, said second waveguide section having a first series of irises spaced from each other along a first longitudinally extending corner of said second waveguide section and a second series of irises spaced from each other along a second longitudinally extending corner of said second waveguide section opposite said first corner, said second square waveguide section being responsive to said circularly polarized waves of opposite sense for converting the circular polarized waves of opposite sense at its input to orthogonal linear polarized waves at its output; means for coupling said first square waveguide section in aligned relationship with said second square waveguide section; and means for rotating one of said square waveguide sections relative to the other where the attitude of the orthogonal linear polarization is a function of the angle between the two positions of said first and second waveguide sections.
Claim 3
Dependent Claim
46 words
The combination as claimed in claim 1 including posts in them the middle of said irises whereby the post resonate at the upper part of the frequency band of said waves and said irises resonate at the lower part of the frequency band of said waves.
Claim 4
Dependent Claim
25 words
The combination as claimed in claim 1 wherein said means for rotating includes a rotary joint on each side of said second squarE waveguide section.
Claim 5
Dependent Claim
107 words
A phase shifter for providing differential phase shift of orthogonally polarized electromagnetic waves within a given frequency band comprising a square waveguide section capable of propagation in both the TE10 and orthogonal TE01 modes, said square waveguide section having a first series of irises spaced from each other along a first longitudinally extending corner of said waveguide section and a second series of irises spaced from each other along a second longitudinally extending corner of said waveguide section opposite said first corner for splitting of said waves in both modes into two equal power orthogonal components and for providing 90* differential phase shift between these two components.
Claim 6
Dependent Claim
107 words
A phase shifter for providing differential phase shift of orthogonally polarized electromagnetic waves within a given frequency band comprising a square waveguide section capable of propagation in both the TE10 and orthogonal TE01 modes, said square waveguide section having a first series of irises spaced from each other along a first longitudinally extending corner of said waveguide section and a second series of irises spaced from each other along a second longitudinally extending corner of said waveguide section opposite said first corner for splitting of said waves in both modes into two equal power orthogonal components and for providing 90* differential phase shift between these two components.
Claim 7
Dependent Claim
45 words
The combination as claimed in claim 4 including posts at the middle of the irises whereby the posts resonate at the upper part of the frequency band of said waves and said irises resonate at the lower part of the frequency band of said waves.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-03-08 | 1974-09-07 | 1975-03-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-03-08 | 1978-09-07 | 1979-03-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-03-08 | 1982-09-07 | 1983-03-09 | $7700.00 | Window Closed / Lapsed |