US3573835A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Impedance matched open-ended waveguide array
Assignee: Raytheon Co
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Filing: 1969-01-14
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Granted: 1971-04-06
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Expires: 1989-01-14
Abstract
Abstract The apparatus of the present invention provides an open-ended waveguide array wherein the impedance of the array elements are efficiently matched over a wide beam scan angle at reasonable cost. This impedance matching is achieved by employing open-ended waveguide radiators which are capable of supporting multiple waveguide modes for the respective radiating elements. In the operation of an illustrative embodiment of the array, the excitation of the two lowest order modes of appropriate phase in each of the open-ended waveguide radiating elements produces well-matched elements over a wide beam scan angle.
Inventors
- 👤 Louis Stark
- 👤 Raymond Tang
- 👤 Nam San Wong
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 20:05
CPC Classifications
H; H01; H01Q; H01Q21/00; H01Q21/06; H01Q21/08; H01Q13/00; H01Q13/06; H01Q25/00; H01Q25/04
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
141 words
An antenna array comprising a plurality of open-ended rectangular waveguide elements of uniform length having narrow walls and broad walls, said waveguide elements being disposed at uniform intervals in a lineAr array with said broad walls thereof normal to the direction thereof and with one corresponding extremity of each of said open-ended rectangular waveguide elements disposed in a common plane; a shorting plane disposed transversely across each of said plurality of waveguide elements at the respective extremities thereof opposite from said one extremity; a coaxial line input to each of said rectangular waveguide elements; and an offset-loop transition between each respective waveguide element and the coaxial line corresponding thereto, the offset from center along said broad walls of said loop transition between respective waveguide elements and corresponding coaxial lines being greater than 5 percent of the width of said broad walls.
Claim 2
Dependent Claim
141 words
An antenna array comprising a plurality of open-ended rectangular waveguide elements of uniform length having narrow walls and broad walls, said waveguide elements being disposed at uniform intervals in a lineAr array with said broad walls thereof normal to the direction thereof and with one corresponding extremity of each of said open-ended rectangular waveguide elements disposed in a common plane; a shorting plane disposed transversely across each of said plurality of waveguide elements at the respective extremities thereof opposite from said one extremity; a coaxial line input to each of said rectangular waveguide elements; and an offset-loop transition between each respective waveguide element and the coaxial line corresponding thereto, the offset from center along said broad walls of said loop transition between respective waveguide elements and corresponding coaxial lines being greater than 5 percent of the width of said broad walls.
Claim 3
Dependent Claim
143 words
An antenna array comprising a plurality of open-ended rectangular waveguide elements of uniform length having narrow walls and broad walls, said waveguide elements being disposed at uniform intervals in a linear array with said broad walls thereof normal to the direction thereof and with one corresponding extremity of each of said open-ended rectangular waveguide elements being disposed in a common plane; a shorting plane disposed transversely across each of said plurality of waveguide elements at the respective extremities thereof opposite from said one extremity; a coaxial line input to each of said rectangular waveguide elements; and an offset probe transition between each respective waveguide element and the coaxial line corresponding thereto, the offset from center along said broad walls of said probe transition between respective waveguide elements and corresponding coaxial lines being greater than 5 percent of the width of said broad walls.
Claim 4
Dependent Claim
143 words
An antenna array comprising a plurality of open-ended rectangular waveguide elements of uniform length having narrow walls and broad walls, said waveguide elements being disposed at uniform intervals in a linear array with said broad walls thereof normal to the direction thereof and with one corresponding extremity of each of said open-ended rectangular waveguide elements being disposed in a common plane; a shorting plane disposed transversely across each of said plurality of waveguide elements at the respective extremities thereof opposite from said one extremity; a coaxial line input to each of said rectangular waveguide elements; and an offset probe transition between each respective waveguide element and the coaxial line corresponding thereto, the offset from center along said broad walls of said probe transition between respective waveguide elements and corresponding coaxial lines being greater than 5 percent of the width of said broad walls.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-04-05 | 1974-10-05 | 1975-04-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-04-05 | 1978-10-05 | 1979-04-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-04-05 | 1982-10-05 | 1983-04-06 | $7700.00 | Window Closed / Lapsed |