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Patent US3898669A successfully refreshed from Google Patents.
US3898669A
Expired / Lapsed
US
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Apparatus for providing higher order mode compensation in horn antennas
Assignee: United States Department of the Air Force
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Filing: 1974-02-22
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Granted: 1975-08-05
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Expires: 1994-02-22
Abstract
Abstract The unwanted higher order mode power that occurs in flared antenna horns is compensated for by inserting flare sections into the antenna horn feed structure. The feed structure flares also generate higher order mode power and are positioned and constructed in such a manner that the higher order mode power so generated is substantially equal to and in phase opposition with the higher order mode power occurring in the antenna horn. Various embodiments utilize single outward, double outward and double inward flares.
Inventors
- 👤 Alan E Blume
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 07:54
CPC Classifications
H; H01; H01Q; H01Q13/00; H01Q13/02; H01Q13/025; H01P; H01P1/00; H01P1/16
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
140 words
An LSE12 mode compensated antenna comprising two rectangular waveguide segments, (6),(7), each segment having an outward E-plane flare and having its nonflared end adapted for connection to a rectangular waveguide transmission line, said waveguide segments being jointed at their flared ends, said outward E-plane flares being at an angle that effects the generation of substantial amounts of LSE12 mode power, a rectangular waveguide transmission line segment (5) connected to the nonflared end of one of said waveguide segments, and a rectangular antenna horn (4) having an outward E-plane flare connected at its input end to said transmission line segment (5), said waveguide segments (6),(7) and said transmission segment (5) having length dimensions that bring all LSE12 mode power generated in said waveguide segment into phase opposition with LSE12 mode power generated by the E-plane flare angle of said antenna horn.
Claim 2
Dependent Claim
140 words
An LSE12 mode compensated antenna comprising two rectangular waveguide segments, (6),(7), each segment having an outward E-plane flare and having its nonflared end adapted for connection to a rectangular waveguide transmission line, said waveguide segments being jointed at their flared ends, said outward E-plane flares being at an angle that effects the generation of substantial amounts of LSE12 mode power, a rectangular waveguide transmission line segment (5) connected to the nonflared end of one of said waveguide segments, and a rectangular antenna horn (4) having an outward E-plane flare connected at its input end to said transmission line segment (5), said waveguide segments (6),(7) and said transmission segment (5) having length dimensions that bring all LSE12 mode power generated in said waveguide segment into phase opposition with LSE12 mode power generated by the E-plane flare angle of said antenna horn.
Claim 3
Dependent Claim
27 words
An LSE12 mode compensated antenna as defined in claim 1 wherein said waveguide segment and said transmission line segment each have a length of substantially one-half wavelength.
References Cited (Backward Citations)
US3662393A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-08-04 | 1979-02-03 | 1979-08-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-08-04 | 1983-02-03 | 1983-08-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-08-04 | 1987-02-03 | 1987-08-05 | $7700.00 | Window Closed / Lapsed |