Patent US3896449A successfully refreshed from Google Patents.
US3896449A
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: 1975-07-22
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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
2026-10-29 12:53
CPC Classifications
H; H01; H01Q; H01Q13/00; H01Q13/02; H01Q13/025
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
100 words
An LSE12 mode compensated antenna comprising a first rectangular waveguide segment having an inward E-plane flare, the input end thereof being adapted for connection to a rectangular waveguide transmission line, a second rectangular waveguide segment having an outward E-plane flare having its nonflared end connected to the output end of a said first waveguide segment, and a rectangular antenna horn having an outward E-plane flare connected at its input end to the flared end of said second waveguide segment, said second waveguide segment having length and flare angle values that effect the generation and phase reversal of LSE12 mode power.
Claim 2
Dependent Claim
100 words
An LSE12 mode compensated antenna comprising a first rectangular waveguide segment having an inward E-plane flare, the input end thereof being adapted for connection to a rectangular waveguide transmission line, a second rectangular waveguide segment having an outward E-plane flare having its nonflared end connected to the output end of a said first waveguide segment, and a rectangular antenna horn having an outward E-plane flare connected at its input end to the flared end of said second waveguide segment, said second waveguide segment having length and flare angle values that effect the generation and phase reversal of LSE12 mode power.
Claim 3
Dependent Claim
22 words
An LSE12 mode compensated antenna as defined in claim 1 wherein said second waveguide segment has 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) | 1978-07-21 | 1979-01-20 | 1979-07-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-07-21 | 1983-01-20 | 1983-07-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-07-21 | 1987-01-20 | 1987-07-22 | $7700.00 | Window Closed / Lapsed |