US3758880A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Waveguide mode coupler for separating waves of useful mode from waves of higher mode
Assignee: Licentia Patent Verwaltungs GmbH
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Filing: 1972-07-17
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Granted: 1973-09-11
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Expires: 1992-07-17
Abstract
Abstract A mode coupler useful in ranging systems for evaluating higher waveguide wave modes resulting from aperture deviations of an antenna exciter for determining angular deviation in the azimuth plane as well as in the elevation plane. Waves of the useful mode are separated from waves of a higher mode. A first waveguide section for propagating all evaluatable wave modes is adapted to be coupled to an antenna. A second waveguide section for propagating exclusively the useful wave mode is connected in series with the first waveguide section. A gap is provided between the first waveguide section and the second waveguide section and is provided with a plurality of apertures for the higher wave modes in the direction of propagation of the waves. New modes corresponding to the higher wave modes are substantially excited by the useful mode containing the ranging signal.
Inventors
- 👤 G Morz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 10:52
CPC Classifications
G; G01; G01S; G01S3/00; G01S3/02; G01S3/14; G01S3/146; H; H01; H01P; H01P1/00; H01P1/16; H01Q; H01Q13/00; H01Q13/02; H01Q13/025
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
147 words
A mode coupler for use in ranging systems for evaluating waveguide wave modes resulting from aperture deviations of an antenna exciter for determining angular deviation in the azimuth plane as well as in the elevation plane wherein waves of a useful mode are separated from waves of a higher mode, comprising a first waveguide section for propagating all evaluatable wave modes and adapted to be coupled to an antenna; a second waveguide section dimensioned for propagating exclusively the useful wave mode and connected in series with said first waveguide section so as to create a gap between said first waveguide section and said second waveguide section, said gap being provided with means to define a plurality of apertures for the higher wave modes in the direction of propagation of the waves whereby new modes corresponding to the higher wave modes are substantially excited by tHe useful mode.
Claim 2
Dependent Claim
147 words
A mode coupler for use in ranging systems for evaluating waveguide wave modes resulting from aperture deviations of an antenna exciter for determining angular deviation in the azimuth plane as well as in the elevation plane wherein waves of a useful mode are separated from waves of a higher mode, comprising a first waveguide section for propagating all evaluatable wave modes and adapted to be coupled to an antenna; a second waveguide section dimensioned for propagating exclusively the useful wave mode and connected in series with said first waveguide section so as to create a gap between said first waveguide section and said second waveguide section, said gap being provided with means to define a plurality of apertures for the higher wave modes in the direction of propagation of the waves whereby new modes corresponding to the higher wave modes are substantially excited by tHe useful mode.
Claim 3
Dependent Claim
48 words
An arrangement as defined in claim 1 wherein said first waveguide section and said second waveguide section are each of square cross section, said second waveguide section being smaller than, and positioned within at least a portion of, said first waveguide section so as to define said gap.
Claim 4
Dependent Claim
125 words
An arrangement as defined in claim 1 wherein said first waveguide section and said second waveguide section are of square cross section and form respective parts of a single waveguide having a region of progressively decreasing cross section between said first and second sections and in the direction of wave propagation, the tapering of said waveguide being so dimensioned that all evaluatable wave modes exist in said first waveguide section adapted to face the antenna and only the useful mode exists in said second waveguide section, and said means which defines said plurality of apertures includes a plurality of slits disposed between said first waveguide section and said second waveguide section, said slits being so dimensioned that only the higher mode waves are coupled out.
Claim 5
Dependent Claim
78 words
An arrangement as defined in claim 3 further comprising a three branch T circuit having two equal input branches and an output branch, and at least two oppositely disposed waveguide output means coupled respectively between said mode coupler and respective ones of said input branches of said T circuit for receiving signals from the mode coupler and supplying these signals to said T circuit, whereby a ranging signal is available at said output branch of said T circuit.
Claim 6
Dependent Claim
39 words
An arrangement as defined in claim 4 wherein each of said waveguide output means comprises a respective waveguide section each having its center axis perpendicular to the longitudinal axis of said first waveguide section and said second waveguide section.
Claim 7
Dependent Claim
41 words
An arrangement as defined in claim 5 wherein each of said waveguide output means are tunable resonant circuits whereby said waveguide output means are loosely coupled to said mode coupler and loosely decoupled to said input branches of said T circuit.
References Cited (Backward Citations)
US3155923A
Cited
US3634790A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-09-10 | 1977-03-12 | 1977-09-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-09-10 | 1981-03-12 | 1981-09-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-09-10 | 1985-03-12 | 1985-09-11 | $7700.00 | Window Closed / Lapsed |