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US3646589A Expired / Lapsed US ⏱️ 0.0 years remaining

Multimode tracking system utilizing a circular waveguide having slots angularly oriented with respect to the waveguide axis

Assignee: POITEVIN JEAN PIERRE R
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Filing: 1969-12-15
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Granted: 1972-02-29
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Expires: 1989-12-15
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Abstract

Abstract Improvement to systems for determining the position of a telecommunications satellite carrying a radiofrequency beacon transmitting signals of circular polarization of a given direction and in which, whenever the beacon is off the boresight axis of a circular horn antenna, the TM01 mode is excited together with the TE11 mode in the circular horn. The TM01 and TE11 modes are separated by a system including a circular feed waveguide for the horn, a pair of rectangular slots formed therein at two diametrically opposite points in a cross section of the waveguide, said slots having their longer sides respectively perpendicular to the direction of the magnetic field at those points of the TE11 mode having said given direction of polarization, two rectangular section guides connected perpendicularly to the circular waveguide and having their long sides respectively parallel to the long sides of the slots so that the slots excite TE10 mode waves in the rectangular waveguide, a magic T having two input waveguides respectively connected to the two rectangular waveguides, an output guide relating to the antisymmetrical waves in the input guides, at whose output the signal relating to the TM01 mode is collected, and an output guide relating to the symmetrical waves in the input guides and comprising an absorber which absorbs the symmetrical waves.

Inventors

  • 👤 Jean-Pierre R Poitevin

Bibliographic Details

Application Number —
Jurisdiction US
Data Source google_patents
Last Synchronized 2026-11-07 14:36
CPC Classifications
H; H01; H01P; H01P1/00; H01P1/16; G; G01; G01S; G01S3/00; G01S3/02; G01S3/14; G01S3/146; H01Q; H01Q25/00; H01Q25/04

Claims Analysis

Total Claims: 3
Claim 1
Independent Claim 246 words
In a system for determining the position of a mobile beacon transmitting signals of circular polarization with respect to a circular tracking horn and in which, whenever the beacon is off the horn boresight axis, the TM01 mode iS excited together with the TE11 mode in the circular horn, a device for separating the TM01 mode wave from the TE11 mode wave having a determined direction of circular polarization, said device including a circular feed waveguide for said horn, a pair of rectangular slots formed in said circular waveguide at two diametrically opposite points in a cross section of the waveguide symmetrically oriented with respect to said cross section and the longer sides of which are angularly shifted with respect to the axis of said circular feed waveguide by an angle Alpha given by the formula: where lambda is the used wavelength and R is the radius of said circular waveguide, two rectangular section guides connected perpendicularly to the circular waveguide and having their long sides respectively parallel to, the long sides of the slots so that the slots excite TE10 waves in the rectangular waveguide, a magic T having two input waveguides respectively connected to the two rectangular waveguides, an output guide, relating to the antisymmetrical waves in the input guides, at whose output the signal relating to the TM01 wave is collected, and an output guide, relating to the symmetrical waves in the input guides, and comprising an absorber which absorbs the symmetrical waves.
Claim 2
Dependent Claim 246 words
In a system for determining the position of a mobile beacon transmitting signals of circular polarization with respect to a circular tracking horn and in which, whenever the beacon is off the horn boresight axis, the TM01 mode iS excited together with the TE11 mode in the circular horn, a device for separating the TM01 mode wave from the TE11 mode wave having a determined direction of circular polarization, said device including a circular feed waveguide for said horn, a pair of rectangular slots formed in said circular waveguide at two diametrically opposite points in a cross section of the waveguide symmetrically oriented with respect to said cross section and the longer sides of which are angularly shifted with respect to the axis of said circular feed waveguide by an angle Alpha given by the formula: where lambda is the used wavelength and R is the radius of said circular waveguide, two rectangular section guides connected perpendicularly to the circular waveguide and having their long sides respectively parallel to, the long sides of the slots so that the slots excite TE10 waves in the rectangular waveguide, a magic T having two input waveguides respectively connected to the two rectangular waveguides, an output guide, relating to the antisymmetrical waves in the input guides, at whose output the signal relating to the TM01 wave is collected, and an output guide, relating to the symmetrical waves in the input guides, and comprising an absorber which absorbs the symmetrical waves.
Claim 3
Dependent Claim 64 words
A mode separating device as claimed in claim 1 in which said circular waveguide has two sets of said rectangular slots arranged in diametrically opposite pairs and coupled to two rectangular guides connected perpendicularly to said circular waveguide, the distance between consecutive slots of a set being equal to lambda g/4, where lambda g, is the common wavelength in the circular and rectangular waveguides.

References Cited (Backward Citations)

No citation records indexed.

USPTO Annuity & Maintenance Windows

Annuity Stage Window Opens Payment Deadline Surcharge Period Until Estimated Fee Status
3.5 Years (Year 4) 1975-02-28 1975-08-30 1976-02-29 $2000.00 Window Closed / Lapsed
7.5 Years (Year 8) 1979-02-28 1979-08-30 1980-02-29 $3760.00 Window Closed / Lapsed
11.5 Years (Year 12) 1983-02-28 1983-08-30 1984-02-29 $7700.00 Window Closed / Lapsed

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