Feed horn for a telecommunications antenna
First Claim
Patent Images
1. A feed horn for a telecommunications antenna, said feed horn being fabricated from a moldable material, said feed horn comprising:
- a radiating portion having a circular aperture, said radiating portion being formed by an annular flange provided with a least two concentric grooves forming two traps, said grooves having open ends which are substantially coplanar;
a transition having first and second ends and formed by waveguide sections of progressively varying cross-section, said transition being coupled at said first end to said radiating portion;
a flange surrounding said second end of said transition and which provides a coupling with a rectangular waveguide; and
fixing means for fixing said feed horn in a support, said fixing means comprising two concentric cylindrical flanges having different diameters and located in the external central portion of said horn.
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Abstract
A feed horn comprising a radiating portion having a circular aperture, a transition formed by progressively varying waveguide sections and a flange which provides a coupling with a rectangular waveguide is fabricated from moldable material and designed to be fixed in a support. The radiating portion of the horn is formed by a cylindrical flange having at least two concentric grooves which form two traps.
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Citations
13 Claims
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1. A feed horn for a telecommunications antenna, said feed horn being fabricated from a moldable material, said feed horn comprising:
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a radiating portion having a circular aperture, said radiating portion being formed by an annular flange provided with a least two concentric grooves forming two traps, said grooves having open ends which are substantially coplanar; a transition having first and second ends and formed by waveguide sections of progressively varying cross-section, said transition being coupled at said first end to said radiating portion; a flange surrounding said second end of said transition and which provides a coupling with a rectangular waveguide; and fixing means for fixing said feed horn in a support, said fixing means comprising two concentric cylindrical flanges having different diameters and located in the external central portion of said horn. - View Dependent Claims (5)
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2. A feed horn for a telecommunication antenna, said feed horn being fabricated from a moldable material, said feed horn comprising:
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a radiating portion having a circular aperture, said radiating portion being formed by an annular flange provided with a least two concentric grooves forming two traps, said grooves having open ends which are substantially coplanar; a transition having first and second ends and formed by waveguide sections of progressively varying cross-section, said transition being coupled at said first end to said radiating portion and including at least two circular transitions followed by at least two transitions of rectangular shape; a flange surrounding said second end of said transition and which provides a coupling with a rectangular waveguide; and fixing means for fixing said feed horn in a support.
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3. A feed horn for a telecommunications antenna, said feed horn being fabricated from a moldable material, said feed horn comprising:
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a radiating portion having a circular aperture, said radiating portion being formed by an annular flange provided with a least two concentric grooves forming two traps, said circular aperture having a diameter of 1.2λ
surrounded by two traps having a thickness of 0.085λ and
located behind the aperture, said traps themselves being relatively spaced at a distance of 0.085λ
, where λ
is the wavelength corresponding to a center frequency in the useful band, and wherein the transition comprises successively six steps of λ
g /4, where λ
g is the wavelength of guided waves;a transition having first and second ends and formed by waveguide sections of progressively varying cross-section, said transition being coupled at said first end to said radiating portion and including at least two circular transitions followed by at least two transitions of rectangular shape; a flange surrounding said second end of said transition and which provides a coupling with a rectangular waveguide; and fixing means for fixing said feed horn in a support. - View Dependent Claims (4, 6, 7, 8)
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9. A feed horn for a telecommunications antenna, said feed horn being fabricated from a moldable material, said feed horn comprising:
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a radiating portion having a circular aperture, said radiating portion being formed by an annular flange provided with a least two concentric grooves forming two traps, said grooves having open ends which are substantially coplanar; a transition having first and second ends and formed by waveguide sections of progressively varying cross-section, said transition being coupled at said first end to said radiating portion and including at least two circular transitions followed by at least two transitions of rectangular shape with rounded corners followed by at least one transition of rectangular shape with square corners; a flange surrounding said second end of said transition and which provides a coupling with a rectangular waveguide; and fixing means for fixing said feed horn in a support.
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10. A feed horn for a telecommunication antenna, said feed horn being fabricated from a moldable material, said feed horn comprising:
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a radiating portion having a circular aperture, said radiating portion being formed by an annular flange provided with a least two concentric grooves forming two traps, said grooves having open ends which are substantially coplanar; a transition having first and second ends and formed by waveguide sections of progressively varying cross-section, said transition being coupled at said first end to said radiating portion and including at least two circular transitions followed by at least two transitions of rectangular shape with rounded corners followed by at least one transition of rectangular shape with square corners; a flange surrounding said second end of said transition and which provides a coupling with a rectangular waveguide; and fixing means for fixing said feed horn in a support.
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11. A feed horn for a telecommunication antenna, said feed horn being fabricated from a moldable material, said feed horn comprising:
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a radiating portion having a circular aperture, said radiating portion being formed by an annular flange provided with a least two concentric grooves forming two traps, said grooves having open ends which are substantially coplanar; a transition having first and second ends and formed by waveguide sections of progressively varying cross-section, said transition being coupled at said first end to said radiating portion; a flange surroundings said second end of said transition and which provides a coupling with a rectangular waveguide; and fixing means for fixing said feed horn in a support.
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12. A feed horn for a telecommunication antenna, said feed horn being fabricated from a moldable material, said feed horn comprising:
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a radiating portion having a circular aperture, said radiating portion being formed by an annular flange provided with a least two concentric grooves forming two traps; a transition having first and second ends and formed by waveguide sections of progressively varying cross-section, said transition being coupled at said first end to said radiating portion; a flange surrounding said second end of said transition and which provides a coupling with a rectangular waveguide; fixing means for fixing said feed horn in a support; and an integrated pressurization nipple. - View Dependent Claims (13)
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Specification