Multiple flared antenna horn with enhanced aperture efficiency
First Claim
Patent Images
1. An antenna horn with enhanced aperture efficiency, the antenna horn comprising:
- a first outward flare section, a second cylindrical flare section, a third outward flare section, and a fourth outward flare section;
wherein the first outward flare section is adapted to be coupled to a waveguide and the fourth outward flare section has an aperture through which electromagnetic energy is coupled to or from space;
wherein the slopes and lengths of the first outward flare section, the second cylindrical flare section, the third outward flare section, and the fourth outward flare section are selected to enhance desirable electromagnetic modes at the aperture, thereby enhancing the aperture efficiency and antenna gain;
wherein the first outward flare section is coupled to the second cylindrical flare section without a step discontinuity;
wherein the second cylindrical flare section is coupled to the third outward flare section without a step discontinuity;
wherein the third outward flare section is coupled to the fourth outward flare section without a step discontinuity;
wherein the desirable electromagnetic modes are TE modes and the first outward flare section, the second cylindrical flare section, the third outward flare section, and the fourth outward flare section are selected to enhance the TE modes and suppress any TM modes at the aperture.
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Abstract
An antenna horn having multiple flared sections with their slopes and lengths selected to enhance desirable electromagnetic modes and to suppress undesirable modes at the horn aperture, thereby increasing the aperture efficiency and antenna gain.
230 Citations
20 Claims
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1. An antenna horn with enhanced aperture efficiency, the antenna horn comprising:
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a first outward flare section, a second cylindrical flare section, a third outward flare section, and a fourth outward flare section; wherein the first outward flare section is adapted to be coupled to a waveguide and the fourth outward flare section has an aperture through which electromagnetic energy is coupled to or from space; wherein the slopes and lengths of the first outward flare section, the second cylindrical flare section, the third outward flare section, and the fourth outward flare section are selected to enhance desirable electromagnetic modes at the aperture, thereby enhancing the aperture efficiency and antenna gain; wherein the first outward flare section is coupled to the second cylindrical flare section without a step discontinuity; wherein the second cylindrical flare section is coupled to the third outward flare section without a step discontinuity; wherein the third outward flare section is coupled to the fourth outward flare section without a step discontinuity; wherein the desirable electromagnetic modes are TE modes and the first outward flare section, the second cylindrical flare section, the third outward flare section, and the fourth outward flare section are selected to enhance the TE modes and suppress any TM modes at the aperture. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. An apparatus, comprising:
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an antenna horn for sending and receiving electromagnetic energy; wherein the antenna horn comprises a first outward flare section, a second cylindrical flare section, a third outward flare section, and a fourth outward flare section; wherein the first outward flare section is adapted to be coupled to a waveguide and the fourth outward flare section has an aperture through which the electromagnetic energy is coupled to or from space; wherein the first outward flare section comprises a flare angle of approximately 23.0 degrees; wherein the second cylindrical flare section comprises a flare angle of approximately 0.0 degrees; wherein the third outward flare section comprises a flare angle of approximately 18.94 degrees; wherein the fourth outward flare section comprises a flare angle of approximately 5.09 degrees. - View Dependent Claims (14, 15, 16, 17, 18)
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19. An apparatus, comprising:
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an antenna horn for sending and receiving electromagnetic energy; wherein the antenna horn comprises a first flare section, a second flare section, a third flare section, and a fourth flare section that are coupled in succession without any step discontinuities; wherein the first flare section is adapted to be coupled to a waveguide and the fourth flare section has an aperture through which the electromagnetic energy is coupled to or from space; wherein the first flare section comprises a first flare angle that is positive; wherein the second flare section comprises a second flare angle that is less than the first flare angle; wherein the third flare section comprises a third flare angle that is greater than the second flare angle; wherein the fourth flare section comprises a fourth flare angle that is less than the third flare angle. - View Dependent Claims (20)
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Specification