Claims
- 1. A multimode horn for feeding an antenna, comprising a generally hollowed conical structure for either transmitting or receiving an electromagnetic signal therethrough and flaring radially outwardly from a throat section to an aperture having a pre-determined size, said structure having an internal wall with a plurality of discontinuities for altering the mode content of said signal to achieve a balance between a plurality of performance parameters of said antenna over a pre-determined frequency range of said signal, at least one of said plurality of performance parameters being from the group of horn on-axis directivity, horn pattern beamwidth, antenna illumination edge-taper, antenna illumination profile and antenna spill-over losses.
- 2. A horn as defined in claim 1, wherein said plurality of discontinuities of said internal wall being generally axially symmetrical around an axis of said structure.
- 3. A horn as defined in claim 2, wherein said plurality of discontinuities including at least one corrugation, said plurality of discontinuities further including between said aperture and the closest one of said at least one corrugation to said aperture a combination of different local smooth profiles, steps, and chokes.
- 4. A horn as defined in claim 1, wherein said plurality of discontinuities having an irregular profile.
- 5. A horn as defined in claim 4, wherein said plurality of discontinuities being a combination of different local smooth profiles.
- 6. A horn as defined in claim 4, wherein said plurality of discontinuities being a combination of different local smooth profiles and steps.
- 7. A horn as defined in claim 4, wherein said plurality of discontinuities being a combination of different local smooth profiles and corrugations.
- 8. A horn as defined in claim 4, wherein said plurality of discontinuities being a combination of steps and corrugations.
- 9. A horn as defined in claim 4, wherein said plurality of discontinuities being a combination of different local smooth profiles, steps and corrugations.
- 10. A horn as defined in claim 4, wherein said plurality of discontinuities being a combination of different local smooth profiles, steps, corrugations and chokes.
- 11. A horn as defined in claim 4, wherein said plurality of discontinuities being a combination of different local smooth profiles and chokes.
- 12. A horn as defined in claim 4, wherein said plurality of discontinuities being a combination of different local smooth profiles, steps and chokes.
- 13. A horn as defined in claim 1, wherein said mode content including a combination of dominant and higher order modes.
- 14. A multiple beam antenna including either reflectors or lens and a plurality of multimode horns to feed the same, each of said plurality of horns generating a respective beam of said antenna and comprising a generally hollowed conical structure for either transmitting or receiving an electromagnetic signal therethrough and flaring radially outwardly from a throat section to an aperture having a pre-determined size, said structure having an internal wall with a plurality of discontinuities for altering the mode content of said signal to achieve a balance between a plurality of performance parameters of said antenna over a pre-determined frequency range of said signal, at least one of said plurality of performance parameters being from the group of horn on-axis directivity, horn pattern beamwidth, antenna illumination edge-taper, antenna illumination profile and antenna spill-over losses.
- 15. An antenna as defined in claim 14, wherein said plurality of discontinuities of said internal wall being generally axially symmetrical around an axis of said structure.
- 16. An antenna as defined in claim 15, wherein said discontinuities including at least one corrugation, said plurality of discontinuities further including between said aperture and the closest one of said at least one corrugation to said aperture a combination of different local smooth profiles, steps, and chokes.
- 17. An antenna as defined in claim 14, wherein said plurality of discontinuities having an irregular profile.
- 18. An antenna as defined in claim 17, wherein said plurality of discontinuities being a combination of different local smooth profiles and steps.
- 19. An antenna as defined in claim 17, wherein said plurality of discontinuities being a combination of different local smooth profiles and corrugations.
- 20. An antenna as defined in claim 17, wherein said plurality of discontinuities being a combination of different local smooth profiles, steps and corrugations.
- 21. An antenna as defined in claim 17, wherein said plurality of discontinuities being a combination of different local smooth profiles, steps, corrugations and chokes.
- 22. An antenna as defined in claim 17, wherein said plurality of discontinuities being a combination of different local smooth profiles and chokes.
- 23. An antenna as defined in claim 17, wherein said plurality of discontinuities being a combination of different local smooth profiles, steps and chokes.
- 24. An antenna as defined in claim 14, wherein said plurality of horns being divided into a plurality of subgroups, all of said horns of a same one of said subgroups having a common of said plurality of discontinuities.
CROSS REFERENCE TO RELATED APPLICATION
[0001] This application is related to U.S. provisional application for patent Ser. No. 60/198,618 filed on Apr. 20, 2000.
Provisional Applications (1)
|
Number |
Date |
Country |
|
60198618 |
Apr 2000 |
US |