Vehicle mounted antenna and methods for transmitting and/or receiving signals
원문보기
IPC분류정보
국가/구분
United States(US) Patent
등록
국제특허분류(IPC7판)
H01Q-003/20
출원번호
US-0041463
(2011-03-07)
등록번호
US-8228253
(2012-07-24)
발명자
/ 주소
Berejik, Zacharia
출원인 / 주소
Mobile Sat Ltd.
인용정보
피인용 횟수 :
4인용 특허 :
13
초록▼
An antenna for communicating with a satellite from a moving vehicle. The antenna comprises a transmitter for generating a transmission signal, main and sub reflectors, and a waveguide associated with the transmitter for conducting the transmission signal toward the sub reflector. The sub reflector i
An antenna for communicating with a satellite from a moving vehicle. The antenna comprises a transmitter for generating a transmission signal, main and sub reflectors, and a waveguide associated with the transmitter for conducting the transmission signal toward the sub reflector. The sub reflector is configured for redirecting the transmission signal toward the main reflector; the main reflector is configured for projecting the redirected transmission signal as an antenna beam toward the satellite.
대표청구항▼
1. A method for communicating through a satellite, comprising: generating a transmission signal;polarizing said transmission signal using an ortho-mode transducer (OMT);radiating said polarized transmission signal via a feed horn so as to generate an ellipsoidal beam so as to create a first elliptic
1. A method for communicating through a satellite, comprising: generating a transmission signal;polarizing said transmission signal using an ortho-mode transducer (OMT);radiating said polarized transmission signal via a feed horn so as to generate an ellipsoidal beam so as to create a first elliptical spot with a width-height ratio of at least 1.6:1 on a sub reflector; andredirecting said ellipsoidal beam toward a main reflector so as to create a second elliptical spot having a width-height ratio of at least 3.5:1 on said main reflector;directing said ellipsoidal beam as an antenna beam toward the satellite; androtating said OMT to adjust a polarization of said antenna beam. 2. The method of claim 1, wherein said rotating is performed while maintaining said width-height ratio. 3. The method of claim 1, wherein said polarization is selected from a plurality of polarizations between L band and Ku band and between C band and Ka band. 4. The method of claim 1, wherein said antenna beam having a third elliptical spot of at least at least 4:1. 5. The method of claim 1, wherein said antenna beam having a main lobe, said directing comprises tilting of the center of said main lobe in a range of at least 50 degrees in relation to a rotation plane of said main and sub reflector without a gain degradation of more than 2 decibels. 6. The method of claim 5, wherein said range is between tilting angles of more than 15 degrees in relation to said rotation plane. 7. The method of claim 5, wherein said tilting allows the tilting of the center of said main lobe in a range of at least 60 degrees. 8. The method of claim 5, wherein said antenna lobe has a gain selected from a group consisting of at least 30 decibel isotropic (dBi) at 14 Ghz and at least 25 decibel isotropic (dBi) at 11 Ghz. 9. The method of claim 1, wherein said directing is performed by at least one supporting element, said main reflector and said at least one supporting element being detachably coupled. 10. The method of claim 1, wherein said radiating is performed from a moving vehicle. 11. An antenna for communicating with a satellite from a moving vehicle, comprising: main and sub reflectors;a transmitter for generating a transmission signal;an ortho-mode transducer (OMT) for polarizing said transmission signal;a feed for radiating said polarized transmission signal so as to generate an ellipsoidal beam creating a first elliptical spot with a width-height ratio of at least 1.6:1 on said sub reflector; andwherein said sub reflector is set to redirect said ellipsoidal beam toward said main reflector so as to create a second elliptical spot having a width-height ratio of at least 3.5:1 thereon;wherein said main reflector is set to direct said ellipsoidal beam as an antenna beam toward the satellite. 12. The antenna of claim 11, wherein at least one of said sub and main reflectors having a substantially ellipsoidal inner reflective surface profile. 13. The antenna of claim 11, wherein said feed is configured for radiating said sub reflector with a substantially ellipsoidal conical beam to create said first elliptical spot. 14. The antenna of claim 11, wherein said feed comprises a waveguide for conducting said polarized transmission signal from said OMT toward said sub reflector. 15. The antenna of claim 14, further comprising first and second rotary joints, said first rotary joint being disposed between said OMT and said waveguide and said second rotary joint being disposed between said OMT and at least one of a down converter, said transmitter, and a low noise block (LNB) downconverter. 16. The antenna of claim 15, wherein said first and second rotary joints allow adjusting the polarization of said transmission signal by facilitating the rolling of said polarizing element around the central axis of said waveguide while maintaining said waveguide firmly fixed in relation to said main and sub reflectors. 17. The antenna of claim 15, wherein at least one of said first and second rotary joints is less than 1 centimeter length. 18. The antenna of claim 14, further comprising a calibration track configured for allowing the adjustment of the position of said waveguide in relation to said sub reflector to calibrate said antenna beam. 19. The antenna of claim 14, wherein said waveguide having a feed horn connected to its end, said waveguide being configured for conducting said transmission signal toward said sub reflector via said feed horn. 20. The antenna of claim 14, wherein said waveguide having a bended passage. 21. The antenna of claim 20, wherein said bended passage having a bending angle of at least 5 degrees. 22. A method for receiving a communication signal from a satellite, comprising: receiving, during a motion of a vehicle, a downlink signal from a satellite beam having a first elliptical spot with a width-height ratio of at least 3.5:1 formed on a main reflector of an antenna mounted on said vehicle;redirecting said downlink signal so as to create a second elliptical spot with a width-height ratio of at least 1.6:1 on a sub reflector, said sub reflector being positioned in front of a waveguide;using said waveguide for directing a reflection of the redirected downlink signal from said sub reflector toward an ortho-mode transducer (OMT); andpolarizing the directed reflection to allow the reception of said communication signal from the satellite during said motion. 23. An antenna for receiving a downlink signal from a satellite from a moving vehicle, comprising: main and sub reflectors, said main reflector is shaped so as to receive a downlink signal forming a first elliptical spot with a width-height ratio of at least 3.5:1 thereon and to redirect said downlink signal as an ellipsoidal beam creating a second elliptical spot with a width-height ratio of at least 1.6:1 on said sub reflector;a feed for receiving a reflection of said downlink signal from said sub reflector;a rotating ortho-mode transducer (OMT) located behind said main reflector and configured for polarizing said reflection; anda receiver for receiving said polarized reflection.
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이 특허에 인용된 특허 (13)
Ogawa Masaru,JPX ; Nishikawa Kunitoshi,JPX ; Sato Kazuo,JPX, Antenna system.
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