An introduction of an auto-tracking antenna is given to replace the nutating conical-scankind.In tracking the signal target with linear polarization,the use of the nutating joint with complexstructure can be avoided.T...An introduction of an auto-tracking antenna is given to replace the nutating conical-scankind.In tracking the signal target with linear polarization,the use of the nutating joint with complexstructure can be avoided.The advantages are evident in economy and stability.The design principle ofthe antenna and feed is also introduced.According to this principle,the antenna has been made.Themeasured values of the feed and antenna show that the angles of the beam deviated from the antenna axisin any plane are almost the same and the polarization performances are excellent.In tracking the signal tar-get with linear polarization,the target is caught quickly and exactly,and the situation of the antenna is sta-ble.The tracking performences are satisfactory.展开更多
Using the moment method the mode ratio formulas are derived for coaxial multimode feeds. First, using the geometrical thoery of diffraction, the fields are found over an infinite plane which is one wavelength away fro...Using the moment method the mode ratio formulas are derived for coaxial multimode feeds. First, using the geometrical thoery of diffraction, the fields are found over an infinite plane which is one wavelength away from the feed aperture, and then, based on these fields, the radiation field of the feed is evaluated. The good agreement between the theoretical and the measured results shows the method presented is available.展开更多
文摘An introduction of an auto-tracking antenna is given to replace the nutating conical-scankind.In tracking the signal target with linear polarization,the use of the nutating joint with complexstructure can be avoided.The advantages are evident in economy and stability.The design principle ofthe antenna and feed is also introduced.According to this principle,the antenna has been made.Themeasured values of the feed and antenna show that the angles of the beam deviated from the antenna axisin any plane are almost the same and the polarization performances are excellent.In tracking the signal tar-get with linear polarization,the target is caught quickly and exactly,and the situation of the antenna is sta-ble.The tracking performences are satisfactory.
文摘Using the moment method the mode ratio formulas are derived for coaxial multimode feeds. First, using the geometrical thoery of diffraction, the fields are found over an infinite plane which is one wavelength away from the feed aperture, and then, based on these fields, the radiation field of the feed is evaluated. The good agreement between the theoretical and the measured results shows the method presented is available.
