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    • 8. 发明专利
    • DUAL-BAND ANTENNA SYSTEM OF A BEAM WAVEGUIDE TYPE
    • CA1205184A
    • 1986-05-27
    • CA432152
    • 1983-07-11
    • NEC CORP
    • SATO IKUROIWATA RYUICHI
    • H01Q3/20H01Q5/00H01Q19/18H01Q19/19H01Q3/18
    • Disclosed is a high performance dual-band antenna system which, utilizing a frequency selective reflector surface, renders the antenna elevation and azimuth angles variable with a simple construction and without imposing any limitation on the settings of communication equipment and, also, insures desirable cross polarization performance and a minimum of loss. The system comprises a dual reflector antenna rotatable around elevation and azimuth axes, having a main reflector and a subreflector. First and second horns radiate first and second electromagnetic waves of first and second frequency bands, respectively. A beam waveguide comprises first and second plane mirrors and first and second concave mirrors, for guiding the first and second electromagnetic waves to the dual reflector antenna by way of the first plane mirror. The first and second concave mirrors, the second plane mirror and the beam waveguide are rotatable around the elevation and azimuth axes. A frequency selective reflector surface is provided separately from the beam waveguide means for passing the first electromagnetic wave and reflecting the second electromagnetic wave to feed them to the first plane mirror. The first and second electromagnetic waves radiated from the first and second horns are directly fed to the frequency selective reflector surface and both the first and second electromagnetic waves provided from the frequency selective reflector surface are fed to the first plane mirror by way of third and fourth concave mirrors.