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    • 7. 发明专利
    • Parabolic antenna
    • 抛物线天线
    • JPS61133705A
    • 1986-06-21
    • JP25504284
    • 1984-12-04
    • Yokohama Rubber Co Ltd:The
    • TASHIRO KEIICHI
    • H01Q15/16H01Q17/00H01Q19/02H01Q19/12
    • H01Q19/021
    • PURPOSE:To sharpen more a received picture pattern and to prevent surely generation of ghost or the like by fitting a radio wave shield in parallel with irradiated direction of a radio wave to the peripheral of a parabolic antenna main body. CONSTITUTION:The radio wave shield body 20 consists of a cylindrical main body 21 made of an FRP, a radio wave absorbing layer 22 provided to cover the inner circumference of the main body 21 and a radio wave shield layer 23 provided to cover the peripheral face of the main body 21. The inner diameter of the main body 21 is made nearly coincident with the inner diameter of a peripheral part 10a of the parabolic antenna main body 10 and the thickness is a thickness offering the required strength to the said radio wave shield 20. Thus, the electromagnetic wave from a communication satellite is reflected in the surrounding buildings or the like and a reflected wave R1 is about to invade into the parabolic antenna main body 10, but it is reflected or grounded by the radio wave shield body 20 or absorbed and attenuated and the invasion into the parabolic antenna main body 10 is shut off.
    • 目的:通过将无线电波屏蔽与无线电波的辐射方向并联安装到抛物面天线主体的周边,来增加更多的接收到的图像图案并防止确实产生重影等。 构成:无线电波屏蔽体20由FRP制成的筒状主体21,覆盖主体21的内周的无线电波吸收层22和覆盖主体21的周面的电波屏蔽层23构成 主体21的内径与抛物面天线主体10的周边部10a的内径大致一致,厚度为向所述无线电波屏蔽提供所需强度的厚度 因此,来自通信卫星的电磁波被反射在周围的建筑物等中,并且反射波R1即将侵入到抛物面天线主体10中,但是它被无线电波屏蔽体20反射或接地 或被吸收和衰减,并且入侵到抛物面天线主体10中被切断。