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本文所述加载圆环天线是VHF全频道室内电视接收天线,其性能、价格比较优于羊角等其他室内电视天线。该天线在VHF全频道,驻波系数小于2,水平面和垂直面方向图均近似呈现心脏形,因而特别适合在强信号区用来消除后向反射波造成的电视重影干扰。文中叙述了加载圆环天线的基本理论,推导了它的输入阻抗公式,计算了它的方向图和增益,实测值和理论值较吻合。
The loading ring antenna described in this article is a VHF all-channel indoor TV receiver antenna, its performance, price is better than other domestic TV antenna such as claw. The antenna in the VHF channel, the standing wave coefficient is less than 2, the horizontal plane and the vertical plane are nearly the heart-shaped pattern, which is particularly suitable for the strong signal area to eliminate the ghosting caused by TV ghosting interference. The paper introduces the basic theory of circular antenna, deduces its input impedance formula, calculates its pattern and gain, and the measured and theoretical values are in good agreement.