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双圆环电视接收天线(以下简称双环天线)由两副圆环天线并接构成。其中,每一副圆环天线的周长约等于1个波长。为了改善天线的性能,这种天线在实际应用时都带有金属反射网(或金属反射板),如图1所示。这种天线与单圆环天线相比,其特点是增益高,定向性好,抗后向干扰能力强。因此,获得了越来越广泛的应用。双环天线之所以具有上述特点,是与配置金属反射网(板)有密切关系。下面就金属反射网的作用与安装、天线的馈接方法及天线的应用作一介绍。
Double-ring TV receiving antenna (hereinafter referred to as double-loop antenna) by the two ring antenna and then constitute. The circumference of each sub-ring antenna is approximately equal to one wavelength. In order to improve the performance of the antenna, the antenna with a practical application of metal reflective mesh (or metal reflector), shown in Figure 1. This antenna compared with the single-ring antenna, which is characterized by high gain, good directivity, strong anti-interference ability. Therefore, more and more applications have been obtained. The reason why the double loop antenna has the above characteristics is closely related to the configuration of the metal reflection net (board). The following is the role of metal reflection and installation of the antenna, antenna feeding method and antenna applications for an introduction.