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现在广泛使用的双频道天线或宽频道天线都是单方向的,它们要求两个不同频道的电视台都在同一个方向。否则,特别是相差90°方位时,就不适用了。下面介绍的利用定向耦合器和高频变压器做成的双频道天线则都能适合位于任意方位上的两个不同频道电视台信号的接收。一、定向耦合器定向耦合器在天线馈电及天线测量技术中有很多用途。定向耦合器可用扁馈线来做,它被称做扁馈线式定向耦合器。其特点是制作简单,使用方便。这种定向耦合器可用来实现两副天线信号的相加,从而做成双频道天线或宽频道天线。
Now widely used dual-channel antenna or wide-band antennas are unidirectional, they require two different channels of television stations in the same direction. Otherwise, especially if the difference is 90 °, it does not apply. The following two-channel antenna made of directional coupler and high-frequency transformer are suitable for receiving signals of two different channel television stations located in any position. First, the directional coupler Directional coupler in the antenna feed and antenna measurement technology has many uses. Directional coupler can be used to do the flat feeder, which is called flat feeder linear directional coupler. It is characterized by simple production, easy to use. This directional coupler can be used to achieve the addition of two antenna signals to make dual-channel antennas or wide-band antennas.