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一、序言在天线中,由于使用目的不同,所以对频段的划分也各不相同。在卫星通信、散射通信和接力通信等微波通信中,工作频段可以是一段一段的。它们中间有一个频段空隙,频段空隙可以为零。一个频段的高频对低频的比值(相对频宽)约为1.1到1.2比1,要求不但在一个频段内性能应该差别不多,而且各个频段之性能也不能相差太悬殊。如果工作频段是一个连续段,就叫单频段;如果是两个被频段空隙隔开的连续段,就叫双频段;如果是三个或三
First, the preamble In the antenna, due to the use of different purposes, so the band is also divided into different. In microwave communications such as satellite communications, scatter communications and relay communications, the working frequency band can be a period of time. There is a band gap between them, the band gap can be zero. The ratio of high frequency to low frequency (relative bandwidth) of a frequency band is about 1.1 to 1.2 to 1. It is required that the performance should not be much different in one frequency band, and the performance of each frequency band should not be too far apart. If the working frequency band is a continuous segment, it is called a single frequency band; if it is two consecutive segments separated by a frequency band gap, it is called dual band; if it is three or three