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本文研究了控制微带天线的工作频率和极化的方法。这种控制是通过把若干短路棒放到天线边界内的一些适当位置上实现的。借助于改变短路棒的数量和位置,可以把工作频率调谐在1.5～1范围内,而且可把极化从水平极化改变成垂直极化、右旋圆极化或左旋圆极化。以有这些变化是在不需要显著改变天线的输入阻抗或天线的辐射方向图,不需要提高外部微波馈线网络的复杂性的情况下得到的。使用一些微波开关二极管作为短路捧,可以控制频率和极化。具有两个馈源和用两个相互垂直的极化同时工作的天线已被制成,并且能在线性极化和圆极化之间进行转换。用频率捷变微带单元,已制成了一个薄的频率扫描天线阵。
This article studies how to control the operating frequency and polarization of the microstrip antenna. This control is achieved by placing a number of shorting bars in place on the antenna boundary. By changing the number and position of shorting bars, the operating frequency can be tuned in the 1.5-1 range and the polarization can be changed from horizontal to vertical, right-handed or left-handed circularly polarized. These changes are made without the need to significantly change the antenna’s input impedance or the radiation pattern of the antenna without increasing the complexity of the external microwave feeder network. Using some microwave switching diodes as a short circuit, you can control the frequency and polarization. Antennas with two feeds and operating simultaneously with two mutually perpendicular polarizations have been made and can be switched between linear and circular polarizations. With a frequency agile microstrip unit, a thin frequency sweep antenna array has been made.