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本文介绍了由90°角反射体、喇叭、同轴心线、两个或三个铁氧体棒以及磁化每一铁氧体的电磁体组成的天线的测量性能。文中详细叙述了带有两个铁氧体棒的天线。尽管天线的结构和铁氧体磁化都是对称的,但由于铁氧体的各向异性,使得铁氧体的加载产生了非对称功率方向图。此外,通过铁氧体加载,可以获得非常尖的天线主瓣和比较高的增益。通过反转加到铁氧体上的直流磁场,主瓣可以转移到天线对称面的映射方向上,也就是说,实现了H平面上的电子波瓣转换。这说明,通过把适当的磁场加到铁氧体上,三个铁氧体棒加载的天线将使主瓣的连续扫描成为可能。用电子方法改变电磁体的电流,也就是改变铁氧体的张量磁导率,可以转换这类天线的主瓣方向。但对各向同性介质组成的这类天线,其可逆性对于这种天线来说是不存在的。当发射和接收使用相同的直流磁场时,接收功率方向图与对称面映射的发射方向图一致。因此,这种天线使我们能从一个方向接收,并且同时能向对称面的映射方向发射。
This article describes the measurement performance of an antenna consisting of a 90 ° angle reflector, a horn, a coaxial line, two or three ferrite bars, and an electromagnet magnetizing each ferrite. The article describes in detail the antenna with two ferrite rods. Although the structure of the antenna and the ferrite magnetization are symmetrical, the ferrite load results in an asymmetric power pattern due to the anisotropy of the ferrite. In addition, a very sharp antenna main lobe and a relatively high gain can be obtained by ferrite loading. By reversing the DC magnetic field applied to the ferrite, the main lobe can be shifted in the mapping direction of the antenna’s symmetry plane, that is, the electronic lobe transition on the H-plane is achieved. This shows that by applying an appropriate magnetic field to the ferrite, the three ferrite rod loaded antennas will make it possible for a continuous scan of the main lobe. Electronically changing the current of the electromagnet, that is, changing the tensor permeability of the ferrite, can translate the main lobe direction of such an antenna. However, the reversibility of such an antenna composed of isotropic media does not exist for this type of antenna. When transmitting and receiving using the same DC magnetic field, the receive power pattern is consistent with the emission pattern of the symmetry plane map. Therefore, this antenna allows us to receive from one direction and at the same time to the direction of symmetry plane mapping.