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讨论了一种低折射率人工电磁材料应用于天线阵设计,在口径面积相同的情况下,获得了比传统天线阵更高的方向性。这种阵列天线有如下一些特征:阵元数量显著减少,阵元间距远大于一个波长,馈电网络简单。人工电磁材料由两层周期性的正方形金属网格构成,置于阵元的上方。结果表明:一个由同轴馈电的2×2微带贴片集成人工电磁材料覆层构成的阵列天线,具有26d B以上的高方向性,优于传统天线。相同口径面积的情况下,一个4×4阵元集成人工电磁材料覆层的天线阵结构,其增益与一个传统的16×16阵元的天线阵结构相当。前者显而易见地具有更简单的馈电网络和较高的天线口径效率。本文提出的天线阵,在高增益天线系统中具有较高的应用价值。
The application of a low refractive index artificial electromagnetic material to the antenna array design is discussed. In the case of the same aperture area, a higher directionality than the traditional antenna array is obtained. The array antenna has the following features: a significant reduction in the number of array elements, an array element spacing much greater than one wavelength, and a simple feed network. Artificial electromagnetic material consists of two layers of periodic square metal grid, placed above the array element. The results show that an array antenna composed of a 2 × 2 microstrip patch with a coaxial feed integrated with artificial electromagnetic material cladding has a high directivity of more than 26d B, which is better than the traditional antenna. With the same aperture area, the antenna array structure with a 4 × 4 array integrated artificial electromagnetic material cladding has the same gain as the structure of a traditional 16 × 16 array antenna array. The former obviously has a simpler feed network and a higher antenna aperture efficiency. The antenna array proposed in this paper has high application value in high gain antenna system.