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紧凑型双馈圆极化微带天线阵列在E面和H面存在严重互耦,会导致天线阵列的整体性能显著下降。为此,设计了二单元圆极化微带天线阵列,建立了参数化HFSS模型,对天线单元间距、辐射基片切向方向边缘效应对E面和H面互耦影响进行了仿真和分析,结果表明存在临界单元间距值。小于该值时,H面的互耦比E面的严重,反之H面的互耦会随着间距加大而显著下降;对于E面互耦,辐射基片切向方向的介质边缘存在对应最小E面互耦的最佳尺寸,但对于H面互耦,介质边缘效应并不显著。进一步设计了具有典型参数值的实物样品,测试结果验证了上述情况,并表明:介质边缘效应只能改善E面互耦,但对H面互耦的改善需要采用其它方法。
The compact doubly fed circularly polarized microstrip antenna array has serious mutual coupling between E-plane and H-plane, resulting in a significant decrease in the overall performance of the antenna array. For this purpose, a two-unit circularly polarized microstrip antenna array is designed and a parametric HFSS model is established. The mutual coupling between the antenna element spacing and the tangential edge effect of the radiation substrate on the E-plane and the H-plane is simulated and analyzed. The results show that there is a critical cell spacing value. When the value is smaller than the value, the mutual coupling of H surface is more serious than that of E surface. On the contrary, the mutual coupling of H surface decreases significantly with the increase of spacing. For the mutual coupling of surface E and the edge of the medium in the tangential direction of radiation substrate, E surface mutual coupling of the best size, but for the H-surface mutual coupling, the media edge effect is not significant. The physical samples with typical parameter values are further designed. The test results verify the above, and show that the medium edge effect can only improve the mutual coupling of E surface. However, other methods are needed to improve the mutual coupling of H surface.