摘要:
文中通过下层条带型介质贴片耦合激励上层1×2 的条带型介质贴片,结合末端加载X 型枝节的微带馈线,构成1×2 的介质贴片滤波天线阵列。下层单个条带形介质贴片的TMδ1 模能够耦合激励两个上层条带形介质贴片的TMδ1 模,并提供大地反射路径上的额外相位,以便减少两层介质间的空气层厚度。辐射体形状皆为条带形,因此天线结构紧凑。同时下层条带形介质贴片起到功率分配作用,进一步减小了天线阵列复杂度。通过在馈线末端加载X 型枝节可以产生额外的反射零点以及工作频带高端边缘处的辐射零点,天线阵列带宽与频率选择性得到有效改善。测试结果显示,天线阵列辐射体尺寸仅有0. 044λ20,整体剖面为0. 15λ0,相对带宽为24. 6%。由此可见,该天线阵列在保持结构紧凑的同时实现了较宽的带宽。
Abstract:
This paper proposes a 1×2 dielectric patch filtering antenna array by utilizing the strip-shaped dielectric patch on the bottom layer to excite the 1×2 strip-shaped dielectric patches on the top layer, combined with the microstrip feedline that end loaded with X-shaped branches. Both the lower and upper strip-shaped dielectric patches operate on TMδ1 mode. The lower stripshaped dielectric patch can reduce the phase requirement of the upper one so that the total thickness can be reduced. The stripshaped resonator can compact the size of the radiator, and the lower strip-shaped dense dielectric patch plays a role of power distribution, which furtherly reduced the antenna array. By loading X-shaped open circuit stubs at the end of the feed line, additional reflection zero point and radiation null at the high-end edge of the operating frequency band can be generated, which can improve the bandwidth and frequency selectivity. The measured results show that the area of the antenna array radiator is only 0. 044λ20, the overall profile is 0. 15λ0, and the relative bandwidth is 24. 6%. It can be seen that the antenna array achieves wide bandwidth while maintaining compact radiator size.
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